Putnam Target Date Funds N-CSR 27 Sep 24 Certified annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
	Jul. 31, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Putnam Target Date Funds
Entity Central Index Key	0001295293
Entity Investment Company Type	N-1A
Document Period End Date	Jul. 31, 2024

Shareholder Report

Shareholder Report	12 Months Ended
	Jul. 31, 2024 USD ($) $ / shares
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Putnam Target Date Funds
Entity Central Index Key	0001295293
Entity Investment Company Type	N-1A
Document Period End Date	Jul. 31, 2024
Class A
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2065 Fund
Class Name	Class A
Trading Symbol	PCJQX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2065 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class A 1 $31 0.28%	[1],[2]
Expenses Paid, Amount	$ 31	[1]
Expense Ratio, Percent	0.28%	[1]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class A shares of Putnam Sustainable Retirement 2065 Fund returned 22.28%. The Fund compares its performance to the S&P Target Date To 2065+ Index, which returned 15.83% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying Fund, Putnam Sustainable Future ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year Since Inception (1/4/2021) Class A 22.28 9.82 Class A (with sales charge) 15.25 8.02 Russell 3000 Index 21.07 11.54 Bloomberg U.S. Aggregate Index 5.10 -2.35 S&P Target Date To 2065+ Index 1 15.83 8.31 S&P 500 Index 22.15 13.08	[3]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 952,206
Holdings Count | $ / shares	8	[4]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	45%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $952,206 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 45%	[4]
Holdings [Text Block]		[5]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class C
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2065 Fund
Class Name	Class C
Trading Symbol	PCJRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2065 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class C 1 $114 1.03%	[6],[7]
Expenses Paid, Amount	$ 114	[6]
Expense Ratio, Percent	1.03%	[6]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class C shares of Putnam Sustainable Retirement 2065 Fund returned 21.39%. The Fund compares its performance to the S&P Target Date To 2065+ Index, which returned 15.83% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying Fund, Putnam Sustainable Future ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year Since Inception (1/4/2021) Class C 21.39 9.02 Class C (with sales charge) 20.39 9.02 Russell 3000 Index 21.07 11.54 Bloomberg U.S. Aggregate Index 5.10 -2.35 S&P Target Date To 2065+ Index 1 15.83 8.31 S&P 500 Index 22.15 13.08	[8]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 952,206
Holdings Count | $ / shares	8	[9]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	45%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $952,206 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 45%	[9]
Holdings [Text Block]		[10]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2065 Fund
Class Name	Class R
Trading Symbol	PCJUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2065 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R 1 $75 0.68%	[11],[12]
Expenses Paid, Amount	$ 75	[11]
Expense Ratio, Percent	0.68%	[11]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R shares of Putnam Sustainable Retirement 2065 Fund returned 21.78%. The Fund compares its performance to the S&P Target Date To 2065+ Index, which returned 15.83% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying Fund, Putnam Sustainable Future ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year Since Inception (1/4/2021) Class R 21.78 9.38 Russell 3000 Index 21.07 11.54 Bloomberg U.S. Aggregate Index 5.10 -2.35 S&P Target Date To 2065+ Index 1 15.83 8.31 S&P 500 Index 22.15 13.08	[13]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 952,206
Holdings Count | $ / shares	8	[14]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	45%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $952,206 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 45%	[14]
Holdings [Text Block]		[15]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R3
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2065 Fund
Class Name	Class R3
Trading Symbol	PCJVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2065 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R3 1 $48 0.43%	[16],[17]
Expenses Paid, Amount	$ 48	[16]
Expense Ratio, Percent	0.43%	[16]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R3 shares of Putnam Sustainable Retirement 2065 Fund returned 22.10%. The Fund compares its performance to the S&P Target Date To 2065+ Index, which returned 15.83% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying Fund, Putnam Sustainable Future ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year Since Inception (1/4/2021) Class R3 22.10 9.67 Russell 3000 Index 21.07 11.54 Bloomberg U.S. Aggregate Index 5.10 -2.35 S&P Target Date To 2065+ Index 1 15.83 8.31 S&P 500 Index 22.15 13.08	[18]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 952,206
Holdings Count | $ / shares	8	[19]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	45%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $952,206 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 45%	[19]
Holdings [Text Block]		[20]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R4
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2065 Fund
Class Name	Class R4
Trading Symbol	PCJWX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2065 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R4 1 $20 0.18%	[21],[22]
Expenses Paid, Amount	$ 20	[21]
Expense Ratio, Percent	0.18%	[21]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R4 shares of Putnam Sustainable Retirement 2065 Fund returned 22.46%. The Fund compares its performance to the S&P Target Date To 2065+ Index, which returned 15.83% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying Fund, Putnam Sustainable Future ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year Since Inception (1/4/2021) Class R4 22.46 9.94 Russell 3000 Index 21.07 11.54 Bloomberg U.S. Aggregate Index 5.10 -2.35 S&P Target Date To 2065+ Index 1 15.83 8.31 S&P 500 Index 22.15 13.08	[23]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 952,206
Holdings Count | $ / shares	8	[24]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	45%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $952,206 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 45%	[24]
Holdings [Text Block]		[25]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R5
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2065 Fund
Class Name	Class R5
Trading Symbol	PCJIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2065 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R5 1 $3 0.03%	[26],[27]
Expenses Paid, Amount	$ 3	[26]
Expense Ratio, Percent	0.03%	[26]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R5 shares of Putnam Sustainable Retirement 2065 Fund returned 22.59%. The Fund compares its performance to the S&P Target Date To 2065+ Index, which returned 15.83% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying Fund, Putnam Sustainable Future ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year Since Inception (1/4/2021) Class R5 22.59 10.10 Russell 3000 Index 21.07 11.54 Bloomberg U.S. Aggregate Index 5.10 -2.35 S&P Target Date To 2065+ Index 1 15.83 8.31 S&P 500 Index 22.15 13.08	[28]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 952,206
Holdings Count | $ / shares	8	[29]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	45%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $952,206 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 45%	[29]
Holdings [Text Block]		[30]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R6
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2065 Fund
Class Name	Class R6
Trading Symbol	PCJYX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2065 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R6 1 -$8 -0.07%	[31],[32]
Expenses Paid, Amount	$ (8)	[31]
Expense Ratio, Percent	(0.07%)	[31]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R6 shares of Putnam Sustainable Retirement 2065 Fund returned 22.81%. The Fund compares its performance to the S&P Target Date To 2065+ Index, which returned 15.83% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying Fund, Putnam Sustainable Future ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year Since Inception (1/4/2021) Class R6 22.81 10.22 Russell 3000 Index 21.07 11.54 Bloomberg U.S. Aggregate Index 5.10 -2.35 S&P Target Date To 2065+ Index 1 15.83 8.31 S&P 500 Index 22.15 13.08	[33]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 952,206
Holdings Count | $ / shares	8	[34]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	45%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $952,206 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 45%	[34]
Holdings [Text Block]		[35]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class Y
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2065 Fund
Class Name	Class Y
Trading Symbol	PCJSX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2065 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class Y 1 $3 0.03%	[36],[37]
Expenses Paid, Amount	$ 3	[36]
Expense Ratio, Percent	0.03%	[36]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class Y shares of Putnam Sustainable Retirement 2065 Fund returned 22.58%. The Fund compares its performance to the S&P Target Date To 2065+ Index, which returned 15.83% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying Fund, Putnam Sustainable Future ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year Since Inception (1/4/2021) Class Y 22.58 10.10 Russell 3000 Index 21.07 11.54 Bloomberg U.S. Aggregate Index 5.10 -2.35 S&P Target Date To 2065+ Index 1 15.83 8.31 S&P 500 Index 22.15 13.08	[38]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 952,206
Holdings Count | $ / shares	8	[39]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	45%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $952,206 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 45%	[39]
Holdings [Text Block]		[40]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class A
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2060 Fund
Class Name	Class A
Trading Symbol	PRTFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2060 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class A 1 $32 0.29%	[41],[42]
Expenses Paid, Amount	$ 32	[41]
Expense Ratio, Percent	0.29%	[41]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class A shares of Putnam Sustainable Retirement 2060 Fund returned 21.73%. The Fund compares its performance to the S&P Target Date To 2060 Index, which returned 15.45% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year Since Inception (11/30/2015) Class A 21.73 10.90 9.40 Class A (with sales charge) 14.73 9.60 8.66 Russell 3000 Index 21.07 14.23 13.38 Bloomberg U.S. Aggregate Index 5.10 0.19 1.50 S&P Target Date To 2060 Index 1 15.45 10.24 9.71 S&P 500 Index 22.15 15.00 13.96	[43]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 40,244,317
Holdings Count | $ / shares	8	[44]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $40,244,317 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[44]
Holdings [Text Block]		[45]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class B
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2060 Fund
Class Name	Class B
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2060 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class B 1 $115 1.04%	[46],[47]
Expenses Paid, Amount	$ 115	[46]
Expense Ratio, Percent	1.04%	[46]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class B shares of Putnam Sustainable Retirement 2060 Fund returned 20.84%. The Fund compares its performance to the S&P Target Date To 2060 Index, which returned 15.45% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year Since Inception (11/30/2015) Class B 20.84 10.08 8.66 Class B (with sales charge) 15.84 9.81 8.66 Russell 3000 Index 21.07 14.23 13.38 Bloomberg U.S. Aggregate Index 5.10 0.19 1.50 S&P Target Date To 2060 Index 1 15.45 10.24 9.71 S&P 500 Index 22.15 15.00 13.96	[48]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 40,244,317
Holdings Count | $ / shares	8	[49]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $40,244,317 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[49]
Holdings [Text Block]		[50]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. Effective September 5, 2024 (the “Conversion Date”), class B shares of the Fund acquired prior to the Conversion Date will convert automatically to class A shares. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at   https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class C
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2060 Fund
Class Name	Class C
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2060 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class C 1 $115 1.04%	[51],[52]
Expenses Paid, Amount	$ 115	[51]
Expense Ratio, Percent	1.04%	[51]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class C shares of Putnam Sustainable Retirement 2060 Fund returned 20.93%. The Fund compares its performance to the S&P Target Date To 2060 Index, which returned 15.45% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year Since Inception (11/30/2015) Class C 20.93 10.10 8.65 Class C (with sales charge) 19.93 10.10 8.65 Russell 3000 Index 21.07 14.23 13.38 Bloomberg U.S. Aggregate Index 5.10 0.19 1.50 S&P Target Date To 2060 Index 1 15.45 10.24 9.71 S&P 500 Index 22.15 15.00 13.96	[53]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 40,244,317
Holdings Count | $ / shares	8	[54]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $40,244,317 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[54]
Holdings [Text Block]		[55]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2060 Fund
Class Name	Class R
Trading Symbol	PRTRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2060 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R 1 $76 0.69%	[56],[57]
Expenses Paid, Amount	$ 76	[56]
Expense Ratio, Percent	0.69%	[56]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R shares of Putnam Sustainable Retirement 2060 Fund returned 21.33%. The Fund compares its performance to the S&P Target Date To 2060 Index, which returned 15.45% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year Since Inception (11/30/2015) Class R 21.33 10.51 9.07 Russell 3000 Index 21.07 14.23 13.38 Bloomberg U.S. Aggregate Index 5.10 0.19 1.50 S&P Target Date To 2060 Index 1 15.45 10.24 9.71 S&P 500 Index 22.15 15.00 13.96	[58]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 40,244,317
Holdings Count | $ / shares	8	[59]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $40,244,317 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[59]
Holdings [Text Block]		[60]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R3
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2060 Fund
Class Name	Class R3
Trading Symbol	PAEVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2060 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R3 1 $49 0.44%	[61],[62]
Expenses Paid, Amount	$ 49	[61]
Expense Ratio, Percent	0.44%	[61]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R3 shares of Putnam Sustainable Retirement 2060 Fund returned 21.59%. The Fund compares its performance to the S&P Target Date To 2060 Index, which returned 15.45% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year Since Inception (11/30/2015) Class R3 21.59 10.78 9.30 Russell 3000 Index 21.07 14.23 13.38 Bloomberg U.S. Aggregate Index 5.10 0.19 1.50 S&P Target Date To 2060 Index 1 15.45 10.24 9.71 S&P 500 Index 22.15 15.00 13.96	[63]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 40,244,317
Holdings Count | $ / shares	8	[64]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $40,244,317 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[64]
Holdings [Text Block]		[65]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R4
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2060 Fund
Class Name	Class R4
Trading Symbol	PAEUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2060 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R4 1 $21 0.19%	[66],[67]
Expenses Paid, Amount	$ 21	[66]
Expense Ratio, Percent	0.19%	[66]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R4 shares of Putnam Sustainable Retirement 2060 Fund returned 21.92%. The Fund compares its performance to the S&P Target Date To 2060 Index, which returned 15.45% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year Since Inception (11/30/2015) Class R4 21.92 11.07 9.57 Russell 3000 Index 21.07 14.23 13.38 Bloomberg U.S. Aggregate Index 5.10 0.19 1.50 S&P Target Date To 2060 Index 1 15.45 10.24 9.71 S&P 500 Index 22.15 15.00 13.96	[68]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 40,244,317
Holdings Count | $ / shares	8	[69]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $40,244,317 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[69]
Holdings [Text Block]		[70]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R5
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2060 Fund
Class Name	Class R5
Trading Symbol	PAEWX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2060 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R5 1 $4 0.04%	[71],[72]
Expenses Paid, Amount	$ 4	[71]
Expense Ratio, Percent	0.04%	[71]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R5 shares of Putnam Sustainable Retirement 2060 Fund returned 22.08%. The Fund compares its performance to the S&P Target Date To 2060 Index, which returned 15.45% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year Since Inception (11/30/2015) Class R5 22.08 11.22 9.72 Russell 3000 Index 21.07 14.23 13.38 Bloomberg U.S. Aggregate Index 5.10 0.19 1.50 S&P Target Date To 2060 Index 1 15.45 10.24 9.71 S&P 500 Index 22.15 15.00 13.96	[73]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 40,244,317
Holdings Count | $ / shares	8	[74]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $40,244,317 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[74]
Holdings [Text Block]		[75]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R6
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2060 Fund
Class Name	Class R6
Trading Symbol	PEFGX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2060 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R6 1 -$7 -0.06%	[76],[77]
Expenses Paid, Amount	$ (7)	[76]
Expense Ratio, Percent	(0.06%)	[76]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R6 shares of Putnam Sustainable Retirement 2060 Fund returned 22.17%. The Fund compares its performance to the S&P Target Date To 2060 Index, which returned 15.45% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year Since Inception (11/30/2015) Class R6 22.17 11.30 9.77 Russell 3000 Index 21.07 14.23 13.38 Bloomberg U.S. Aggregate Index 5.10 0.19 1.50 S&P Target Date To 2060 Index 1 15.45 10.24 9.71 S&P 500 Index 22.15 15.00 13.96	[78]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 40,244,317
Holdings Count | $ / shares	8	[79]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $40,244,317 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[79]
Holdings [Text Block]		[80]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class Y
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2060 Fund
Class Name	Class Y
Trading Symbol	PRTYX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2060 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class Y 1 $4 0.04%	[81],[82]
Expenses Paid, Amount	$ 4	[81]
Expense Ratio, Percent	0.04%	[81]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class Y shares of Putnam Sustainable Retirement 2060 Fund returned 22.19%. The Fund compares its performance to the S&P Target Date To 2060 Index, which returned 15.45% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year Since Inception (11/30/2015) Class Y 22.19 11.21 9.69 Russell 3000 Index 21.07 14.23 13.38 Bloomberg U.S. Aggregate Index 5.10 0.19 1.50 S&P Target Date To 2060 Index 1 15.45 10.24 9.71 S&P 500 Index 22.15 15.00 13.96	[83]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 40,244,317
Holdings Count | $ / shares	8	[84]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $40,244,317 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[84]
Holdings [Text Block]		[85]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class A
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2055 Fund
Class Name	Class A
Trading Symbol	PRRFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2055 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class A 1 $32 0.29%	[86],[87]
Expenses Paid, Amount	$ 32	[86]
Expense Ratio, Percent	0.29%	[86]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class A shares of Putnam Sustainable Retirement 2055 Fund returned 21.09%. The Fund compares its performance to the S&P Target Date To 2055 Index, which returned 15.41% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class A 21.09 10.42 8.56 Class A (with sales charge) 14.12 9.12 7.92 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2055 Index 1 15.41 10.01 8.44 S&P 500 Index 22.15 15.00 13.15	[88]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 100,153,986
Holdings Count | $ / shares	8	[89]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	13%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $100,153,986 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 13%	[89]
Holdings [Text Block]		[90]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class B
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2055 Fund
Class Name	Class B
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2055 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class B 1 $114 1.04%	[91],[92]
Expenses Paid, Amount	$ 114	[91]
Expense Ratio, Percent	1.04%	[91]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class B shares of Putnam Sustainable Retirement 2055 Fund returned 20.15%. The Fund compares its performance to the S&P Target Date To 2055 Index, which returned 15.41% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class B 20.15 9.59 7.93 Class B (with sales charge) 15.15 9.31 7.93 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2055 Index 1 15.41 10.01 8.44 S&P 500 Index 22.15 15.00 13.15	[93]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 100,153,986
Holdings Count | $ / shares	8	[94]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	13%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $100,153,986 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 13%	[94]
Holdings [Text Block]		[95]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. Effective September 5, 2024 (the “Conversion Date”), class B shares of the Fund acquired prior to the Conversion Date will convert automatically to class A shares. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class C
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2055 Fund
Class Name	Class C
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2055 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class C 1 $114 1.04%	[96],[97]
Expenses Paid, Amount	$ 114	[96]
Expense Ratio, Percent	1.04%	[96]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class C shares of Putnam Sustainable Retirement 2055 Fund returned 20.12%. The Fund compares its performance to the S&P Target Date To 2055 Index, which returned 15.41% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class C 20.12 9.58 7.92 Class C (with sales charge) 19.12 9.58 7.92 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2055 Index 1 15.41 10.01 8.44 S&P 500 Index 22.15 15.00 13.15	[98]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 100,153,986
Holdings Count | $ / shares	8	[99]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	13%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $100,153,986 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 13%	[99]
Holdings [Text Block]		[100]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2055 Fund
Class Name	Class R
Trading Symbol	PRRVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2055 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R 1 $76 0.69%	[101],[102]
Expenses Paid, Amount	$ 76	[101]
Expense Ratio, Percent	0.69%	[101]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R shares of Putnam Sustainable Retirement 2055 Fund returned 20.54%. The Fund compares its performance to the S&P Target Date To 2055 Index, which returned 15.41% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R 20.54 10.03 8.24 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2055 Index 1 15.41 10.01 8.44 S&P 500 Index 22.15 15.00 13.15	[103]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 100,153,986
Holdings Count | $ / shares	8	[104]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	13%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $100,153,986 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 13%	[104]
Holdings [Text Block]		[105]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R3
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2055 Fund
Class Name	Class R3
Trading Symbol	PAEOX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2055 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R3 1 $49 0.44%	[106],[107]
Expenses Paid, Amount	$ 49	[106]
Expense Ratio, Percent	0.44%	[106]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R3 shares of Putnam Sustainable Retirement 2055 Fund returned 20.81%. The Fund compares its performance to the S&P Target Date To 2055 Index, which returned 15.41% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R3 20.81 10.29 8.48 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2055 Index 1 15.41 10.01 8.44 S&P 500 Index 22.15 15.00 13.15	[108]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 100,153,986
Holdings Count | $ / shares	8	[109]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	13%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $100,153,986 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 13%	[109]
Holdings [Text Block]		[110]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R4
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2055 Fund
Class Name	Class R4
Trading Symbol	PAEPX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2055 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R4 1 $21 0.19%	[111],[112]
Expenses Paid, Amount	$ 21	[111]
Expense Ratio, Percent	0.19%	[111]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R4 shares of Putnam Sustainable Retirement 2055 Fund returned 21.15%. The Fund compares its performance to the S&P Target Date To 2055 Index, which returned 15.41% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R4 21.15 10.56 8.75 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2055 Index 1 15.41 10.01 8.44 S&P 500 Index 22.15 15.00 13.15	[113]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 100,153,986
Holdings Count | $ / shares	8	[114]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	13%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $100,153,986 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 13%	[114]
Holdings [Text Block]		[115]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R5
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2055 Fund
Class Name	Class R5
Trading Symbol	PAESX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2055 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R5 1 $4 0.04%	[116],[117]
Expenses Paid, Amount	$ 4	[116]
Expense Ratio, Percent	0.04%	[116]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R5 shares of Putnam Sustainable Retirement 2055 Fund returned 21.36%. The Fund compares its performance to the S&P Target Date To 2055 Index, which returned 15.41% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R5 21.36 10.72 8.90 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2055 Index 1 15.41 10.01 8.44 S&P 500 Index 22.15 15.00 13.15	[118]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 100,153,986
Holdings Count | $ / shares	8	[119]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	13%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $100,153,986 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 13%	[119]
Holdings [Text Block]		[120]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R6
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2055 Fund
Class Name	Class R6
Trading Symbol	PREVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2055 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R6 1 -$7 -0.06%	[121],[122]
Expenses Paid, Amount	$ (7)	[121]
Expense Ratio, Percent	(0.06%)	[121]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R6 shares of Putnam Sustainable Retirement 2055 Fund returned 21.45%. The Fund compares its performance to the S&P Target Date To 2055 Index, which returned 15.41% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R6 21.45 10.80 8.94 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2055 Index 1 15.41 10.01 8.44 S&P 500 Index 22.15 15.00 13.15	[123]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 100,153,986
Holdings Count | $ / shares	8	[124]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	13%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $100,153,986 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 13%	[124]
Holdings [Text Block]		[125]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class Y
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2055 Fund
Class Name	Class Y
Trading Symbol	PRTLX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2055 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class Y 1 $4 0.04%	[126],[127]
Expenses Paid, Amount	$ 4	[126]
Expense Ratio, Percent	0.04%	[126]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class Y shares of Putnam Sustainable Retirement 2055 Fund returned 21.31%. The Fund compares its performance to the S&P Target Date To 2055 Index, which returned 15.41% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class Y 21.31 10.69 8.84 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2055 Index 1 15.41 10.01 8.44 S&P 500 Index 22.15 15.00 13.15	[128]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 100,153,986
Holdings Count | $ / shares	8	[129]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	13%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $100,153,986 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 13%	[129]
Holdings [Text Block]		[130]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class A
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2050 Fund
Class Name	Class A
Trading Symbol	PRRJX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2050 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class A 1 $34 0.31%	[131],[132]
Expenses Paid, Amount	$ 34	[131]
Expense Ratio, Percent	0.31%	[131]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class A shares of Putnam Sustainable Retirement 2050 Fund returned 20.28%. The Fund compares its performance to the S&P Target Date to 2050 Index, which returned 15.46% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date to 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date to 2050 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying fund, Putnam ESG Ultra Short ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class A 20.28 9.89 8.26 Class A (with sales charge) 13.36 8.60 7.62 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2050 Index 1 15.46 10.00 8.39 S&P 500 Index 22.15 15.00 13.15	[133]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 167,933,237
Holdings Count | $ / shares	8	[134]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $167,933,237 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 17%	[134]
Holdings [Text Block]		[135]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class B
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2050 Fund
Class Name	Class B
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2050 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class B 1 $116 1.06%	[136],[137]
Expenses Paid, Amount	$ 116	[136]
Expense Ratio, Percent	1.06%	[136]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class B shares of Putnam Sustainable Retirement 2050 Fund returned 19.38%. The Fund compares its performance to the S&P Target Date to 2050 Index, which returned 15.46% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date to 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date to 2050 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying fund, Putnam ESG Ultra Short ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class B 19.38 9.07 7.62 Class B (with sales charge) 14.38 8.79 7.62 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2050 Index 1 15.46 10.00 8.39 S&P 500 Index 22.15 15.00 13.15	[138]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 167,933,237
Holdings Count | $ / shares	8	[139]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $167,933,237 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 17%	[139]
Holdings [Text Block]		[140]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. Effective September 5, 2024 (the “Conversion Date”), class B shares of the Fund acquired prior to the Conversion Date will convert automatically to class A shares.   This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class C
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2050 Fund
Class Name	Class C
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2050 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class C 1 $116 1.06%	[141],[142]
Expenses Paid, Amount	$ 116	[141]
Expense Ratio, Percent	1.06%	[141]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class C shares of Putnam Sustainable Retirement 2050 Fund returned 19.42%. The Fund compares its performance to the S&P Target Date to 2050 Index, which returned 15.46% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date to 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date to 2050 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying fund, Putnam ESG Ultra Short ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class C 19.42 9.07 7.62 Class C (with sales charge) 18.42 9.07 7.62 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2050 Index 1 15.46 10.00 8.39 S&P 500 Index 22.15 15.00 13.15	[143]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 167,933,237
Holdings Count | $ / shares	8	[144]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $167,933,237 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 17%	[144]
Holdings [Text Block]		[145]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2050 Fund
Class Name	Class R
Trading Symbol	PRRKX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2050 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R 1 $78 0.71%	[146],[147]
Expenses Paid, Amount	$ 78	[146]
Expense Ratio, Percent	0.71%	[146]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R shares of Putnam Sustainable Retirement 2050 Fund returned 19.79%. The Fund compares its performance to the S&P Target Date to 2050 Index, which returned 15.46% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date to 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date to 2050 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying fund, Putnam ESG Ultra Short ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R 19.79 9.50 7.95 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2050 Index 1 15.46 10.00 8.39 S&P 500 Index 22.15 15.00 13.15	[148]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 167,933,237
Holdings Count | $ / shares	8	[149]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $167,933,237 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 17%	[149]
Holdings [Text Block]		[150]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R3
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2050 Fund
Class Name	Class R3
Trading Symbol	PADWX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2050 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R3 1 $51 0.46%	[151],[152]
Expenses Paid, Amount	$ 51	[151]
Expense Ratio, Percent	0.46%	[151]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R3 shares of Putnam Sustainable Retirement 2050 Fund returned 20.14%. The Fund compares its performance to the S&P Target Date to 2050 Index, which returned 15.46% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date to 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date to 2050 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying fund, Putnam ESG Ultra Short ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R3 20.14 9.75 8.17 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2050 Index 1 15.46 10.00 8.39 S&P 500 Index 22.15 15.00 13.15	[153]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 167,933,237
Holdings Count | $ / shares	8	[154]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $167,933,237 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 17%	[154]
Holdings [Text Block]		[155]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R4
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2050 Fund
Class Name	Class R4
Trading Symbol	PAEHX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2050 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R4 1 $23 0.21%	[156],[157]
Expenses Paid, Amount	$ 23	[156]
Expense Ratio, Percent	0.21%	[156]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R4 shares of Putnam Sustainable Retirement 2050 Fund returned 20.36%. The Fund compares its performance to the S&P Target Date to 2050 Index, which returned 15.46% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date to 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date to 2050 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying fund, Putnam ESG Ultra Short ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R4 20.36 10.02 8.44 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2050 Index 1 15.46 10.00 8.39 S&P 500 Index 22.15 15.00 13.15	[158]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 167,933,237
Holdings Count | $ / shares	8	[159]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $167,933,237 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 17%	[159]
Holdings [Text Block]		[160]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R5
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2050 Fund
Class Name	Class R5
Trading Symbol	PAEJX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2050 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R5 1 $7 0.06%	[161],[162]
Expenses Paid, Amount	$ 7	[161]
Expense Ratio, Percent	0.06%	[161]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R5 shares of Putnam Sustainable Retirement 2050 Fund returned 20.59%. The Fund compares its performance to the S&P Target Date to 2050 Index, which returned 15.46% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date to 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date to 2050 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying fund, Putnam ESG Ultra Short ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R5 20.59 10.19 8.58 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2050 Index 1 15.46 10.00 8.39 S&P 500 Index 22.15 15.00 13.15	[163]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 167,933,237
Holdings Count | $ / shares	8	[164]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $167,933,237 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 17%	[164]
Holdings [Text Block]		[165]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R6
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2050 Fund
Class Name	Class R6
Trading Symbol	PREUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2050 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R6 1 -$4 -0.04%	[166],[167]
Expenses Paid, Amount	$ (4)	[166]
Expense Ratio, Percent	(0.04%)	[166]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R6 shares of Putnam Sustainable Retirement 2050 Fund returned 20.68%. The Fund compares its performance to the S&P Target Date to 2050 Index, which returned 15.46% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date to 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date to 2050 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying fund, Putnam ESG Ultra Short ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R6 20.68 10.26 8.61 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2050 Index 1 15.46 10.00 8.39 S&P 500 Index 22.15 15.00 13.15	[168]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 167,933,237
Holdings Count | $ / shares	8	[169]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $167,933,237 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 17%	[169]
Holdings [Text Block]		[170]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class Y
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2050 Fund
Class Name	Class Y
Trading Symbol	PRRUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2050 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class Y 1 $7 0.06%	[171],[172]
Expenses Paid, Amount	$ 7	[171]
Expense Ratio, Percent	0.06%	[171]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class Y shares of Putnam Sustainable Retirement 2050 Fund returned 20.62%. The Fund compares its performance to the S&P Target Date to 2050 Index, which returned 15.46% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date to 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date to 2050 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ Allocation effects within the underlying fund, Putnam ESG Ultra Short ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class Y 20.62 10.16 8.53 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2050 Index 1 15.46 10.00 8.39 S&P 500 Index 22.15 15.00 13.15	[173]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 167,933,237
Holdings Count | $ / shares	8	[174]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	17%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $167,933,237 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 17%	[174]
Holdings [Text Block]		[175]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class A
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2045 Fund
Class Name	Class A
Trading Symbol	PRVLX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2045 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class A 1 $35 0.32%	[176],[177]
Expenses Paid, Amount	$ 35	[176]
Expense Ratio, Percent	0.32%	[176]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class A shares of Putnam Sustainable Retirement 2045 Fund returned 19.49%. The Fund compares its performance to the S&P Target Date To 2045 Index, which returned 14.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class A 19.49 9.16 7.83 Class A (with sales charge) 12.62 7.87 7.19 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2045 Index 1 14.73 9.55 8.10 S&P 500 Index 22.15 15.00 13.15	[178]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 218,486,507
Holdings Count | $ / shares	8	[179]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	21%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $218,486,507 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 21%	[179]
Holdings [Text Block]		[180]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class B
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2045 Fund
Class Name	Class B
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2045 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class B 1 $117 1.07%	[181],[182]
Expenses Paid, Amount	$ 117	[181]
Expense Ratio, Percent	1.07%	[181]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class B shares of Putnam Sustainable Retirement 2045 Fund returned 18.57%. The Fund compares its performance to the S&P Target Date To 2045 Index, which returned 14.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class B 18.57 8.34 7.19 Class B (with sales charge) 13.57 8.05 7.19 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2045 Index 1 14.73 9.55 8.10 S&P 500 Index 22.15 15.00 13.15	[183]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 218,486,507
Holdings Count | $ / shares	8	[184]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	21%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $218,486,507 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 21%	[184]
Holdings [Text Block]		[185]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. Effective September 5, 2024 (the “Conversion Date”), class B shares of the Fund acquired prior to the Conversion Date will convert automatically to class A shares. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class C
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2045 Fund
Class Name	Class C
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2045 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class C 1 $117 1.07%	[186],[187]
Expenses Paid, Amount	$ 117	[186]
Expense Ratio, Percent	1.07%	[186]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class C shares of Putnam Sustainable Retirement 2045 Fund returned 18.55%. The Fund compares its performance to the S&P Target Date To 2045 Index, which returned 14.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class C 18.55 8.34 7.19 Class C (with sales charge) 17.55 8.34 7.19 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2045 Index 1 14.73 9.55 8.10 S&P 500 Index 22.15 15.00 13.15	[188]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 218,486,507
Holdings Count | $ / shares	8	[189]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	21%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $218,486,507 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 21%	[189]
Holdings [Text Block]		[190]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2045 Fund
Class Name	Class R
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2045 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R 1 $79 0.72%	[191],[192]
Expenses Paid, Amount	$ 79	[191]
Expense Ratio, Percent	0.72%	[191]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R shares of Putnam Sustainable Retirement 2045 Fund returned 19.04%. The Fund compares its performance to the S&P Target Date To 2045 Index, which returned 14.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R 19.04 8.78 7.50 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2045 Index 1 14.73 9.55 8.10 S&P 500 Index 22.15 15.00 13.15	[193]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 218,486,507
Holdings Count | $ / shares	8	[194]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	21%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $218,486,507 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 21%	[194]
Holdings [Text Block]		[195]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R3
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2045 Fund
Class Name	Class R3
Trading Symbol	PACGX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2045 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R3 1 $52 0.47%	[196],[197]
Expenses Paid, Amount	$ 52	[196]
Expense Ratio, Percent	0.47%	[196]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R3 shares of Putnam Sustainable Retirement 2045 Fund returned 19.33%. The Fund compares its performance to the S&P Target Date To 2045 Index, which returned 14.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R3 19.33 9.05 7.74 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2045 Index 1 14.73 9.55 8.10 S&P 500 Index 22.15 15.00 13.15	[198]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 218,486,507
Holdings Count | $ / shares	8	[199]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	21%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $218,486,507 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 21%	[199]
Holdings [Text Block]		[200]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R4
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2045 Fund
Class Name	Class R4
Trading Symbol	PACFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2045 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R4 1 $24 0.22%	[201],[202]
Expenses Paid, Amount	$ 24	[201]
Expense Ratio, Percent	0.22%	[201]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R4 shares of Putnam Sustainable Retirement 2045 Fund returned 19.58%. The Fund compares its performance to the S&P Target Date To 2045 Index, which returned 14.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R4 19.58 9.32 8.01 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2045 Index 1 14.73 9.55 8.10 S&P 500 Index 22.15 15.00 13.15	[203]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 218,486,507
Holdings Count | $ / shares	8	[204]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	21%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $218,486,507 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 21%	[204]
Holdings [Text Block]		[205]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R5
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2045 Fund
Class Name	Class R5
Trading Symbol	PACHX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2045 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R5 1 $8 0.07%	[206],[207]
Expenses Paid, Amount	$ 8	[206]
Expense Ratio, Percent	0.07%	[206]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R5 shares of Putnam Sustainable Retirement 2045 Fund returned 19.76%. The Fund compares its performance to the S&P Target Date To 2045 Index, which returned 14.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R5 19.76 9.46 8.15 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2045 Index 1 14.73 9.55 8.10 S&P 500 Index 22.15 15.00 13.15	[208]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 218,486,507
Holdings Count | $ / shares	8	[209]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	21%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $218,486,507 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 21%	[209]
Holdings [Text Block]		[210]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R6
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2045 Fund
Class Name	Class R6
Trading Symbol	PREKX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2045 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R6 1 -$3 -0.03%	[211],[212]
Expenses Paid, Amount	$ (3)	[211]
Expense Ratio, Percent	(0.03%)	[211]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R6 shares of Putnam Sustainable Retirement 2045 Fund returned 19.94%. The Fund compares its performance to the S&P Target Date To 2045 Index, which returned 14.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R6 19.94 9.54 8.19 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2045 Index 1 14.73 9.55 8.10 S&P 500 Index 22.15 15.00 13.15	[213]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 218,486,507
Holdings Count | $ / shares	8	[214]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	21%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $218,486,507 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 21%	[214]
Holdings [Text Block]		[215]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class Y
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2045 Fund
Class Name	Class Y
Trading Symbol	PRVYX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2045 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class Y 1 $8 0.07%	[216],[217]
Expenses Paid, Amount	$ 8	[216]
Expense Ratio, Percent	0.07%	[216]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class Y shares of Putnam Sustainable Retirement 2045 Fund returned 19.77%. The Fund compares its performance to the S&P Target Date To 2045 Index, which returned 14.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class Y 19.77 9.45 8.11 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2045 Index 1 14.73 9.55 8.10 S&P 500 Index 22.15 15.00 13.15	[218]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 218,486,507
Holdings Count | $ / shares	8	[219]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	21%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $218,486,507 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 21%	[219]
Holdings [Text Block]		[220]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class A
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2040 Fund
Class Name	Class A
Trading Symbol	PRRZX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2040 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class A 1 $37 0.34%	[221],[222]
Expenses Paid, Amount	$ 37	[221]
Expense Ratio, Percent	0.34%	[221]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class A shares of Putnam Sustainable Retirement 2040 Fund returned 18.34%. The Fund compares its performance to the S&P Target Date To 2040 Index, which returned 13.85% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class A 18.34 8.14 7.16 Class A (with sales charge) 11.53 6.86 6.53 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2040 Index 1 13.85 8.89 7.68 S&P 500 Index 22.15 15.00 13.15	[223]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 272,304,739
Holdings Count | $ / shares	8	[224]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $272,304,739 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 25%	[224]
Holdings [Text Block]		[225]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class B
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2040 Fund
Class Name	Class B
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2040 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class B 1 $119 1.09%	[226],[227]
Expenses Paid, Amount	$ 119	[226]
Expense Ratio, Percent	1.09%	[226]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class B shares of Putnam Sustainable Retirement 2040 Fund returned 17.47%. The Fund compares its performance to the S&P Target Date To 2040 Index, which returned 13.85% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class B 17.47 7.33 6.52 Class B (with sales charge) 12.47 7.03 6.52 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2040 Index 1 13.85 8.89 7.68 S&P 500 Index 22.15 15.00 13.15	[228]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 272,304,739
Holdings Count | $ / shares	8	[229]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $272,304,739 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 25%	[229]
Holdings [Text Block]		[230]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. Effective September 5, 2024 (the “Conversion Date”), class B shares of the Fund acquired prior to the Conversion Date will convert automatically to class A shares. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class C
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2040 Fund
Class Name	Class C
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2040 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class C 1 $118 1.09%	[231],[232]
Expenses Paid, Amount	$ 118	[231]
Expense Ratio, Percent	1.09%	[231]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class C shares of Putnam Sustainable Retirement 2040 Fund returned 17.41%. The Fund compares its performance to the S&P Target Date To 2040 Index, which returned 13.85% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class C 17.41 7.32 6.53 Class C (with sales charge) 16.41 7.32 6.53 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2040 Index 1 13.85 8.89 7.68 S&P 500 Index 22.15 15.00 13.15	[233]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 272,304,739
Holdings Count | $ / shares	8	[234]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $272,304,739 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 25%	[234]
Holdings [Text Block]		[235]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2040 Fund
Class Name	Class R
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2040 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R 1 $81 0.74%	[236],[237]
Expenses Paid, Amount	$ 81	[236]
Expense Ratio, Percent	0.74%	[236]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R shares of Putnam Sustainable Retirement 2040 Fund returned 17.87%. The Fund compares its performance to the S&P Target Date To 2040 Index, which returned 13.85% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R 17.87 7.75 6.84 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2040 Index 1 13.85 8.89 7.68 S&P 500 Index 22.15 15.00 13.15	[238]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 272,304,739
Holdings Count | $ / shares	8	[239]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $272,304,739 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 25%	[239]
Holdings [Text Block]		[240]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R3
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2040 Fund
Class Name	Class R3
Trading Symbol	PAAUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2040 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R3 1 $53 0.49%	[241],[242]
Expenses Paid, Amount	$ 53	[241]
Expense Ratio, Percent	0.49%	[241]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R3 shares of Putnam Sustainable Retirement 2040 Fund returned 18.16%. The Fund compares its performance to the S&P Target Date To 2040 Index, which returned 13.85% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R3 18.16 7.99 7.05 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2040 Index 1 13.85 8.89 7.68 S&P 500 Index 22.15 15.00 13.15	[243]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 272,304,739
Holdings Count | $ / shares	8	[244]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $272,304,739 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 25%	[244]
Holdings [Text Block]		[245]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R4
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2040 Fund
Class Name	Class R4
Trading Symbol	PAAYX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2040 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R4 1 $26 0.24%	[246],[247]
Expenses Paid, Amount	$ 26	[246]
Expense Ratio, Percent	0.24%	[246]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R4 shares of Putnam Sustainable Retirement 2040 Fund returned 18.49%. The Fund compares its performance to the S&P Target Date To 2040 Index, which returned 13.85% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R4 18.49 8.26 7.31 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2040 Index 1 13.85 8.89 7.68 S&P 500 Index 22.15 15.00 13.15	[248]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 272,304,739
Holdings Count | $ / shares	8	[249]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $272,304,739 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 25%	[249]
Holdings [Text Block]		[250]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R5
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2040 Fund
Class Name	Class R5
Trading Symbol	PABTX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2040 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R5 1 $10 0.09%	[251],[252]
Expenses Paid, Amount	$ 10	[251]
Expense Ratio, Percent	0.09%	[251]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R5 shares of Putnam Sustainable Retirement 2040 Fund returned 18.66%. The Fund compares its performance to the S&P Target Date To 2040 Index, which returned 13.85% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R5 18.66 8.43 7.46 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2040 Index 1 13.85 8.89 7.68 S&P 500 Index 22.15 15.00 13.15	[253]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 272,304,739
Holdings Count | $ / shares	8	[254]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $272,304,739 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 25%	[254]
Holdings [Text Block]		[255]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R6
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2040 Fund
Class Name	Class R6
Trading Symbol	PREHX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2040 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R6 1 -$1 -0.01%	[256],[257]
Expenses Paid, Amount	$ (1)	[256]
Expense Ratio, Percent	(0.01%)	[256]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R6 shares of Putnam Sustainable Retirement 2040 Fund returned 18.76%. The Fund compares its performance to the S&P Target Date To 2040 Index, which returned 13.85% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R6 18.76 8.51 7.51 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2040 Index 1 13.85 8.89 7.68 S&P 500 Index 22.15 15.00 13.15	[258]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 272,304,739
Holdings Count | $ / shares	8	[259]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $272,304,739 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 25%	[259]
Holdings [Text Block]		[260]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class Y
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2040 Fund
Class Name	Class Y
Trading Symbol	PRZZX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2040 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class Y 1 $10 0.09%	[261],[262]
Expenses Paid, Amount	$ 10	[261]
Expense Ratio, Percent	0.09%	[261]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class Y shares of Putnam Sustainable Retirement 2040 Fund returned 18.63%. The Fund compares its performance to the S&P Target Date To 2040 Index, which returned 13.85% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class Y 18.63 8.40 7.43 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2040 Index 1 13.85 8.89 7.68 S&P 500 Index 22.15 15.00 13.15	[263]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 272,304,739
Holdings Count | $ / shares	8	[264]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	25%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $272,304,739 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 25%	[264]
Holdings [Text Block]		[265]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class A
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2035 Fund
Class Name	Class A
Trading Symbol	PRRWX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2035 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class A 1 $39 0.36%	[266],[267]
Expenses Paid, Amount	$ 39	[266]
Expense Ratio, Percent	0.36%	[266]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class A shares of Putnam Sustainable Retirement 2035 Fund returned 16.67%. The Fund compares its performance to the S&P Target Date To 2035 Index, which returned 12.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class A 16.67 6.77 6.24 Class A (with sales charge) 9.96 5.51 5.61 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2035 Index 1 12.73 8.10 7.11 S&P 500 Index 22.15 15.00 13.15	[268]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 284,146,121
Holdings Count | $ / shares	8	[269]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	27%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $284,146,121 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 27%	[269]
Holdings [Text Block]		[270]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class B
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2035 Fund
Class Name	Class B
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2035 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class B 1 $120 1.11%	[271],[272]
Expenses Paid, Amount	$ 120	[271]
Expense Ratio, Percent	1.11%	[271]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class B shares of Putnam Sustainable Retirement 2035 Fund returned 15.79%. The Fund compares its performance to the S&P Target Date To 2035 Index, which returned 12.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class B 15.79 5.98 5.60 Class B (with sales charge) 10.79 5.66 5.60 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2035 Index 1 12.73 8.10 7.11 S&P 500 Index 22.15 15.00 13.15	[273]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 284,146,121
Holdings Count | $ / shares	8	[274]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	27%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $284,146,121 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 27%	[274]
Holdings [Text Block]		[275]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. Effective September 5, 2024 (the “Conversion Date”), class B shares of the Fund acquired prior to the Conversion Date will convert automatically to class A shares. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class C
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2035 Fund
Class Name	Class C
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2035 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class C 1 $120 1.11%	[276],[277]
Expenses Paid, Amount	$ 120	[276]
Expense Ratio, Percent	1.11%	[276]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class C shares of Putnam Sustainable Retirement 2035 Fund returned 15.77%. The Fund compares its performance to the S&P Target Date To 2035 Index, which returned 12.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class C 15.77 5.98 5.60 Class C (with sales charge) 14.77 5.98 5.60 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2035 Index 1 12.73 8.10 7.11 S&P 500 Index 22.15 15.00 13.15	[278]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 284,146,121
Holdings Count | $ / shares	8	[279]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	27%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $284,146,121 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 27%	[279]
Holdings [Text Block]		[280]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2035 Fund
Class Name	Class R
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2035 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R 1 $82 0.76%	[281],[282]
Expenses Paid, Amount	$ 82	[281]
Expense Ratio, Percent	0.76%	[281]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R shares of Putnam Sustainable Retirement 2035 Fund returned 16.23%. The Fund compares its performance to the S&P Target Date To 2035 Index, which returned 12.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R 16.23 6.39 5.92 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2035 Index 1 12.73 8.10 7.11 S&P 500 Index 22.15 15.00 13.15	[283]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 284,146,121
Holdings Count | $ / shares	8	[284]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	27%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $284,146,121 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 27%	[284]
Holdings [Text Block]		[285]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R3
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2035 Fund
Class Name	Class R3
Trading Symbol	PADUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2035 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R3 1 $55 0.51%	[286],[287]
Expenses Paid, Amount	$ 55	[286]
Expense Ratio, Percent	0.51%	[286]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R3 shares of Putnam Sustainable Retirement 2035 Fund returned 16.52%. The Fund compares its performance to the S&P Target Date To 2035 Index, which returned 12.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R3 16.52 6.65 6.11 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2035 Index 1 12.73 8.10 7.11 S&P 500 Index 22.15 15.00 13.15	[288]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 284,146,121
Holdings Count | $ / shares	8	[289]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	27%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $284,146,121 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 27%	[289]
Holdings [Text Block]		[290]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R4
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2035 Fund
Class Name	Class R4
Trading Symbol	PADSX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2035 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R4 1 $28 0.26%	[291],[292]
Expenses Paid, Amount	$ 28	[291]
Expense Ratio, Percent	0.26%	[291]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R4 shares of Putnam Sustainable Retirement 2035 Fund returned 16.82%. The Fund compares its performance to the S&P Target Date To 2035 Index, which returned 12.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R4 16.82 6.91 6.37 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2035 Index 1 12.73 8.10 7.11 S&P 500 Index 22.15 15.00 13.15	[293]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 284,146,121
Holdings Count | $ / shares	8	[294]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	27%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $284,146,121 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 27%	[294]
Holdings [Text Block]		[295]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R5
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2035 Fund
Class Name	Class R5
Trading Symbol	PADVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2035 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R5 1 $12 0.11%	[296],[297]
Expenses Paid, Amount	$ 12	[296]
Expense Ratio, Percent	0.11%	[296]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R5 shares of Putnam Sustainable Retirement 2035 Fund returned 16.96%. The Fund compares its performance to the S&P Target Date To 2035 Index, which returned 12.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R5 16.96 7.05 6.52 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2035 Index 1 12.73 8.10 7.11 S&P 500 Index 22.15 15.00 13.15	[298]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 284,146,121
Holdings Count | $ / shares	8	[299]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	27%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $284,146,121 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 27%	[299]
Holdings [Text Block]		[300]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R6
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2035 Fund
Class Name	Class R6
Trading Symbol	PREGX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2035 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R6 1 $1 0.01%	[301],[302]
Expenses Paid, Amount	$ 1	[301]
Expense Ratio, Percent	0.01%	[301]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R6 shares of Putnam Sustainable Retirement 2035 Fund returned 17.10%. The Fund compares its performance to the S&P Target Date To 2035 Index, which returned 12.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R6 17.10 7.15 6.58 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2035 Index 1 12.73 8.10 7.11 S&P 500 Index 22.15 15.00 13.15	[303]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 284,146,121
Holdings Count | $ / shares	8	[304]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	27%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $284,146,121 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 27%	[304]
Holdings [Text Block]		[305]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class Y
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2035 Fund
Class Name	Class Y
Trading Symbol	PRRYX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2035 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class Y 1 $12 0.11%	[306],[307]
Expenses Paid, Amount	$ 12	[306]
Expense Ratio, Percent	0.11%	[306]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class Y shares of Putnam Sustainable Retirement 2035 Fund returned 16.99%. The Fund compares its performance to the S&P Target Date To 2035 Index, which returned 12.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam PanAgora ESG International Equity ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class Y 16.99 7.06 6.51 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2035 Index 1 12.73 8.10 7.11 S&P 500 Index 22.15 15.00 13.15	[308]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 284,146,121
Holdings Count | $ / shares	8	[309]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	27%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $284,146,121 Total Number of Portfolio Holdings * 8 Total Management Fee Paid $0 Portfolio Turnover Rate 27%	[309]
Holdings [Text Block]		[310]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class A
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2030 Fund
Class Name	Class A
Trading Symbol	PRRQX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2030 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class A 1 $44 0.41%	[311],[312]
Expenses Paid, Amount	$ 44	[311]
Expense Ratio, Percent	0.41%	[311]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class A shares of Putnam Sustainable Retirement 2030 Fund returned 13.55%. The Fund compares its performance to the S&P Target Date To 2030 Index, which returned 11.36% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class A 13.55 4.95 5.01 Class A (with sales charge) 7.02 3.71 4.39 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2030 Index 1 11.36 7.01 6.41 S&P 500 Index 22.15 15.00 13.15	[313]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 294,483,145
Holdings Count | $ / shares	7	[314]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $294,483,145 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[314]
Holdings [Text Block]		[315]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class B
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2030 Fund
Class Name	Class B
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2030 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class B 1 $123 1.16%	[316],[317]
Expenses Paid, Amount	$ 123	[316]
Expense Ratio, Percent	1.16%	[316]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class B shares of Putnam Sustainable Retirement 2030 Fund returned 12.71%. The Fund compares its performance to the S&P Target Date To 2030 Index, which returned 11.36% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class B 12.71 4.17 4.38 Class B (with sales charge) 7.71 3.84 4.38 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2030 Index 1 11.36 7.01 6.41 S&P 500 Index 22.15 15.00 13.15	[318]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 294,483,145
Holdings Count | $ / shares	7	[319]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $294,483,145 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[319]
Holdings [Text Block]		[320]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. Effective September 5, 2024 (the “Conversion Date”), class B shares of the Fund acquired prior to the Conversion Date will convert automatically to class A shares. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581  or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class C
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2030 Fund
Class Name	Class C
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2030 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class C 1 $123 1.16%	[321],[322]
Expenses Paid, Amount	$ 123	[321]
Expense Ratio, Percent	1.16%	[321]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class C shares of Putnam Sustainable Retirement 2030 Fund returned 12.77%. The Fund compares its performance to the S&P Target Date To 2030 Index, which returned 11.36% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class C 12.77 4.17 4.39 Class C (with sales charge) 11.77 4.17 4.39 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2030 Index 1 11.36 7.01 6.41 S&P 500 Index 22.15 15.00 13.15	[323]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 294,483,145
Holdings Count | $ / shares	7	[324]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $294,483,145 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[324]
Holdings [Text Block]		[325]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2030 Fund
Class Name	Class R
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2030 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R 1 $86 0.81%	[326],[327]
Expenses Paid, Amount	$ 86	[326]
Expense Ratio, Percent	0.81%	[326]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R shares of Putnam Sustainable Retirement 2030 Fund returned 13.17%. The Fund compares its performance to the S&P Target Date To 2030 Index, which returned 11.36% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R 13.17 4.58 4.70 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2030 Index 1 11.36 7.01 6.41 S&P 500 Index 22.15 15.00 13.15	[328]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 294,483,145
Holdings Count | $ / shares	7	[329]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $294,483,145 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[329]
Holdings [Text Block]		[330]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R3
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2030 Fund
Class Name	Class R3
Trading Symbol	PADOX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2030 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R3 1 $60 0.56%	[331],[332]
Expenses Paid, Amount	$ 60	[331]
Expense Ratio, Percent	0.56%	[331]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R3 shares of Putnam Sustainable Retirement 2030 Fund returned 13.42%. The Fund compares its performance to the S&P Target Date To 2030 Index, which returned 11.36% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R3 13.42 4.80 4.87 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2030 Index 1 11.36 7.01 6.41 S&P 500 Index 22.15 15.00 13.15	[333]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 294,483,145
Holdings Count | $ / shares	7	[334]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $294,483,145 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[334]
Holdings [Text Block]		[335]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R4
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2030 Fund
Class Name	Class R4
Trading Symbol	PADNX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2030 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R4 1 $33 0.31%	[336],[337]
Expenses Paid, Amount	$ 33	[336]
Expense Ratio, Percent	0.31%	[336]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R4 shares of Putnam Sustainable Retirement 2030 Fund returned 13.74%. The Fund compares its performance to the S&P Target Date To 2030 Index, which returned 11.36% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R4 13.74 5.06 5.13 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2030 Index 1 11.36 7.01 6.41 S&P 500 Index 22.15 15.00 13.15	[338]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 294,483,145
Holdings Count | $ / shares	7	[339]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $294,483,145 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[339]
Holdings [Text Block]		[340]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R5
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2030 Fund
Class Name	Class R5
Trading Symbol	PADRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2030 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R5 1 $17 0.16%	[341],[342]
Expenses Paid, Amount	$ 17	[341]
Expense Ratio, Percent	0.16%	[341]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R5 shares of Putnam Sustainable Retirement 2030 Fund returned 13.88%. The Fund compares its performance to the S&P Target Date To 2030 Index, which returned 11.36% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R5 13.88 5.22 5.27 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2030 Index 1 11.36 7.01 6.41 S&P 500 Index 22.15 15.00 13.15	[343]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 294,483,145
Holdings Count | $ / shares	7	[344]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $294,483,145 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[344]
Holdings [Text Block]		[345]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R6
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2030 Fund
Class Name	Class R6
Trading Symbol	PREZX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2030 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R6 1 $6 0.06%	[346],[347]
Expenses Paid, Amount	$ 6	[346]
Expense Ratio, Percent	0.06%	[346]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R6 shares of Putnam Sustainable Retirement 2030 Fund returned 13.97%. The Fund compares its performance to the S&P Target Date To 2030 Index, which returned 11.36% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R6 13.97 5.31 5.35 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2030 Index 1 11.36 7.01 6.41 S&P 500 Index 22.15 15.00 13.15	[348]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 294,483,145
Holdings Count | $ / shares	7	[349]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $294,483,145 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[349]
Holdings [Text Block]		[350]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class Y
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2030 Fund
Class Name	Class Y
Trading Symbol	PRRTX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2030 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class Y 1 $17 0.16%	[351],[352]
Expenses Paid, Amount	$ 17	[351]
Expense Ratio, Percent	0.16%	[351]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class Y shares of Putnam Sustainable Retirement 2030 Fund returned 13.91%. The Fund compares its performance to the S&P Target Date To 2030 Index, which returned 11.36% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF   ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class Y 13.91 5.22 5.28 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2030 Index 1 11.36 7.01 6.41 S&P 500 Index 22.15 15.00 13.15	[353]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 294,483,145
Holdings Count | $ / shares	7	[354]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	29%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $294,483,145 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 29%	[354]
Holdings [Text Block]		[355]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class A
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2025 Fund
Class Name	Class A
Trading Symbol	PRROX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2025 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class A 1 $45 0.43%	[356],[357]
Expenses Paid, Amount	$ 45	[356]
Expense Ratio, Percent	0.43%	[356]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class A shares of Putnam Sustainable Retirement 2025 Fund returned 11.41%. The Fund compares its performance to the S&P Target Date To 2025 Index, which returned 10.01% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class A 11.41 3.39 3.83 Class A (with sales charge) 5.00 2.17 3.22 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2025 Index 1 10.01 5.88 5.63 S&P 500 Index 22.15 15.00 13.15	[358]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 275,838,070
Holdings Count | $ / shares	7	[359]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $275,838,070 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 32%	[359]
Holdings [Text Block]		[360]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class B
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2025 Fund
Class Name	Class B
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2025 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class B 1 $124 1.18%	[361],[362]
Expenses Paid, Amount	$ 124	[361]
Expense Ratio, Percent	1.18%	[361]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class B shares of Putnam Sustainable Retirement 2025 Fund returned 10.59%. The Fund compares its performance to the S&P Target Date To 2025 Index, which returned 10.01% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class B 10.59 2.61 3.20 Class B (with sales charge) 5.59 2.27 3.20 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2025 Index 1 10.01 5.88 5.63 S&P 500 Index 22.15 15.00 13.15	[363]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 275,838,070
Holdings Count | $ / shares	7	[364]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $275,838,070 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 32%	[364]
Holdings [Text Block]		[365]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. Effective September 5, 2024 (the “Conversion Date”), class B shares of the Fund acquired prior to the Conversion Date will convert automatically to class A shares. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class C
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2025 Fund
Class Name	Class C
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2025 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class C 1 $124 1.18%	[366],[367]
Expenses Paid, Amount	$ 124	[366]
Expense Ratio, Percent	1.18%	[366]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class C shares of Putnam Sustainable Retirement 2025 Fund returned 10.58%. The Fund compares its performance to the S&P Target Date To 2025 Index, which returned 10.01% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class C 10.58 2.61 3.21 Class C (with sales charge) 9.57 2.61 3.21 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2025 Index 1 10.01 5.88 5.63 S&P 500 Index 22.15 15.00 13.15	[368]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 275,838,070
Holdings Count | $ / shares	7	[369]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $275,838,070 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 32%	[369]
Holdings [Text Block]		[370]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2025 Fund
Class Name	Class R
No Trading Symbol Flag	true
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2025 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R 1 $88 0.83%	[371],[372]
Expenses Paid, Amount	$ 88	[371]
Expense Ratio, Percent	0.83%	[371]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R shares of Putnam Sustainable Retirement 2025 Fund returned 11.01%. The Fund compares its performance to the S&P Target Date To 2025 Index, which returned 10.01% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R 11.01 3.02 3.51 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2025 Index 1 10.01 5.88 5.63 S&P 500 Index 22.15 15.00 13.15	[373]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 275,838,070
Holdings Count | $ / shares	7	[374]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $275,838,070 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 32%	[374]
Holdings [Text Block]		[375]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R3
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2025 Fund
Class Name	Class R3
Trading Symbol	PADHX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2025 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R3 1 $61 0.58%	[376],[377]
Expenses Paid, Amount	$ 61	[376]
Expense Ratio, Percent	0.58%	[376]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R3 shares of Putnam Sustainable Retirement 2025 Fund returned 11.23%. The Fund compares its performance to the S&P Target Date To 2025 Index, which returned 10.01% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R3 11.23 3.24 3.68 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2025 Index 1 10.01 5.88 5.63 S&P 500 Index 22.15 15.00 13.15	[378]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 275,838,070
Holdings Count | $ / shares	7	[379]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $275,838,070 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 32%	[379]
Holdings [Text Block]		[380]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R4
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2025 Fund
Class Name	Class R4
Trading Symbol	PADJX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2025 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R4 1 $35 0.33%	[381],[382]
Expenses Paid, Amount	$ 35	[381]
Expense Ratio, Percent	0.33%	[381]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R4 shares of Putnam Sustainable Retirement 2025 Fund returned 11.54%. The Fund compares its performance to the S&P Target Date To 2025 Index, which returned 10.01% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R4 11.54 3.50 3.94 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2025 Index 1 10.01 5.88 5.63 S&P 500 Index 22.15 15.00 13.15	[383]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 275,838,070
Holdings Count | $ / shares	7	[384]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $275,838,070 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 32%	[384]
Holdings [Text Block]		[385]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R5
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2025 Fund
Class Name	Class R5
Trading Symbol	PADKX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2025 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R5 1 $19 0.18%	[386],[387]
Expenses Paid, Amount	$ 19	[386]
Expense Ratio, Percent	0.18%	[386]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R5 shares of Putnam Sustainable Retirement 2025 Fund returned 11.72%. The Fund compares its performance to the S&P Target Date To 2025 Index, which returned 10.01% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R5 11.72 3.65 4.08 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2025 Index 1 10.01 5.88 5.63 S&P 500 Index 22.15 15.00 13.15	[388]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 275,838,070
Holdings Count | $ / shares	7	[389]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $275,838,070 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 32%	[389]
Holdings [Text Block]		[390]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R6
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2025 Fund
Class Name	Class R6
Trading Symbol	PRMFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2025 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R6 1 $8 0.08%	[391],[392]
Expenses Paid, Amount	$ 8	[391]
Expense Ratio, Percent	0.08%	[391]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R6 shares of Putnam Sustainable Retirement 2025 Fund returned 11.81%. The Fund compares its performance to the S&P Target Date To 2025 Index, which returned 10.01% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R6 11.81 3.74 4.16 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2025 Index 1 10.01 5.88 5.63 S&P 500 Index 22.15 15.00 13.15	[393]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 275,838,070
Holdings Count | $ / shares	7	[394]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $275,838,070 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 32%	[394]
Holdings [Text Block]		[395]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class Y
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement 2025 Fund
Class Name	Class Y
Trading Symbol	PRRPX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement 2025 Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class Y 1 $19 0.18%	[396],[397]
Expenses Paid, Amount	$ 19	[396]
Expense Ratio, Percent	0.18%	[396]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class Y shares of Putnam Sustainable Retirement 2025 Fund returned 11.68%. The Fund compares its performance to the S&P Target Date To 2025 Index, which returned 10.01% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class Y 11.68 3.65 4.08 Russell 3000 Index 21.07 14.23 12.58 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 S&P Target Date To 2025 Index 1 10.01 5.88 5.63 S&P 500 Index 22.15 15.00 13.15	[398]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 275,838,070
Holdings Count | $ / shares	7	[399]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	32%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $275,838,070 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 32%	[399]
Holdings [Text Block]		[400]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class A
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement Maturity Fund
Class Name	Class A
Trading Symbol	PRMAX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement Maturity Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class A 1 $44 0.42%	[401],[402]
Expenses Paid, Amount	$ 44	[401]
Expense Ratio, Percent	0.42%	[401]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class A shares of Putnam Sustainable Retirement Maturity Fund returned 10.97%. The Fund compares its performance to the S&P Target Date To Retirement Income Index, which returned 8.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class A 10.97 2.58 2.68 Class A (with sales charge) 6.53 1.75 2.26 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 Russell 3000 Index 21.07 14.23 12.58 S&P Target Date To Retirement Income Index 1 8.73 4.36 4.08 S&P 500 Index 22.15 15.00 13.15	[403]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 203,864,636
Holdings Count | $ / shares	7	[404]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $203,864,636 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 8%	[404]
Holdings [Text Block]		[405]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class B
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement Maturity Fund
Class Name	Class B
Trading Symbol	PRMLX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement Maturity Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class B 1 $123 1.17%	[406],[407]
Expenses Paid, Amount	$ 123	[406]
Expense Ratio, Percent	1.17%	[406]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class B shares of Putnam Sustainable Retirement Maturity Fund returned 10.12%. The Fund compares its performance to the S&P Target Date To Retirement Income Index, which returned 8.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class B 10.12 1.82 2.06 Class B (with sales charge) 5.12 1.47 2.06 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 Russell 3000 Index 21.07 14.23 12.58 S&P Target Date To Retirement Income Index 1 8.73 4.36 4.08 S&P 500 Index 22.15 15.00 13.15	[408]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 203,864,636
Holdings Count | $ / shares	7	[409]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $203,864,636 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 8%	[409]
Holdings [Text Block]		[410]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. Effective September 5, 2024 (the “Conversion Date”), class B shares of the Fund acquired prior to the Conversion Date will convert automatically to class A shares.   This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class C
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement Maturity Fund
Class Name	Class C
Trading Symbol	PRMCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement Maturity Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class C 1 $123 1.17%	[411],[412]
Expenses Paid, Amount	$ 123	[411]
Expense Ratio, Percent	1.17%	[411]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class C shares of Putnam Sustainable Retirement Maturity Fund returned 10.10%. The Fund compares its performance to the S&P Target Date To Retirement Income Index, which returned 8.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class C 10.10 1.82 2.06 Class C (with sales charge) 9.10 1.82 2.06 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 Russell 3000 Index 21.07 14.23 12.58 S&P Target Date To Retirement Income Index 1 8.73 4.36 4.08 S&P 500 Index 22.15 15.00 13.15	[413]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 203,864,636
Holdings Count | $ / shares	7	[414]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $203,864,636 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 8%	[414]
Holdings [Text Block]		[415]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement Maturity Fund
Class Name	Class R
Trading Symbol	PRMKX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement Maturity Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R 1 $86 0.82%	[416],[417]
Expenses Paid, Amount	$ 86	[416]
Expense Ratio, Percent	0.82%	[416]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R shares of Putnam Sustainable Retirement Maturity Fund returned 10.49%. The Fund compares its performance to the S&P Target Date To Retirement Income Index, which returned 8.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R 10.49 2.23 2.36 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 Russell 3000 Index 21.07 14.23 12.58 S&P Target Date To Retirement Income Index 1 8.73 4.36 4.08 S&P 500 Index 22.15 15.00 13.15	[418]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 203,864,636
Holdings Count | $ / shares	7	[419]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $203,864,636 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 8%	[419]
Holdings [Text Block]		[420]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R3
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement Maturity Fund
Class Name	Class R3
Trading Symbol	PACKX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement Maturity Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R3 1 $60 0.57%	[421],[422]
Expenses Paid, Amount	$ 60	[421]
Expense Ratio, Percent	0.57%	[421]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R3 shares of Putnam Sustainable Retirement Maturity Fund returned 10.76%. The Fund compares its performance to the S&P Target Date To Retirement Income Index, which returned 8.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R3 10.76 2.42 2.51 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 Russell 3000 Index 21.07 14.23 12.58 S&P Target Date To Retirement Income Index 1 8.73 4.36 4.08 S&P 500 Index 22.15 15.00 13.15	[423]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 203,864,636
Holdings Count | $ / shares	7	[424]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $203,864,636 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 8%	[424]
Holdings [Text Block]		[425]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R4
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement Maturity Fund
Class Name	Class R4
Trading Symbol	PACPX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement Maturity Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R4 1 $34 0.32%	[426],[427]
Expenses Paid, Amount	$ 34	[426]
Expense Ratio, Percent	0.32%	[426]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R4 shares of Putnam Sustainable Retirement Maturity Fund returned 11.07%. The Fund compares its performance to the S&P Target Date To Retirement Income Index, which returned 8.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R4 11.07 2.69 2.78 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 Russell 3000 Index 21.07 14.23 12.58 S&P Target Date To Retirement Income Index 1 8.73 4.36 4.08 S&P 500 Index 22.15 15.00 13.15	[428]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 203,864,636
Holdings Count | $ / shares	7	[429]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $203,864,636 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 8%	[429]
Holdings [Text Block]		[430]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R5
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement Maturity Fund
Class Name	Class R5
Trading Symbol	PACQX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement Maturity Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R5 1 $18 0.17%	[431],[432]
Expenses Paid, Amount	$ 18	[431]
Expense Ratio, Percent	0.17%	[431]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R5 shares of Putnam Sustainable Retirement Maturity Fund returned 11.20%. The Fund compares its performance to the S&P Target Date To Retirement Income Index, which returned 8.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R5 11.20 2.84 2.92 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 Russell 3000 Index 21.07 14.23 12.58 S&P Target Date To Retirement Income Index 1 8.73 4.36 4.08 S&P 500 Index 22.15 15.00 13.15	[433]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 203,864,636
Holdings Count | $ / shares	7	[434]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $203,864,636 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 8%	[434]
Holdings [Text Block]		[435]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class R6
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement Maturity Fund
Class Name	Class R6
Trading Symbol	PREWX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement Maturity Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class R6 1 $7 0.07%	[436],[437]
Expenses Paid, Amount	$ 7	[436]
Expense Ratio, Percent	0.07%	[436]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class R6 shares of Putnam Sustainable Retirement Maturity Fund returned 11.32%. The Fund compares its performance to the S&P Target Date To Retirement Income Index, which returned 8.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class R6 11.32 2.94 3.01 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 Russell 3000 Index 21.07 14.23 12.58 S&P Target Date To Retirement Income Index 1 8.73 4.36 4.08 S&P 500 Index 22.15 15.00 13.15	[438]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 203,864,636
Holdings Count | $ / shares	7	[439]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $203,864,636 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 8%	[439]
Holdings [Text Block]		[440]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
Class Y
Shareholder Report [Line Items]
Fund Name	Putnam Sustainable Retirement Maturity Fund
Class Name	Class Y
Trading Symbol	PRMYX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Putnam Sustainable Retirement Maturity Fund for the period August 1, 2023, to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) 225-1581 .
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	(800) 225-1581
Additional Information Website	https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]	WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * Class Y 1 $18 0.17%	[441],[442]
Expenses Paid, Amount	$ 18	[441]
Expense Ratio, Percent	0.17%	[441]
Factors Affecting Performance [Text Block]	HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended July 31, 2024, Class Y shares of Putnam Sustainable Retirement Maturity Fund returned 11.19%. The Fund compares its performance to the S&P Target Date To Retirement Income Index, which returned 8.73% for the same period. The Fund previously compared its performance to the S&P 500 Index and the Bloomberg U.S. Aggregate Index, which returned 22.15% and 5.10%, respectively, for the same period. Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. PERFORMANCE HIGHLIGHTS Top contributors to performance: Selection effects within these underlying funds: ↑ Putnam Sustainable Leaders ETF ↑ Putnam Sustainable Future ETF ↑ Putnam ESG Core Bond ETF Top detractors from performance: ↓ Selection and allocation effects within the underlying fund, Putnam ESG High Yield ETF ↓ An allocation to cash
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended July 31, 2024 1 Year 5 Year 10 Year Class Y 11.19 2.84 2.93 Bloomberg U.S. Aggregate Index 5.10 0.19 1.61 Russell 3000 Index 21.07 14.23 12.58 S&P Target Date To Retirement Income Index 1 8.73 4.36 4.08 S&P 500 Index 22.15 15.00 13.15	[443]
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]	For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/mutual-funds . Important data provider notices and terms available at www.franklintempletondatasources.com.
Net Assets	$ 203,864,636
Holdings Count | $ / shares	7	[444]
Advisory Fees Paid, Amount	$ 0
Investment Company Portfolio Turnover	8%
Additional Fund Statistics [Text Block]	KEY FUND STATISTICS (as of July 31, 2024) Total Net Assets $203,864,636 Total Number of Portfolio Holdings * 7 Total Management Fee Paid $0 Portfolio Turnover Rate 8%	[444]
Holdings [Text Block]		[445]
Material Fund Change [Text Block]	HOW HAS THE FUND CHANGED? On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes. Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement. This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements at https://www.franklintempleton.com/regulatory-fund-documents  or upon request at (800) 225-1581 or funddocuments putnam.com .
Updated Prospectus Phone Number	(800) 225-1581
Updated Prospectus Email Address	funddocuments@putnam.com
Updated Prospectus Web Address	https://www.franklintempleton.com/regulatory-fund-documents
[1] 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represents temporary investments in the Putnam Government Money Market Fund and any cash or cash equivalents. Holdings and allocations may vary over time. 1 Excludes fees and expenses of the underlying funds in which the Fund invests. * Reflects waiver of fees and/or reimbursement of expenses (including acquired fund fees and expenses), without which expenses would be higher. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. * Includes derivatives, if applicable. Short-Term Fund and Cash Equivalents, if any, represe

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details) - USD ($)		12 Months Ended
		Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Class A
Account Value [Line Items]
Line Graph and Table Measure Name		Class A (with sales charge)
Account Value		$ 13,185	$ 10,782	$ 9,681	$ 10,688
Class C
Account Value [Line Items]
Line Graph and Table Measure Name		Class C (with sales charge)
Account Value		$ 13,626	11,225	10,155	11,290
Class R
Account Value [Line Items]
Line Graph and Table Measure Name		Class R
Account Value		$ 13,791	11,324	10,200	11,320
Class R3
Account Value [Line Items]
Line Graph and Table Measure Name		Class R3
Account Value		$ 13,921	11,401	10,244	11,330
Class R4
Account Value [Line Items]
Line Graph and Table Measure Name		Class R4
Account Value		$ 14,045	11,469	10,289	11,350
Class R5
Account Value [Line Items]
Line Graph and Table Measure Name		Class R5
Account Value		$ 14,115	11,514	10,314	11,360
Class R6
Account Value [Line Items]
Line Graph and Table Measure Name		Class R6
Account Value		$ 14,171	11,539	10,325	11,360
Class Y
Account Value [Line Items]
Line Graph and Table Measure Name		Class Y
Account Value		$ 14,117	11,516	10,314	11,360
Class A
Account Value [Line Items]
Line Graph and Table Measure Name		Class A (with sales charge)
Account Value		$ 20,536	16,871	15,160	16,738	$ 12,953	$ 12,240	$ 12,153	$ 10,921	$ 9,481
Class B
Account Value [Line Items]
Line Graph and Table Measure Name		Class B (with sales charge)
Account Value		$ 20,539	16,900	15,301	17,016	13,273	12,633	12,642	11,436	10,012
Class C
Account Value [Line Items]
Line Graph and Table Measure Name		Class C (with sales charge)
Account Value		$ 20,522	16,900	15,300	17,024	13,270	12,630	12,637	11,445	10,012
Class R
Account Value [Line Items]
Line Graph and Table Measure Name		Class R
Account Value		$ 21,215	17,485	15,783	17,494	13,576	12,869	12,803	11,537	10,047
Class R3
Account Value [Line Items]
Line Graph and Table Measure Name		Class R3
Account Value		$ 21,605	17,768	15,997	17,681	13,685	12,948	12,857	11,572	10,054
Class R4
Account Value [Line Items]
Line Graph and Table Measure Name		Class R4
Account Value		$ 22,086	18,116	16,265	17,936	13,851	13,069	12,947	11,618	10,072
Class R5
Account Value [Line Items]
Line Graph and Table Measure Name		Class R5
Account Value		$ 22,349	18,307	16,412	18,071	13,946	13,133	12,999	11,637	10,082
Class R6
Account Value [Line Items]
Line Graph and Table Measure Name		Class R6
Account Value		$ 22,429	18,359	16,443	18,084	13,946	13,133	12,999	11,637	10,082
Class Y
Account Value [Line Items]
Line Graph and Table Measure Name		Class Y
Account Value		$ 22,287	18,239	16,354	18,018	13,896	13,100	12,969	11,636	10,082
Class A
Account Value [Line Items]
Line Graph and Table Measure Name		Class A (with sales charge)
Account Value		$ 21,437	17,704	16,014	17,662	13,779	13,057	12,963	11,673	10,143	$ 10,326	$ 9,425
Class B
Account Value [Line Items]
Line Graph and Table Measure Name		Class B (with sales charge)
Account Value		$ 21,442	17,708	16,018	17,782	13,992	13,361	13,353	12,111	10,607	10,881	10,000
Class C
Account Value [Line Items]
Line Graph and Table Measure Name		Class C (with sales charge)
Account Value		$ 21,423	17,692	16,003	17,784	13,985	13,353	13,350	12,109	10,611	10,881	10,000
Class R
Account Value [Line Items]
Line Graph and Table Measure Name		Class R
Account Value		$ 22,067	18,307	16,618	18,396	14,404	13,684	13,623	12,288	10,715	10,934	10,000
Class R3
Account Value [Line Items]
Line Graph and Table Measure Name		Class R3
Account Value		$ 22,575	18,686	16,926	18,685	14,598	13,836	13,741	12,374	10,767	10,957	10,000
Class R4
Account Value [Line Items]
Line Graph and Table Measure Name		Class R4
Account Value		$ 23,136	19,097	17,261	19,009	14,816	14,004	13,870	12,465	10,814	10,979	10,000
Class R5
Account Value [Line Items]
Line Graph and Table Measure Name		Class R5
Account Value		$ 23,454	19,325	17,441	19,176	14,922	14,093	13,941	12,497	10,824	10,989	10,000
Class R6
Account Value [Line Items]
Line Graph and Table Measure Name		Class R6
Account Value		$ 23,537	19,381	17,458	19,190	14,922	14,093	13,941	12,497	10,824	10,989	10,000
Class Y
Account Value [Line Items]
Line Graph and Table Measure Name		Class Y
Account Value		$ 23,336	19,236	17,348	19,079	14,857	14,043	13,903	12,486	10,824	10,989	10,000
Class A
Account Value [Line Items]
Line Graph and Table Measure Name		Class A (with sales charge)
Account Value		$ 20,844	17,330	15,764	17,354	13,699	13,007	12,895	11,635	10,155	10,314	9,425
Class B
Account Value [Line Items]
Line Graph and Table Measure Name		Class B (with sales charge)
Account Value		$ 20,834	17,322	15,757	17,473	13,894	13,293	13,275	12,079	10,614	10,865	10,000
Class C
Account Value [Line Items]
Line Graph and Table Measure Name		Class C (with sales charge)
Account Value		$ 20,834	17,322	15,757	17,470	13,896	13,291	13,275	12,076	10,610	10,858	10,000
Class R
Account Value [Line Items]
Line Graph and Table Measure Name		Class R
Account Value		$ 21,480	17,931	16,372	18,092	14,327	13,643	13,550	12,262	10,724	10,922	10,000
Class R3
Account Value [Line Items]
Line Graph and Table Measure Name		Class R3
Account Value		$ 21,932	18,255	16,633	18,338	14,494	13,773	13,651	12,327	10,763	10,936	10,000
Class R4
Account Value [Line Items]
Line Graph and Table Measure Name		Class R4
Account Value		$ 22,480	18,677	16,970	18,664	14,715	13,945	13,795	12,422	10,819	10,968	10,000
Class R5
Account Value [Line Items]
Line Graph and Table Measure Name		Class R5
Account Value		$ 22,769	18,881	17,134	18,818	14,808	14,016	13,845	12,457	10,826	10,969	10,000
Class R6
Account Value [Line Items]
Line Graph and Table Measure Name		Class R6
Account Value		$ 22,844	18,929	17,159	18,826	14,808	14,016	13,845	12,457	10,826	10,969	10,000
Class Y
Account Value [Line Items]
Line Graph and Table Measure Name		Class Y
Account Value		$ 22,682	18,805	17,073	18,738	14,758	13,979	13,817	12,440	10,826	10,969	10,000
Class A
Account Value [Line Items]
Line Graph and Table Measure Name		Class A (with sales charge)
Account Value		$ 20,028	16,761	15,368	16,804	13,536	12,922	12,793	11,593	10,161	10,287	9,425
Class B
Account Value [Line Items]
Line Graph and Table Measure Name		Class B (with sales charge)
Account Value		$ 20,017	16,751	15,359	16,919	13,733	13,207	13,171	12,030	10,618	10,831	10,000
Class C
Account Value [Line Items]
Line Graph and Table Measure Name		Class C (with sales charge)
Account Value		$ 20,015	16,751	15,358	16,923	13,732	13,208	13,173	12,031	10,626	10,833	10,000
Class R
Account Value [Line Items]
Line Graph and Table Measure Name		Class R
Account Value		$ 20,617	17,319	15,946	17,508	14,154	13,534	13,437	12,209	10,724	10,883	10,000
Class R3
Account Value [Line Items]
Line Graph and Table Measure Name		Class R3
Account Value		$ 21,084	17,668	16,220	17,764	14,312	13,671	13,545	12,283	10,768	10,909	10,000
Class R4
Account Value [Line Items]
Line Graph and Table Measure Name		Class R4
Account Value		$ 21,616	18,077	16,550	18,081	14,532	13,842	13,679	12,375	10,823	10,935	10,000
Class R5
Account Value [Line Items]
Line Graph and Table Measure Name		Class R5
Account Value		$ 21,890	18,279	16,711	18,222	14,643	13,931	13,745	12,411	10,837	10,941	10,000
Class R6
Account Value [Line Items]
Line Graph and Table Measure Name		Class R6
Account Value		$ 21,969	18,316	16,734	18,234	14,643	13,931	13,745	12,411	10,837	10,941	10,000
Class Y
Account Value [Line Items]
Line Graph and Table Measure Name		Class Y
Account Value		$ 21,810	18,211	16,648	18,162	14,583	13,885	13,712	12,400	10,837	10,941	10,000
Class A
Account Value [Line Items]
Line Graph and Table Measure Name		Class A (with sales charge)
Account Value		$ 18,824	15,907	14,718	15,928	13,245	12,731	12,564	11,489	10,155	10,241	9,425
Class B
Account Value [Line Items]
Line Graph and Table Measure Name		Class B (with sales charge)
Account Value		$ 18,815	15,899	14,711	16,043	13,438	13,017	12,937	11,921	10,620	10,792	10,000
Class C
Account Value [Line Items]
Line Graph and Table Measure Name		Class C (with sales charge)
Account Value		$ 18,816	15,900	14,712	16,038	13,434	13,014	12,941	11,918	10,616	10,791	10,000
Class R
Account Value [Line Items]
Line Graph and Table Measure Name		Class R
Account Value		$ 19,385	16,446	15,276	16,599	13,847	13,348	13,201	12,101	10,722	10,845	10,000
Class R3
Account Value [Line Items]
Line Graph and Table Measure Name		Class R3
Account Value		$ 19,755	16,719	15,492	16,789	13,969	13,451	13,282	12,158	10,757	10,860	10,000
Class R4
Account Value [Line Items]
Line Graph and Table Measure Name		Class R4
Account Value		$ 20,256	17,096	15,806	17,086	14,186	13,619	13,415	12,249	10,812	10,889	10,000
Class R5
Account Value [Line Items]
Line Graph and Table Measure Name		Class R5
Account Value		$ 20,540	17,310	15,982	17,248	14,300	13,703	13,481	12,284	10,827	10,892	10,000
Class R6
Account Value [Line Items]
Line Graph and Table Measure Name		Class R6
Account Value		$ 20,631	17,372	16,016	17,273	14,312	13,714	13,488	12,290	10,831	10,896	10,000
Class Y
Account Value [Line Items]
Line Graph and Table Measure Name		Class Y
Account Value		$ 20,477	17,262	15,934	17,198	14,261	13,681	13,464	12,283	10,831	10,896	10,000
Class A
Account Value [Line Items]
Line Graph and Table Measure Name		Class A (with sales charge)
Account Value		$ 17,259	14,793	13,885	14,840	12,826	12,438	12,203	11,305	10,130	10,185	9,425
Class B
Account Value [Line Items]
Line Graph and Table Measure Name		Class B (with sales charge)
Account Value		$ 17,246	14,782	13,874	14,947	13,008	12,713	12,566	11,730	10,590	10,728	10,000
Class C
Account Value [Line Items]
Line Graph and Table Measure Name		Class C (with sales charge)
Account Value		$ 17,248	14,784	13,876	14,944	13,012	12,710	12,570	11,728	10,592	10,730	10,000
Class R
Account Value [Line Items]
Line Graph and Table Measure Name		Class R
Account Value		$ 17,773	15,291	14,408	15,464	13,410	13,037	12,825	11,909	10,700	10,786	10,000
Class R3
Account Value [Line Items]
Line Graph and Table Measure Name		Class R3
Account Value		$ 18,102	15,535	14,601	15,630	13,517	13,119	12,894	11,951	10,725	10,798	10,000
Class R4
Account Value [Line Items]
Line Graph and Table Measure Name		Class R4
Account Value		$ 18,551	15,881	14,888	15,899	13,715	13,281	13,020	12,037	10,776	10,823	10,000
Class R5
Account Value [Line Items]
Line Graph and Table Measure Name		Class R5
Account Value		$ 18,806	16,079	15,048	16,050	13,829	13,374	13,085	12,083	10,790	10,830	10,000
Class R6
Account Value [Line Items]
Line Graph and Table Measure Name		Class R6
Account Value		$ 18,921	16,158	15,113	16,096	13,864	13,398	13,105	12,095	10,800	10,835	10,000
Class Y
Account Value [Line Items]
Line Graph and Table Measure Name		Class Y
Account Value		$ 18,785	16,057	15,032	16,032	13,809	13,357	13,078	12,080	10,800	10,835	10,000
Class A
Account Value [Line Items]
Line Graph and Table Measure Name		Class A (with sales charge)
Account Value		$ 15,371	13,536	12,943	13,677	12,329	12,073	11,764	11,059	10,089	10,135	9,425
Class B
Account Value [Line Items]
Line Graph and Table Measure Name		Class B (with sales charge)
Account Value		$ 15,357	13,525	12,932	13,767	12,503	12,336	12,117	11,468	10,545	10,671	10,000
Class C
Account Value [Line Items]
Line Graph and Table Measure Name		Class C (with sales charge)
Account Value		$ 15,362	13,529	12,937	13,770	12,502	12,335	12,115	11,470	10,541	10,668	10,000
Class R
Account Value [Line Items]
Line Graph and Table Measure Name		Class R
Account Value		$ 15,824	13,982	13,428	14,248	12,880	12,649	12,357	11,645	10,646	10,722	10,000
Class R3
Account Value [Line Items]
Line Graph and Table Measure Name		Class R3
Account Value		$ 16,086	14,183	13,588	14,376	12,973	12,725	12,417	11,683	10,673	10,731	10,000
Class R4
Account Value [Line Items]
Line Graph and Table Measure Name		Class R4
Account Value		$ 16,499	14,506	13,867	14,632	13,169	12,887	12,541	11,769	10,725	10,761	10,000
Class R5
Account Value [Line Items]
Line Graph and Table Measure Name		Class R5
Account Value		$ 16,714	14,678	14,009	14,763	13,270	12,959	12,598	11,807	10,740	10,769	10,000
Class R6
Account Value [Line Items]
Line Graph and Table Measure Name		Class R6
Account Value		$ 16,842	14,777	14,083	14,826	13,317	13,000	12,629	11,830	10,755	10,776	10,000
Class Y
Account Value [Line Items]
Line Graph and Table Measure Name		Class Y
Account Value		$ 16,726	14,683	14,013	14,767	13,275	12,971	12,609	11,818	10,755	10,776	10,000
Class A
Account Value [Line Items]
Line Graph and Table Measure Name		Class A (with sales charge)
Account Value		$ 13,724	12,318	11,966	12,527	11,760	11,617	11,280	10,780	10,018	10,058	9,425
Class B
Account Value [Line Items]
Line Graph and Table Measure Name		Class B (with sales charge)
Account Value		$ 13,707	12,304	11,952	12,606	11,923	11,874	11,616	11,180	10,467	10,591	10,000
Class C
Account Value [Line Items]
Line Graph and Table Measure Name		Class C (with sales charge)
Account Value		$ 13,716	12,311	11,960	12,612	11,927	11,873	11,617	11,181	10,466	10,590	10,000
Class R
Account Value [Line Items]
Line Graph and Table Measure Name		Class R
Account Value		$ 14,122	12,722	12,412	13,042	12,283	12,167	11,847	11,349	10,569	10,642	10,000
Class R3
Account Value [Line Items]
Line Graph and Table Measure Name		Class R3
Account Value		$ 14,348	12,900	12,554	13,158	12,368	12,235	11,899	11,385	10,596	10,654	10,000
Class R4
Account Value [Line Items]
Line Graph and Table Measure Name		Class R4
Account Value		$ 14,710	13,189	12,798	13,384	12,547	12,383	12,015	11,469	10,643	10,677	10,000
Class R5
Account Value [Line Items]
Line Graph and Table Measure Name		Class R5
Account Value		$ 14,923	13,357	12,947	13,517	12,658	12,472	12,077	11,508	10,665	10,685	10,000
Class R6
Account Value [Line Items]
Line Graph and Table Measure Name		Class R6
Account Value		$ 15,038	13,449	13,023	13,588	12,708	12,515	12,109	11,533	10,676	10,692	10,000
Class Y
Account Value [Line Items]
Line Graph and Table Measure Name		Class Y
Account Value		$ 14,923	13,362	12,951	13,520	12,657	12,475	12,084	11,519	10,676	10,692	10,000
Class A
Account Value [Line Items]
Line Graph and Table Measure Name		Class A (with sales charge)
Account Value		$ 12,502	11,266	10,912	11,355	11,025	11,004	10,647	10,401	9,911	9,938	9,600
Class B
Account Value [Line Items]
Line Graph and Table Measure Name		Class B (with sales charge)
Account Value		$ 12,258	11,046	10,699	11,218	10,974	11,031	10,759	10,585	10,166	10,268	10,000
Class C
Account Value [Line Items]
Line Graph and Table Measure Name		Class C (with sales charge)
Account Value		$ 12,257	11,045	10,698	11,215	10,972	11,036	10,755	10,589	10,172	10,268	10,000
Class R
Account Value [Line Items]
Line Graph and Table Measure Name		Class R
Account Value		$ 12,630	11,431	11,113	11,610	11,306	11,313	10,980	10,754	10,271	10,326	10,000
Class R3
Account Value [Line Items]
Line Graph and Table Measure Name		Class R3
Account Value		$ 12,816	11,571	11,217	11,696	11,380	11,371	11,016	10,778	10,290	10,334	10,000
Class R4
Account Value [Line Items]
Line Graph and Table Measure Name		Class R4
Account Value		$ 13,151	11,840	11,454	11,907	11,554	11,519	11,132	10,867	10,347	10,365	10,000
Class R5
Account Value [Line Items]
Line Graph and Table Measure Name		Class R5
Account Value		$ 13,335	11,991	11,582	12,021	11,637	11,591	11,185	10,897	10,359	10,366	10,000
Class R6
Account Value [Line Items]
Line Graph and Table Measure Name		Class R6
Account Value		$ 13,448	12,080	11,657	12,087	11,692	11,632	11,219	10,923	10,376	10,378	10,000
Class Y
Account Value [Line Items]
Line Graph and Table Measure Name		Class Y
Account Value		$ 13,346	12,003	11,593	12,033	11,657	11,601	11,199	10,912	10,376	10,378	10,000
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 14,791	12,217	10,845	11,706
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 9,184	8,738	9,043	9,950
S&P Target Date To 2065+ Index
Account Value [Line Items]
Line Graph and Table Measure Name	[1]	S&P Target Date To 2065+ Index1
Account Value		$ 13,311	11,492	10,293	11,281
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 15,532	12,716	11,252	11,799
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 14,791	12,217	10,845	11,706
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 9,184	8,738	9,043	9,950
S&P Target Date To 2065+ Index
Account Value [Line Items]
Line Graph and Table Measure Name	[2]	S&P Target Date To 2065+ Index1
Account Value		$ 13,311	11,492	10,293	11,281
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 15,532	12,716	11,252	11,799
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 14,791	12,217	10,845	11,706
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 9,184	8,738	9,043	9,950
S&P Target Date To 2065+ Index
Account Value [Line Items]
Line Graph and Table Measure Name	[3]	S&P Target Date To 2065+ Index1
Account Value		$ 13,311	11,492	10,293	11,281
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 15,532	12,716	11,252	11,799
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 14,791	12,217	10,845	11,706
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 9,184	8,738	9,043	9,950
S&P Target Date To 2065+ Index
Account Value [Line Items]
Line Graph and Table Measure Name	[4]	S&P Target Date To 2065+ Index1
Account Value		$ 13,311	11,492	10,293	11,281
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 15,532	12,716	11,252	11,799
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 14,791	12,217	10,845	11,706
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 9,184	8,738	9,043	9,950
S&P Target Date To 2065+ Index
Account Value [Line Items]
Line Graph and Table Measure Name	[5]	S&P Target Date To 2065+ Index1
Account Value		$ 13,311	11,492	10,293	11,281
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 15,532	12,716	11,252	11,799
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 14,791	12,217	10,845	11,706
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 9,184	8,738	9,043	9,950
S&P Target Date To 2065+ Index
Account Value [Line Items]
Line Graph and Table Measure Name	[6]	S&P Target Date To 2065+ Index1
Account Value		$ 13,311	11,492	10,293	11,281
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 15,532	12,716	11,252	11,799
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 14,791	12,217	10,845	11,706
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 9,184	8,738	9,043	9,950
S&P Target Date To 2065+ Index
Account Value [Line Items]
Line Graph and Table Measure Name	[7]	S&P Target Date To 2065+ Index1
Account Value		$ 13,311	11,492	10,293	11,281
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 15,532	12,716	11,252	11,799
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 14,791	12,217	10,845	11,706
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 9,184	8,738	9,043	9,950
S&P Target Date To 2065+ Index
Account Value [Line Items]
Line Graph and Table Measure Name	[8]	S&P Target Date To 2065+ Index1
Account Value		$ 13,311	11,492	10,293	11,281
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 15,532	12,716	11,252	11,799
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 29,693	24,525	21,771	23,498	16,939	15,270	14,264	12,255	10,553
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,373	10,821	11,198	12,321	12,408	11,268	10,425	10,509	10,564
S&P Target Date To 2060 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[9]	S&P Target Date To 2060 Index1
Account Value		$ 22,320	19,333	17,260	18,920	14,371	13,711	13,301	11,988	10,432
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 31,039	25,411	22,485	23,579	17,281	15,435	14,294	12,297	10,597
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 29,693	24,525	21,771	23,498	16,939	15,270	14,264	12,255	10,553
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,373	10,821	11,198	12,321	12,408	11,268	10,425	10,509	10,564
S&P Target Date To 2060 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[10]	S&P Target Date To 2060 Index1
Account Value		$ 22,320	19,333	17,260	18,920	14,371	13,711	13,301	11,988	10,432
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 31,039	25,411	22,485	23,579	17,281	15,435	14,294	12,297	10,597
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 29,693	24,525	21,771	23,498	16,939	15,270	14,264	12,255	10,553
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,373	10,821	11,198	12,321	12,408	11,268	10,425	10,509	10,564
S&P Target Date To 2060 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[11]	S&P Target Date To 2060 Index1
Account Value		$ 22,320	19,333	17,260	18,920	14,371	13,711	13,301	11,988	10,432
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 31,039	25,411	22,485	23,579	17,281	15,435	14,294	12,297	10,597
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 29,693	24,525	21,771	23,498	16,939	15,270	14,264	12,255	10,553
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,373	10,821	11,198	12,321	12,408	11,268	10,425	10,509	10,564
S&P Target Date To 2060 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[12]	S&P Target Date To 2060 Index1
Account Value		$ 22,320	19,333	17,260	18,920	14,371	13,711	13,301	11,988	10,432
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 31,039	25,411	22,485	23,579	17,281	15,435	14,294	12,297	10,597
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 29,693	24,525	21,771	23,498	16,939	15,270	14,264	12,255	10,553
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,373	10,821	11,198	12,321	12,408	11,268	10,425	10,509	10,564
S&P Target Date To 2060 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[13]	S&P Target Date To 2060 Index1
Account Value		$ 22,320	19,333	17,260	18,920	14,371	13,711	13,301	11,988	10,432
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 31,039	25,411	22,485	23,579	17,281	15,435	14,294	12,297	10,597
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 29,693	24,525	21,771	23,498	16,939	15,270	14,264	12,255	10,553
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,373	10,821	11,198	12,321	12,408	11,268	10,425	10,509	10,564
S&P Target Date To 2060 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[14]	S&P Target Date To 2060 Index1
Account Value		$ 22,320	19,333	17,260	18,920	14,371	13,711	13,301	11,988	10,432
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 31,039	25,411	22,485	23,579	17,281	15,435	14,294	12,297	10,597
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 29,693	24,525	21,771	23,498	16,939	15,270	14,264	12,255	10,553
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,373	10,821	11,198	12,321	12,408	11,268	10,425	10,509	10,564
S&P Target Date To 2060 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[15]	S&P Target Date To 2060 Index1
Account Value		$ 22,320	19,333	17,260	18,920	14,371	13,711	13,301	11,988	10,432
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 31,039	25,411	22,485	23,579	17,281	15,435	14,294	12,297	10,597
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 29,693	24,525	21,771	23,498	16,939	15,270	14,264	12,255	10,553
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,373	10,821	11,198	12,321	12,408	11,268	10,425	10,509	10,564
S&P Target Date To 2060 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[16]	S&P Target Date To 2060 Index1
Account Value		$ 22,320	19,333	17,260	18,920	14,371	13,711	13,301	11,988	10,432
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 31,039	25,411	22,485	23,579	17,281	15,435	14,294	12,297	10,597
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 29,693	24,525	21,771	23,498	16,939	15,270	14,264	12,255	10,553
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,373	10,821	11,198	12,321	12,408	11,268	10,425	10,509	10,564
S&P Target Date To 2060 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[17]	S&P Target Date To 2060 Index1
Account Value		$ 22,320	19,333	17,260	18,920	14,371	13,711	13,301	11,988	10,432
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 31,039	25,411	22,485	23,579	17,281	15,435	14,294	12,297	10,597
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2055 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[18]	S&P Target Date To 2055 Index1
Account Value		$ 22,481	19,479	17,424	19,095	14,529	13,954	13,552	12,233	10,695	10,511	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2055 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[19]	S&P Target Date To 2055 Index1
Account Value		$ 22,481	19,479	17,424	19,095	14,529	13,954	13,552	12,233	10,695	10,511	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2055 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[20]	S&P Target Date To 2055 Index1
Account Value		$ 22,481	19,479	17,424	19,095	14,529	13,954	13,552	12,233	10,695	10,511	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2055 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[21]	S&P Target Date To 2055 Index1
Account Value		$ 22,481	19,479	17,424	19,095	14,529	13,954	13,552	12,233	10,695	10,511	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2055 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[22]	S&P Target Date To 2055 Index1
Account Value		$ 22,481	19,479	17,424	19,095	14,529	13,954	13,552	12,233	10,695	10,511	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2055 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[23]	S&P Target Date To 2055 Index1
Account Value		$ 22,481	19,479	17,424	19,095	14,529	13,954	13,552	12,233	10,695	10,511	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2055 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[24]	S&P Target Date To 2055 Index1
Account Value		$ 22,481	19,479	17,424	19,095	14,529	13,954	13,552	12,233	10,695	10,511	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2055 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[25]	S&P Target Date To 2055 Index1
Account Value		$ 22,481	19,479	17,424	19,095	14,529	13,954	13,552	12,233	10,695	10,511	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2055 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[26]	S&P Target Date To 2055 Index1
Account Value		$ 22,481	19,479	17,424	19,095	14,529	13,954	13,552	12,233	10,695	10,511	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2050 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[27]	S&P Target Date To 2050 Index1
Account Value		$ 22,379	19,383	17,351	19,008	14,536	13,894	13,472	12,190	10,705	10,500	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2050 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[28]	S&P Target Date To 2050 Index1
Account Value		$ 22,379	19,383	17,351	19,008	14,536	13,894	13,472	12,190	10,705	10,500	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2050 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[29]	S&P Target Date To 2050 Index1
Account Value		$ 22,379	19,383	17,351	19,008	14,536	13,894	13,472	12,190	10,705	10,500	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2050 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[30]	S&P Target Date To 2050 Index1
Account Value		$ 22,379	19,383	17,351	19,008	14,536	13,894	13,472	12,190	10,705	10,500	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2050 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[31]	S&P Target Date To 2050 Index1
Account Value		$ 22,379	19,383	17,351	19,008	14,536	13,894	13,472	12,190	10,705	10,500	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2050 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[32]	S&P Target Date To 2050 Index1
Account Value		$ 22,379	19,383	17,351	19,008	14,536	13,894	13,472	12,190	10,705	10,500	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2050 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[33]	S&P Target Date To 2050 Index1
Account Value		$ 22,379	19,383	17,351	19,008	14,536	13,894	13,472	12,190	10,705	10,500	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2050 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[34]	S&P Target Date To 2050 Index1
Account Value		$ 22,379	19,383	17,351	19,008	14,536	13,894	13,472	12,190	10,705	10,500	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2050 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[35]	S&P Target Date To 2050 Index1
Account Value		$ 22,379	19,383	17,351	19,008	14,536	13,894	13,472	12,190	10,705	10,500	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2045 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[36]	S&P Target Date To 2045 Index1
Account Value		$ 21,788	18,991	17,098	18,708	14,420	13,812	13,379	12,130	10,716	10,491	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2045 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[37]	S&P Target Date To 2045 Index1
Account Value		$ 21,788	18,991	17,098	18,708	14,420	13,812	13,379	12,130	10,716	10,491	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2045 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[38]	S&P Target Date To 2045 Index1
Account Value		$ 21,788	18,991	17,098	18,708	14,420	13,812	13,379	12,130	10,716	10,491	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2045 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[39]	S&P Target Date To 2045 Index1
Account Value		$ 21,788	18,991	17,098	18,708	14,420	13,812	13,379	12,130	10,716	10,491	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2045 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[40]	S&P Target Date To 2045 Index1
Account Value		$ 21,788	18,991	17,098	18,708	14,420	13,812	13,379	12,130	10,716	10,491	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2045 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[41]	S&P Target Date To 2045 Index1
Account Value		$ 21,788	18,991	17,098	18,708	14,420	13,812	13,379	12,130	10,716	10,491	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2045 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[42]	S&P Target Date To 2045 Index1
Account Value		$ 21,788	18,991	17,098	18,708	14,420	13,812	13,379	12,130	10,716	10,491	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2045 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[43]	S&P Target Date To 2045 Index1
Account Value		$ 21,788	18,991	17,098	18,708	14,420	13,812	13,379	12,130	10,716	10,491	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2045 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[44]	S&P Target Date To 2045 Index1
Account Value		$ 21,788	18,991	17,098	18,708	14,420	13,812	13,379	12,130	10,716	10,491	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2040 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[45]	S&P Target Date To 2040 Index1
Account Value		$ 20,964	18,413	16,787	18,315	14,377	13,691	13,252	12,059	10,724	10,479	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2040 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[46]	S&P Target Date To 2040 Index1
Account Value		$ 20,964	18,413	16,787	18,315	14,377	13,691	13,252	12,059	10,724	10,479	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2040 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[47]	S&P Target Date To 2040 Index1
Account Value		$ 20,964	18,413	16,787	18,315	14,377	13,691	13,252	12,059	10,724	10,479	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2040 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[48]	S&P Target Date To 2040 Index1
Account Value		$ 20,964	18,413	16,787	18,315	14,377	13,691	13,252	12,059	10,724	10,479	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2040 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[49]	S&P Target Date To 2040 Index1
Account Value		$ 20,964	18,413	16,787	18,315	14,377	13,691	13,252	12,059	10,724	10,479	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2040 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[50]	S&P Target Date To 2040 Index1
Account Value		$ 20,964	18,413	16,787	18,315	14,377	13,691	13,252	12,059	10,724	10,479	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2040 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[51]	S&P Target Date To 2040 Index1
Account Value		$ 20,964	18,413	16,787	18,315	14,377	13,691	13,252	12,059	10,724	10,479	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2040 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[52]	S&P Target Date To 2040 Index1
Account Value		$ 20,964	18,413	16,787	18,315	14,377	13,691	13,252	12,059	10,724	10,479	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2040 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[53]	S&P Target Date To 2040 Index1
Account Value		$ 20,964	18,413	16,787	18,315	14,377	13,691	13,252	12,059	10,724	10,479	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2035 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[54]	S&P Target Date To 2035 Index1
Account Value		$ 19,868	17,624	16,286	17,729	14,254	13,460	12,993	11,932	10,728	10,464	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2035 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[55]	S&P Target Date To 2035 Index1
Account Value		$ 19,868	17,624	16,286	17,729	14,254	13,460	12,993	11,932	10,728	10,464	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2035 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[56]	S&P Target Date To 2035 Index1
Account Value		$ 19,868	17,624	16,286	17,729	14,254	13,460	12,993	11,932	10,728	10,464	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2035 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[57]	S&P Target Date To 2035 Index1
Account Value		$ 19,868	17,624	16,286	17,729	14,254	13,460	12,993	11,932	10,728	10,464	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2035 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[58]	S&P Target Date To 2035 Index1
Account Value		$ 19,868	17,624	16,286	17,729	14,254	13,460	12,993	11,932	10,728	10,464	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2035 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[59]	S&P Target Date To 2035 Index1
Account Value		$ 19,868	17,624	16,286	17,729	14,254	13,460	12,993	11,932	10,728	10,464	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2035 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[60]	S&P Target Date To 2035 Index1
Account Value		$ 19,868	17,624	16,286	17,729	14,254	13,460	12,993	11,932	10,728	10,464	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2035 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[61]	S&P Target Date To 2035 Index1
Account Value		$ 19,868	17,624	16,286	17,729	14,254	13,460	12,993	11,932	10,728	10,464	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2035 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[62]	S&P Target Date To 2035 Index1
Account Value		$ 19,868	17,624	16,286	17,729	14,254	13,460	12,993	11,932	10,728	10,464	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2030 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[63]	S&P Target Date To 2030 Index1
Account Value		$ 18,620	16,721	15,674	17,005	14,124	13,270	12,752	11,836	10,747	10,444	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2030 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[64]	S&P Target Date To 2030 Index1
Account Value		$ 18,620	16,721	15,674	17,005	14,124	13,270	12,752	11,836	10,747	10,444	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2030 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[65]	S&P Target Date To 2030 Index1
Account Value		$ 18,620	16,721	15,674	17,005	14,124	13,270	12,752	11,836	10,747	10,444	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2030 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[66]	S&P Target Date To 2030 Index1
Account Value		$ 18,620	16,721	15,674	17,005	14,124	13,270	12,752	11,836	10,747	10,444	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2030 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[67]	S&P Target Date To 2030 Index1
Account Value		$ 18,620	16,721	15,674	17,005	14,124	13,270	12,752	11,836	10,747	10,444	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2030 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[68]	S&P Target Date To 2030 Index1
Account Value		$ 18,620	16,721	15,674	17,005	14,124	13,270	12,752	11,836	10,747	10,444	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2030 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[69]	S&P Target Date To 2030 Index1
Account Value		$ 18,620	16,721	15,674	17,005	14,124	13,270	12,752	11,836	10,747	10,444	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2030 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[70]	S&P Target Date To 2030 Index1
Account Value		$ 18,620	16,721	15,674	17,005	14,124	13,270	12,752	11,836	10,747	10,444	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2030 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[71]	S&P Target Date To 2030 Index1
Account Value		$ 18,620	16,721	15,674	17,005	14,124	13,270	12,752	11,836	10,747	10,444	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,546	12,705	12,794	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2025 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[72]	S&P Target Date To 2025 Index1
Account Value		$ 17,299	15,724	14,952	16,159	13,904	13,000	12,440	11,687	10,741	10,417	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,546	12,705	12,794	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2025 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[73]	S&P Target Date To 2025 Index1
Account Value		$ 17,299	15,724	14,952	16,159	13,904	13,000	12,440	11,687	10,741	10,417	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,546	12,705	12,794	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2025 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[74]	S&P Target Date To 2025 Index1
Account Value		$ 17,299	15,724	14,952	16,159	13,904	13,000	12,440	11,687	10,741	10,417	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,546	12,705	12,794	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2025 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[75]	S&P Target Date To 2025 Index1
Account Value		$ 17,299	15,724	14,952	16,159	13,904	13,000	12,440	11,687	10,741	10,417	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2025 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[76]	S&P Target Date To 2025 Index1
Account Value		$ 17,299	15,724	14,952	16,159	13,904	13,000	12,440	11,687	10,741	10,417	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2025 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[77]	S&P Target Date To 2025 Index1
Account Value		$ 17,299	15,724	14,952	16,159	13,904	13,000	12,440	11,687	10,741	10,417	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2025 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[78]	S&P Target Date To 2025 Index1
Account Value		$ 17,299	15,724	14,952	16,159	13,904	13,000	12,440	11,687	10,741	10,417	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2025 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[79]	S&P Target Date To 2025 Index1
Account Value		$ 17,299	15,724	14,952	16,159	13,904	13,000	12,440	11,687	10,741	10,417	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,546	12,705	12,794	11,619	10,750	10,837	10,893	10,282	10,000
S&P Target Date To 2025 Index
Account Value [Line Items]
Line Graph and Table Measure Name	[80]	S&P Target Date To 2025 Index1
Account Value		$ 17,299	15,724	14,952	16,159	13,904	13,000	12,440	11,687	10,741	10,417	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
S&P Target Date To Retirement Income Index
Account Value [Line Items]
Line Graph and Table Measure Name	[81]	S&P Target Date To Retirement Income Index1
Account Value		$ 14,919	13,721	13,281	14,306	12,975	12,052	11,432	11,000	10,659	10,275	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
S&P Target Date To Retirement Income Index
Account Value [Line Items]
Line Graph and Table Measure Name	[82]	S&P Target Date To Retirement Income Index1
Account Value		$ 14,919	13,721	13,281	14,306	12,975	12,052	11,432	11,000	10,659	10,275	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
S&P Target Date To Retirement Income Index
Account Value [Line Items]
Line Graph and Table Measure Name	[83]	S&P Target Date To Retirement Income Index1
Account Value		$ 14,919	13,721	13,281	14,306	12,975	12,052	11,432	11,000	10,659	10,275	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
S&P Target Date To Retirement Income Index
Account Value [Line Items]
Line Graph and Table Measure Name	[84]	S&P Target Date To Retirement Income Index1
Account Value		$ 14,919	13,721	13,281	14,306	12,975	12,052	11,432	11,000	10,659	10,275	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
S&P Target Date To Retirement Income Index
Account Value [Line Items]
Line Graph and Table Measure Name	[85]	S&P Target Date To Retirement Income Index1
Account Value		$ 14,919	13,721	13,281	14,306	12,975	12,052	11,432	11,000	10,659	10,275	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
S&P Target Date To Retirement Income Index
Account Value [Line Items]
Line Graph and Table Measure Name	[86]	S&P Target Date To Retirement Income Index1
Account Value		$ 14,919	13,721	13,281	14,306	12,975	12,052	11,432	11,000	10,659	10,275	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
S&P Target Date To Retirement Income Index
Account Value [Line Items]
Line Graph and Table Measure Name	[87]	S&P Target Date To Retirement Income Index1
Account Value		$ 14,919	13,721	13,281	14,306	12,975	12,052	11,432	11,000	10,659	10,275	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
S&P Target Date To Retirement Income Index
Account Value [Line Items]
Line Graph and Table Measure Name	[88]	S&P Target Date To Retirement Income Index1
Account Value		$ 14,919	13,721	13,281	14,306	12,975	12,052	11,432	11,000	10,659	10,275	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	28,165	24,921	26,134	19,153	17,108	15,843	13,629	11,745	11,121	10,000
Bloomberg U.S. Aggregate Index
Account Value [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Account Value		$ 11,727	11,158	11,547	12,705	12,795	11,619	10,750	10,837	10,893	10,282	10,000
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		Russell 3000 Index
Account Value		$ 32,705	27,013	23,979	25,882	18,657	16,819	15,711	13,498	11,623	11,128	10,000
S&P Target Date To Retirement Income Index
Account Value [Line Items]
Line Graph and Table Measure Name	[89]	S&P Target Date To Retirement Income Index1
Account Value		$ 14,919	13,721	13,281	14,306	12,975	12,052	11,432	11,000	10,659	10,275	10,000
S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Account Value		$ 34,403	$ 28,165	$ 24,921	$ 26,134	$ 19,153	$ 17,108	$ 15,843	$ 13,629	$ 11,745	$ 11,121	$ 10,000
[1] 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund.

Shareholder Report, Average Ann

Shareholder Report, Average Annual Return (Details)		12 Months Ended		43 Months Ended	60 Months Ended		104 Months Ended	120 Months Ended
		Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024
Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A (with sales charge)
Average Annual Return, Percent			15.25%	8.02%
Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C (with sales charge)
Average Annual Return, Percent			20.39%	9.02%
Class R
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R
Average Annual Return, Percent			21.78%	9.38%
Class R3
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R3
Average Annual Return, Percent			22.10%	9.67%
Class R4
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R4
Average Annual Return, Percent			22.46%	9.94%
Class R5
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R5
Average Annual Return, Percent			22.59%	10.10%
Class R6
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R6
Average Annual Return, Percent			22.81%	10.22%
Class Y
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class Y
Average Annual Return, Percent			22.58%	10.10%
Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A (with sales charge)
Average Annual Return, Percent			14.73%		9.60%		8.66%
Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B (with sales charge)
Average Annual Return, Percent			15.84%		9.81%		8.66%
Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C (with sales charge)
Average Annual Return, Percent			19.93%		10.10%		8.65%
Class R
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R
Average Annual Return, Percent			21.33%		10.51%		9.07%
Class R3
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R3
Average Annual Return, Percent			21.59%		10.78%		9.30%
Class R4
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R4
Average Annual Return, Percent			21.92%		11.07%		9.57%
Class R5
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R5
Average Annual Return, Percent			22.08%		11.22%		9.72%
Class R6
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R6
Average Annual Return, Percent			22.17%		11.30%		9.77%
Class Y
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class Y
Average Annual Return, Percent			22.19%		11.21%		9.69%
Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A (with sales charge)
Average Annual Return, Percent			14.12%		9.12%			7.92%
Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B (with sales charge)
Average Annual Return, Percent			15.15%		9.31%			7.93%
Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C (with sales charge)
Average Annual Return, Percent			19.12%		9.58%			7.92%
Class R
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R
Average Annual Return, Percent			20.54%		10.03%			8.24%
Class R3
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R3
Average Annual Return, Percent			20.81%		10.29%			8.48%
Class R4
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R4
Average Annual Return, Percent			21.15%		10.56%			8.75%
Class R5
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R5
Average Annual Return, Percent			21.36%		10.72%			8.90%
Class R6
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R6
Average Annual Return, Percent			21.45%		10.80%			8.94%
Class Y
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class Y
Average Annual Return, Percent			21.31%		10.69%			8.84%
Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A (with sales charge)
Average Annual Return, Percent			13.36%		8.60%			7.62%
Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B (with sales charge)
Average Annual Return, Percent			14.38%		8.79%			7.62%
Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C (with sales charge)
Average Annual Return, Percent			18.42%		9.07%			7.62%
Class R
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R
Average Annual Return, Percent		19.79%				9.50%			7.95%
Class R3
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R3
Average Annual Return, Percent			20.14%		9.75%			8.17%
Class R4
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R4
Average Annual Return, Percent			20.36%		10.02%			8.44%
Class R5
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R5
Average Annual Return, Percent			20.59%		10.19%			8.58%
Class R6
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R6
Average Annual Return, Percent			20.68%		10.26%			8.61%
Class Y
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class Y
Average Annual Return, Percent			20.62%		10.16%			8.53%
Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A (with sales charge)
Average Annual Return, Percent			12.62%		7.87%			7.19%
Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B (with sales charge)
Average Annual Return, Percent			13.57%		8.05%			7.19%
Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C (with sales charge)
Average Annual Return, Percent			17.55%		8.34%			7.19%
Class R
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R
Average Annual Return, Percent			19.04%		8.78%			7.50%
Class R3
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R3
Average Annual Return, Percent			19.33%		9.05%			7.74%
Class R4
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R4
Average Annual Return, Percent			19.58%		9.32%			8.01%
Class R5
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R5
Average Annual Return, Percent			19.76%		9.46%			8.15%
Class R6
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R6
Average Annual Return, Percent			19.94%		9.54%			8.19%
Class Y
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class Y
Average Annual Return, Percent			19.77%		9.45%			8.11%
Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A (with sales charge)
Average Annual Return, Percent			11.53%		6.86%			6.53%
Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B (with sales charge)
Average Annual Return, Percent			12.47%		7.03%			6.52%
Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C (with sales charge)
Average Annual Return, Percent			16.41%		7.32%			6.53%
Class R
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R
Average Annual Return, Percent			17.87%		7.75%			6.84%
Class R3
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R3
Average Annual Return, Percent			18.16%		7.99%			7.05%
Class R4
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R4
Average Annual Return, Percent			18.49%		8.26%			7.31%
Class R5
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R5
Average Annual Return, Percent			18.66%		8.43%			7.46%
Class R6
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R6
Average Annual Return, Percent			18.76%		8.51%			7.51%
Class Y
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class Y
Average Annual Return, Percent			18.63%		8.40%			7.43%
Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A (with sales charge)
Average Annual Return, Percent			9.96%		5.51%			5.61%
Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B (with sales charge)
Average Annual Return, Percent			10.79%		5.66%			5.60%
Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C (with sales charge)
Average Annual Return, Percent			14.77%		5.98%			5.60%
Class R
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R
Average Annual Return, Percent			16.23%		6.39%			5.92%
Class R3
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R3
Average Annual Return, Percent			16.52%		6.65%			6.11%
Class R4
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R4
Average Annual Return, Percent			16.82%		6.91%			6.37%
Class R5
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R5
Average Annual Return, Percent			16.96%		7.05%			6.52%
Class R6
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R6
Average Annual Return, Percent			17.10%		7.15%			6.58%
Class Y
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class Y
Average Annual Return, Percent			16.99%		7.06%			6.51%
Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A (with sales charge)
Average Annual Return, Percent			7.02%		3.71%			4.39%
Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B (with sales charge)
Average Annual Return, Percent			7.71%		3.84%			4.38%
Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C (with sales charge)
Average Annual Return, Percent			11.77%		4.17%			4.39%
Class R
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R
Average Annual Return, Percent			13.17%		4.58%			4.70%
Class R3
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R3
Average Annual Return, Percent			13.42%		4.80%			4.87%
Class R4
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R4
Average Annual Return, Percent			13.74%		5.06%			5.13%
Class R5
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R5
Average Annual Return, Percent			13.88%		5.22%			5.27%
Class R6
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R6
Average Annual Return, Percent			13.97%		5.31%			5.35%
Class Y
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class Y
Average Annual Return, Percent			13.91%		5.22%			5.28%
Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A (with sales charge)
Average Annual Return, Percent			5%		2.17%			3.22%
Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B (with sales charge)
Average Annual Return, Percent			5.59%		2.27%			3.20%
Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C (with sales charge)
Average Annual Return, Percent			9.57%		2.61%			3.21%
Class R
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R
Average Annual Return, Percent			11.01%		3.02%			3.51%
Class R3
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R3
Average Annual Return, Percent			11.23%		3.24%			3.68%
Class R4
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R4
Average Annual Return, Percent			11.54%		3.50%			3.94%
Class R5
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R5
Average Annual Return, Percent			11.72%		3.65%			4.08%
Class R6
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R6
Average Annual Return, Percent			11.81%		3.74%			4.16%
Class Y
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class Y
Average Annual Return, Percent			11.68%		3.65%			4.08%
Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A (with sales charge)
Average Annual Return, Percent			6.53%		1.75%			2.26%
Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B (with sales charge)
Average Annual Return, Percent			5.12%		1.47%			2.06%
Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C (with sales charge)
Average Annual Return, Percent			9.10%		1.82%			2.06%
Class R
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R
Average Annual Return, Percent			10.49%		2.23%			2.36%
Class R3
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R3
Average Annual Return, Percent			10.76%		2.42%			2.51%
Class R4
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R4
Average Annual Return, Percent			11.07%		2.69%			2.78%
Class R5
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R5
Average Annual Return, Percent			11.20%		2.84%			2.92%
Class R6
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class R6
Average Annual Return, Percent			11.32%		2.94%			3.01%
Class Y
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class Y
Average Annual Return, Percent			11.19%		2.84%			2.93%
Without Sales Load [Member] | Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A
Average Annual Return, Percent			22.28%	9.82%
Without Sales Load [Member] | Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C
Average Annual Return, Percent			21.39%	9.02%
Without Sales Load [Member] | Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A
Average Annual Return, Percent			21.73%		10.90%		9.40%
Without Sales Load [Member] | Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B
Average Annual Return, Percent			20.84%		10.08%		8.66%
Without Sales Load [Member] | Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C
Average Annual Return, Percent			20.93%		10.10%		8.65%
Without Sales Load [Member] | Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A
Average Annual Return, Percent			21.09%		10.42%			8.56%
Without Sales Load [Member] | Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B
Average Annual Return, Percent			20.15%		9.59%			7.93%
Without Sales Load [Member] | Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C
Average Annual Return, Percent			20.12%		9.58%			7.92%
Without Sales Load [Member] | Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A
Average Annual Return, Percent			20.28%		9.89%			8.26%
Without Sales Load [Member] | Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B
Average Annual Return, Percent			19.38%		9.07%			7.62%
Without Sales Load [Member] | Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C
Average Annual Return, Percent			19.42%		9.07%			7.62%
Without Sales Load [Member] | Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A
Average Annual Return, Percent			19.49%		9.16%			7.83%
Without Sales Load [Member] | Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B
Average Annual Return, Percent			18.57%		8.34%			7.19%
Without Sales Load [Member] | Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C
Average Annual Return, Percent			18.55%		8.34%			7.19%
Without Sales Load [Member] | Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A
Average Annual Return, Percent			18.34%		8.14%			7.16%
Without Sales Load [Member] | Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B
Average Annual Return, Percent			17.47%		7.33%			6.52%
Without Sales Load [Member] | Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C
Average Annual Return, Percent			17.41%		7.32%			6.53%
Without Sales Load [Member] | Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A
Average Annual Return, Percent			16.67%		6.77%			6.24%
Without Sales Load [Member] | Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B
Average Annual Return, Percent			15.79%		5.98%			5.60%
Without Sales Load [Member] | Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C
Average Annual Return, Percent			15.77%		5.98%			5.60%
Without Sales Load [Member] | Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A
Average Annual Return, Percent			13.55%		4.95%			5.01%
Without Sales Load [Member] | Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B
Average Annual Return, Percent			12.71%		4.17%			4.38%
Without Sales Load [Member] | Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C
Average Annual Return, Percent			12.77%		4.17%			4.39%
Without Sales Load [Member] | Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A
Average Annual Return, Percent			11.41%		3.39%			3.83%
Without Sales Load [Member] | Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B
Average Annual Return, Percent			10.59%		2.61%			3.20%
Without Sales Load [Member] | Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C
Average Annual Return, Percent			10.58%		2.61%			3.21%
Without Sales Load [Member] | Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class A
Average Annual Return, Percent			10.97%		2.58%			2.68%
Without Sales Load [Member] | Class B
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class B
Average Annual Return, Percent			10.12%		1.82%			2.06%
Without Sales Load [Member] | Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Class C
Average Annual Return, Percent			10.10%		1.82%			2.06%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%	11.54%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%	(2.35%)
S&P Target Date To 2065+ Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[1]		S&P Target Date To 2065+ Index1
Average Annual Return, Percent	[1]		15.83%	8.31%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%	13.08%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%	11.54%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%	(2.35%)
S&P Target Date To 2065+ Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[2]		S&P Target Date To 2065+ Index1
Average Annual Return, Percent	[2]		15.83%	8.31%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%	13.08%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%	11.54%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%	(2.35%)
S&P Target Date To 2065+ Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[3]		S&P Target Date To 2065+ Index1
Average Annual Return, Percent	[3]		15.83%	8.31%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%	13.08%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%	11.54%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%	(2.35%)
S&P Target Date To 2065+ Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[4]		S&P Target Date To 2065+ Index1
Average Annual Return, Percent	[4]		15.83%	8.31%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%	13.08%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%	11.54%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%	(2.35%)
S&P Target Date To 2065+ Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[5]		S&P Target Date To 2065+ Index1
Average Annual Return, Percent	[5]		15.83%	8.31%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%	13.08%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%	11.54%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%	(2.35%)
S&P Target Date To 2065+ Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[6]		S&P Target Date To 2065+ Index1
Average Annual Return, Percent	[6]		15.83%	8.31%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%	13.08%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%	11.54%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%	(2.35%)
S&P Target Date To 2065+ Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[7]		S&P Target Date To 2065+ Index1
Average Annual Return, Percent	[7]		15.83%	8.31%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%	13.08%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%	11.54%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%	(2.35%)
S&P Target Date To 2065+ Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[8]		S&P Target Date To 2065+ Index1
Average Annual Return, Percent	[8]		15.83%	8.31%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%	13.08%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%		13.38%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%		1.50%
S&P Target Date To 2060 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[9]		S&P Target Date To 2060 Index1
Average Annual Return, Percent	[9]		15.45%		10.24%		9.71%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%		13.96%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%		13.38%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%		1.50%
S&P Target Date To 2060 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[10]		S&P Target Date To 2060 Index1
Average Annual Return, Percent	[10]		15.45%		10.24%		9.71%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%		13.96%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%		13.38%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%		1.50%
S&P Target Date To 2060 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[11]		S&P Target Date To 2060 Index1
Average Annual Return, Percent	[11]		15.45%		10.24%		9.71%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%		13.96%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%		13.38%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%		1.50%
S&P Target Date To 2060 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[12]		S&P Target Date To 2060 Index1
Average Annual Return, Percent	[12]		15.45%		10.24%		9.71%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%		13.96%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%		13.38%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%		1.50%
S&P Target Date To 2060 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[13]		S&P Target Date To 2060 Index1
Average Annual Return, Percent	[13]		15.45%		10.24%		9.71%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%		13.96%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%		13.38%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%		1.50%
S&P Target Date To 2060 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[14]		S&P Target Date To 2060 Index1
Average Annual Return, Percent	[14]		15.45%		10.24%		9.71%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%		13.96%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%		13.38%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%		1.50%
S&P Target Date To 2060 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[15]		S&P Target Date To 2060 Index1
Average Annual Return, Percent	[15]		15.45%		10.24%		9.71%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%		13.96%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%		13.38%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%		1.50%
S&P Target Date To 2060 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[16]		S&P Target Date To 2060 Index1
Average Annual Return, Percent	[16]		15.45%		10.24%		9.71%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%		13.96%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%		13.38%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%		1.50%
S&P Target Date To 2060 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[17]		S&P Target Date To 2060 Index1
Average Annual Return, Percent	[17]		15.45%		10.24%		9.71%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%		13.96%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2055 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[18]		S&P Target Date To 2055 Index1
Average Annual Return, Percent	[18]		15.41%		10.01%			8.44%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2055 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[19]		S&P Target Date To 2055 Index1
Average Annual Return, Percent	[19]		15.41%		10.01%			8.44%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2055 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[20]		S&P Target Date To 2055 Index1
Average Annual Return, Percent	[20]		15.41%		10.01%			8.44%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2055 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[21]		S&P Target Date To 2055 Index1
Average Annual Return, Percent	[21]		15.41%		10.01%			8.44%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2055 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[22]		S&P Target Date To 2055 Index1
Average Annual Return, Percent	[22]		15.41%		10.01%			8.44%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2055 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[23]		S&P Target Date To 2055 Index1
Average Annual Return, Percent	[23]		15.41%		10.01%			8.44%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2055 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[24]		S&P Target Date To 2055 Index1
Average Annual Return, Percent	[24]		15.41%		10.01%			8.44%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2055 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[25]		S&P Target Date To 2055 Index1
Average Annual Return, Percent	[25]		15.41%		10.01%			8.44%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2055 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[26]		S&P Target Date To 2055 Index1
Average Annual Return, Percent	[26]		15.41%		10.01%			8.44%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2050 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[27]		S&P Target Date To 2050 Index1
Average Annual Return, Percent	[27]		15.46%		10%			8.39%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2050 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[28]		S&P Target Date To 2050 Index1
Average Annual Return, Percent	[28]		15.46%		10%			8.39%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2050 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[29]		S&P Target Date To 2050 Index1
Average Annual Return, Percent	[29]		15.46%		10%			8.39%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent		21.07%				14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent		5.10%				0.19%			1.61%
S&P Target Date To 2050 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[30]		S&P Target Date To 2050 Index1
Average Annual Return, Percent	[30]	15.46%				10%			8.39%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent		22.15%				15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2050 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[31]		S&P Target Date To 2050 Index1
Average Annual Return, Percent	[31]		15.46%		10%			8.39%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2050 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[32]		S&P Target Date To 2050 Index1
Average Annual Return, Percent	[32]		15.46%		10%			8.39%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2050 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[33]		S&P Target Date To 2050 Index1
Average Annual Return, Percent	[33]		15.46%		10%			8.39%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2050 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[34]		S&P Target Date To 2050 Index1
Average Annual Return, Percent	[34]		15.46%		10%			8.39%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2050 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[35]		S&P Target Date To 2050 Index1
Average Annual Return, Percent	[35]		15.46%		10%			8.39%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2045 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[36]		S&P Target Date To 2045 Index1
Average Annual Return, Percent	[36]		14.73%		9.55%			8.10%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2045 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[37]		S&P Target Date To 2045 Index1
Average Annual Return, Percent	[37]		14.73%		9.55%			8.10%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2045 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[38]		S&P Target Date To 2045 Index1
Average Annual Return, Percent	[38]		14.73%		9.55%			8.10%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2045 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[39]		S&P Target Date To 2045 Index1
Average Annual Return, Percent	[39]		14.73%		9.55%			8.10%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2045 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[40]		S&P Target Date To 2045 Index1
Average Annual Return, Percent	[40]		14.73%		9.55%			8.10%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2045 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[41]		S&P Target Date To 2045 Index1
Average Annual Return, Percent	[41]		14.73%		9.55%			8.10%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2045 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[42]		S&P Target Date To 2045 Index1
Average Annual Return, Percent	[42]		14.73%		9.55%			8.10%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2045 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[43]		S&P Target Date To 2045 Index1
Average Annual Return, Percent	[43]		14.73%		9.55%			8.10%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2045 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[44]		S&P Target Date To 2045 Index1
Average Annual Return, Percent	[44]		14.73%		9.55%			8.10%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2040 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[45]		S&P Target Date To 2040 Index1
Average Annual Return, Percent	[45]		13.85%		8.89%			7.68%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2040 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[46]		S&P Target Date To 2040 Index1
Average Annual Return, Percent	[46]		13.85%		8.89%			7.68%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2040 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[47]		S&P Target Date To 2040 Index1
Average Annual Return, Percent	[47]		13.85%		8.89%			7.68%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2040 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[48]		S&P Target Date To 2040 Index1
Average Annual Return, Percent	[48]		13.85%		8.89%			7.68%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2040 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[49]		S&P Target Date To 2040 Index1
Average Annual Return, Percent	[49]		13.85%		8.89%			7.68%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2040 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[50]		S&P Target Date To 2040 Index1
Average Annual Return, Percent	[50]		13.85%		8.89%			7.68%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2040 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[51]		S&P Target Date To 2040 Index1
Average Annual Return, Percent	[51]		13.85%		8.89%			7.68%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2040 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[52]		S&P Target Date To 2040 Index1
Average Annual Return, Percent	[52]		13.85%		8.89%			7.68%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2040 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[53]		S&P Target Date To 2040 Index1
Average Annual Return, Percent	[53]		13.85%		8.89%			7.68%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2035 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[54]		S&P Target Date To 2035 Index1
Average Annual Return, Percent	[54]		12.73%		8.10%			7.11%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2035 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[55]		S&P Target Date To 2035 Index1
Average Annual Return, Percent	[55]		12.73%		8.10%			7.11%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2035 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[56]		S&P Target Date To 2035 Index1
Average Annual Return, Percent	[56]		12.73%		8.10%			7.11%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2035 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[57]		S&P Target Date To 2035 Index1
Average Annual Return, Percent	[57]		12.73%		8.10%			7.11%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2035 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[58]		S&P Target Date To 2035 Index1
Average Annual Return, Percent	[58]		12.73%		8.10%			7.11%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2035 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[59]		S&P Target Date To 2035 Index1
Average Annual Return, Percent	[59]		12.73%		8.10%			7.11%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2035 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[60]		S&P Target Date To 2035 Index1
Average Annual Return, Percent	[60]		12.73%		8.10%			7.11%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2035 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[61]		S&P Target Date To 2035 Index1
Average Annual Return, Percent	[61]		12.73%		8.10%			7.11%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2035 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[62]		S&P Target Date To 2035 Index1
Average Annual Return, Percent	[62]		12.73%		8.10%			7.11%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2030 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[63]		S&P Target Date To 2030 Index1
Average Annual Return, Percent	[63]		11.36%		7.01%			6.41%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2030 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[64]		S&P Target Date To 2030 Index1
Average Annual Return, Percent	[64]		11.36%		7.01%			6.41%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2030 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[65]		S&P Target Date To 2030 Index1
Average Annual Return, Percent	[65]		11.36%		7.01%			6.41%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2030 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[66]		S&P Target Date To 2030 Index1
Average Annual Return, Percent	[66]		11.36%		7.01%			6.41%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2030 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[67]		S&P Target Date To 2030 Index1
Average Annual Return, Percent	[67]		11.36%		7.01%			6.41%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2030 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[68]		S&P Target Date To 2030 Index1
Average Annual Return, Percent	[68]		11.36%		7.01%			6.41%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2030 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[69]		S&P Target Date To 2030 Index1
Average Annual Return, Percent	[69]		11.36%		7.01%			6.41%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2030 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[70]		S&P Target Date To 2030 Index1
Average Annual Return, Percent	[70]		11.36%		7.01%			6.41%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2030 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[71]		S&P Target Date To 2030 Index1
Average Annual Return, Percent	[71]		11.36%		7.01%			6.41%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2025 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[72]		S&P Target Date To 2025 Index1
Average Annual Return, Percent	[72]		10.01%		5.88%			5.63%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2025 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[73]		S&P Target Date To 2025 Index1
Average Annual Return, Percent	[73]		10.01%		5.88%			5.63%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2025 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[74]		S&P Target Date To 2025 Index1
Average Annual Return, Percent	[74]		10.01%		5.88%			5.63%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2025 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[75]		S&P Target Date To 2025 Index1
Average Annual Return, Percent	[75]		10.01%		5.88%			5.63%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2025 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[76]		S&P Target Date To 2025 Index1
Average Annual Return, Percent	[76]		10.01%		5.88%			5.63%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2025 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[77]		S&P Target Date To 2025 Index1
Average Annual Return, Percent	[77]		10.01%		5.88%			5.63%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2025 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[78]		S&P Target Date To 2025 Index1
Average Annual Return, Percent	[78]		10.01%		5.88%			5.63%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2025 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[79]		S&P Target Date To 2025 Index1
Average Annual Return, Percent	[79]		10.01%		5.88%			5.63%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
S&P Target Date To 2025 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[80]		S&P Target Date To 2025 Index1
Average Annual Return, Percent	[80]		10.01%		5.88%			5.63%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
S&P Target Date To Retirement Income Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[81]		S&P Target Date To Retirement Income Index1
Average Annual Return, Percent	[81]		8.73%		4.36%			4.08%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
S&P Target Date To Retirement Income Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[82]		S&P Target Date To Retirement Income Index1
Average Annual Return, Percent	[82]		8.73%		4.36%			4.08%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
S&P Target Date To Retirement Income Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[83]		S&P Target Date To Retirement Income Index1
Average Annual Return, Percent	[83]		8.73%		4.36%			4.08%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
S&P Target Date To Retirement Income Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[84]		S&P Target Date To Retirement Income Index1
Average Annual Return, Percent	[84]		8.73%		4.36%			4.08%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
S&P Target Date To Retirement Income Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[85]		S&P Target Date To Retirement Income Index1
Average Annual Return, Percent	[85]		8.73%		4.36%			4.08%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
S&P Target Date To Retirement Income Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[86]		S&P Target Date To Retirement Income Index1
Average Annual Return, Percent	[86]		8.73%		4.36%			4.08%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
S&P Target Date To Retirement Income Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[87]		S&P Target Date To Retirement Income Index1
Average Annual Return, Percent	[87]		8.73%		4.36%			4.08%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
S&P Target Date To Retirement Income Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[88]		S&P Target Date To Retirement Income Index1
Average Annual Return, Percent	[88]		8.73%		4.36%			4.08%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
Bloomberg U.S. Aggregate Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Bloomberg U.S. Aggregate Index
Average Annual Return, Percent			5.10%		0.19%			1.61%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			Russell 3000 Index
Average Annual Return, Percent			21.07%		14.23%			12.58%
S&P Target Date To Retirement Income Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	[89]		S&P Target Date To Retirement Income Index1
Average Annual Return, Percent	[89]		8.73%		4.36%			4.08%
S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			S&P 500 Index
Average Annual Return, Percent			22.15%		15%			13.15%
[1] 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2065+ Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2065+ Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2060 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2060 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2055 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2055 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2050 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2050 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2045 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2045 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2040 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2040 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2035 Index replaced the S&P 500 Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2035 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2030 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2030 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To 2025 Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To 2025 Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund. 1 Effective July 24, 2024, the S&P Target Date To Retirement Income Index replaced the S&P 500 Index and the Bloomberg U.S. Aggregate Index as the Fund’s benchmark. The Fund’s investment manager believes the S&P Target Date To Retirement Income Index is an appropriate benchmark for the Fund.

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Jul. 31, 2024
Class A | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	48.10%
Class A | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	23.60%
Class A | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	18.30%
Class A | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	5%
Class A | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Class A | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Class A | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class A | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class C | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	48.10%
Class C | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	23.60%
Class C | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	18.30%
Class C | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	5%
Class C | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Class C | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Class C | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class C | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	48.10%
Class R | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	23.60%
Class R | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	18.30%
Class R | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	5%
Class R | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Class R | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Class R | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R3 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	48.10%
Class R3 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	23.60%
Class R3 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	18.30%
Class R3 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	5%
Class R3 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Class R3 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Class R3 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R3 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R4 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	48.10%
Class R4 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	23.60%
Class R4 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	18.30%
Class R4 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	5%
Class R4 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Class R4 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Class R4 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R4 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R5 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	48.10%
Class R5 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	23.60%
Class R5 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	18.30%
Class R5 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	5%
Class R5 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Class R5 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Class R5 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R5 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R6 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	48.10%
Class R6 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	23.60%
Class R6 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	18.30%
Class R6 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	5%
Class R6 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Class R6 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Class R6 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R6 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class Y | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	48.10%
Class Y | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	23.60%
Class Y | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	18.30%
Class Y | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	5%
Class Y | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Class Y | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Class Y | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class Y | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class A | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	46.70%
Class A | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	22.90%
Class A | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class A | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Class A | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class A | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Class A | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class A | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class B | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	46.70%
Class B | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	22.90%
Class B | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class B | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Class B | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class B | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Class B | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class B | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class C | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	46.70%
Class C | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	22.90%
Class C | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class C | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Class C | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class C | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Class C | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class C | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class R | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	46.70%
Class R | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	22.90%
Class R | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class R | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Class R | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Class R | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class R3 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	46.70%
Class R3 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	22.90%
Class R3 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class R3 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Class R3 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R3 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Class R3 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R3 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class R4 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	46.70%
Class R4 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	22.90%
Class R4 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class R4 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Class R4 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R4 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Class R4 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R4 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class R5 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	46.70%
Class R5 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	22.90%
Class R5 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class R5 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Class R5 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R5 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Class R5 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R5 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class R6 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	46.70%
Class R6 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	22.90%
Class R6 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class R6 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Class R6 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R6 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Class R6 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R6 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class Y | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	46.70%
Class Y | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	22.90%
Class Y | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class Y | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Class Y | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class Y | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Class Y | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class Y | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class A | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	44.30%
Class A | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Class A | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class A | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Class A | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class A | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Class A | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class A | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class B | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	44.30%
Class B | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Class B | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class B | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Class B | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class B | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Class B | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class B | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class C | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	44.30%
Class C | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Class C | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class C | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Class C | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class C | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Class C | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class C | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class R | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	44.30%
Class R | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Class R | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class R | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Class R | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class R | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Class R | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class R3 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	44.30%
Class R3 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Class R3 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class R3 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Class R3 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class R3 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Class R3 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R3 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class R4 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	44.30%
Class R4 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Class R4 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class R4 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Class R4 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class R4 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Class R4 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R4 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class R5 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	44.30%
Class R5 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Class R5 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class R5 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Class R5 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class R5 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Class R5 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R5 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class R6 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	44.30%
Class R6 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Class R6 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class R6 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Class R6 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class R6 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Class R6 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R6 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class Y | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	44.30%
Class Y | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Class Y | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class Y | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	8.80%
Class Y | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class Y | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Class Y | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class Y | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Class A | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	42%
Class A | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	20.50%
Class A | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Class A | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Class A | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class A | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class A | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class A | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class B | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	42%
Class B | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	20.50%
Class B | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Class B | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Class B | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class B | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class B | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class B | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class C | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	42%
Class C | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	20.50%
Class C | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Class C | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Class C | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class C | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class C | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class C | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class R | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	42%
Class R | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	20.50%
Class R | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Class R | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Class R | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class R | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class R | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class R | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class R3 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	42%
Class R3 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	20.50%
Class R3 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Class R3 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Class R3 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class R3 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class R3 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class R3 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class R4 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	42%
Class R4 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	20.50%
Class R4 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Class R4 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Class R4 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class R4 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class R4 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class R4 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class R5 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	42%
Class R5 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	20.50%
Class R5 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Class R5 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Class R5 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class R5 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class R5 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class R5 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class R6 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	42%
Class R6 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	20.50%
Class R6 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Class R6 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Class R6 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class R6 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class R6 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class R6 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class Y | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	42%
Class Y | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	20.50%
Class Y | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Class Y | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Class Y | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class Y | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class Y | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class Y | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class A | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	39.20%
Class A | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	19.10%
Class A | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	15.40%
Class A | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class A | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class A | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Class A | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	2%
Class A | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Class B | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	39.20%
Class B | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	19.10%
Class B | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	15.40%
Class B | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class B | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class B | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Class B | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	2%
Class B | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Class C | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	39.20%
Class C | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	19.10%
Class C | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	15.40%
Class C | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class C | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class C | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Class C | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	2%
Class C | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Class R | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	39.20%
Class R | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	19.10%
Class R | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	15.40%
Class R | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class R | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Class R | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	2%
Class R | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Class R3 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	39.20%
Class R3 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	19.10%
Class R3 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	15.40%
Class R3 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class R3 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R3 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Class R3 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	2%
Class R3 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Class R4 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	39.20%
Class R4 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	19.10%
Class R4 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	15.40%
Class R4 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class R4 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R4 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Class R4 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	2%
Class R4 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Class R5 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	39.20%
Class R5 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	19.10%
Class R5 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	15.40%
Class R5 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class R5 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R5 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Class R5 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	2%
Class R5 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Class R6 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	39.20%
Class R6 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	19.10%
Class R6 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	15.40%
Class R6 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class R6 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R6 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Class R6 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	2%
Class R6 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Class Y | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	39.20%
Class Y | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	19.10%
Class Y | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	15.40%
Class Y | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class Y | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class Y | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Class Y | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	2%
Class Y | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Class A | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	36.20%
Class A | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	22.80%
Class A | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class A | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Class A | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Class A | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	3%
Class A | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Class A | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class B | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	36.20%
Class B | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	22.80%
Class B | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class B | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Class B | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Class B | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	3%
Class B | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Class B | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class C | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	36.20%
Class C | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	22.80%
Class C | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class C | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Class C | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Class C | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	3%
Class C | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Class C | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	36.20%
Class R | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	22.80%
Class R | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class R | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Class R | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Class R | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	3%
Class R | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Class R | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R3 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	36.20%
Class R3 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	22.80%
Class R3 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class R3 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Class R3 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Class R3 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	3%
Class R3 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Class R3 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R4 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	36.20%
Class R4 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	22.80%
Class R4 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class R4 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Class R4 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Class R4 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	3%
Class R4 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Class R4 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R5 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	36.20%
Class R5 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	22.80%
Class R5 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class R5 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Class R5 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Class R5 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	3%
Class R5 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Class R5 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R6 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	36.20%
Class R6 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	22.80%
Class R6 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class R6 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Class R6 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Class R6 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	3%
Class R6 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Class R6 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class Y | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	36.20%
Class Y | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	22.80%
Class Y | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Class Y | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Class Y | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Class Y | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	3%
Class Y | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Class Y | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class A | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	33.30%
Class A | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	31.50%
Class A | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	15.70%
Class A | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	9.90%
Class A | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class A | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class A | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class A | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class B | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	33.30%
Class B | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	31.50%
Class B | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	15.70%
Class B | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	9.90%
Class B | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class B | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class B | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class B | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class C | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	33.30%
Class C | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	31.50%
Class C | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	15.70%
Class C | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	9.90%
Class C | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class C | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class C | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class C | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	33.30%
Class R | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	31.50%
Class R | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	15.70%
Class R | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	9.90%
Class R | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class R | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R3 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	33.30%
Class R3 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	31.50%
Class R3 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	15.70%
Class R3 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	9.90%
Class R3 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R3 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class R3 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R3 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R4 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	33.30%
Class R4 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	31.50%
Class R4 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	15.70%
Class R4 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	9.90%
Class R4 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R4 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class R4 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R4 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R5 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	33.30%
Class R5 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	31.50%
Class R5 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	15.70%
Class R5 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	9.90%
Class R5 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R5 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class R5 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R5 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class R6 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	33.30%
Class R6 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	31.50%
Class R6 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	15.70%
Class R6 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	9.90%
Class R6 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class R6 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class R6 | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class R6 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class Y | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	33.30%
Class Y | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	31.50%
Class Y | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	15.70%
Class Y | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	9.90%
Class Y | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Class Y | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Class Y | Putnam Panagora ESG Emerging Markets Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Class Y | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Class A | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	49.10%
Class A | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Class A | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	10.70%
Class A | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class A | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class A | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Class A | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class B | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	49.10%
Class B | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Class B | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	10.70%
Class B | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class B | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class B | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Class B | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class C | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	49.10%
Class C | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Class C | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	10.70%
Class C | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class C | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class C | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Class C | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class R | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	49.10%
Class R | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Class R | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	10.70%
Class R | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class R | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class R | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Class R | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class R3 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	49.10%
Class R3 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Class R3 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	10.70%
Class R3 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class R3 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class R3 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Class R3 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class R4 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	49.10%
Class R4 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Class R4 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	10.70%
Class R4 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class R4 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class R4 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Class R4 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class R5 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	49.10%
Class R5 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Class R5 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	10.70%
Class R5 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class R5 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class R5 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Class R5 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class R6 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	49.10%
Class R6 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Class R6 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	10.70%
Class R6 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class R6 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class R6 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Class R6 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class Y | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	49.10%
Class Y | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Class Y | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	10.70%
Class Y | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class Y | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Class Y | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Class Y | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Class A | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.70%
Class A | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class A | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	14.20%
Class A | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Class A | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class A | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class A | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class B | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.70%
Class B | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class B | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	14.20%
Class B | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Class B | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class B | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class B | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class C | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.70%
Class C | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class C | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	14.20%
Class C | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Class C | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class C | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class C | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class R | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.70%
Class R | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class R | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	14.20%
Class R | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Class R | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class R | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class R | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class R3 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.70%
Class R3 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class R3 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	14.20%
Class R3 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Class R3 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class R3 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class R3 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class R4 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.70%
Class R4 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class R4 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	14.20%
Class R4 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Class R4 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class R4 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class R4 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class R5 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.70%
Class R5 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class R5 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	14.20%
Class R5 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Class R5 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class R5 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class R5 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class R6 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.70%
Class R6 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class R6 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	14.20%
Class R6 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Class R6 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class R6 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class R6 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class Y | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.70%
Class Y | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	14.80%
Class Y | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	14.20%
Class Y | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Class Y | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class Y | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Class Y | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Class A | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.10%
Class A | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class A | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	13.90%
Class A | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7%
Class A | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class A | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class A | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Class B | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.10%
Class B | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class B | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	13.90%
Class B | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7%
Class B | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class B | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class B | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Class C | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.10%
Class C | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class C | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	13.90%
Class C | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7%
Class C | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class C | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class C | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Class R | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.10%
Class R | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class R | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	13.90%
Class R | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7%
Class R | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class R | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class R | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Class R3 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.10%
Class R3 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class R3 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	13.90%
Class R3 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7%
Class R3 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class R3 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class R3 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Class R4 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.10%
Class R4 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class R4 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	13.90%
Class R4 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7%
Class R4 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class R4 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class R4 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Class R5 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.10%
Class R5 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class R5 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	13.90%
Class R5 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7%
Class R5 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class R5 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class R5 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Class R6 | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.10%
Class R6 | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class R6 | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	13.90%
Class R6 | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7%
Class R6 | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class R6 | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class R6 | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Class Y | Putnam ESG Core Bond ETF
Holdings [Line Items]
Percent of Net Asset Value	52.10%
Class Y | Putnam ESG High Yield ETF
Holdings [Line Items]
Percent of Net Asset Value	16.90%
Class Y | Putnam Sustainable Leaders ETF
Holdings [Line Items]
Percent of Net Asset Value	13.90%
Class Y | Putnam Sustainable Future ETF
Holdings [Line Items]
Percent of Net Asset Value	7%
Class Y | Putnam ESG Ultra Short ETF
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Class Y | Putnam Panagora ESG International Equity ETF
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Class Y | Short-Term Fund and Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	0.10%