Ally Financial (ALLY) 10-Q 2 Aug 21 2021 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2021	Jul. 29, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	1-3754
Entity Registrant Name	Ally Financial Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	38-0572512
Entity Address, Address Description	Ally Detroit Center
Entity Address, Address Line One	500 Woodward Avenue
Entity Address, Address Line Two	Floor 10
Entity Address, City or Town	Detroit
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48226
City Area Code	866
Local Phone Number	710-4623
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		360,541,736
Entity Central Index Key	0000040729
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common stock
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	ALLY
Security Exchange Name	NYSE
Trust Preferred Securities Subject to Mandatory Redemption
Entity Information [Line Items]
Title of 12(b) Security	8.125% Fixed Rate/Floating Rate Trust Preferred Securities, Series 2 of GMAC Capital Trust I
Trading Symbol	ALLY PRA
Security Exchange Name	NYSE

Condensed Consolidated Statemen

Condensed Consolidated Statement of Comprehensive Income (unaudited) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financing revenue and other interest income
Interest and fees on finance receivables and loans		$ 1,588	$ 1,630	$ 3,170	$ 3,372
Interest on loans held-for-sale		4	4	9	6
Interest and dividends on investment securities and other earning assets		147	197	278	423
Interest on cash and cash equivalents		4	4	8	18
Operating leases		384	343	754	710
Total financing revenue and other interest income		2,127	2,178	4,219	4,529
Interest expense
Interest on deposits		268	541	574	1,133
Interest on short-term borrowings		0	13	1	30
Interest on long-term debt		230	318	480	666
Total interest expense		498	872	1,055	1,829
Net depreciation expense on operating lease assets		82	252	245	500
Net financing revenue and other interest income		1,547	1,054	2,919	2,200
Other revenue
Insurance premiums and service revenue earned		278	263	558	540
Gain on mortgage and automotive loans, net		19	14	55	2
Loss on extinguishment of debt		(73)	(1)	(74)	(1)
Other gain on investments, net		65	188	188	109
Other income, net of losses		249	91	376	171
Total other revenue		538	555	1,103	821
Total net revenue		2,085	1,609	4,022	3,021
Provision for credit losses		(32)	287	(45)	1,190
Noninterest expense
Compensation and benefits expense		446	334	841	694
Insurance losses and loss adjustment expenses		74	142	137	216
Goodwill impairment		0	50	0	50
Other operating expenses		555	459	1,040	945
Total noninterest expense		1,075	985	2,018	1,905
Income (loss) from continuing operations before income tax expense		1,042	337	2,049	(74)
Income tax expense from continuing operations		143	95	354	3
Net income (loss) from continuing operations		899	242	1,695	(77)
Income (loss) from discontinued operations, net of tax		1	(1)	1	(1)
Net income (loss)		900	241	1,696	(78)
Other comprehensive income (loss), net of tax		189	109	(415)	692
Comprehensive income		$ 1,089	$ 350	$ 1,281	$ 614
Basic earnings per common share
Net income (loss) from continuing operations (in dollars per share)	[1]	$ 2.43	$ 0.65	$ 4.55	$ (0.20)
Net income (loss) (in dollars per share)	[1]	2.43	0.64	4.55	(0.21)
Diluted earnings per common share
Net income (loss) from continuing operations (in dollars per share)	[1],[2]	2.41	0.64	4.52	(0.20)
Net income (loss) (in dollars per share)	[1],[2]	2.41	0.64	4.52	(0.21)
Cash dividends declared per common share (in dollars per share)	[1],[2]	$ 0.19	$ 0.19	$ 0.38	$ 0.38
[1]	Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.
[2]	Due to the antidilutive effect of the net loss from continuing operations for the six months ended June 30, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share.

Condensed Consolidated Balance

Condensed Consolidated Balance Sheet (unaudited) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Cash and cash equivalents
Noninterest-bearing		$ 653	$ 724
Interest-bearing		13,011	14,897
Total cash and cash equivalents		13,664	15,621
Equity securities		1,026	1,071
Available-for-sale securities (amortized cost of $33,781 and $28,936)	[1]	34,161	29,830
Held-to-maturity securities (fair value of $1,173 and $1,331)		1,126	1,253
Loans held-for-sale, net		409	406
Finance receivables and loans, net
Finance receivables and loans, net of unearned income		112,217	118,534
Allowance for loan losses		(3,126)	(3,283)
Total finance receivables and loans, net		109,091	115,251
Investment in operating leases, net		10,715	9,639
Premiums receivable and other insurance assets		2,773	2,679
Other assets		7,505	6,415
Total assets		180,470	182,165
Deposit liabilities
Noninterest-bearing		149	128
Interest-bearing		138,955	136,908
Total deposit liabilities		139,104	137,036
Short-term borrowings		0	2,136
Long-term debt		16,896	22,006
Interest payable		365	412
Unearned insurance premiums and service revenue		3,536	3,438
Accrued expenses and other liabilities		3,039	2,434
Total liabilities		162,940	167,462
Contingencies (refer to Note 23)
Equity
Common stock and paid-in capital ($0.01 par value, shares authorized 1,100,000,000; issued 504,118,452 and 501,237,055; and outstanding 362,638,597 and 374,674,415)		21,631	21,544
Preferred stock		2,324	0
Accumulated deficit		(2,726)	(4,278)
Accumulated other comprehensive income		216	631
Treasury stock, at cost (141,479,855 and 126,562,640 shares)		(3,915)	(3,194)
Total equity		17,530	14,703
Total liabilities and equity		180,470	182,165
On-balance sheet variable interest entities
Finance receivables and loans, net
Allowance for loan losses		(252)	(285)
Total finance receivables and loans, net		9,117	13,213
Other assets		761	983
Total assets		9,878	14,196
Deposit liabilities
Long-term debt		1,847	4,158
Accrued expenses and other liabilities		3	3
Total liabilities		1,850	4,161
On-balance sheet variable interest entities | Consumer
Finance receivables and loans, net
Finance receivables and loans, net of unearned income		7,232	7,630
On-balance sheet variable interest entities | Commercial
Finance receivables and loans, net
Finance receivables and loans, net of unearned income		$ 2,137	$ 5,868
[1]	Refer to Note 6 for discussion of investment securities pledged as collateral.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheet (unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Common stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,100,000,000	1,100,000,000
Common stock, shares issued (in shares)	504,118,452	501,237,055
Common stock, shares outstanding (in shares)	362,638,597	374,674,415
Treasury stock, shares (in shares)	141,479,855	126,562,640
Available-for-sale debt securities | Available-for-sale securities
Debt securities, available-for-sale, amortized cost	$ 33,781	$ 28,936
Held-to-maturity securities
Held-to-maturity securities, fair value	1,173	1,331
Held-to-maturity securities | Held-to-maturity securities
Held-to-maturity securities, fair value	$ 1,173	$ 1,331

Condensed Consolidated Statem_2

Condensed Consolidated Statement of Changes in Equity (unaudited) - USD ($) $ in Millions	Total	Series B Preferred Stock	Series C Preferred Stock	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common stock and paid-in capital	Common stock and paid-in capitalCumulative Effect, Period of Adoption, Adjusted Balance	Preferred stock	Preferred stockSeries B Preferred Stock	Preferred stockSeries C Preferred Stock	Preferred stockCumulative Effect, Period of Adoption, Adjusted Balance	Accumulated deficit	Accumulated deficitCumulative Effect, Period of Adoption, Adjustment	Accumulated deficitCumulative Effect, Period of Adoption, Adjusted Balance	Accumulated other comprehensive income	Accumulated other comprehensive incomeCumulative Effect, Period of Adoption, Adjusted Balance	Treasury stock	Treasury stockCumulative Effect, Period of Adoption, Adjusted Balance
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of Accounting Standards Update 2016-13	$ 14,416			$ (1,017)	$ 13,399	$ 21,438	$ 21,438	$ 0			$ 0	$ (4,057)	$ (1,017)	$ (5,074)	$ 123	$ 123	$ (3,088)	$ (3,088)
Beginning balance at Dec. 31, 2019	14,416			$ (1,017)	$ 13,399	21,438	$ 21,438	0			$ 0	(4,057)	$ (1,017)	$ (5,074)	123	$ 123	(3,088)	$ (3,088)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(78)											(78)
Share-based compensation	61					61
Other comprehensive income (loss)	692														692
Common stock repurchases	(104)																(104)
Common stock dividends	(144)											(144)
Ending balance at Jun. 30, 2020	13,826					21,499		0				(5,296)			815		(3,192)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of Accounting Standards Update 2016-13	13,519					21,470		0				(5,465)			706		(3,192)
Beginning balance at Mar. 31, 2020	13,519					21,470		0				(5,465)			706		(3,192)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	241											241
Share-based compensation	29					29
Other comprehensive income (loss)	109														109
Common stock dividends	(72)											(72)
Ending balance at Jun. 30, 2020	13,826					21,499		0				(5,296)			815		(3,192)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of Accounting Standards Update 2016-13	13,826					21,499		0				(5,296)			815		(3,192)
Adoption of Accounting Standards Update 2016-13	14,703					21,544						(4,278)			631		(3,194)
Beginning balance at Dec. 31, 2020	14,703					21,544						(4,278)			631		(3,194)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,696											1,696
Net proceeds from issuance of series preferred stock		$ 1,335	$ 989						$ 1,335	$ 989
Share-based compensation	87					87
Other comprehensive income (loss)	(415)														(415)
Common stock repurchases	(721)																(721)
Common stock dividends	(144)											(144)
Ending balance at Jun. 30, 2021	17,530					21,631		2,324				(2,726)			216		(3,915)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of Accounting Standards Update 2016-13	14,625					21,566		0				(3,555)			27		(3,413)
Beginning balance at Mar. 31, 2021	14,625					21,566		0				(3,555)			27		(3,413)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	900											900
Net proceeds from issuance of series preferred stock		$ 1,335	$ 989						$ 1,335	$ 989
Share-based compensation	65					65
Other comprehensive income (loss)	189														189
Common stock repurchases	(502)																(502)
Common stock dividends	(71)											(71)
Ending balance at Jun. 30, 2021	17,530					21,631		2,324				(2,726)			216		(3,915)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of Accounting Standards Update 2016-13	$ 17,530					$ 21,631		$ 2,324				$ (2,726)			$ 216		$ (3,915)

Condensed Consolidated Statem_3

Condensed Consolidated Statement of Changes in Equity (unaudited) (Parenthetical) - $ / shares		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share (in dollars per share)	[1],[2]	$ 0.19	$ 0.19	$ 0.38	$ 0.38
[1]	Due to the antidilutive effect of the net loss from continuing operations for the six months ended June 30, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share.
[2]	Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.

Condensed Consolidated Statem_4

Condensed Consolidated Statement of Cash Flows (unaudited) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Operating activities
Net income (loss)		$ 1,696	$ (78)
Reconciliation of net income (loss) to net cash provided by operating activities
Depreciation and amortization		640	802
Goodwill impairment		0	50
Provision for credit losses		(45)	1,190
Gain on mortgage and automotive loans, net		(55)	(2)
Other gain on investments, net		(188)	(109)
Loss on extinguishment of debt		74	1
Originations and purchases of loans held-for-sale		(2,154)	(1,329)
Proceeds from sales and repayments of loans held-for-sale		2,230	1,167
Net change in
Deferred income taxes		(675)	0
Interest payable		(48)	56
Other assets		2	(420)
Other liabilities		231	(211)
Other, net		(86)	45
Net cash provided by operating activities		1,622	1,162
Investing activities
Purchases of equity securities		(724)	(740)
Proceeds from sales of equity securities		944	774
Purchases of available-for-sale securities		(14,376)	(7,696)
Proceeds from sales of available-for-sale securities		2,788	5,544
Proceeds from repayments of available-for-sale securities		6,539	4,440
Purchases of held-to-maturity securities		(97)	0
Proceeds from repayments of held-to-maturity securities		223	177
Purchases of finance receivables and loans held-for-investment		(3,500)	(3,495)
Proceeds from sales of finance receivables and loans initially held-for-investment		376	1
Originations and repayments of finance receivables and loans held-for-investment and other, net		9,095	13,135
Purchases of operating lease assets		(3,026)	(1,949)
Disposals of operating lease assets		1,775	1,179
Net change in nonmarketable equity investments		93	148
Other, net		(201)	(213)
Net cash (used in) provided by investing activities		(91)	11,305
Financing activities
Net change in short-term borrowings		(2,136)	(1,842)
Net increase in deposits		2,060	10,272
Proceeds from issuance of long-term debt		194	2,372
Repayments of long-term debt		(3,800)	(7,434)
Repurchases of common stock		(721)	(104)
Preferred stock issuance		2,326	0
Trust preferred securities redemption		(1,442)	0
Dividends paid		(144)	(144)
Net cash (used in) provided by financing activities		(3,663)	3,120
Effect of exchange-rate changes on cash and cash equivalents and restricted cash		3	(3)
Net (decrease) increase in cash and cash equivalents and restricted cash		(2,129)	15,584
Cash and cash equivalents and restricted cash at beginning of year		16,574	4,380
Cash and cash equivalents and restricted cash at June 30,		14,445	19,964
Supplemental disclosures
Interest		1,057	1,722
Income taxes		1,212	7
Loans held-for-sale transferred to finance receivables and loans held-for-investment		5	70
Additions of property and equipment		46	0
Finance receivables and loans held-for-investment transferred to loans held-for-sale		414	0
In-kind distribution from equity-method investee		0	60
Equity consideration received in exchange for restructured loans		0	5
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents on the Condensed Consolidated Balance Sheet		13,664	19,131
Restricted cash included in other assets on the Condensed Consolidated Balance Sheet	[1]	781	833
Total cash and cash equivalents and restricted cash in the Condensed Consolidated Statement of Cash Flows		$ 14,445	$ 19,964
[1]	Restricted cash balances relate primarily to Ally securitization arrangements. Refer to Note 10 for additional details describing the nature of restricted cash balances.

Description of Business, Basis

Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies	Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies Ally Financial Inc. (together with its consolidated subsidiaries unless the context otherwise requires, Ally, the Company, we, us, or our) is a digital financial-services company committed to its promise to “Do It Right” for its consumer, commercial, and corporate customers. Ally is composed of an industry-leading independent automotive finance and insurance operation, an award-winning digital direct bank (Ally Bank, Member FDIC and Equal Housing Lender, which offers mortgage lending, point-of-sale personal lending, and a variety of deposit and other banking products), a corporate finance business for equity sponsors and middle-market companies, and securities brokerage and investment advisory services. A relentless ally for all things money, Ally helps people save well and earn well, so they can spend for what matters. We are a Delaware corporation and are registered as a BHC under the BHC Act, and an FHC under the GLB Act. Our accounting and reporting policies conform to U.S. GAAP. Additionally, where applicable, the policies conform to the accounting and reporting guidelines prescribed by bank regulatory authorities. Certain reclassifications may have been made to the prior periods’ financial statements and notes to conform to the current period’s presentation, which did not have a material impact on our Condensed Consolidated Financial Statements. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and that affect income and expenses during the reporting period and related disclosures. In developing the estimates and assumptions, management uses all available evidence; however, actual results could differ because of uncertainties associated with estimating the amounts, timing, and likelihood of possible outcomes. Our most significant estimates pertain to the allowance for loan losses, valuations of automotive lease assets and residuals, fair value of financial instruments, and the determination of the provision for income taxes. The Condensed Consolidated Financial Statements at June 30, 2021, and for the three months and six months ended June 30, 2021, and 2020, are unaudited but reflect all adjustments that are, in management’s opinion, necessary for the fair presentation of the results for the interim periods presented. All such adjustments are of a normal recurring nature. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements (and the related Notes) included in our Annual Report on Form 10-K for the year ended December 31, 2020, as filed on February 24, 2021, with the SEC. Significant Accounting Policies Income Taxes In calculating the provision for interim income taxes, in accordance with ASC 740, Income Taxes , we apply an estimated annual effective tax rate to year-to-date ordinary income. At the end of each interim period, we estimate the effective tax rate expected to be applicable for the full fiscal year. This method differs from that described in Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K, which describes our annual significant income tax accounting policy and related methodology. Refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K regarding additional significant accounting policies. Recently Adopted Accounting Standards Reference Rate Reform (ASU 2021-01) In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848) : Scope , which clarified the scope of ASU 2020-04, Reference Rate Reform: Facilitation of the Effects of Reference Rate Reform on Financial Reporting , indicating that certain optional expedients and exceptions included in ASU 2020-04 are applicable to derivative instruments affected by the market-wide change in interest rates used for discounting, margining, or contract price alignment. We adopted the amendments in this ASU immediately upon issuance in January 2021 on a prospective basis and will apply this guidance, along with the guidance from ASU 2020-04, as contracts are modified through December 2022. The adoption did not have an immediate direct impact on our financial statements. We do not expect there to be a material impact to our financial statements.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers Our primary revenue sources, which include financing revenue and other interest income, are addressed by other GAAP and are not in the scope of ASC Topic 606, Revenue from Contracts with Customers. As part of our Insurance operations, we recognize revenue from insurance contracts, which are addressed by other GAAP and are not included in the scope of this standard. Certain noninsurance contracts within our Insurance operations, including VSCs, GAP contracts, and VMCs, are included in the scope of this standard. All revenue associated with noninsurance contracts is recognized over the contract term on a basis proportionate to the anticipated cost emergence. Further, commissions and sales expense incurred to obtain these contracts are amortized over the terms of the related policies and service contracts on the same basis as premiums and service revenue are earned, and all advertising costs are recognized as expense when incurred. The following tables present a disaggregated view of our revenue from contracts with customers. For further information regarding our revenue recognition policies and details about the nature of our respective revenue streams, refer to Note 1 and Note 3 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K. Three months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated 2021 Revenue from contracts with customers Noninsurance contracts (a) (b) (c) $ — $ 158 $ — $ — $ — $ 158 Remarketing fee income 27 — — — — 27 Brokerage commissions and other revenue — — — — 13 13 Deposit account and other banking fees (d) — — — — 5 5 Brokered/agent commissions — 4 — — — 4 Other 6 — — — 2 8 Total revenue from contracts with customers 33 162 — — 20 215 All other revenue 28 182 22 33 58 323 Total other revenue (e) $ 61 $ 344 $ 22 $ 33 $ 78 $ 538 2020 Revenue from contracts with customers Noninsurance contracts (a) (b) (c) $ — $ 142 $ — $ — $ — $ 142 Remarketing fee income 15 — — — — 15 Brokerage commissions and other revenue — — — — 14 14 Deposit account and other banking fees (d) — — — — 1 1 Brokered/agent commissions — 4 — — — 4 Other 3 — — — — 3 Total revenue from contracts with customers 18 146 — — 15 179 All other revenue 22 292 19 6 37 376 Total other revenue (e) $ 40 $ 438 $ 19 $ 6 $ 52 $ 555 (a) We had opening balances of $3.0 billion and $2.9 billion in unearned revenue associated with outstanding contracts at April 1, 2021, and April 1, 2020, respectively, and $228 million and $211 million of these balances were recognized as insurance premiums and service revenue earned in our Condensed Consolidated Statement of Comprehensive Income during the three months ended June 30, 2021, and June 30, 2020, respectively. (b) At June 30, 2021, we had unearned revenue of $3.1 billion associated with outstanding contracts, and with respect to this balance we expect to recognize revenue of $423 million during the remainder of 2021, $789 million in 2022, $700 million in 2023, $531 million in 2024, and $628 million thereafter. At June 30, 2020, we had unearned revenue of $2.9 billion associated with outstanding contracts. (c) We had deferred insurance assets of $1.8 billion and $1.9 billion at April 1, 2021, and June 30, 2021, respectively, and recognized $133 million of expense during the three months ended June 30, 2021. We had deferred insurance assets of $1.7 billion and $1.8 billion at April 1, 2020, and June 30, 2020, respectively, and recognized $121 million of expense during the three months ended June 30, 2020. (d) Reflects various services fees we charge depositors. Effective May 25, 2021, we eliminated all overdraft fees for Ally Bank deposit accounts. (e) Represents a component of total net revenue. Refer to Note 22 for further information on our reportable operating segments. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated 2021 Revenue from contracts with customers Noninsurance contracts (a) (b) $ — $ 313 $ — $ — $ — $ 313 Remarketing fee income 54 — — — — 54 Brokerage commissions and other revenue — — — — 33 33 Deposit account and other banking fees (c) — — — — 11 11 Brokered/agent commissions — 8 — — — 8 Other 12 — — — 2 14 Total revenue from contracts with customers 66 321 — — 46 433 All other revenue 57 402 62 59 90 670 Total other revenue (d) $ 123 $ 723 $ 62 $ 59 $ 136 $ 1,103 2020 Revenue from contracts with customers Noninsurance contracts (a) (b) $ — $ 285 $ — $ — $ — $ 285 Remarketing fee income 32 — — — — 32 Brokerage commissions and other revenue — — — — 27 27 Deposit account and other banking fees (c) — — — — 5 5 Brokered/agent commissions — 8 — — — 8 Other 8 — — — — 8 Total revenue from contracts with customers 40 293 — — 32 365 All other revenue 47 282 29 19 79 456 Total other revenue (d) $ 87 $ 575 $ 29 $ 19 $ 111 $ 821 (a) We had opening balances of $3.0 billion and $2.9 billion in unearned revenue associated with outstanding contracts at January 1, 2021, and January 1, 2020, respectively, and $453 million and $425 million of these balances were recognized as insurance premiums and service revenue earned in our Condensed Consolidated Statement of Comprehensive Income during the six months ended June 30, 2021, and June 30, 2020. (b) We had deferred insurance assets of $1.8 billion and $1.9 billion at January 1, 2021, and June 30, 2021, respectively, and recognized $265 million of expense during the six months ended June 30, 2021. We had deferred insurance assets of $1.7 billion and $1.8 billion at January 1, 2020, and June 30, 2020, respectively, and recognized $246 million of expense during the six months ended June 30, 2020. (c) Reflects various services fees we charge depositors. Effective May 25, 2021, we eliminated all overdraft fees for Ally Bank deposit accounts. (d) Represents a component of total net revenue. Refer to Note 22 for further information on our reportable operating segments. In addition to the components of other revenue presented above, as part of our Automotive Finance operations, we recognized net remarketing gains of $128 million and $192 million for the three months and six months ended June 30, 2021, respectively, and net remarketing losses of $11 million and $9 million for the three months and six months ended June 30, 2020, respectively, on the sale of off-lease vehicles. These gains and losses are included in depreciation expense on operating lease assets in our Condensed Consolidated Statement of Comprehensive Income.

Other Income, Net of Losses

Other Income, Net of Losses	6 Months Ended
	Jun. 30, 2021
Other Nonoperating Income (Expense) [Abstract]
Other Income, Net of Losses	Other Income, Net of Losses Details of other income, net of losses, were as follows. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Gain (loss) on nonmarketable equity investments, net $ 99 $ (4) $ 103 $ (4) Late charges and other administrative fees 29 16 60 37 Remarketing fees 27 15 54 32 Income from equity-method investments 31 53 45 52 Other, net 63 11 114 54 Total other income, net of losses $ 249 $ 91 $ 376 $ 171

Reserves for Insurance Losses a

Reserves for Insurance Losses and Loss Adjustment Expenses	6 Months Ended
	Jun. 30, 2021
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]
Reserves for Insurance Losses and Loss Adjustment Expenses	Reserves for Insurance Losses and Loss Adjustment Expenses The following table shows a rollforward of our reserves for insurance losses and loss adjustment expenses. ($ in millions) 2021 2020 Total gross reserves for insurance losses and loss adjustment expenses at January 1, $ 129 $ 122 Less: Reinsurance recoverable 90 88 Net reserves for insurance losses and loss adjustment expenses at January 1, 39 34 Net insurance losses and loss adjustment expenses incurred related to: Current year 136 215 Prior years (a) 1 1 Total net insurance losses and loss adjustment expenses incurred 137 216 Net insurance losses and loss adjustment expenses paid or payable related to: Current year (108) (178) Prior years (27) (26) Total net insurance losses and loss adjustment expenses paid or payable (135) (204) Net reserves for insurance losses and loss adjustment expenses at June 30, 41 46 Plus: Reinsurance recoverable 85 86 Total gross reserves for insurance losses and loss adjustment expenses at June 30, $ 126 $ 132 (a) There have been no material adverse changes to the reserve for prior years.

Other Operating Expenses

Other Operating Expenses	6 Months Ended
	Jun. 30, 2021
Operating Expenses [Abstract]
Other Operating Expenses	Other Operating Expenses Details of other operating expenses were as follows. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Insurance commissions $ 138 $ 127 $ 274 $ 253 Technology and communications 81 80 159 159 Lease and loan administration 57 46 112 84 Advertising and marketing 45 32 86 76 Property and equipment depreciation 38 34 74 68 Professional services 28 28 61 59 Charitable contributions 54 3 55 4 Vehicle remarketing and repossession 17 11 38 34 Regulatory and licensing fees 17 29 35 58 Occupancy 18 13 33 29 Non-income taxes 9 7 15 14 Amortization of intangible assets 4 5 9 10 Other 49 44 89 97 Total other operating expenses $ 555 $ 459 $ 1,040 $ 945

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Our investment portfolio includes various debt and equity securities. Our debt securities, which are classified as available-for-sale or held-to-maturity, include government securities, corporate bonds, asset-backed securities, and mortgage-backed securities. The cost, fair value, and gross unrealized gains and losses on available-for-sale and held-to-maturity securities were as follows. June 30, 2021 December 31, 2020 Amortized cost Gross unrealized Fair value Amortized cost Gross unrealized Fair value ($ in millions) gains losses gains losses Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ 2,153 $ 12 $ (17) $ 2,148 $ 783 $ 20 $ — $ 803 U.S. States and political subdivisions 989 37 (2) 1,024 1,046 50 (1) 1,095 Foreign government 181 4 (1) 184 167 9 — 176 Agency mortgage-backed residential 20,615 343 (123) 20,835 18,053 538 (3) 18,588 Mortgage-backed residential 2,890 25 (5) 2,910 2,595 49 (4) 2,640 Agency mortgage-backed commercial 4,355 109 (59) 4,405 4,063 139 (13) 4,189 Asset-backed 552 3 — 555 420 5 — 425 Corporate debt 2,046 63 (9) 2,100 1,809 105 — 1,914 Total available-for-sale securities (a) (b) (c) (d) (e) $ 33,781 $ 596 $ (216) $ 34,161 $ 28,936 $ 915 $ (21) $ 29,830 Held-to-maturity securities Debt securities Agency mortgage-backed residential $ 1,126 $ 57 $ (10) $ 1,173 $ 1,253 $ 79 $ (1) $ 1,331 Total held-to-maturity securities (e) (f) $ 1,126 $ 57 $ (10) $ 1,173 $ 1,253 $ 79 $ (1) $ 1,331 (a) Certain entities related to our Insurance operations are required to deposit securities with state regulatory authorities. These deposited securities totaled $13 million at both June 30, 2021, and December 31, 2020. (b) Certain available-for-sale securities are included in fair value hedging relationships. Refer to Note 18 for additional information. (c) Available-for-sale securities with a fair value of $151 million and $145 million at June 30, 2021, and December 31, 2020, respectively, were pledged for purposes as required by contractual obligation or law. Under these agreements, we granted the counterparty the right to sell or pledge the underlying investment securities. (d) Totals do not include accrued interest receivable, which was $90 million at both June 30, 2021, and December 31, 2020. Accrued interest receivable is included in other assets on our Condensed Consolidated Balance Sheet. (e) There was no allowance for credit losses recorded at June 30, 2021, or December 31, 2020, as management determined that there were no expected credit losses in our portfolio of available-for-sale and held-to-maturity securities. (f) Totals do not include accrued interest receivable, which was $3 million at both June 30, 2021, and December 31, 2020. Accrued interest receivable is included in other assets on our Condensed Consolidated Balance Sheet. The maturity distribution of debt securities outstanding is summarized in the following tables based upon contractual maturities. Call or prepayment options may cause actual maturities to differ from contractual maturities. Total Due in one year or less Due after one year through five years Due after five years through ten years Due after ten years ($ in millions) Amount Yield Amount Yield Amount Yield Amount Yield Amount Yield June 30, 2021 Fair value of available-for-sale securities (a) U.S. Treasury and federal agencies $ 2,148 1.1 % $ 12 1.6 % $ 510 0.9 % $ 1,626 1.2 % $ — — % U.S. States and political subdivisions 1,024 3.0 51 2.5 102 2.4 212 2.7 659 3.2 Foreign government 184 1.9 13 2.1 106 2.0 65 1.8 — — Agency mortgage-backed residential 20,835 2.6 — — — — 31 2.0 20,804 2.6 Mortgage-backed residential 2,910 2.8 — — — — 28 2.9 2,882 2.8 Agency mortgage-backed commercial 4,405 1.9 — — — — 1,753 2.3 2,652 1.7 Asset-backed 555 2.1 — — 350 2.5 194 1.4 11 3.2 Corporate debt 2,100 2.4 103 2.7 849 2.4 1,147 2.4 1 1.7 Total available-for-sale securities $ 34,161 2.4 $ 179 2.5 $ 1,917 2.0 $ 5,056 1.9 $ 27,009 2.5 Amortized cost of available-for-sale securities $ 33,781 $ 178 $ 1,874 $ 4,945 $ 26,784 Amortized cost of held-to-maturity securities Agency mortgage-backed residential $ 1,126 2.9 % $ — — % $ — — % $ — — % $ 1,126 2.9 % Total held-to-maturity securities $ 1,126 2.9 $ — — $ — — $ — — $ 1,126 2.9 December 31, 2020 Fair value of available-for-sale securities (a) U.S. Treasury and federal agencies $ 803 1.2 % $ 13 0.1 % $ 708 1.1 % $ 82 1.7 % $ — — % U.S. States and political subdivisions 1,095 3.0 49 1.4 103 2.3 228 2.7 715 3.3 Foreign government 176 2.1 9 1.7 86 2.3 81 1.9 — — Agency mortgage-backed residential 18,588 3.1 — — — — 37 2.0 18,551 3.1 Mortgage-backed residential 2,640 3.1 — — — — 36 2.9 2,604 3.1 Agency mortgage-backed commercial 4,189 1.9 — — — — 1,628 2.3 2,561 1.7 Asset-backed 425 2.9 — — 349 3.0 49 1.8 27 3.1 Corporate debt 1,914 2.7 155 2.7 625 2.9 1,077 2.6 57 2.1 Total available-for-sale securities $ 29,830 2.8 $ 226 2.3 $ 1,871 2.2 $ 3,218 2.4 $ 24,515 3.0 Amortized cost of available-for-sale securities $ 28,936 $ 224 $ 1,808 $ 3,022 $ 23,882 Amortized cost of held-to-maturity securities Agency mortgage-backed residential $ 1,253 3.0 % $ — — % $ — — % $ — — % $ 1,253 3.0 % Total held-to-maturity securities $ 1,253 3.0 $ — — $ — — $ — — $ 1,253 3.0 (a) Yield is calculated using the effective yield of each security at the end of the period, weighted based on the market value. The effective yield considers the contractual coupon and amortized cost, and excludes expected capital gains and losses. The balances of cash equivalents were $42 million and $25 million at June 30, 2021, and December 31, 2020, respectively, and were composed primarily of money-market funds and short-term securities, including U.S. Treasury bills. The following table presents interest and dividends on investment securities. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Taxable interest $ 131 $ 177 $ 245 $ 382 Taxable dividends 7 5 12 10 Interest and dividends exempt from U.S. federal income tax 5 5 10 8 Interest and dividends on investment securities $ 143 $ 187 $ 267 $ 400 The following table presents gross gains and losses realized upon the sales of available-for-sale securities, and net gains or losses on equity securities held during the period. Three months ended June 30, Six months ended June 30, ( $ in millions) 2021 2020 2021 2020 Available-for-sale securities Gross realized gains $ 6 $ 19 $ 38 $ 124 Net realized gains on available-for-sale securities 6 19 38 124 Net realized gain on equity securities 40 80 114 81 Net unrealized gain (loss) on equity securities 19 89 36 (96) Other gain on investments, net $ 65 $ 188 $ 188 $ 109 The following table presents the credit quality of our held-to-maturity securities, based on the latest available information as of June 30, 2021, and December 31, 2020. The credit ratings are sourced from nationally recognized statistical rating organizations, which include S&P, Moody’s, and Fitch. They represent a composite of the ratings or, where credit ratings cannot be sourced from the agencies, are presented based on the asset type. All of our held-to-maturity securities were current in their payment of principal and interest as of June 30, 2021, and December 31, 2020. We have not recorded any interest income reversals on our held-to-maturity securities during the six months ended June 30, 2021, or 2020. June 30, 2021 December 31, 2020 ($ in millions) AA Total (a) AA Total (a) Debt securities Agency mortgage-backed residential $ 1,126 $ 1,126 $ 1,253 $ 1,253 Total held-to-maturity securities $ 1,126 $ 1,126 $ 1,253 $ 1,253 (a) Rating agencies indicate that they base their ratings on many quantitative and qualitative factors, which may include capital adequacy, liquidity, asset quality, business mix, level and quality of earnings, and the current operating, legislative, and regulatory environment. A credit rating is not a recommendation to buy, sell, or hold securities, and the ratings are subject to revision or withdrawal at any time by the assigning rating agency. The following table summarizes available-for-sale securities in an unrealized loss position, which we evaluated to determine if a credit loss exists requiring the recognition of an allowance for credit losses. For additional information on our methodology, refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K. As of June 30, 2021, and December 31, 2020, we did not have the intent to sell the available-for-sale securities with an unrealized loss position and we do not believe it is more likely than not that we will be required to sell these securities before recovery of their amortized cost basis. As a result of this evaluation, management determined that no credit reserves were required at June 30, 2021, or December 31, 2020. We have not recorded any interest income reversals on our available-for-sale securities during the six months ended June 30, 2021, or 2020. June 30, 2021 December 31, 2020 Less than 12 months 12 months or longer Less than 12 months 12 months or longer ($ in millions) Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ 871 $ (17) $ — $ — $ 3 $ — $ — $ — U.S. States and political subdivisions 121 (2) — — 83 (1) — — Foreign government 57 (1) — — 7 — — — Agency mortgage-backed residential 8,530 (123) — — 1,225 (3) — — Mortgage-backed residential 1,109 (5) 4 — 316 (4) — — Agency mortgage-backed commercial 2,764 (59) — — 926 (13) — — Asset-backed 103 — — — 11 — — — Corporate debt 586 (9) 1 — 59 — 5 — Total available-for-sale securities $ 14,141 $ (216) $ 5 $ — $ 2,630 $ (21) $ 5 $ — During the three months and six months ended June 30, 2021, and 2020, management determined that there were no expected credit losses for securities in an unrealized loss position. This analysis considered a variety of factors including, but not limited to, performance indicators of the issuer, default rates, industry analyst reports, credit ratings, and other relevant information, which indicated that contractual cash flows are expected to occur.

Finance Receivables and Loans,

Finance Receivables and Loans, Net	6 Months Ended
	Jun. 30, 2021
Receivables [Abstract]
Finance Receivables and Loans, Net	Finance Receivables and Loans, Net The composition of finance receivables and loans reported at amortized cost basis was as follows. ($ in millions) June 30, 2021 December 31, 2020 Consumer automotive (a) $ 75,951 $ 73,668 Consumer mortgage Mortgage Finance (b) 13,629 14,632 Mortgage — Legacy (c) 429 495 Total consumer mortgage 14,058 15,127 Consumer other (d) 640 407 Total consumer 90,649 89,202 Commercial Commercial and industrial Automotive 11,303 19,082 Other 5,442 5,242 Commercial real estate 4,823 5,008 Total commercial 21,568 29,332 Total finance receivables and loans (e) (f) $ 112,217 $ 118,534 (a) Certain finance receivables and loans are included in fair value hedging relationships. Refer to Note 18 for additional information. (b) Includes loans originated as interest-only mortgage loans of $6 million and $8 million at June 30, 2021, and December 31, 2020, respectively. All of these loans have exited the interest-only period. (c) Includes loans originated as interest-only mortgage loans of $25 million and $30 million at June 30, 2021, and December 31, 2020, respectively, of which 99% have exited the interest-only period. (d) Includes $8 million of finance receivables at both June 30, 2021, and December 31, 2020, for which we have elected the fair value option. (e) Totals include net unearned income, unamortized premiums and discounts, and deferred fees and costs of $2.2 billion and $2.0 billion at June 30, 2021, and December 31, 2020, respectively. (f) Totals do not include accrued interest receivable, which was $475 million and $587 million at June 30, 2021, and December 31, 2020, respectively. Accrued interest receivable is included in other assets on our Condensed Consolidated Balance Sheet. The following tables present an analysis of the activity in the allowance for loan losses on finance receivables and loans for the three months and six months ended June 30, 2021. Three months ended June 30, 2021 ($ in millions) Consumer automotive Consumer mortgage Consumer other (a) Commercial Total Allowance at April 1, 2021 $ 2,809 $ 26 $ 69 $ 248 $ 3,152 Charge-offs (b) (183) (2) (5) (7) (197) Recoveries 188 3 1 11 203 Net charge-offs 5 1 (4) 4 6 Provision for credit losses (12) (4) 8 (24) (32) Other — 1 (1) — — Allowance at June 30, 2021 $ 2,802 $ 24 $ 72 $ 228 $ 3,126 (a) Excludes $8 million of finance receivables at both April 1, 2021, and June 30, 2021, for which we have elected the fair value option. (b) Refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for information regarding our charge-off policies. Six months ended June 30, 2021 ($ in millions) Consumer automotive Consumer mortgage Consumer other (a) Commercial Total Allowance at January 1, 2021 $ 2,902 $ 33 $ 73 $ 275 $ 3,283 Charge-offs (b) (467) (4) (13) (21) (505) Recoveries 375 6 1 11 393 Net charge-offs (92) 2 (12) (10) (112) Provision for credit losses (8) (11) 11 (37) (45) Other — — — — — Allowance at June 30, 2021 $ 2,802 $ 24 $ 72 $ 228 $ 3,126 (a) Excludes $8 million of finance receivables at both June 30, 2021, and December 31, 2020, for which we have elected the fair value option. (b) Refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for information regarding our charge-off policies. Three months ended June 30, 2020 ($ in millions) Consumer automotive Consumer mortgage Consumer other (a) Commercial Total Allowance at April 1, 2020 $ 2,833 $ 39 $ 45 $ 328 $ 3,245 Charge-offs (b) (245) (2) (4) (40) (291) Recoveries 108 4 — 1 113 Net charge-offs (137) 2 (4) (39) (178) Provision for credit losses 269 1 6 11 287 Other (2) — 2 — — Allowance at June 30, 2020 $ 2,963 $ 42 $ 49 $ 300 $ 3,354 (a) Excludes $10 million and $8 million of finance receivables at April 1, 2020, and June 30, 2020, respectively, for which we have elected the fair value option. (b) Refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for information regarding our charge-off policies. Six months ended June 30, 2020 ($ in millions) Consumer automotive Consumer mortgage Consumer other (a) Commercial Total Allowance at December 31, 2019 $ 1,075 $ 46 $ 9 $ 133 $ 1,263 Cumulative effect of the adoption of Accounting Standards Update 2016-13 1,334 (6) 16 2 1,346 Allowance at January 1, 2020 2,409 40 25 135 2,609 Charge-offs (b) (618) (5) (9) (43) (675) Recoveries 219 9 1 2 231 Net charge-offs (399) 4 (8) (41) (444) Provision for credit losses 954 (2) 31 207 1,190 Other (1) — 1 (1) (1) Allowance at June 30, 2020 $ 2,963 $ 42 $ 49 $ 300 $ 3,354 (a) Excludes $8 million and $11 million of finance receivables at June 30, 2020, and December 31, 2019, respectively, for which we have elected the fair value option. (b) Refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for information regarding our charge-off policies. The following table presents information about significant sales of finance receivables and loans and transfers of finance receivables and loans from held for investment to held for sale based on net carrying value. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Consumer mortgage $ 84 — $ 413 $ — Total sales and transfers $ 84 $ — $ 413 $ — The following table presents information about significant purchases of finance receivables and loans based on unpaid principal balance at the time of purchase. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Consumer automotive $ 727 $ 635 $ 1,304 $ 995 Consumer mortgage 1,744 1,870 1,932 2,354 Commercial — 1 — 1 Total purchases of finance receivables and loans $ 2,471 $ 2,506 $ 3,236 $ 3,350 Nonaccrual Loans The following tables present the amortized cost of our finance receivables and loans on nonaccrual status. All consumer or commercial finance receivables and loans that were 90 days or more past due were on nonaccrual status as of June 30, 2021, and December 31, 2020. June 30, 2021 ($ in millions) Nonaccrual status at Jan. 1, 2021 Nonaccrual status at Apr. 1, 2021 Nonaccrual status Nonaccrual with no allowance (a) Consumer automotive $ 1,256 $ 1,173 $ 1,033 $ 472 Consumer mortgage Mortgage Finance 67 63 49 26 Mortgage — Legacy 35 32 27 25 Total consumer mortgage 102 95 76 51 Consumer other 3 2 2 — Total consumer 1,361 1,270 1,111 523 Commercial Commercial and industrial Automotive 40 17 33 4 Other 116 150 133 51 Commercial real estate 5 2 6 6 Total commercial 161 169 172 61 Total finance receivables and loans $ 1,522 $ 1,439 $ 1,283 $ 584 (a) Represents a component of nonaccrual status at end of period. December 31, 2020 ($ in millions) Nonaccrual status at Jan. 1, 2020 Nonaccrual status at Apr. 1, 2020 Nonaccrual status Nonaccrual with no allowance (a) Consumer automotive $ 762 $ 1,077 $ 1,256 $ 604 Consumer mortgage Mortgage Finance 17 22 67 18 Mortgage — Legacy 40 40 35 28 Total consumer mortgage 57 62 102 46 Consumer other 2 1 3 — Total consumer 821 1,140 1,361 650 Commercial Commercial and industrial Automotive 73 86 40 10 Other 138 162 116 41 Commercial real estate 4 8 5 5 Total commercial 215 256 161 56 Total finance receivables and loans $ 1,036 $ 1,396 $ 1,522 $ 706 (a) Represents a component of nonaccrual status at end of period. We recorded interest income from cash payments associated with finance receivables and loans in nonaccrual status of $3 million and $5 million for the three months and six months ended June 30, 2021, respectively, compared to $4 million and $6 million for the three months and six months ended June 30, 2020, respectively. Credit Quality Indicators We evaluate the credit quality of our consumer loan portfolio based on the aging status of the loan and by payment activity. Loan delinquency reporting is generally based upon borrower payment activity, relative to the contractual terms of the loan. In accordance with regulatory guidance, if borrowers are less than 30 days past due on their loans and enter into loan modifications offered as a result of COVID-19, their loans generally continue to be considered performing loans and continue to accrue interest during the period of the loan modification. For borrowers who are 30 days or more past due when entering into loan modifications offered as a result of COVID-19, we evaluate the loan modifications under our existing troubled debt restructuring framework, and where such a loan modification would result in a concession to a borrower experiencing financial difficulty, the loan is accounted for as a TDR and generally will not accrue interest. The following tables present the amortized cost basis of our consumer finance receivables and loans by credit quality indicator based on delinquency status and origination year. Origination year Revolving loans converted to term June 30, 2021 ($ in millions) 2021 2020 2019 2018 2017 2016 and prior Revolving loans Total Consumer automotive Current $ 19,187 $ 22,144 $ 15,212 $ 9,239 $ 5,073 $ 3,344 $ — $ — $ 74,199 30–59 days past due 69 280 332 244 157 139 — — 1,221 60–89 days past due 14 71 94 66 40 33 — — 318 90 or more days past due 4 35 58 45 33 38 — — 213 Total consumer automotive 19,274 22,530 15,696 9,594 5,303 3,554 — — 75,951 Consumer mortgage Mortgage Finance Current 3,754 2,862 1,430 1,059 1,420 3,002 — — 13,527 30–59 days past due 22 8 5 3 5 17 — — 60 60–89 days past due — — — 2 — 3 — — 5 90 or more days past due — 1 3 9 4 20 — — 37 Total Mortgage Finance 3,776 2,871 1,438 1,073 1,429 3,042 — — 13,629 Mortgage — Legacy Current — — — — — 98 274 30 402 30–59 days past due — — — — — 2 2 — 4 60–89 days past due — — — — — 2 — — 2 90 or more days past due — — — — — 16 4 1 21 Total Mortgage — Legacy — — — — — 118 280 31 429 Total consumer mortgage 3,776 2,871 1,438 1,073 1,429 3,160 280 31 14,058 Consumer other Current 376 205 31 8 2 — — — 622 30–59 days past due 2 2 1 — — — — — 5 60–89 days past due 1 2 — — — — — — 3 90 or more days past due 1 1 — — — — — — 2 Total consumer other (a) 380 210 32 8 2 — — — 632 Total consumer $ 23,430 $ 25,611 $ 17,166 $ 10,675 $ 6,734 $ 6,714 $ 280 $ 31 $ 90,641 (a) Excludes $8 million of finance receivables at June 30, 2021, for which we have elected the fair value option. Origination year Revolving loans converted to term December 31, 2020 ($ in millions) 2020 2019 2018 2017 2016 2015 and prior Revolving loans Total Consumer automotive Current $ 27,255 $ 19,204 $ 12,129 $ 7,060 $ 3,678 $ 1,766 $ — $ — $ 71,092 30–59 days past due 281 466 376 264 174 97 — — 1,658 60–89 days past due 66 165 129 88 55 32 — — 535 90 or more days past due 32 108 96 71 46 30 — — 383 Total consumer automotive 27,634 19,943 12,730 7,483 3,953 1,925 — — 73,668 Consumer mortgage Mortgage Finance Current 3,432 2,410 1,744 2,254 1,177 3,492 — — 14,509 30–59 days past due 10 9 10 11 7 16 — — 63 60–89 days past due 1 1 3 2 1 3 — — 11 90 or more days past due 1 5 8 10 4 21 — — 49 Total Mortgage Finance 3,444 2,425 1,765 2,277 1,189 3,532 — — 14,632 Mortgage — Legacy Current — — — — — 121 303 36 460 30–59 days past due — — — — — 4 2 — 6 60–89 days past due — — — — — 2 — — 2 90 or more days past due — — — — — 20 5 2 27 Total Mortgage — Legacy — — — — — 147 310 38 495 Total consumer mortgage 3,444 2,425 1,765 2,277 1,189 3,679 310 38 15,127 Consumer other Current 306 53 13 4 1 — — — 377 30–59 days past due 9 3 1 — — — — — 13 60–89 days past due 4 1 — 1 — — — — 6 90 or more days past due 2 1 — — — — — — 3 Total consumer other (a) 321 58 14 5 1 — — — 399 Total consumer $ 31,399 $ 22,426 $ 14,509 $ 9,765 $ 5,143 $ 5,604 $ 310 $ 38 $ 89,194 (a) Excludes $8 million of finance receivables at December 31, 2020, for which we have elected the fair value option. We evaluate the credit quality of our commercial loan portfolio using regulatory risk ratings, which are based on relevant information about the borrower’s financial condition, including current financial information, historical payment experience, credit documentation, and current economic trends, among other factors. We use the following definitions for risk rankings. • Special mention — Loans that have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or the institution’s credit position at some future date. • Substandard — Loans that are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. These loans have a well-defined weakness or weakness that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. • Doubtful — Loans that have all the weaknesses inherent in those classified as substandard, with the additional characteristic that the weaknesses make collection or liquidation in full, based on the basis of currently existing facts, conditions, and values, highly questionable and improbable. The regulatory risk classification utilized is influenced by internal credit risk ratings, which are based on a variety of factors. A borrower’s internal credit risk rating is updated at least annually, and more frequently when a borrower’s credit profile changes, including when we become aware of potential credit deterioration. The following tables present the amortized cost basis of our commercial finance receivables and loans by credit quality indicator based on risk rating and origination year. Origination year Revolving loans converted to term June 30, 2021 ($ in millions) 2021 2020 2019 2018 2017 2016 and prior Revolving loans Total Commercial and industrial Automotive Pass $ 218 $ 353 $ 201 $ 45 $ 52 $ 73 $ 9,261 $ — $ 10,203 Special mention 12 9 23 41 38 37 887 — 1,047 Substandard — 1 — 1 — 2 49 — 53 Doubtful — — — — — — — — — Total automotive 230 363 224 87 90 112 10,197 — 11,303 Other Pass 297 457 556 194 90 218 2,675 86 4,573 Special mention — 75 139 27 86 99 71 17 514 Substandard — 32 25 — 138 90 17 25 327 Doubtful — — — — — 27 — — 27 Loss — — — — 1 — — — 1 Total other 297 564 720 221 315 434 2,763 128 5,442 Commercial real estate Pass 452 1,111 867 731 457 869 3 4 4,494 Special mention — 58 131 45 31 49 — — 314 Substandard — — — — — 13 — — 13 Doubtful — — — — — 2 — — 2 Total commercial real estate 452 1,169 998 776 488 933 3 4 4,823 Total commercial $ 979 $ 2,096 $ 1,942 $ 1,084 $ 893 $ 1,479 $ 12,963 $ 132 $ 21,568 Origination year Revolving loans converted to term December 31, 2020 ($ in millions) 2020 2019 2018 2017 2016 2015 and prior Revolving loans Total Commercial and industrial Automotive Pass $ 869 $ 220 $ 58 $ 91 $ 76 $ 34 $ 15,433 $ — $ 16,781 Special mention 48 23 59 52 9 18 2,013 — 2,222 Substandard 3 2 — — 1 — 72 — 78 Doubtful — — — — — — 1 — 1 Total automotive 920 245 117 143 86 52 17,519 — 19,082 Other Pass 536 622 244 210 81 69 2,142 76 3,980 Special mention 76 169 123 190 102 115 123 43 941 Substandard 33 26 — 108 — 77 21 20 285 Doubtful — — — 6 — 27 2 1 36 Total other 645 817 367 514 183 288 2,288 140 5,242 Commercial real estate Pass 1,108 928 799 580 651 512 — 2 4,580 Special mention 38 132 116 32 49 43 — — 410 Substandard — — — 3 6 7 — — 16 Doubtful — — — — 2 — — — 2 Total commercial real estate 1,146 1,060 915 615 708 562 — 2 5,008 Total commercial $ 2,711 $ 2,122 $ 1,399 $ 1,272 $ 977 $ 902 $ 19,807 $ 142 $ 29,332 The following table presents an analysis of our past-due commercial finance receivables and loans recorded at amortized cost basis. ($ in millions) 30–59 days past due 60–89 days past due 90 days or more past due Total past due Current Total finance receivables and loans June 30, 2021 Commercial Commercial and industrial Automotive $ — $ — $ — $ — $ 11,303 $ 11,303 Other — — — — 5,442 5,442 Commercial real estate — — 2 2 4,821 4,823 Total commercial $ — $ — $ 2 $ 2 $ 21,566 $ 21,568 December 31, 2020 Commercial Commercial and industrial Automotive $ — $ — $ — $ — $ 19,082 $ 19,082 Other — — — — 5,242 5,242 Commercial real estate — — 2 2 5,006 5,008 Total commercial $ — $ — $ 2 $ 2 $ 29,330 $ 29,332 Troubled Debt Restructurings TDRs are loan modifications where concessions were granted to borrowers experiencing financial difficulties. For consumer automotive loans, we may offer several types of assistance to aid our customers, including payment extensions and rewrites of the loan terms. Additionally, for mortgage loans, as part of certain programs, we offer mortgage loan modifications to qualified borrowers. These programs are in place to provide support to our mortgage customers in financial distress, including principal forgiveness, maturity extensions, delinquent interest capitalization, and changes to contractual interest rates. Total TDRs recorded at amortized cost were $2.4 billion and $2.2 billion at June 30, 2021, and December 31, 2020, respectively. Our consumer automotive portfolio accounts for the majority of the year-over-year increase in TDR balances. TDRs in our consumer automotive portfolio increased as a result of the COVID-19 loan modification program offered to customers. Additionally, following the expiration of that program, we have continued to support impacted borrowers pursuant to our established risk management policies and practices. Total commitments to lend additional funds to borrowers whose terms had been modified in a TDR were $21 million and $14 million at June 30, 2021, and December 31, 2020, respectively. Refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for additional information. The following tables present information related to finance receivables and loans recorded at amortized cost modified in connection with a TDR during the period. 2021 2020 Three months ended June 30, ($ in millions) Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Consumer automotive 14,670 $ 271 $ 267 21,293 $ 323 $ 297 Consumer mortgage Mortgage Finance 10 4 5 19 11 11 Mortgage — Legacy 3 1 1 23 3 3 Total consumer mortgage 13 5 6 42 14 14 Total consumer 14,683 276 273 21,335 337 311 Commercial and industrial Automotive 1 1 1 2 31 26 Other — — — 1 23 7 Commercial real estate 1 3 3 — — — Total commercial 2 4 4 3 54 33 Total finance receivables and loans 14,685 $ 280 $ 277 21,338 $ 391 $ 344 2021 2020 Six months ended June 30, ($ in millions) Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Consumer automotive 40,260 $ 743 $ 733 44,093 $ 663 $ 615 Consumer mortgage Mortgage Finance 15 8 9 29 15 15 Mortgage — Legacy 4 1 1 55 7 7 Total consumer mortgage 19 9 10 84 22 22 Total consumer 40,279 752 743 44,177 685 637 Commercial and industrial Automotive 1 1 1 3 38 33 Other 1 33 33 1 23 7 Commercial real estate 1 3 3 — — — Total commercial 3 37 37 4 61 40 Total finance receivables and loans 40,282 $ 789 $ 780 44,181 $ 746 $ 677 The following tables present information about finance receivables and loans recorded at amortized cost that have redefaulted during the reporting period and were within 12 months or less of being modified as a TDR. Redefault is when finance receivables and loans meet the requirements for evaluation under our charge-off policy (refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for additional information) except for commercial finance receivables and loans, where redefault is defined as 90 days past due. 2021 2020 Three months ended June 30, ($ in millions) Number of loans Amortized cost Charge-off amount Number of loans Amortized cost Charge-off amount Consumer automotive 1,751 $ 22 $ 11 1,119 $ 11 $ 8 Consumer mortgage Mortgage Finance 1 — — — — — Mortgage — Legacy 2 — — — — — Total consumer finance receivables and loans 1,754 $ 22 $ 11 1,119 $ 11 $ 8 2021 2020 Six months ended June 30, ($ in millions) Number of loans Amortized cost Charge-off amount Number of loans Amortized cost Charge-off amount Consumer automotive 4,565 $ 55 $ 31 2,283 $ 24 $ 17 Consumer mortgage Mortgage Finance 1 — — — — — Mortgage — Legacy 4 — — — — — Total consumer finance receivables and loans 4,570 $ 55 $ 31 2,283 $ 24 $ 17

Leasing

Leasing	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Leasing	Leasing Ally as the Lessee We have operating leases for our corporate facilities, which have remaining lease terms of 3 months to 11 years. Most of the property leases have fixed payment terms with annual fixed-escalation clauses and include options to extend the leases for periods that range from 1 year to 15 years. Some of those lease agreements also include options to terminate the leases in periods that range from approximately 5 years to 6 years after the commencement of the leases. We have not included any of these term extensions or termination provisions in our estimates of the lease term, as we do not consider it reasonably certain that the options will be exercised. We also have operating leases for a fleet of vehicles that is used by our sales force for business purposes, with noncancelable lease terms of 367 days. Thereafter, the leases are month-to-month, up to a maximum of 48 months from inception. During the three months and six months ended June 30, 2021, we paid $16 million and $29 million, respectively, in cash for amounts included in the measurement of lease liabilities at June 30, 2021, compared to $12 million and $25 million for the three months and six months ended June 30, 2020, in cash for amounts included in the measurement of lease liabilities at June 30, 2020. These amounts are included in net cash provided by operating activities in the Condensed Consolidated Statement of Cash Flows. During the six months ended June 30, 2021, and June 30, 2020, we obtained $333 million and $43 million, respectively, of ROU assets in exchange for new lease liabilities. As of June 30, 2021, the weighted-average remaining lease term of our operating lease portfolio was 7 years, and the weighted-average discount rate was 2.15%, compared to 7 years and 2.21% as of December 31, 2020. The following table presents future minimum rental payments we are required to make under operating leases that have commenced as of June 30, 2021, and that have noncancelable lease terms expiring after June 30, 2021. ($ in millions) 2021 $ 20 2022 35 2023 27 2024 20 2025 18 2026 and thereafter 58 Total undiscounted cash flows 178 Difference between undiscounted cash flows and discounted cash flows (11) Total lease liability $ 167 In March 2021, we commenced the lease for a new corporate facility in Charlotte, North Carolina, which includes an underlying purchase option that is reasonably expected to be executed. As a result, this lease facility is presented as a financing lease at June 30, 2021. The finance lease liability of $326 million includes payments inherent in the purchase obligation. The expense associated with this lease was not material. We provided notice of our intent to exercise the purchase option in April 2021, and executed on the purchase agreement in July 2021. Additionally, we agreed to sublease a portion of this corporate facility in exchange for $13 million in future lease payments over a ten year lease term. The following table details the components of total net operating lease expense. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Operating lease expense $ 14 $ 11 $ 26 $ 24 Variable lease expense 2 2 4 4 Total lease expense, net (a) $ 16 $ 13 $ 30 $ 28 (a) Included in other operating expenses in our Condensed Consolidated Statement of Comprehensive Income. Ally as the Lessor Investment in Operating Leases We purchase consumer operating lease contracts and the associated vehicles from dealerships after those contracts are executed by the dealers and the consumers. The amount we pay a dealer for an operating lease contract is based on the negotiated price for the vehicle less vehicle trade-in, down payment from the consumer, and available automotive manufacturer incentives. Under the operating lease, the consumer is obligated to make payments in amounts equal to the amount by which the negotiated purchase price of the vehicle (less any trade-in value, down payment, or available manufacturer incentives) exceeds the contract residual value (including residual support) of the vehicle at lease termination, plus operating lease rental charges. The customer can terminate the lease at any point after commencement, subject to additional charges and fees. Both the consumer and the dealership have the option to purchase the vehicle at the end of the lease term, which can range from 24 to 60 months, at the residual value of the vehicle, however it is not reasonably certain this option will be exercised and accordingly our consumer leases are classified as operating leases. In addition to the charges described above, the consumer is generally responsible for certain charges related to excess mileage or excessive wear and tear on the vehicle. These charges are deemed variable lease payments and, as these payments are not based on a rate or index, they are recognized as net depreciation expense on operating lease assets in our Condensed Consolidated Statement of Comprehensive Income as incurred. When we acquire a consumer operating lease, we assume ownership of the vehicle from the dealer. We require that property damage, bodily injury, collision, and comprehensive insurance be obtained by the lessee on all consumer operating leases. Neither the consumer nor the dealer is responsible for the value of the vehicle at the time of lease termination. When vehicles are not purchased by customers or the receiving dealer at scheduled lease termination, the vehicle is returned to us for remarketing. We generally bear the risk of loss to the extent the value of a leased vehicle upon remarketing is below the expected residual value. At termination, our actual sales proceeds from remarketing the vehicle may be higher or lower than the estimated residual value resulting in a gain or loss on remarketing, which is included in net depreciation expense on operating lease assets in our Condensed Consolidated Statement of Comprehensive Income. Excessive mileage or excessive wear and tear on the vehicle during the lease may impact the sales proceeds received upon remarketing. As of June 30, 2021, and December 31, 2020, consumer operating leases with a carrying value, net of accumulated depreciation, of $264 million and $352 million, respectively, were covered by a residual value guarantee of 15% of the manufacturer’s suggested retail price. The following table details our investment in operating leases. ($ in millions) June 30, 2021 December 31, 2020 Vehicles $ 12,170 $ 11,182 Accumulated depreciation (1,455) (1,543) Investment in operating leases, net $ 10,715 $ 9,639 The following table presents future minimum rental payments we have the right to receive under operating leases with noncancelable lease terms expiring after June 30, 2021. ($ in millions) 2021 $ 818 2022 1,326 2023 877 2024 274 2025 36 2026 and thereafter 2 Total lease payments from operating leases $ 3,333 We recognized operating lease revenue of $384 million and $754 million for the three months and six months ended June 30, 2021, respectively, and $343 million and $710 million for the three months and six months ended June 30, 2020. Depreciation expense on operating lease assets includes net remarketing gains and losses recognized on the sale of operating lease assets. The following table summarizes the components of depreciation expense on operating lease assets. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Depreciation expense on operating lease assets (excluding remarketing gains and losses) (a) $ 210 $ 241 $ 437 $ 491 Remarketing (gains) losses, net (128) 11 (192) 9 Net depreciation expense on operating lease assets $ 82 $ 252 $ 245 $ 500 (a) Includes variable lease payments related to excess mileage and excessive wear and tear on vehicles of $5 million and $10 million during the three months and six months ended June 30, 2021, respectively, and $5 million and $12 million during the three months and six months ended June 30, 2020. Finance Leases In our Automotive Finance operations, we also hold automotive leases that require finance lease treatment as prescribed by ASC Topic 842, Leases . Our total gross investment in finance leases, which is included in finance receivables and loans, net, on our Condensed Consolidated Balance Sheet was $496 million and $450 million as of June 30, 2021, and December 31, 2020, respectively. This includes lease payment receivables of $483 million and $437 million at June 30, 2021, and December 31, 2020, respectively, and unguaranteed residual assets of $13 million at both June 30, 2021, and December 31, 2020. Interest income on finance lease receivables was $7 million and $13 million for the three months and six months ended June 30, 2021, respectively, and $5 million and $11 million for the three months and six months ended June 30, 2020, and is included in interest and fees on finance receivables and loans in our Condensed Consolidated Statement of Comprehensive Income. The following table presents future minimum rental payments we have the right to receive under finance leases with noncancelable lease terms expiring after June 30, 2021. ($ in millions) 2021 $ 90 2022 152 2023 124 2024 97 2025 44 2026 and thereafter 29 Total undiscounted cash flows 536 Difference between undiscounted cash flows and discounted cash flows (53) Present value of lease payments recorded as lease receivable $ 483
Leasing	Leasing Ally as the Lessee We have operating leases for our corporate facilities, which have remaining lease terms of 3 months to 11 years. Most of the property leases have fixed payment terms with annual fixed-escalation clauses and include options to extend the leases for periods that range from 1 year to 15 years. Some of those lease agreements also include options to terminate the leases in periods that range from approximately 5 years to 6 years after the commencement of the leases. We have not included any of these term extensions or termination provisions in our estimates of the lease term, as we do not consider it reasonably certain that the options will be exercised. We also have operating leases for a fleet of vehicles that is used by our sales force for business purposes, with noncancelable lease terms of 367 days. Thereafter, the leases are month-to-month, up to a maximum of 48 months from inception. During the three months and six months ended June 30, 2021, we paid $16 million and $29 million, respectively, in cash for amounts included in the measurement of lease liabilities at June 30, 2021, compared to $12 million and $25 million for the three months and six months ended June 30, 2020, in cash for amounts included in the measurement of lease liabilities at June 30, 2020. These amounts are included in net cash provided by operating activities in the Condensed Consolidated Statement of Cash Flows. During the six months ended June 30, 2021, and June 30, 2020, we obtained $333 million and $43 million, respectively, of ROU assets in exchange for new lease liabilities. As of June 30, 2021, the weighted-average remaining lease term of our operating lease portfolio was 7 years, and the weighted-average discount rate was 2.15%, compared to 7 years and 2.21% as of December 31, 2020. The following table presents future minimum rental payments we are required to make under operating leases that have commenced as of June 30, 2021, and that have noncancelable lease terms expiring after June 30, 2021. ($ in millions) 2021 $ 20 2022 35 2023 27 2024 20 2025 18 2026 and thereafter 58 Total undiscounted cash flows 178 Difference between undiscounted cash flows and discounted cash flows (11) Total lease liability $ 167 In March 2021, we commenced the lease for a new corporate facility in Charlotte, North Carolina, which includes an underlying purchase option that is reasonably expected to be executed. As a result, this lease facility is presented as a financing lease at June 30, 2021. The finance lease liability of $326 million includes payments inherent in the purchase obligation. The expense associated with this lease was not material. We provided notice of our intent to exercise the purchase option in April 2021, and executed on the purchase agreement in July 2021. Additionally, we agreed to sublease a portion of this corporate facility in exchange for $13 million in future lease payments over a ten year lease term. The following table details the components of total net operating lease expense. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Operating lease expense $ 14 $ 11 $ 26 $ 24 Variable lease expense 2 2 4 4 Total lease expense, net (a) $ 16 $ 13 $ 30 $ 28 (a) Included in other operating expenses in our Condensed Consolidated Statement of Comprehensive Income. Ally as the Lessor Investment in Operating Leases We purchase consumer operating lease contracts and the associated vehicles from dealerships after those contracts are executed by the dealers and the consumers. The amount we pay a dealer for an operating lease contract is based on the negotiated price for the vehicle less vehicle trade-in, down payment from the consumer, and available automotive manufacturer incentives. Under the operating lease, the consumer is obligated to make payments in amounts equal to the amount by which the negotiated purchase price of the vehicle (less any trade-in value, down payment, or available manufacturer incentives) exceeds the contract residual value (including residual support) of the vehicle at lease termination, plus operating lease rental charges. The customer can terminate the lease at any point after commencement, subject to additional charges and fees. Both the consumer and the dealership have the option to purchase the vehicle at the end of the lease term, which can range from 24 to 60 months, at the residual value of the vehicle, however it is not reasonably certain this option will be exercised and accordingly our consumer leases are classified as operating leases. In addition to the charges described above, the consumer is generally responsible for certain charges related to excess mileage or excessive wear and tear on the vehicle. These charges are deemed variable lease payments and, as these payments are not based on a rate or index, they are recognized as net depreciation expense on operating lease assets in our Condensed Consolidated Statement of Comprehensive Income as incurred. When we acquire a consumer operating lease, we assume ownership of the vehicle from the dealer. We require that property damage, bodily injury, collision, and comprehensive insurance be obtained by the lessee on all consumer operating leases. Neither the consumer nor the dealer is responsible for the value of the vehicle at the time of lease termination. When vehicles are not purchased by customers or the receiving dealer at scheduled lease termination, the vehicle is returned to us for remarketing. We generally bear the risk of loss to the extent the value of a leased vehicle upon remarketing is below the expected residual value. At termination, our actual sales proceeds from remarketing the vehicle may be higher or lower than the estimated residual value resulting in a gain or loss on remarketing, which is included in net depreciation expense on operating lease assets in our Condensed Consolidated Statement of Comprehensive Income. Excessive mileage or excessive wear and tear on the vehicle during the lease may impact the sales proceeds received upon remarketing. As of June 30, 2021, and December 31, 2020, consumer operating leases with a carrying value, net of accumulated depreciation, of $264 million and $352 million, respectively, were covered by a residual value guarantee of 15% of the manufacturer’s suggested retail price. The following table details our investment in operating leases. ($ in millions) June 30, 2021 December 31, 2020 Vehicles $ 12,170 $ 11,182 Accumulated depreciation (1,455) (1,543) Investment in operating leases, net $ 10,715 $ 9,639 The following table presents future minimum rental payments we have the right to receive under operating leases with noncancelable lease terms expiring after June 30, 2021. ($ in millions) 2021 $ 818 2022 1,326 2023 877 2024 274 2025 36 2026 and thereafter 2 Total lease payments from operating leases $ 3,333 We recognized operating lease revenue of $384 million and $754 million for the three months and six months ended June 30, 2021, respectively, and $343 million and $710 million for the three months and six months ended June 30, 2020. Depreciation expense on operating lease assets includes net remarketing gains and losses recognized on the sale of operating lease assets. The following table summarizes the components of depreciation expense on operating lease assets. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Depreciation expense on operating lease assets (excluding remarketing gains and losses) (a) $ 210 $ 241 $ 437 $ 491 Remarketing (gains) losses, net (128) 11 (192) 9 Net depreciation expense on operating lease assets $ 82 $ 252 $ 245 $ 500 (a) Includes variable lease payments related to excess mileage and excessive wear and tear on vehicles of $5 million and $10 million during the three months and six months ended June 30, 2021, respectively, and $5 million and $12 million during the three months and six months ended June 30, 2020. Finance Leases In our Automotive Finance operations, we also hold automotive leases that require finance lease treatment as prescribed by ASC Topic 842, Leases . Our total gross investment in finance leases, which is included in finance receivables and loans, net, on our Condensed Consolidated Balance Sheet was $496 million and $450 million as of June 30, 2021, and December 31, 2020, respectively. This includes lease payment receivables of $483 million and $437 million at June 30, 2021, and December 31, 2020, respectively, and unguaranteed residual assets of $13 million at both June 30, 2021, and December 31, 2020. Interest income on finance lease receivables was $7 million and $13 million for the three months and six months ended June 30, 2021, respectively, and $5 million and $11 million for the three months and six months ended June 30, 2020, and is included in interest and fees on finance receivables and loans in our Condensed Consolidated Statement of Comprehensive Income. The following table presents future minimum rental payments we have the right to receive under finance leases with noncancelable lease terms expiring after June 30, 2021. ($ in millions) 2021 $ 90 2022 152 2023 124 2024 97 2025 44 2026 and thereafter 29 Total undiscounted cash flows 536 Difference between undiscounted cash flows and discounted cash flows (53) Present value of lease payments recorded as lease receivable $ 483
Leasing	Leasing Ally as the Lessee We have operating leases for our corporate facilities, which have remaining lease terms of 3 months to 11 years. Most of the property leases have fixed payment terms with annual fixed-escalation clauses and include options to extend the leases for periods that range from 1 year to 15 years. Some of those lease agreements also include options to terminate the leases in periods that range from approximately 5 years to 6 years after the commencement of the leases. We have not included any of these term extensions or termination provisions in our estimates of the lease term, as we do not consider it reasonably certain that the options will be exercised. We also have operating leases for a fleet of vehicles that is used by our sales force for business purposes, with noncancelable lease terms of 367 days. Thereafter, the leases are month-to-month, up to a maximum of 48 months from inception. During the three months and six months ended June 30, 2021, we paid $16 million and $29 million, respectively, in cash for amounts included in the measurement of lease liabilities at June 30, 2021, compared to $12 million and $25 million for the three months and six months ended June 30, 2020, in cash for amounts included in the measurement of lease liabilities at June 30, 2020. These amounts are included in net cash provided by operating activities in the Condensed Consolidated Statement of Cash Flows. During the six months ended June 30, 2021, and June 30, 2020, we obtained $333 million and $43 million, respectively, of ROU assets in exchange for new lease liabilities. As of June 30, 2021, the weighted-average remaining lease term of our operating lease portfolio was 7 years, and the weighted-average discount rate was 2.15%, compared to 7 years and 2.21% as of December 31, 2020. The following table presents future minimum rental payments we are required to make under operating leases that have commenced as of June 30, 2021, and that have noncancelable lease terms expiring after June 30, 2021. ($ in millions) 2021 $ 20 2022 35 2023 27 2024 20 2025 18 2026 and thereafter 58 Total undiscounted cash flows 178 Difference between undiscounted cash flows and discounted cash flows (11) Total lease liability $ 167 In March 2021, we commenced the lease for a new corporate facility in Charlotte, North Carolina, which includes an underlying purchase option that is reasonably expected to be executed. As a result, this lease facility is presented as a financing lease at June 30, 2021. The finance lease liability of $326 million includes payments inherent in the purchase obligation. The expense associated with this lease was not material. We provided notice of our intent to exercise the purchase option in April 2021, and executed on the purchase agreement in July 2021. Additionally, we agreed to sublease a portion of this corporate facility in exchange for $13 million in future lease payments over a ten year lease term. The following table details the components of total net operating lease expense. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Operating lease expense $ 14 $ 11 $ 26 $ 24 Variable lease expense 2 2 4 4 Total lease expense, net (a) $ 16 $ 13 $ 30 $ 28 (a) Included in other operating expenses in our Condensed Consolidated Statement of Comprehensive Income. Ally as the Lessor Investment in Operating Leases We purchase consumer operating lease contracts and the associated vehicles from dealerships after those contracts are executed by the dealers and the consumers. The amount we pay a dealer for an operating lease contract is based on the negotiated price for the vehicle less vehicle trade-in, down payment from the consumer, and available automotive manufacturer incentives. Under the operating lease, the consumer is obligated to make payments in amounts equal to the amount by which the negotiated purchase price of the vehicle (less any trade-in value, down payment, or available manufacturer incentives) exceeds the contract residual value (including residual support) of the vehicle at lease termination, plus operating lease rental charges. The customer can terminate the lease at any point after commencement, subject to additional charges and fees. Both the consumer and the dealership have the option to purchase the vehicle at the end of the lease term, which can range from 24 to 60 months, at the residual value of the vehicle, however it is not reasonably certain this option will be exercised and accordingly our consumer leases are classified as operating leases. In addition to the charges described above, the consumer is generally responsible for certain charges related to excess mileage or excessive wear and tear on the vehicle. These charges are deemed variable lease payments and, as these payments are not based on a rate or index, they are recognized as net depreciation expense on operating lease assets in our Condensed Consolidated Statement of Comprehensive Income as incurred. When we acquire a consumer operating lease, we assume ownership of the vehicle from the dealer. We require that property damage, bodily injury, collision, and comprehensive insurance be obtained by the lessee on all consumer operating leases. Neither the consumer nor the dealer is responsible for the value of the vehicle at the time of lease termination. When vehicles are not purchased by customers or the receiving dealer at scheduled lease termination, the vehicle is returned to us for remarketing. We generally bear the risk of loss to the extent the value of a leased vehicle upon remarketing is below the expected residual value. At termination, our actual sales proceeds from remarketing the vehicle may be higher or lower than the estimated residual value resulting in a gain or loss on remarketing, which is included in net depreciation expense on operating lease assets in our Condensed Consolidated Statement of Comprehensive Income. Excessive mileage or excessive wear and tear on the vehicle during the lease may impact the sales proceeds received upon remarketing. As of June 30, 2021, and December 31, 2020, consumer operating leases with a carrying value, net of accumulated depreciation, of $264 million and $352 million, respectively, were covered by a residual value guarantee of 15% of the manufacturer’s suggested retail price. The following table details our investment in operating leases. ($ in millions) June 30, 2021 December 31, 2020 Vehicles $ 12,170 $ 11,182 Accumulated depreciation (1,455) (1,543) Investment in operating leases, net $ 10,715 $ 9,639 The following table presents future minimum rental payments we have the right to receive under operating leases with noncancelable lease terms expiring after June 30, 2021. ($ in millions) 2021 $ 818 2022 1,326 2023 877 2024 274 2025 36 2026 and thereafter 2 Total lease payments from operating leases $ 3,333 We recognized operating lease revenue of $384 million and $754 million for the three months and six months ended June 30, 2021, respectively, and $343 million and $710 million for the three months and six months ended June 30, 2020. Depreciation expense on operating lease assets includes net remarketing gains and losses recognized on the sale of operating lease assets. The following table summarizes the components of depreciation expense on operating lease assets. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Depreciation expense on operating lease assets (excluding remarketing gains and losses) (a) $ 210 $ 241 $ 437 $ 491 Remarketing (gains) losses, net (128) 11 (192) 9 Net depreciation expense on operating lease assets $ 82 $ 252 $ 245 $ 500 (a) Includes variable lease payments related to excess mileage and excessive wear and tear on vehicles of $5 million and $10 million during the three months and six months ended June 30, 2021, respectively, and $5 million and $12 million during the three months and six months ended June 30, 2020. Finance Leases In our Automotive Finance operations, we also hold automotive leases that require finance lease treatment as prescribed by ASC Topic 842, Leases . Our total gross investment in finance leases, which is included in finance receivables and loans, net, on our Condensed Consolidated Balance Sheet was $496 million and $450 million as of June 30, 2021, and December 31, 2020, respectively. This includes lease payment receivables of $483 million and $437 million at June 30, 2021, and December 31, 2020, respectively, and unguaranteed residual assets of $13 million at both June 30, 2021, and December 31, 2020. Interest income on finance lease receivables was $7 million and $13 million for the three months and six months ended June 30, 2021, respectively, and $5 million and $11 million for the three months and six months ended June 30, 2020, and is included in interest and fees on finance receivables and loans in our Condensed Consolidated Statement of Comprehensive Income. The following table presents future minimum rental payments we have the right to receive under finance leases with noncancelable lease terms expiring after June 30, 2021. ($ in millions) 2021 $ 90 2022 152 2023 124 2024 97 2025 44 2026 and thereafter 29 Total undiscounted cash flows 536 Difference between undiscounted cash flows and discounted cash flows (53) Present value of lease payments recorded as lease receivable $ 483

Securitizations and Variable In

Securitizations and Variable Interest Entities	6 Months Ended
	Jun. 30, 2021
Securitizations And Variable Interest Entities [Abstract]
Securitizations and Variable Interest Entities	Securitizations and Variable Interest Entities We securitize, transfer, and service consumer and commercial automotive loans. We often securitize these loans (also referred to as financial assets) using SPEs. An SPE is a legal entity that is designed to fulfill a specified limited need of the sponsor. Our principal use of SPEs is to obtain liquidity by securitizing certain of our financial assets. SPEs are often VIEs and may or may not be included on our Condensed Consolidated Balance Sheet. VIEs are legal entities that either have an insufficient amount of equity at risk for the entity to finance its activities without additional subordinated financial support or, as a group, the holders of the equity investment at risk lack the ability to control the entity’s activities that most significantly impact economic performance through voting or similar rights, or do not have the obligation to absorb the expected losses or the right to receive expected residual returns of the entity. The VIEs included on the Condensed Consolidated Balance Sheet represent SPEs where we are deemed to be the primary beneficiary, primarily due to our servicing activities and our beneficial interests in the VIE that could be potentially significant. The nature, purpose, and activities of nonconsolidated SPEs are similar to those of our consolidated SPEs with the primary difference being the nature and extent of our continuing involvement. For nonconsolidated SPEs, the transferred financial assets are removed from our balance sheet provided the conditions for sale accounting are met. The financial assets obtained from the securitization are primarily reported as cash or retained interests (if applicable). Liabilities incurred as part of these securitizations, are recorded at fair value at the time of sale and are reported as accrued expenses and other liabilities on our Condensed Consolidated Balance Sheet. Upon the sale of the loans, we recognize a gain or loss on sale for the difference between the assets recognized, the assets derecognized, and the liabilities recognized as part of the transaction. With respect to our ongoing right to service the assets we sell, the servicing fee we receive represents adequate compensation, and consequently, we do not recognize a servicing asset or liability. There were no sales of financial assets into nonconsolidated VIEs for both the three months and six months ended June 30, 2021, and June 30, 2020. We provide long-term guarantee contracts to investors in certain nonconsolidated affordable housing entities and have extended a line of credit to provide liquidity. Since we do not have control over the entities or the power to make decisions, we do not consolidate the entities and our involvement is limited to the guarantee and the line of credit. We are involved with various other nonconsolidated equity investments, including affordable housing entities and venture capital funds and loan funds. We do not consolidate these entities and our involvement is limited to our outstanding investment, additional capital committed to these funds plus any previously recognized low-income housing tax credits that are subject to recapture. Refer to Note 1 and Note 11 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for further description of our securitization activities and our involvement with VIEs. The following table presents our involvement in consolidated and nonconsolidated VIEs in which we hold variable interests. For additional detail related to the assets and liabilities of consolidated variable interest entities refer to the Condensed Consolidated Balance Sheet. ($ in millions) Carrying value of total assets Carrying value of total liabilities Assets sold to nonconsolidated VIEs (a) Maximum exposure to loss in nonconsolidated VIEs June 30, 2021 On-balance sheet variable interest entities Consumer automotive $ 18,448 (b) $ 1,964 (c) Commercial automotive 2,306 1 Off-balance sheet variable interest entities Commercial other 1,563 (d) 666 (e) — 2,040 (f) Total $ 22,317 $ 2,631 $ — $ 2,040 December 31, 2020 On-balance sheet variable interest entities Consumer automotive $ 17,833 (b) $ 3,103 (c) Commercial automotive 6,276 1,152 Off-balance sheet variable interest entities Commercial other 1,295 (d) 529 (e) — 1,754 (f) Total $ 25,404 $ 4,784 $ — $ 1,754 (a) Asset values represent the current unpaid principal balance of outstanding consumer finance receivables and loans within the VIEs. (b) Includes $10.9 billion and $9.9 billion of assets that were not encumbered by VIE beneficial interests held by third parties at June 30, 2021, and December 31, 2020, respectively. Ally or consolidated affiliates hold the interests in these assets. (c) Includes $114 million and $94 million of liabilities that were not obligations to third-party beneficial interest holders at June 30, 2021, and December 31, 2020, respectively. (d) Amounts are classified as other assets. (e) Amounts are classified as accrued expenses and other liabilities. (f) For certain nonconsolidated affordable housing entities, maximum exposure to loss represents the yield we guaranteed investors through long-term guarantee contracts. The amount disclosed is based on the unlikely event that the yield delivered to investors in the form of low-income tax housing credits is recaptured. For nonconsolidated equity investments, maximum exposure to loss represents our outstanding investment, additional committed capital, and low-income housing tax credits subject to recapture. The amount disclosed is based on the unlikely event that our committed capital is funded, our investments become worthless, and the tax credits previously delivered to us are recaptured. This required disclosure is not an indication of our expected loss. Cash Flows with Off-Balance Sheet Securitization Entities The following table summarizes cash flows received and paid related to SPEs and asset-backed financings where the transfer is accounted for as a sale and we have a continuing involvement with the transferred consumer automotive assets (for example, servicing) that were outstanding during the six months ended June 30, 2021, and 2020. Additionally, this table contains information regarding cash flows received from and paid to nonconsolidated SPEs that existed during each period. Six months ended June 30, ($ in millions) 2021 2020 Consumer automotive Cash flows received on retained interests in securitization entities $ — $ 8 Servicing fees — 2 Cash disbursements for repurchases during the period — (2) Total $ — $ 8 Delinquencies and Net Credit Losses We did not have any off-balance sheet securitizations or whole-loan sales where we had continuing involvement at June 30, 2021, or December 31, 2020. During the six months ended June 30, 2020, we recognized $1 million of net credit losses from off-balance sheet securitizations where we have continuing involvement.

Other Assets

Other Assets	6 Months Ended
	Jun. 30, 2021
Other Assets [Abstract]
Other Assets	Other Assets The components of other assets were as follows. ($ in millions) June 30, 2021 December 31, 2020 Property and equipment at cost $ 1,668 $ 1,541 Accumulated depreciation (877) (815) Net property and equipment 791 726 Investment in qualified affordable housing projects 1,261 1,095 Nonmarketable equity investments (a) (b) 939 915 Net deferred tax assets 889 94 Restricted cash held for securitization trusts (c) 702 875 Accrued interest, fees, and rent receivables 572 704 Equity-method investments (d) 382 320 Goodwill 343 343 Finance lease right-of-use assets (e) 327 — Operating lease right-of-use assets 142 162 Other accounts receivable 128 166 Restricted cash and cash equivalents (f) 79 78 Net intangible assets (g) 41 50 Fair value of derivative contracts in receivable position (h) 16 17 Other assets 893 870 Total other assets $ 7,505 $ 6,415 (a) Includes investments in FHLB stock of $239 million and $276 million at June 30, 2021, and December 31, 2020, respectively; FRB stock of $449 million at both June 30, 2021, and December 31, 2020; and equity securities without a readily determinable fair value of $251 million and $189 million at June 30, 2021, and December 31, 2020, respectively, measured at cost with adjustments for impairment and observable changes in price. (b) During both the three months and six months ended June 30, 2021, we recorded $81 million of upward adjustments related to equity securities without a readily determinable fair value still held at June 30, 2021, driven primarily by an investment in one entity for which there was a subsequent funding round at a higher valuation during the period, resulting in an observable price change. During both the three months and six months ended June 30, 2021, we recorded $1 million of impairments and downward adjustments related to equity securities without a readily determinable fair value still held at June 30, 2021. Securities held in our portfolio of equity securities without a readily determinable fair value as of June 30, 2021, include cumulative upward adjustments of $176 million and impairments and downward adjustments of $13 million through June 30, 2021. (c) Includes restricted cash collected from customer payments on securitized receivables, which are distributed by us to investors as payments on the related secured debt, and cash reserve deposits utilized as a form of credit enhancement for various securitization transactions. (d) Primarily relates to investments made in connection with our CRA program. (e) For additional information on finance lease right-of-use assets, refer to Note 8. (f) Primarily represents a number of arrangements with third parties where certain restrictions are placed on balances we hold due to collateral agreements associated with operational processes with a third-party bank, or letter of credit arrangements and corresponding collateral requirements. (g) Includes gross intangible assets of $109 million at both June 30, 2021, and December 31, 2020, and accumulated amortization of $68 million and $59 million at June 30, 2021, and December 31, 2020, respectively. (h) For additional information on derivative instruments and hedging activities, refer to Note 18. The carrying balance of goodwill by reportable operating segment was as follows. ($ in millions) Automotive Finance operations Insurance operations Corporate and Other (a) Total Goodwill at December 31, 2020 $ 20 $ 27 $ 296 $ 343 Impairment losses — — — — Goodwill at June 30, 2021 $ 20 $ 27 $ 296 $ 343 (a) Includes $153 million of goodwill associated with Ally Lending at both June 30, 2021, and December 31, 2020, and $143 million of goodwill associated with Ally Invest at both June 30, 2021, and December 31, 2020.

Deposit Liabilities

Deposit Liabilities	6 Months Ended
	Jun. 30, 2021
Deposits [Abstract]
Deposit Liabilities	Deposit Liabilities Deposit liabilities consisted of the following. ($ in millions) June 30, 2021 December 31, 2020 Noninterest-bearing deposits $ 149 $ 128 Interest-bearing deposits Savings, money market, and checking accounts 93,702 83,698 Certificates of deposit 45,253 53,210 Total deposit liabilities $ 139,104 $ 137,036 At June 30, 2021, and December 31, 2020, certificates of deposit included $22.8 billion and $25.8 billion, respectively, of those in denominations of $100 thousand or more. At June 30, 2021, and December 31, 2020, certificates of deposit included $7.7 billion and $8.6 billion, respectively, of those in denominations in excess of $250 thousand federal insurance limits.

Debt

Debt	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Debt	Debt Short-Term Borrowings The following table presents the composition of our short-term borrowings portfolio. June 30, 2021 December 31, 2020 ($ in millions) Unsecured Secured (a) Total Unsecured Secured (a) Total Demand notes (b) $ — $ — $ — $ 2,136 $ — $ 2,136 Total short-term borrowings $ — $ — $ — $ 2,136 $ — $ 2,136 (a) Refer to the section below titled Long-Term Debt for further details on assets restricted as collateral for payment of the related debt. (b) On March 1, 2021, we terminated the offering of our demand notes program, and redeemed in full all outstanding demand notes. Long-Term Debt The following table presents the composition of our long-term debt portfolio. June 30, 2021 December 31, 2020 ($ in millions) Unsecured Secured Total Unsecured Secured Total Long-term debt (a) Due within one year $ 966 $ 6,181 $ 7,147 $ 647 $ 4,438 $ 5,085 Due after one year 8,924 825 9,749 11,367 5,554 16,921 Total long-term debt (b) (c) $ 9,890 $ 7,006 $ 16,896 $ 12,014 $ 9,992 $ 22,006 (a) Includes basis adjustments related to the application of hedge accounting. Refer to Note 18 for additional information. (b) Includes $1.2 billion and $2.6 billion of trust preferred securities at June 30, 2021, and December 31, 2020, respectively. (c) Includes advances, net of hedge basis adjustments, from the FHLB of Pittsburgh of $5.0 billion and $5.8 billion at June 30, 2021, and December 31, 2020, respectively. The following table presents the scheduled remaining maturity of long-term debt at June 30, 2021, assuming no early redemptions will occur. The amounts below include adjustments to the carrying value resulting from the application of hedge accounting. The actual payment of secured debt may vary based on the payment activity of the related pledged assets. ($ in millions) 2021 2022 2023 2024 2025 2026 and thereafter Total Unsecured Long-term debt $ 1,074 $ 1,103 $ 2,108 $ 1,473 $ 2,360 $ 2,755 $ 10,873 Original issue discount (66) (51) (57) (64) (69) (676) (983) Total unsecured 1,008 1,052 2,051 1,409 2,291 2,079 9,890 Secured Long-term debt 1,459 4,867 617 41 12 10 7,006 Total long-term debt $ 2,467 $ 5,919 $ 2,668 $ 1,450 $ 2,303 $ 2,089 $ 16,896 The following summarizes assets restricted as collateral for the payment of the related debt obligation, primarily arising from securitization transactions accounted for as secured borrowings. June 30, 2021 December 31, 2020 ($ in millions) Total (a) Ally Bank Total (a) Ally Bank Consumer mortgage finance receivables $ 13,968 $ 13,968 $ 14,979 $ 14,979 Consumer automotive finance receivables 9,660 9,244 9,953 9,510 Commercial finance receivables 2,147 2,147 10,866 10,866 Total assets restricted as collateral (b) (c) $ 25,775 $ 25,359 $ 35,798 $ 35,355 Secured debt $ 7,006 $ 6,700 $ 9,992 $ 9,634 (a) Ally Bank is a component of the total column. (b) Ally Bank has an advance agreement with the FHLB, and had assets pledged to secure borrowings that were restricted as collateral to the FHLB totaling $14.0 billion and $20.0 billion at June 30, 2021, and December 31, 2020, respectively. These assets were composed primarily of consumer mortgage finance receivables and loans and investment securities. Ally Bank has access to the FRB Discount Window and had assets pledged and restricted as collateral to the FRB totaling $2.4 billion at both June 30, 2021, and December 31, 2020. These assets were composed of consumer automotive finance receivables and loans. Availability under these programs is only for the operations of Ally Bank and cannot be used to fund the operations or liabilities of Ally or its other subsidiaries. (c) Excludes restricted cash and cash reserves for securitization trusts recorded within other assets on the Condensed Consolidated Balance Sheet. Refer to Note 10 for additional information. Trust Preferred Securities We had approximately $1.2 billion and $2.6 billion in aggregate liquidation preference of Series 2 TRUPS outstanding at June 30, 2021, and December 31, 2020, respectively. Each Series 2 TRUPS security has a liquidation amount of $25. Distributions are cumulative and are payable until redemption at the applicable coupon rate. Distributions are payable at an annual rate equal to three-month LIBOR plus 5.785% payable quarterly in arrears. Ally has the right to defer payments of interest for a period not exceeding 20 consecutive quarters. The Series 2 TRUPS have no stated maturity date, but must be redeemed upon the redemption or maturity of the related debentures (Debentures), which mature on February 15, 2040. Ally at any time may redeem, in part or in whole, the Series 2 TRUPS at a redemption price equal to 100% of the principal amount being redeemed, plus accrued and unpaid interest through the date of redemption. The Series 2 TRUPS are generally nonvoting, other than with respect to certain limited matters. During any period in which any Series 2 TRUPS remain outstanding but in which distributions on the Series 2 TRUPS have not been fully paid, none of Ally or its subsidiaries will be permitted to (i) declare or pay dividends on, make any distributions with respect to, or redeem, purchase, acquire or otherwise make a liquidation payment with respect to, any of Ally’s capital stock or make any guarantee payment with respect thereto; or (ii) make any payments of principal, interest, or premium on, or repay, repurchase or redeem, any debt securities or guarantees that rank on a parity with or junior in interest to the Debentures with certain specified exceptions in each case. The Series 2 TRUPS were issued prior to October 4, 2010, under the Emergency Economic Stabilization Act of 2008 and are not subject to phase-out from additional Tier 1 capital into Tier 2 capital. On April 22, 2021, we issued $1.35 billion of preferred stock, Series B, and used the proceeds to redeem $1.4 billion, or 56,000,000 shares of the Series 2 TRUPS outstanding. The redemption was effectuated on May 24, 2021. Additionally, on June 2, 2021, we issued $1.0 billion of preferred stock, Series C, and announced our intent to use the proceeds to redeem a portion of the Series 2 TRUPS outstanding. On July 2, 2021, we effectuated the redemption of an additional $1.04 billion, or 41,600,000 shares of the Series 2 TRUPS outstanding. The amount of Series 2 TRUPS included in Ally’s Tier 1 capital was $181 million at June 30, 2021. The amount represents the carrying amount of the Series 2 TRUPS, net of the carrying amount of Series 2 TRUPS for which we issued a notice of redemption on June 2, 2021, less our common stock investment in the trust. Funding Facilities We utilize both committed secured credit facilities and other collateralized funding vehicles. The debt outstanding under our various funding facilities is included on our Condensed Consolidated Balance Sheet. The total capacity in our credit facilities is provided by banks through private transactions. The facilities can be revolving in nature, generally having an original tenor ranging from 364 days to two years, and allow for additional funding during the commitment period, or they can be amortizing and not allow for any further funding after the commitment period. At June 30, 2021, all of our $300 million of capacity was revolving and of this balance, $125 million was from facilities with a remaining tenor greater than 364 days. Committed Secured Credit Facilities Outstanding Unused capacity (a) Total capacity ($ in millions) June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 Parent funding Secured $ 132 $ — $ 168 $ 560 $ 300 $ 560 Total committed secured credit facilities $ 132 $ — $ 168 $ 560 $ 300 $ 560 (a) Funding from committed secured credit facilities is available on request in the event excess collateral resides in certain facilities or the extent incremental collateral is available and contributed to the facilities.

Accrued Expenses and Other Liab

Accrued Expenses and Other Liabilities	6 Months Ended
	Jun. 30, 2021
Accounts Payable and Accrued Liabilities [Abstract]
Accrued Expenses and Other Liabilities	Accrued Expenses and Other Liabilities The components of accrued expenses and other liabilities were as follows. ($ in millions) June 30, 2021 December 31, 2020 Accounts payable $ 663 $ 602 Unfunded commitments for investment in qualified affordable housing projects 662 525 Employee compensation and benefits 348 316 Finance lease liabilities 326 — Operating lease liabilities 167 187 Deferred revenue 146 104 Reserves for insurance losses and loss adjustment expenses 126 129 Fair value of derivative contracts in payable position (a) 47 33 Net deferred tax liabilities 17 92 Cash collateral received from counterparties 4 6 Other liabilities 533 440 Total accrued expenses and other liabilities $ 3,039 $ 2,434 (a) For additional information on derivative instruments and hedging activities, refer to Note 18.

Preferred Stock

Preferred Stock	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Preferred Stock	Preferred Stock Series B Preferred Stock In April 2021, we issued 1,350,000 shares of 4.700% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B, with $0.01 par value and liquidation preference of $1,000 per share. Proceeds from the offering were used to redeem a portion of our 8.125% Fixed Rate/Floating Rate Trust Preferred Securities, Series 2 of GMAC Capital Trust I. Dividends on shares of the Series B Preferred Stock are discretionary and are not cumulative. Holders of the Series B Preferred Stock will be entitled to receive, if, when and as declared by our Board, or a duly authorized committee of the Board, out of legally available assets, non-cumulative cash dividends quarterly in arrears on February 15, May 15, August 15 and November 15 of each year, beginning on August 15, 2021. Dividends will accrue (i) from the date of original issue to, but excluding, May 15, 2026, at a fixed rate of 4.700% per annum and (ii) from, and including, May 15, 2026, during each five-year reset period, at a rate per annum equal to the five-year treasury rate as of the most recent reset dividend determination date plus 3.868% on the liquidation preference amount of $1,000 per share. So long as any share of Series B Preferred Stock remains outstanding, unless the dividends for the most recently completed dividend period have been paid in full, or set aside for payment, on all outstanding shares of Series B Preferred Stock, we will be prohibited, subject to certain specified exceptions, from (i) declaring or paying any dividends or making any distributions with respect to any stock that ranks on a parity basis with, or junior in interest to, the Series B Preferred Stock or (ii) repurchasing, redeeming, or otherwise acquiring for consideration, directly or indirectly, any stock that ranks on a parity basis with, or junior in interest to, the Series B Preferred Stock. The holders of the Series B Preferred Stock do not have voting rights other than those set forth in the certificate of designations for the Series B Preferred Stock included in Ally’s Certificate of Incorporation. The Series B Preferred Stock does not have a stated maturity date, and will be perpetual unless redeemed at Ally’s option. Ally is not required to redeem the Series B Preferred Stock and holders of the Series B Preferred Stock have no right to require Ally to redeem their shares. Ally may, at its option, redeem the shares of Series B Preferred stock (i) in whole or in part, on any dividend payment date on or after May 15, 2026, or (ii) in whole, but not in part, at any time within 90 days following a regulatory capital treatment event. In the event of any liquidation, dissolution or winding up of the affairs of Ally, holders of the Series B Preferred Stock will be entitled to receive the liquidation amount per share of Series B Preferred Stock and an amount equal to all declared, but unpaid dividends declared prior to the date of payment out of assets available for distribution, before any distribution is made for holders of stock that ranks junior in interest to the Series B Preferred Stock, subject to the rights of Ally’s creditors. Series C Preferred Stock In June 2021, we issued 1,000,000 shares of 4.700% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series C, with $0.01 par value and liquidation preference of $1,000 per share. Proceeds from the offering were used to redeem a portion of our 8.125% Fixed Rate/Floating Rate Trust Preferred Securities, Series 2 of GMAC Capital Trust I. Dividends on shares of the Series C Preferred Stock are discretionary and are not cumulative. Holders of the Series C Preferred Stock will be entitled to receive, if, when and as declared by our Board, or a duly authorized committee of the Board, out of legally available assets, non-cumulative cash dividends quarterly in arrears on February 15, May 15, August 15 and November 15 of each year, beginning on August 15, 2021. Dividends will accrue (i) from the date of original issue to, but excluding, May 15, 2028, at a fixed rate of 4.700% per annum and (ii) from, and including, May 15, 2028, during each seven-year reset period, at a rate per annum equal to the seven-year treasury rate as of the most recent reset dividend determination date plus 3.481% on the liquidation preference amount of $1,000 per share. So long as any share of Series C Preferred Stock remains outstanding, unless the dividends for the most recently completed dividend period have been paid in full, or set aside for payment, on all outstanding shares of Series C Preferred Stock, we will be prohibited, subject to certain specified exceptions, from (i) declaring or paying any dividends or making any distributions with respect to any stock that ranks on a parity basis with, or junior in interest to, the Series C Preferred Stock or (ii) repurchasing, redeeming, or otherwise acquiring for consideration, directly or indirectly, any stock that ranks on a parity basis with, or junior in interest to, the Series C Preferred Stock. The holders of the Series C Preferred Stock do not have voting rights other than those set forth in the certificate of designations for the Series C Preferred Stock included in Ally’s Certificate of Incorporation. The Series C Preferred Stock does not have a stated maturity date, and will be perpetual unless redeemed at Ally’s option. Ally is not required to redeem the Series C Preferred Stock and holders of the Series C Preferred Stock have no right to require Ally to redeem their shares. Ally may, at its option, redeem the shares of Series C Preferred stock (i) in whole or in part, on any dividend payment date on or after May 15, 2028, or (ii) in whole, but not in part, at any time within 90 days following a regulatory capital treatment event. In the event of any liquidation, dissolution or winding up of the affairs of Ally, holders of the Series C Preferred Stock will be entitled to receive the liquidation amount per share of Series C Preferred Stock and an amount equal to all declared, but unpaid dividends declared prior to the date of payment out of assets available for distribution, before any distribution is made for holders of stock that ranks junior in interest to the Series C Preferred Stock, subject to the rights of Ally’s creditors. The following table summarizes information about our preferred stock. June 30, 2021 Series B preferred stock (a) Issuance date April 22, 2021 Carrying value ($ in millions) $ 1,335 Par value (per share) $ 0.01 Liquidation preference (per share) $ 1,000 Number of shares authorized 1,350,000 Number of shares issued and outstanding 1,350,000 Dividend/coupon Prior to May 15, 2026 4.700% On and after May 15, 2026 Five Year Treasury + 3.868% Series C preferred stock (a) Issuance date June 2, 2021 Carrying value ($ in millions) $ 989 Par value (per share) $ 0.01 Liquidation preference (per share) $ 1,000 Number of shares authorized 1,000,000 Number of shares issued and outstanding 1,000,000 Dividend/coupon Prior to May 15, 2028 4.700% On and after May 15, 2028 Seven Year Treasury + 3.481% (a) We may, at our option, redeem the Series B and Series C shares on any dividend payment date on or after May 15, 2026, or May 15, 2028, respectively, or at any time within 90 days following a regulatory event that precludes the instruments from being included in additional Tier 1 capital.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following tables present changes, net of tax, in each component of accumulated other comprehensive income. Three months ended June 30, ($ in millions) Unrealized gains on investment securities (a) Translation adjustments and net investment hedges (b) Cash flow hedges (b) Defined benefit pension plans Accumulated other comprehensive income Balance at April 1, 2020 $ 661 $ 18 $ 130 $ (103) $ 706 Net change 122 1 (14) — 109 Balance at June 30, 2020 $ 783 $ 19 $ 116 $ (103) $ 815 Balance at April 1, 2021 $ 53 $ 20 $ 65 $ (111) $ 27 Net change 206 — (17) — 189 Balance at June 30, 2021 $ 259 $ 20 $ 48 $ (111) $ 216 (a) Represents the after-tax difference between the fair value and amortized cost of our available-for-sale securities portfolio. (b) For additional information on derivative instruments and hedging activities, refer to Note 18. Six months ended June 30, ($ in millions) Unrealized gains on investment securities (a) Translation adjustments and net investment hedges (b) Cash flow hedges (b) Defined benefit pension plans Accumulated other comprehensive income Balance at December 31, 2019 $ 208 $ 19 $ 2 $ (106) $ 123 Net change 575 — 114 3 692 Balance at June 30, 2020 $ 783 $ 19 $ 116 $ (103) $ 815 Balance at December 31, 2020 $ 640 $ 19 $ 82 $ (110) $ 631 Net change (381) 1 (34) (1) (415) Balance at June 30, 2021 $ 259 $ 20 $ 48 $ (111) $ 216 (a) Represents the after-tax difference between the fair value and amortized cost of our available-for-sale securities portfolio. (b) For additional information on derivative instruments and hedging activities, refer to Note 18. The following tables present the before- and after-tax changes in each component of accumulated other comprehensive income. Three months ended June 30, 2021 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 276 $ (65) $ 211 Less: Net realized gains reclassified to income from continuing operations 6 (a) (1) (b) 5 Net change 270 (64) 206 Translation adjustments Net unrealized gains arising during the period 2 — 2 Net investment hedges (c) Net unrealized losses arising during the period (3) 1 (2) Cash flow hedges (c) Less: Net realized gains reclassified to income from continuing operations 22 (d) (5) (b) 17 Other comprehensive income $ 247 $ (58) $ 189 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. (b) Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income. (c) For additional information on derivative instruments and hedging activities, refer to Note 18. (d) Includes gains reclassified to interest and fees on finance receivables and loans in our Condensed Consolidated Statement of Comprehensive Income. Three months ended June 30, 2020 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 175 $ (38) $ 137 Less: Net realized gains reclassified to income from continuing operations 19 (a) (4) (b) 15 Net change 156 (34) 122 Translation adjustments Net unrealized gains arising during the period 6 (1) 5 Net investment hedges (c) Net unrealized losses arising during the period (5) 1 (4) Cash flow hedges (c) Less: Net realized gains reclassified to income from continuing operations 19 (5) 14 Other comprehensive income $ 138 $ (29) $ 109 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. (b) Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income. (c) For additional information on derivative instruments and hedging activities, refer to Note 18. Six months ended June 30, 2021 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized losses arising during the period $ (460) $ 109 $ (351) Less: Net realized gains reclassified to income from continuing operations 38 (a) (8) (b) 30 Net change (498) 117 (381) Translation adjustments Net unrealized gains arising during the period 5 (1) 4 Net investment hedges (c) Net unrealized losses arising during the period (5) 2 (3) Cash flow hedges (c) Less: Net realized gains reclassified to income from continuing operations 43 (d) (9) (b) 34 Defined benefit pension plans Net unrealized losses arising during the period (2) 1 (1) Other comprehensive loss $ (543) $ 128 $ (415) (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. (b) Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income. (c) For additional information on derivative instruments and hedging activities, refer to Note 18. (d) Includes gains reclassified to interest and fees on finance receivables and loans in our Condensed Consolidated Statement of Comprehensive Income. Six months ended June 30, 2020 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 877 $ (206) $ 671 Less: Net realized gains reclassified to income from continuing operations 124 (a) (28) (b) 96 Net change 753 (178) 575 Translation adjustments Net unrealized losses arising during the period (7) 2 (5) Net investment hedges (c) Net unrealized gains arising during the period 7 (2) 5 Cash flow hedges (c) Net unrealized gains arising during the period 169 (41) 128 Less: Net realized gains reclassified to income from continuing operations 19 (5) 14 Net change 150 (36) 114 Defined benefit pension plans Net unrealized gains arising during the period 4 (1) 3 Other comprehensive income $ 907 $ (215) $ 692 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. (b) Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income. (c) For additional information on derivative instruments and hedging activities, refer to Note 18.

Earnings per Common Share

Earnings per Common Share	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Earnings per Common Share	Earnings per Common Share The following table presents the calculation of basic and diluted earnings per common share. Three months ended June 30, Six months ended June 30, ($ in millions, except per share data; shares in thousands) (a) 2021 2020 2021 2020 Net income (loss) from continuing operations $ 899 $ 242 $ 1,695 $ (77) Income (loss) from discontinued operations, net of tax 1 (1) 1 (1) Net income (loss) attributable to common stockholders $ 900 $ 241 $ 1,696 $ (78) Basic weighted-average common shares outstanding (b) 370,412 375,051 372,807 375,387 Diluted weighted-average common shares outstanding (b) (c) 373,029 375,762 375,265 375,387 Basic earnings per common share Net income (loss) from continuing operations $ 2.43 $ 0.65 $ 4.55 $ (0.20) Net income (loss) $ 2.43 $ 0.64 $ 4.55 $ (0.21) Diluted earnings per common share Net income (loss) from continuing operations $ 2.41 $ 0.64 $ 4.52 $ (0.20) Net income (loss) $ 2.41 $ 0.64 $ 4.52 $ (0.21) (a) Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers. (b) Includes shares related to share-based compensation that vested but were not yet issued. (c) Due to the antidilutive effect of the net loss from continuing operations for the six months ended June 30, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share. During the three months and six months ended June 30, 2020, there were 2.3 million and 2.4 million, respectively, in shares underlying share-based awards excluded because their inclusion would have been antidilutive. There were no antidilutive shares during the three months and six months ended June 30, 2021.

Regulatory Capital and Other Re

Regulatory Capital and Other Regulatory Matters	6 Months Ended
	Jun. 30, 2021
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Regulatory Capital and Other Regulatory Matters	Regulatory Capital and Other Regulatory Matters Ally is currently subject to enhanced prudential standards that were established by the FRB under the Dodd-Frank Act. Targeted amendments to the Dodd-Frank Act and other financial-services laws were enacted through the EGRRCP Act, including amendments that affect whether and, if so, how the FRB applies enhanced prudential standards to BHCs like us with $100 billion or more but less than $250 billion in total consolidated assets. Through final rules implementing these amendments—which are commonly known as the tailoring framework—the FRB and other U.S. banking agencies established four risk-based categories of prudential standards and capital and liquidity requirements for banking organizations with $100 billion or more in total consolidated assets. The most stringent standards and requirements apply to U.S. global systemically important BHCs, which are assigned to Category I. The assignment of other banking organizations to the remaining three categories is based on measures of size and four other risk-based indicators: cross-jurisdictional activity, wSTWF, nonbank assets, and off-balance-sheet exposure. Under the tailoring framework, Ally is a Category IV firm and, as such, is (1) subject to supervisory stress testing on a two-year cycle, (2) required to submit an annual capital plan to the FRB, (3) exempted from company-run capital stress testing requirements, (4) required to maintain a buffer of unencumbered highly liquid assets to meet projected net stressed cash outflows over a 30-day planning horizon, (5) exempted from the requirements of the LCR and the net stable funding ratio provided that our average wSTWF continues to remain under $50 billion, and (6) exempted from the requirements of the supplementary leverage ratio, the countercyclical capital buffer, and single-counterparty credit limits. Refer to Note 20 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for additional details on the tailoring framework and other applicable capital and liquidity requirements. We continue to be subject to rules enabling the FRB to conduct supervisory stress testing on a more or less frequent basis based on our financial condition, size, complexity, risk profile, scope of operations, or activities, or risks to the U.S. economy. Further, we remain subject to rules requiring the resubmission of our capital plan if we determine that there has been or will be a material change in our risk profile, financial condition, or corporate structure since we last submitted the capital plan or if the FRB determines that (a) our capital plan is incomplete or our capital plan or internal capital adequacy process contains material weaknesses, (b) there has been, or will likely be, a material change in our risk profile (including a material change in our business strategy or any risk exposure), financial condition, or corporate structure, or (c) the BHC stress scenario(s) are not appropriate for our business model and portfolios, or changes in the financial markets or the macroeconomic outlook that could have a material impact on our risk profile and financial condition require the use of updated scenarios. In January 2021 the FDIC announced that, given the passage of time since the last submission of resolution plans and the uncertain economic outlook, the FDIC will resume requiring resolution plan submissions for insured depository institutions with $100 billion or more in assets, including Ally Bank. In June 2021 the FDIC outlined a modified approach to implementing its rule requiring these insured depository institutions to submit resolution plans. The modified approach extends the submission frequency to a three-year cycle, streamlines content requirements, and places enhanced emphasis on engagement with firms. Under the modified approach, resolution plans will be submitted in two groups, with the first group consisting of Ally Bank and other insured depository institutions whose top-tier parent company is not a U.S. global systemically important bank or a Category II firm and the second group consisting of all other insured depository institutions with $100 billion or more in total assets. The FDIC indicated that firms will receive at least 12 months advance notice prior to the due date of their resolution plan submission. Refer to Note 20 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for further discussion about regulatory developments. Basel Capital Framework The FRB and other U.S. banking agencies have adopted risk-based and leverage capital standards that establish minimum capital-to-asset ratios for BHCs, like Ally, and depository institutions, like Ally Bank. The risk-based capital ratios are based on a banking organization’s RWAs, which are generally determined under the standardized approach applicable to Ally and Ally Bank by (1) assigning on-balance-sheet exposures to broad risk-weight categories according to the counterparty or, if relevant, the guarantor or collateral (with higher risk weights assigned to categories of exposures perceived as representing greater risk), and (2) multiplying off-balance-sheet exposures by specified credit conversion factors to calculate credit equivalent amounts and assigning those credit equivalent amounts to the relevant risk-weight categories. The leverage ratio, in contrast, is based on an institution’s average unweighted on-balance-sheet exposures. Under U.S. Basel III, Ally and Ally Bank must maintain a minimum Common Equity Tier 1 risk-based capital ratio of 4.5%, a minimum Tier 1 risk-based capital ratio of 6%, and a minimum total risk-based capital ratio of 8%. In addition to these minimum risk-based capital ratios, Ally and Ally Bank are subject to a capital conservation buffer requirement, which for Ally was 3.5% and for Ally Bank was 2.5% as of June 30, 2021, as further described in the next paragraph. Failure to maintain more than the full amount of the capital conservation buffer requirement would result in automatic restrictions on the ability of Ally and Ally Bank to make capital distributions, including dividend payments and stock repurchases and redemptions, and to pay discretionary bonuses to executive officers. U.S. Basel III also subjects Ally and Ally Bank to a minimum Tier 1 leverage ratio of 4%. In March 2020, the FRB issued a final rule to more closely align forward-looking stress testing results with the FRB’s non-stress regulatory capital requirements for BHCs with $100 billion or more in total consolidated assets and other specified companies. The final rule introduced a stress capital buffer requirement based on firm-specific stress test performance and planned dividends, which for Ally replaced the fixed 2.5% component of the capital conservation buffer requirement. Refer to Note 20 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for details about changes to the CCAR process effected by the final rule. Under the final rule, Ally’s stress capital buffer requirement is the greater of 2.5% and the result of the following calculation: (1) the difference between Ally’s starting and minimum projected Common Equity Tier 1 capital ratios under the severely adverse scenario in the supervisory stress test, plus (2) the sum of the dollar amount of Ally’s planned common stock dividends for each of the fourth through seventh quarters of its nine-quarter capital planning horizon, as a percentage of risk-weighted assets. For a Category IV firm like Ally, the capital conservation buffer requirement comprises the stress capital buffer requirement. The capital conservation buffer requirement applicable to Ally’s depository-institution subsidiary, Ally Bank, continues to be a fixed 2.5%. Ally received its first preliminary stress capital buffer requirement from the FRB in June 2020, which was determined under this new methodology to be 3.5%, was finalized in August 2020, and became effective in October 2020. In June 2020, the FRB also announced its determination that changes in financial markets or the macroeconomic outlook could have a material effect on the risk profiles and financial conditions of firms subject to the capital-plan rule and that, as a result, the firms (including Ally) would be required to resubmit capital plans to the FRB within 45 days after receiving updated stress scenarios from the FRB. In September 2020, the FRB released two updated scenarios—severely adverse and alternative severe. We updated our capital plan in light of firm-specific baseline and stress scenarios, as required, and submitted our updated plan to the FRB in November 2020. In December 2020, the FRB publicly disclosed summary results of this second round of supervisory stress testing and extended its deadline for notifying firms about whether their stress capital buffer requirements will be recalculated to March 31, 2021. On March 25, 2021, the FRB further extended this deadline to June 30, 2021. On June 24, 2021, we received notification from the FRB that our stress capital buffer requirement would not be recalculated in connection with the second round of 2020 supervisory stress testing. Refer to the later section titled Capital Planning and Stress Tests for more information. Under the capital conservation buffer requirement, the maximum amount of capital distributions and discretionary bonus payments that can be made by a banking organization, such as Ally or Ally Bank, is a function of its eligible retained income. During the COVID-19 pandemic, the FRB and other U.S. banking agencies expressed a concern that the definition of eligible retained income would not limit distributions in the gradual manner intended but instead could do so in a sudden and severe manner even if a banking organization were to experience only a modest reduction in its capital ratios. As a result, to better allow a banking organization to use its capital buffer as intended and continue lending in adverse conditions, the U.S. banking agencies issued an interim final rule that became effective in March 2020, and revised the definition of eligible retained income to the greater of (1) a banking organization’s net income for the four preceding calendar quarters, net of any distributions and associated tax effects not already reflected in net income, and (2) the average of a banking organization’s net income over the preceding four quarters. This interim final rule was adopted as final with no changes effective January 1, 2021. Ally and Ally Bank are subject to the U.S. Basel III standardized approach for counterparty credit risk but not to the U.S. Basel III advanced approaches for credit risk or operational risk. Ally is also not subject to the U.S. market-risk capital rule, which applies only to banking organizations with significant trading assets and liabilities. The risk-based capital ratios and the Tier 1 leverage ratio play a central role in PCA, which is an enforcement framework used by the U.S. banking agencies to constrain the activities of depository institutions based on their levels of regulatory capital. Five categories have been established using thresholds for the Common Equity Tier 1 risk-based capital ratio, the Tier 1 risk-based capital ratio, the total risk-based capital ratio, and the Tier 1 leverage ratio: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized. FDICIA generally prohibits a depository institution from making any capital distribution, including any payment of a cash dividend or a management fee to its BHC, if the depository institution would become undercapitalized after the distribution. An undercapitalized institution is also subject to growth limitations and must submit and fulfill a capital restoration plan. While BHCs are not subject to the PCA framework, the FRB is empowered to compel a BHC to take measures—such as the execution of financial or performance guarantees—when PCA is required in connection with one of its depository-institution subsidiaries. In addition, under FDICIA, only well-capitalized and, with a waiver from the FDIC, adequately capitalized institutions may accept brokered deposits, and even adequately capitalized institutions are subject to some restrictions on the rates they may offer for brokered deposits. At June 30, 2021, Ally Bank was well capitalized under the PCA framework. The following table summarizes our capital ratios under U.S. Basel III. June 30, 2021 December 31, 2020 Required minimum (a) Well-capitalized minimum ($ in millions) Amount Ratio Amount Ratio Capital ratios Common Equity Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 15,709 11.32 % $ 14,878 10.64 % 4.50 % (b) Ally Bank 18,113 13.92 17,567 13.38 4.50 6.50 % Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 18,150 13.08 % $ 17,289 12.37 % 6.00 % 6.00 % Ally Bank 18,113 13.92 17,567 13.38 6.00 8.00 Total (to risk-weighted assets) Ally Financial Inc. $ 20,575 14.83 % $ 19,778 14.15 % 8.00 % 10.00 % Ally Bank 19,740 15.17 19,210 14.63 8.00 10.00 Tier 1 leverage (to adjusted quarterly average assets) (c) Ally Financial Inc. $ 18,150 10.00 % $ 17,289 9.41 % 4.00 % (b) Ally Bank 18,113 10.58 17,567 10.12 4.00 5.00 % (a) In addition to the minimum risk-based capital requirements for the Common Equity Tier 1 capital, Tier 1 capital, and total capital ratios, Ally was required to maintain a minimum capital conservation buffer of 3.5% at both June 30, 2021, and December 31, 2020, and Ally Bank was required to maintain a minimum capital conservation buffer of 2.5% at both June 30, 2021, and December 31, 2020. (b) Currently, there is no ratio component for determining whether a BHC is “well-capitalized.” (c) Federal regulatory reporting guidelines require the calculation of adjusted quarterly average assets using a daily average methodology. In December 2018, the FRB and other U.S. banking agencies approved a final rule to address the impact of CECL on regulatory capital by allowing BHCs and banks, including Ally, the option to phase in the day-one impact of CECL over a three-year period. In March 2020, the FRB and other U.S. banking agencies issued an interim final rule that became effective for the first quarter of 2020 and that provides BHCs and banks with an alternative option to temporarily delay an estimate of the impact of CECL, relative to the incurred loss methodology for estimating the allowance for loan losses, on regulatory capital. The interim final rule was clarified and adjusted in a final rule that became effective in September 2020. We have elected this alternative option instead of the one described in the December 2018 rule. As a result, under the final rule, we will delay recognizing the estimated impact of CECL on regulatory capital until after a two-year deferral period, which for us extends through December 31, 2021. Beginning on January 1, 2022, we will be required to phase in 25% of the previously deferred estimated capital impact of CECL, with an additional 25% to be phased in at the beginning of each subsequent year until fully phased in by the first quarter of 2025. The estimated impact of CECL on regulatory capital that we will defer and later phase in is calculated as the entire day-one impact at adoption plus 25% of the subsequent change in allowance during the two-year deferral period. As of June 30, 2021, the total deferred impact on Common Equity Tier 1 capital related to our adoption of CECL was $1.1 billion. At both June 30, 2021, and December 31, 2020, Ally and Ally Bank were “well-capitalized.” Compliance with capital requirements is a strategic priority for Ally. We expect to be in compliance with all applicable requirements within the established timeframes. Capital Planning and Stress Tests Under the tailoring framework described earlier in the section titled Basel Capital Framework , we are generally subject to supervisory stress testing on a two-year cycle and exempted from mandated company-run capital stress testing requirements. We are also required to submit an annual capital plan to the FRB. Our annual capital plan must include an assessment of our expected uses and sources of capital and a description of all planned capital actions over a nine-quarter planning horizon, including any issuance of a debt or equity capital instrument, any dividend or other capital distribution, and any similar action that the FRB determines could have an impact on our capital. The plan must also include a detailed description of our process for assessing capital adequacy, including a discussion of how we, under expected and stressful conditions, will maintain capital commensurate with our risks and above the minimum regulatory capital ratios, will serve as a source of strength to Ally Bank, and will maintain sufficient capital to continue our operations by maintaining ready access to funding, meeting our obligations to creditors and other counterparties, and continuing to serve as a credit intermediary. We submitted our 2020 capital plan in April 2020, which included planned capital distributions to common stockholders through share repurchases and cash dividends over the nine-quarter planning horizon. In June 2020, the FRB provided us with the results of the supervisory stress test, additional industry-wide sensitivity analyses conducted in light of the COVID-19 pandemic, and our preliminary stress capital buffer requirement. As described earlier in the section titled Basel Capital Framework , we updated our capital plan in light of revised stress scenarios from the FRB and submitted our updated plan to the FRB in November 2020. In December 2020, the FRB publicly disclosed summary results of its second round of supervisory stress testing and extended its deadline for notifying firms about whether their stress capital buffer requirements will be recalculated to March 31, 2021. On March 25, 2021, the FRB further extended this deadline to June 30, 2021. On June 24, 2021, we received notification from the FRB that our stress capital buffer requirement would not be recalculated in connection with the second round of 2020 supervisory stress testing. In June 2020, the FRB announced several actions to ensure that large firms, such as Ally, would remain resilient despite the economic uncertainty from the COVID-19 pandemic, including for the third quarter of 2020 (1) the suspension of repurchases by any firm of its common stock, except repurchases relating to issuances of common stock related to employee stock ownership plans, and (2) the disallowance of any increase by a firm in the amount of its common-stock dividends and the imposition of a common-stock dividend limit equal to the average of the firm’s net income for the four preceding calendar quarters. These restrictions were extended by the FRB for the fourth quarter of 2020. In December 2020, the FRB extended and modified these restrictions for the first quarter of 2021 to limit aggregate common-stock dividends and share repurchases to an amount equal to the average of the firm’s net income for the four preceding calendar quarters subject to specified exceptions. On March 25, 2021, the FRB extended these modified restrictions for the second quarter of 2021 and announced that, for a firm such as Ally that is not subject to the 2021 supervisory stress test and on a two-year cycle, the additional restrictions will end after June 30, 2021, and the firm’s stress capital buffer requirement based on the June 2020 supervisory stress test results will remain in place. On January 11, 2021, our Board authorized a stock-repurchase program, permitting us to repurchase up to $1.6 billion of our common stock from time to time from the first quarter of 2021 through the fourth quarter of 2021 subject to restrictions imposed by the FRB. On July 12, 2021, our Board authorized an increase in the maximum amount of this stock-repurchase program, from $1.6 billion to $2.0 billion, and an increase in our cash dividend on common stock, from $0.19 per share for the second quarter of 2021 to $0.25 per share for the third quarter of 2021. In January 2021, the FRB issued a final rule effective April 5, 2021, to align its capital planning and stress capital buffer requirements with the tailoring framework. Under the final rule, unless otherwise directed by the FRB in specified circumstances, Ally and other Category IV firms are generally no longer required to calculate forward-looking projections of revenues, losses, reserves, and pro forma capital levels under scenarios provided by the FRB. Each firm continues to be required, however, to provide a forward-looking analysis of income and capital levels under expected and stressful conditions that are designed by the firm. In addition, for Category IV firms, the final rule updated the frequency of calculating the portion of the stress capital buffer derived from the supervisory stress test to every other year. These firms have the ability to elect to participate in the supervisory stress test—and receive a correspondingly updated stress capital buffer requirement—in a year in which they would not generally be subject to the supervisory stress test. During a year in which a Category IV firm does not undergo a supervisory stress test, the firm would receive an updated stress capital buffer requirement that reflects its updated planned common-stock dividends. The final rule also includes reporting and other changes consistent with the tailoring framework. The deadline for electing to opt into the 2021 supervisory stress test was April 5, 2021, and Ally did not make such an election. We submitted our 2021 capital plan on April 5, 2021, which includes planned capital distributions to common stockholders through share repurchases and cash dividends over the nine-quarter planning horizon and other capital actions. During the second quarter of 2021, we issued $1.35 billion of Series B Preferred Stock and $1.0 billion of Series C Preferred Stock, both of which qualify as additional Tier 1 capital under U.S. Basel III. The proceeds from these issuances were used to redeem a portion of the Series 2 TRUPS then outstanding. Refer to Note 12 and Note 14 for additional details about these instruments and capital actions. On June 28, 2021, we submitted an updated capital plan to the FRB reflecting these capital actions and the increases in our stock-repurchase program and common-stock dividend described above. We expect to receive our final stress capital buffer requirement by August 31, 2021, which will become effective on October 1, 2021. Our ability to make capital distributions, including our ability to pay dividends or repurchase shares of our common stock, will continue to be subject to the FRB’s review and our internal governance requirements, including approval by our Board. The amount and size of any future dividends and share repurchases also will be subject to various factors, including Ally’s capital and liquidity positions, accounting and regulatory considerations (including any restrictions that may be imposed by the FRB), impacts related to the COVID-19 pandemic, financial and operational performance, alternative uses of capital, common-stock price, and general market conditions, and may be extended, modified, or discontinued at any time. The following table presents information related to our common stock and distributions to our common stockholders over the last five quarters. Common stock repurchased during period (a) (b) Number of common shares outstanding Cash dividends declared per common share (c) ($ in millions, except per share data; shares in thousands) Approximate dollar value Number of shares Beginning of period End of period 2020 First quarter $ 104 3,838 374,332 373,155 $ 0.19 Second quarter — 53 373,155 373,837 0.19 Third quarter 1 9 373,837 373,857 0.19 Fourth quarter 1 37 373,857 374,674 0.19 2021 First quarter 219 5,276 374,674 371,805 0.19 Second quarter $ 502 9,641 371,805 362,639 $ 0.19 (a) Includes shares of common stock withheld to cover income taxes owed by participants in our share-based incentive plans. (b) On March 17, 2020, we announced the voluntary suspension of our stock-repurchase program through its termination on June 30, 2020. Consistent with the FRB’s restrictions on common-stock repurchases for large firms such as Ally, described above, we did not implement a new stock-repurchase program or repurchase shares of our common stock, except in connection with compensation plans, for the remainder of 2020. Refer to the discussion above for further details about this action. (c) On July 12, 2021, our Board declared a quarterly cash dividend of $0.25 per share on all common stock, payable on August 16, 2021, to stockholders of record at the close of business on August 2, 2021. Refer to Note 24 for further information regarding this common stock dividend.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities We enter into derivative instruments, which may include interest rate swaps, foreign-currency forwards, equity options, and interest rate options in connection with our risk-management activities. Our primary objective for utilizing derivative financial instruments is to manage interest rate risk associated with our fixed-rate and variable-rate assets and liabilities, foreign exchange risks related to our foreign-currency denominated assets and liabilities, and other market risks related to our investment portfolio. Interest Rate Risk We monitor our mix of fixed-rate and variable-rate assets and liabilities and may enter into interest rate swaps, forwards, and options to achieve our desired mix of fixed-rate and variable-rate assets and liabilities. We execute these trades to modify our exposure to interest rate risk by converting certain fixed-rate instruments to a variable-rate and certain variable-rate instruments to a fixed-rate. We use a mix of both derivatives that qualify for hedge accounting treatment and economic hedges (which do not qualify for hedge accounting treatment). Derivatives qualifying for hedge accounting treatment can include receive-fixed swaps designated as fair value hedges of specific fixed-rate unsecured debt obligations, receive-fixed swaps designated as fair value hedges of specific fixed-rate FHLB advances, pay-fixed swaps designated as fair value hedges of securities within our available-for-sale portfolio, and pay-fixed swaps designated as fair value hedges of closed portfolios of fixed-rate held-for-investment consumer automotive loan assets in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. Other derivatives qualifying for hedge accounting consist of pay-fixed swaps designated as cash flow hedges of the expected future cash flows in the form of interest payments on certain variable-rate borrowings and deposit liabilities, receive-fixed swaps designated as cash flow hedges of the expected future cash flows in the form of interest receipts on certain securities within our available-for-sale portfolio, as well as interest rate floor contracts designated as cash flow hedges of the expected future cash flows in the form of interest receipts on a portion of our dealer floorplan commercial loans. We execute economic hedges, which may consist of interest rate swaps, interest rate caps, forwards, and options to mitigate interest rate risk. We also enter into interest rate lock commitments and forward commitments that are executed as part of our mortgage business that meet the accounting definition of a derivative. Foreign Exchange Risk We enter into derivative financial instrument contracts to mitigate the risk associated with variability in cash flows related to our various foreign-currency exposures. We enter into foreign-currency forwards with external counterparties as net investment hedges of foreign exchange exposure on our investment in foreign subsidiaries. Our equity is impacted by the cumulative translation adjustments resulting from the translation of foreign subsidiary results; this impact is reflected in our accumulated other comprehensive income. We also periodically enter into foreign-currency forwards to economically hedge any foreign-denominated debt, centralized lending, and foreign-denominated third-party loans. These foreign-currency forwards that are used as economic hedges are recorded at fair value with changes recorded as income or expense offsetting the gains and losses on the associated foreign-currency transactions. Investment Risk We enter into equity options to mitigate the risk associated with our exposure to the equity markets. Credit Risk We enter into various retail automotive-loan purchase agreements with certain counterparties. As part of those agreements, Ally may withhold a portion of the purchase price from the counterparty and be required to pay the counterparty all or part of the amount withheld at agreed upon measurement dates and determinable amounts if actual credit performance of the acquired loans on the measurement date is better than or equal to what was estimated at the time of acquisition. Based upon these terms, these contracts meet the accounting definition of a derivative. Counterparty Credit Risk Derivative financial instruments contain an element of credit risk if counterparties are unable to meet the terms of the agreements. Credit risk associated with derivative financial instruments is measured as the net replacement cost should the counterparties that owe us under the contract completely fail to perform under the terms of those contracts, assuming no recoveries of underlying collateral as measured by the market value of the derivative financial instrument. We manage our risk to financial counterparties through internal credit analysis, limits, and monitoring. Additionally, derivatives and repurchase agreements are entered into with approved counterparties using industry standard agreements. We execute certain OTC derivatives, such as interest rate caps and floors, using bilateral agreements with financial counterparties. Bilateral agreements generally require both parties to post collateral in the event the fair values of the derivative financial instruments meet posting thresholds established under the agreements. In the event that either party defaults on the obligation, the secured party may seize the collateral. Payments related to the exchange of collateral for OTC derivatives are recognized as collateral. We also execute certain derivatives, such as interest rate swaps, with clearinghouses, which requires us to post and receive collateral. For these clearinghouse derivatives, these payments are recognized as settlements rather than collateral. Certain derivative instruments contain provisions that require us to either post additional collateral or immediately settle any outstanding liability balances upon the occurrence of a specified credit-risk-related event. No such specified credit-risk-related events occurred during the six months ended June 30, 2021, or 2020. We placed cash and noncash collateral totaling $3 million and $151 million, respectively, supporting our derivative positions at June 30, 2021, compared to $4 million and $145 million of cash and noncash collateral at December 31, 2020, in accounts maintained by counterparties. These amounts include collateral placed at clearinghouses and exclude cash and noncash collateral pledged under repurchase agreements. The receivables for cash collateral placed are included on our Condensed Consolidated Balance Sheet in other assets. We received cash collateral from counterparties totaling $4 million in accounts maintained by counterparties at June 30, 2021. This amount includes collateral received from clearinghouses and exclude cash and noncash collateral pledged under repurchase agreements. The payables for cash collateral received are included on our Condensed Consolidated Balance Sheet in accrued expenses and other liabilities. Included in these amounts is noncash collateral where we have been granted the right to sell or pledge the underlying assets. We have not sold or pledged any of the noncash collateral received under these agreements. Balance Sheet Presentation The following table summarizes the amounts of derivative instruments reported on our Condensed Consolidated Balance Sheet. The amounts are presented on a gross basis, are segregated by derivatives that are designated and qualifying as hedging instruments or those that are not, and are further segregated by type of contract within those two categories. Derivative contracts in a receivable and payable position exclude open trade equity on derivatives cleared through central clearing counterparties. Any associated margin exchanged with our central clearing counterparties are treated as settlements of the derivative exposure, rather than collateral. Such payments are recognized as settlements of the derivatives contracts in a receivable and payable position on our Condensed Consolidated Balance Sheet. Notional amounts are reference amounts from which contractual obligations are derived and are not recorded on the balance sheet. In our view, derivative notional is not an accurate measure of our derivative exposure when viewed in isolation from other factors, such as market rate fluctuations and counterparty credit risk. June 30, 2021 December 31, 2020 Derivative contracts in a Notional amount Derivative contracts in a Notional amount ($ in millions) receivable position payable position receivable position payable position Derivatives designated as accounting hedges Interest rate contracts Swaps $ — $ — $ 18,620 $ — $ — $ 12,385 Foreign exchange contracts Forwards 3 — 170 1 — 164 Total derivatives designated as accounting hedges 3 — 18,790 1 — 12,549 Derivatives not designated as accounting hedges Interest rate contracts Futures and forwards 2 — 314 1 — 391 Written options 7 — 592 15 — 587 Purchased options — — 132 — — — Total interest rate risk 9 — 1,038 16 — 978 Foreign exchange contracts Futures and forwards 1 — 162 — 1 159 Total foreign exchange risk 1 — 162 — 1 159 Credit contracts (a) Other credit derivatives — 46 n/a — 28 n/a Total credit risk — 46 n/a — 28 n/a Equity contracts Written options — 1 1 — 4 2 Purchased options 3 — 1 — — — Total equity risk 3 1 2 — 4 2 Total derivatives not designated as accounting hedges 13 47 1,202 16 33 1,139 Total derivatives $ 16 $ 47 $ 19,992 $ 17 $ 33 $ 13,688 n/a = not applicable (a) The maximum potential amount of undiscounted future payments that could be required under these credit derivatives was $84 million and $56 million as of June 30, 2021, and December 31, 2020, respectively. The following table presents amounts recorded on our Condensed Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges. ($ in millions) Carrying amount of the hedged items Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items Total Discontinued (a) June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 Assets Available-for-sale securities (b) (c) $ 5,380 $ 1,259 $ 9 $ 39 $ 15 $ 28 Finance receivables and loans, net (d) 36,462 28,393 124 225 61 72 Liabilities Long-term debt $ 7,189 $ 8,656 $ 102 $ 169 $ 127 $ 203 (a) Represents the fair value hedging adjustment on qualifying hedges for which the hedging relationship was discontinued. This represents a subset of the amounts reported in the total hedging adjustment. (b) The carrying amount of hedged available-for-sale securities is presented above using amortized cost and includes $3.5 billion and $592 million at June 30, 2021, and December 31, 2020, respectively, related to closed portfolios used to designate hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. Refer to Note 6 for a reconciliation of the amortized cost and fair value of available-for-sale securities. (c) The amount that is identified as the last of layer in the open hedge relationship was $2.9 billion as of June 30, 2021. The basis adjustment associated with the open last of layer relationship was a $5 million liability as of June 30, 2021, which would be allocated across the entire remaining pool upon termination or maturity of the hedge relationship. The amount that has been identified as the last of layer in the discontinued hedge relationship was $1.7 billion and $1.2 billion as of June 30, 2021, and December 31, 2020, respectively. The basis adjustment associated with the discontinued last of layer relationship was a $15 million asset as of June 30, 2021, and a $20 million asset as of December 31, 2020, which was allocated across the entire remaining pool upon termination of the hedge relationship. (d) The hedged item represents the carrying value of the hedged portfolio of assets. The amount identified as the last of layer in the open hedge relationship was $12.7 billion and $9.4 billion at June 30, 2021, and December 31, 2020, respectively. The basis adjustment associated with the open last-of-layer relationship was a $63 million asset as of June 30, 2021, and a $153 million asset as of December 31, 2020, which would be allocated across the entire remaining closed pool upon termination or maturity of the hedge relationship. The amount that is identified as the last of layer in the discontinued hedge relationship was $20.1 billion at June 30, 2021, and $18.5 billion at December 31, 2020. The basis adjustment associated with the discontinued last-of-layer hedge relationship was a $61 million asset and a $72 million asset as of June 30, 2021, and December 31, 2020, respectively, which was allocated across the entire remaining pool upon termination of the hedge relationship. Statement of Comprehensive Income Presentation The following table summarizes the location and amounts of gains and losses on derivative instruments not designated as accounting hedges reported in our Condensed Consolidated Statement of Comprehensive Income. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 (Loss) gain recognized in earnings Interest rate contracts Loss on mortgage and automotive loans, net $ (1) $ — $ (8) $ (15) Other income, net of losses 2 (23) 2 (23) Total interest rate contracts 1 (23) (6) (38) Foreign exchange contracts Other income, net of losses — (5) — 3 Other operating expenses (2) — (4) — Total foreign exchange contracts (2) (5) (4) 3 Credit contracts Other income, net of losses (7) — (15) — Total credit contracts (7) — (15) — Total loss recognized in earnings $ (8) $ (28) $ (25) $ (35) The following tables summarize the location and amounts of gains and losses on derivative instruments designated as qualifying fair value and cash flow hedges reported in our Condensed Consolidated Statement of Comprehensive Income. Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on deposits Interest on long-term debt Three months ended June 30, ($ in millions) 2021 2020 2021 2020 2021 2020 2021 2020 (Loss) gain on fair value hedging relationships Interest rate contracts Hedged fixed-rate unsecured debt $ — $ — $ — $ — $ — $ — $ (66) $ — Derivatives designated as hedging instruments on fixed-rate unsecured debt — — — — — — 66 — Hedged available-for-sale securities — — (4) 4 — — — — Derivatives designated as hedging instruments on available-for-sale securities — — 4 (4) — — — — Hedged fixed-rate consumer automotive loans (38) (23) — — — — — — Derivatives designated as hedging instruments on fixed-rate consumer automotive loans 38 23 — — — — — — Total gain on fair value hedging relationships — — — — — — — — (Loss) gain on cash flow hedging relationships Interest rate contracts Hedged deposit liabilities Reclassified from accumulated other comprehensive income into income — — — — — (2) — — Hedged variable-rate commercial loans Reclassified from accumulated other comprehensive income into income 18 22 — — — — — — Reclassified from accumulated other comprehensive income into income as a result of a forecasted transaction being probable not to occur 4 — — — — — — — Total gain (loss) on cash flow hedging relationships $ 22 $ 22 $ — $ — $ — $ (2) $ — $ — Total amounts presented in the Condensed Consolidated Statement of Comprehensive Income $ 1,588 $ 1,630 $ 147 $ 197 $ 268 $ 541 $ 230 $ 318 Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on deposits Interest on long-term debt Six months ended June 30, ($ in millions) 2021 2020 2021 2020 2021 2020 2021 2020 Gain (loss) on fair value hedging relationships Interest rate contracts Hedged fixed-rate unsecured debt $ — $ — $ — $ — $ — $ — $ 73 $ (170) Derivatives designated as hedging instruments on fixed-rate unsecured debt — — — — — — (73) 170 Hedged available-for-sale securities — — (17) 45 — — — — Derivatives designated as hedging instruments on available-for-sale securities — — 17 (45) — — — — Hedged fixed-rate consumer automotive loans (77) 225 — — — — — — Derivatives designated as hedging instruments on fixed-rate consumer automotive loans 77 (225) — — — — — — Total gain on fair value hedging relationships — — — — — — — — (Loss) gain on cash flow hedging relationships Interest rate contracts Hedged deposit liabilities Reclassified from accumulated other comprehensive income into income — — — — (1) (5) — — Hedged variable-rate commercial loans Reclassified from accumulated other comprehensive income into income 40 25 — — — — — — Reclassified from accumulated other comprehensive income into income as a result of a forecasted transaction being probable not to occur 4 — — — — — — — Total gain (loss) on cash flow hedging relationships $ 44 $ 25 $ — $ — $ (1) $ (5) $ — $ — Total amounts presented in the Condensed Consolidated Statement of Comprehensive Income $ 3,170 $ 3,372 $ 278 $ 423 $ 574 $ 1,133 $ 480 $ 666 During the next 12 months, we estimate $29 million of gains will be reclassified into pretax earnings from derivatives designated as cash flow hedges. The following tables summarize the location and amounts of gains and losses related to interest and amortization on derivative instruments designated as qualifying fair value and cash flow hedges reported in our Condensed Consolidated Statement of Comprehensive Income. Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on long-term debt Three months ended June 30, ($ in millions) 2021 2020 2021 2020 2021 2020 Gain (loss) on fair value hedging relationships Interest rate contracts Amortization of deferred unsecured debt basis adjustments $ — $ — $ — $ — $ 1 $ 2 Interest for qualifying accounting hedges of unsecured debt — — — — 2 — Amortization of deferred secured debt basis adjustments (FHLB advances) — — — — (3) (6) Amortization of deferred basis adjustments of available-for-sale securities — — (1) (2) — — Interest for qualifying accounting hedges of available-for-sale securities — — (3) (2) — — Amortization of deferred loan basis adjustments (11) (13) — — — — Interest for qualifying accounting hedges of consumer automotive loans held-for-investment (32) (38) — — — — Total loss on fair value hedging relationships (43) (51) (4) (4) — (4) Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on long-term debt Six months ended June 30, ($ in millions) 2021 2020 2021 2020 2021 2020 Gain (loss) on fair value hedging relationships Interest rate contracts Amortization of deferred unsecured debt basis adjustments $ — $ — $ — $ — $ 2 $ 8 Interest for qualifying accounting hedges of unsecured debt — — — — 3 — Amortization of deferred secured debt basis adjustments (FHLB advances) — — — — (8) (12) Amortization of deferred basis adjustments of available-for-sale securities — — (3) (3) — — Interest for qualifying accounting hedges of available-for-sale securities — — (4) (2) — — Amortization of deferred loan basis adjustments (24) (26) — — — — Interest for qualifying accounting hedges of consumer automotive loans held-for-investment (62) (47) — — — — Total loss on fair value hedging relationships (86) (73) (7) (5) (3) (4) Gain on cash flow hedging relationships Interest rate contracts Interest for qualifying accounting hedges of variable-rate commercial loans — 1 — — — — Total gain on cash flow hedging relationships $ — $ 1 $ — $ — $ — $ — The following table summarizes the effect of cash flow hedges on accumulated other comprehensive income. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Interest rate contracts (Loss) gain recognized in other comprehensive income $ (22) $ (19) $ (43) $ 150 The following table summarizes the effect of net investment hedges on accumulated other comprehensive income and the Condensed Consolidated Statement of Comprehensive Income. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Foreign exchange contracts (a) (b) (Loss) gain recognized in other comprehensive income $ (3) $ (6) $ (5) $ 6 (a) There were no amounts excluded from effectiveness testing for the three months and six months ended June 30, 2021, or 2020. (b) Gains and losses reclassified from accumulated other comprehensive income are reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. There were no amounts reclassified for the three months and six months ended June 30, 2021, or 2020.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We recognized total income tax expense from continuing operations of $143 million and $354 million for the three months and six months ended June 30, 2021, respectively, compared to income tax expense of $95 million and $3 million for the same periods in 2020. The increases in income tax expense for the three months and six months ended June 30, 2021, compared to the same periods in 2020, were primarily due to the tax effects of an increase in pretax earnings, partially offset by a nonrecurring tax benefit from the release of valuation allowance on foreign tax credit carryforwards during the second quarter of 2021, and a nondeductible goodwill impairment in the second quarter of 2020. The valuation allowance release during the three months ended June 30, 2021, was primarily driven by our current capacity to engage in certain securitization transactions and the market demand from investors related to these transactions, coupled with the anticipated timing of the forecasted expiration of foreign tax credit carryforwards. This release of valuation allowance in continuing operations of approximately $78 million resulted in a significant variation in the customary relationship between pretax income and income tax expense for the six months ended June 30, 2021. The nondeductible goodwill impairment resulted in a significant variation in the customary relationship between pretax income and income tax expense for the six months ended June 30, 2020. Additionally, we recognized total income tax benefit from discontinued operations of $2 million during the second quarter of 2021. This amount includes a $78 million income tax benefit related to our tax election change from deducting foreign taxes paid to claiming the foreign tax credit carryforwards on a prior tax return substantially offset by income tax expense of $76 million related to the establishment of a partial valuation allowance against these tax credit carryforwards.

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Fair Value Measurements For purposes of this disclosure, fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability (exit price) in the principal or most advantageous market in an orderly transaction between market participants at the measurement date under current market conditions. Fair value is based on the assumptions we believe market participants would use when pricing an asset or liability. Additionally, entities are required to consider all aspects of nonperformance risk, including the entity’s own credit standing, when measuring the fair value of a liability. Judgment is used in estimating inputs to our internal valuation models used to estimate our Level 3 fair value measurements. Level 3 inputs such as interest rate movements, prepayment speeds, credit losses, and discount rates are inherently difficult to estimate. Changes to these inputs can have a significant effect on fair value measurements and amounts that could be realized. GAAP specifies a three-level hierarchy that is used when measuring and disclosing fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets (i.e., observable inputs) and the lowest priority to data lacking transparency (i.e., unobservable inputs). An instrument’s categorization within the fair value hierarchy is based on the lowest level of significant input to its valuation. The following is a description of the three hierarchy levels. Level 1 Inputs are quoted prices in active markets for identical assets or liabilities at the measurement date. Additionally, the entity must have the ability to access the active market, and the quoted prices cannot be adjusted by the entity. Level 2 Inputs are other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices in active markets for similar assets or liabilities; quoted prices in inactive markets for identical or similar assets or liabilities; or inputs that are observable or can be corroborated by observable market data by correlation or other means for substantially the full term of the assets or liabilities. Level 3 Unobservable inputs are supported by little or no market activity. The unobservable inputs represent management’s best assumptions of how market participants would price the assets or liabilities. Generally, Level 3 assets and liabilities are valued using pricing models, discounted cash flow methodologies, or similar techniques that require significant judgment or estimation. The following are descriptions of the valuation methodologies used to measure material assets and liabilities at fair value and details of the valuation models, key inputs to those models, and significant assumptions utilized. • Equity securities — We hold various marketable equity securities measured at fair value with changes in fair value recognized in net income. Measurements based on observable market prices are classified as Level 1. • Available-for-sale securities — We carry our available-for-sale securities at fair value based on external pricing sources. We classify our securities as Level 1 when fair value is determined using quoted prices available for the same instruments trading in active markets. We classify our securities as Level 2 when fair value is determined using prices for similar instruments trading in active markets. We perform pricing validation procedures for our available-for-sale securities. • Interests retained in financial asset sales — We retain certain noncertificated interests retained from the sale of automotive finance receivables. Due to inactivity in the market, valuations are based on internally developed discounted cash flow models (an income approach) that use a market-based discount rate; therefore, we classified these assets as Level 3. The valuation considers recent market transactions, experience with similar assets, current business conditions, and analysis of the underlying collateral, as available. To estimate cash flows, we utilize various significant assumptions, including market observable inputs (for example, forward interest rates) and internally developed inputs (for example, prepayment speeds, delinquency levels, and credit losses). • Derivative instruments — We enter into a variety of derivative financial instruments as part of our risk-management strategies. Certain of these derivatives are exchange traded, such as equity options. To determine the fair value of these instruments, we utilize the quoted market prices for those particular derivative contracts; therefore, we classified these contracts as Level 1. We also execute OTC and centrally cleared derivative contracts, such as interest rate swaps, foreign-currency denominated forward contracts, caps, floors, and agency to-be-announced securities. We utilize third-party-developed valuation models that are widely accepted in the market to value these derivative contracts. The specific terms of the contract and market observable inputs (such as interest rate forward curves, interpolated volatility assumptions, or equity pricing) are used in the model. We classified these derivative contracts as Level 2 because all significant inputs into these models were market observable. We also enter into interest rate lock commitments and forward-sale commitments that are executed as part of our mortgage business, certain of which meet the accounting definition of a derivative and therefore are recorded as derivatives on our Condensed Consolidated Balance Sheet. Because these derivatives are valued using internal pricing models with unobservable inputs, they are classified as Level 3. We purchase automotive finance receivables and loans from third parties as part of forward flow arrangements and, from time-to-time, execute opportunistic ad-hoc bulk purchases. As part of those agreements, Ally may withhold a portion of the purchase price from the counterparty and be required to pay the counterparty all or part of the amount withheld at agreed upon measurement dates and determinable amounts if actual credit performance of the acquired loans on the measurement date is better than or equal to what was estimated at the time of acquisition. Because these contracts meet the accounting definition of a derivative, we recognize a liability at fair value for these deferred purchase price payments. The fair value of these liabilities is determined using a discounted cash flow method. To estimate cash flows, we utilize various significant assumptions, including market observable inputs (for example, forward interest rates) and internally developed inputs (for example, prepayment speeds, delinquency levels, and expected credit losses). These liabilities are valued using internal loss models with unobservable inputs, and are classified as Level 3. We are required to consider all aspects of nonperformance risk, including our own credit standing, when measuring fair value of a liability. We reduce credit risk on the majority of our derivatives by entering into legally enforceable agreements that enable the posting and receiving of collateral associated with the fair value of our derivative positions on an ongoing basis. In the event that we do not enter into legally enforceable agreements that enable the posting and receiving of collateral, we will consider our credit risk and the credit risk of our counterparties in the valuation of derivative instruments through a CVA, if warranted. The CVA calculation would utilize the credit default swap spreads of the counterparty. Recurring Fair Value The following tables display the assets and liabilities measured at fair value on a recurring basis including financial instruments elected for the fair value option. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The tables below display the hedges separately from the hedged items; therefore, they do not directly display the impact of our risk-management activities. Recurring fair value measurements June 30, 2021 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Equity securities (a) $ 1,017 $ — $ 9 $ 1,026 Available-for-sale securities Debt securities U.S. Treasury and federal agencies 2,148 — — 2,148 U.S. States and political subdivisions — 1,017 7 1,024 Foreign government 17 167 — 184 Agency mortgage-backed residential — 20,835 — 20,835 Mortgage-backed residential — 2,910 — 2,910 Agency mortgage-backed commercial — 4,405 — 4,405 Asset-backed — 555 — 555 Corporate debt — 2,100 — 2,100 Total available-for-sale securities 2,165 31,989 7 34,161 Mortgage loans held-for-sale (b) — — 97 97 Finance receivables and loans, net Consumer other (b) — — 8 8 Derivative contracts in a receivable position Interest rate — — 9 9 Foreign currency — 4 — 4 Equity contracts 3 — — 3 Total derivative contracts in a receivable position 3 4 9 16 Total assets $ 3,185 $ 31,993 $ 130 $ 35,308 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position Credit contracts $ — $ — $ 46 $ 46 Equity contracts 1 — — 1 Total derivative contracts in a payable position 1 — 46 47 Total liabilities $ 1 $ — $ 46 $ 47 (a) Our direct investment in any one industry did not exceed 11%. (b) Carried at fair value due to fair value option elections. Recurring fair value measurements December 31, 2020 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Equity securities (a) $ 1,064 $ — $ 7 $ 1,071 Available-for-sale securities Debt securities U.S. Treasury and federal agencies 803 — — 803 U.S. States and political subdivisions — 1,088 7 1,095 Foreign government 17 159 — 176 Agency mortgage-backed residential — 18,588 — 18,588 Mortgage-backed residential — 2,640 — 2,640 Agency mortgage-backed commercial — 4,189 — 4,189 Asset-backed — 425 — 425 Corporate debt — 1,914 — 1,914 Total available-for-sale securities 820 29,003 7 29,830 Mortgage loans held-for-sale (b) — — 91 91 Finance receivables and loans, net Consumer other (b) — — 8 8 Derivative contracts in a receivable position Interest rate — — 16 16 Foreign currency — 1 — 1 Total derivative contracts in a receivable position — 1 16 17 Total assets $ 1,884 $ 29,004 $ 129 $ 31,017 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position Foreign currency $ — $ 1 $ — $ 1 Credit contracts — — 28 28 Equity contracts 4 — — 4 Total derivative contracts in a payable position 4 1 28 33 Total liabilities $ 4 $ 1 $ 28 $ 33 (a) Our direct investment in any one industry did not exceed 11%. (b) Carried at fair value due to fair value option elections. The following tables present the reconciliation for all Level 3 assets and liabilities measured at fair value on a recurring basis. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The Level 3 items presented below may be hedged by derivatives and other financial instruments that are classified as Level 1 or Level 2. Thus, the following tables do not fully reflect the impact of our risk-management activities. Equity securities (a) Available-for-sale securities Mortgage loans held-for-sale (b) (c) Finance receivables and loans, net (b) (d) Interests retained in financial asset sales ($ in millions) 2021 2020 2021 2020 2021 2020 2021 2020 2021 2020 Assets Fair value at April 1, $ 11 $ 4 $ 7 $ 3 $ 146 $ 68 $ 8 $ 10 $ — $ 1 Net realized/unrealized gains Included in earnings — 1 — — 21 8 — 1 — — Included in OCI — — — — — — — — — — Purchases — — — 2 812 676 5 3 — — Sales (2) — — — (882) (661) — — — — Issuances — — — — — — — — — — Settlements — — — — — — (5) (6) — — Transfers into (out of) Level 3 — — — — — — — — — — Fair value at June 30, $ 9 $ 5 $ 7 $ 5 $ 97 $ 91 $ 8 $ 8 $ — $ 1 Net unrealized gains still held at June 30, Included in earnings $ — $ 1 $ — $ — $ 1 $ 1 $ — $ — $ — $ — Included in OCI — — — — — — — — — — (a) Net realized/unrealized gains are reported as other gain on investments, net, in the Condensed Consolidated Statement of Comprehensive Income. (b) Carried at fair value due to fair value option elections. (c) Net realized/unrealized gains are reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income. (d) Net realized/unrealized gains are reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. Derivative liabilities, net of derivative assets ($ in millions) 2021 (a) 2020 (b) Liabilities Fair value at April 1, $ 28 $ (8) Net realized/unrealized losses (gains) Included in earnings 7 (4) Included in OCI — — Purchases — — Sales — — Issuances 2 — Settlements — — Transfers into (out of) Level 3 — — Fair value at June 30, $ 37 $ (12) Net unrealized losses (gains) still held at June 30, Included in earnings $ 10 $ (4) Included in OCI — — (a) Net realized/unrealized losses (gains) are reported as gain on mortgage and automotive loans, net, and other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. (b) Net realized/unrealized losses (gains) are reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income. Equity securities (a) Available-for-sale securities Mortgage loans held-for-sale (b) (c) Finance receivables and loans, net (b) (d) Interests retained in financial asset sales ($ in millions) 2021 2020 2021 2020 2021 2020 2021 2020 2021 2020 Assets Fair value at January 1, $ 7 $ 8 $ 7 $ 2 $ 91 $ 30 $ 8 $ 11 $ — $ 2 Net realized/unrealized gains (losses) Included in earnings 4 (3) — — 49 13 1 — — — Included in OCI — — — — — — — — — — Purchases — — — 3 1,851 978 8 9 — — Sales (2) — — — (1,894) (930) — — — — Issuances — — — — — — — — — — Settlements — — — — — — (9) (12) — (1) Transfers into (out of) Level 3 — — — — — — — — — — Fair value at June 30, $ 9 $ 5 $ 7 $ 5 $ 97 $ 91 $ 8 $ 8 $ — $ 1 Net unrealized gains (losses) still held at June 30, Included in earnings $ 4 $ (3) $ — $ — $ 1 $ 2 $ — $ — $ — $ — Included in OCI — — — — — — — — — — (a) Net realized/unrealized gains (losses) are reported as other gain on investments, net, in the Condensed Consolidated Statement of Comprehensive Income. (b) Carried at fair value due to fair value option elections. (c) Net realized/unrealized gains are reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income. (d) Net realized/unrealized gains are reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. Derivative liabilities, net of derivative assets ($ in millions) 2021 (a) 2020 (b) Liabilities Fair value at January 1, $ 12 $ (2) Net realized/unrealized losses (gains) Included in earnings 22 (10) Included in OCI — — Purchases — — Sales — — Issuances 3 — Settlements — — Transfers into (out of) Level 3 — — Fair value at June 30, $ 37 $ (12) Net unrealized losses (gains) still held at June 30, Included in earnings $ 25 $ (10) Included in OCI — — (a) Net realized/unrealized losses (gains) are reported as gain on mortgage and automotive loans, net, and other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. (b) Net realized/unrealized losses (gains) are reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income. Nonrecurring Fair Value We may be required to measure certain assets and liabilities at fair value from time to time. These periodic fair value measures typically result from the application of lower-of-cost or fair value accounting or certain impairment measures. These items would constitute nonrecurring fair value measures. The following tables display assets and liabilities measured at fair value on a nonrecurring basis and still held at June 30, 2021, and December 31, 2020, respectively. The amounts are generally as of the end of each period presented, which approximate the fair value measurements that occurred during each period. Nonrecurring fair value measurements Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments Total gain (loss) included in earnings June 30, 2021 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net $ — $ — $ 312 $ 312 $ — n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 27 27 (2) n/m (a) Other — — 59 59 (24) n/m (a) Total commercial finance receivables and loans, net — — 86 86 (26) n/m (a) Other assets Nonmarketable equity investments (c) — 171 33 204 170 n/m (a) Repossessed and foreclosed assets (d) — — 3 3 — n/m (a) Total assets $ — $ 171 $ 434 $ 605 $ 144 n/m n/m = not meaningful (a) We consider the applicable valuation allowance, loan loss allowance, or cumulative impairment to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation reserve, loan loss allowance, or cumulative adjustment. (b) Represents collateral-dependent loans held for investment for which a nonrecurring measurement was made. The related allowance for loan losses represents the cumulative fair value adjustments for those specific receivables. (c) Primarily relates to an investment in one entity for which there was a subsequent funding round resulting in an observable price change in the value of our investment in the entity. Refer to Note 10 for further discussion. (d) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value. Nonrecurring fair value measurements Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments Total gain (loss) included in earnings December 31, 2020 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net $ — $ — $ 315 $ 315 $ — n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 27 27 (5) n/m (a) Other — — 54 54 (20) n/m (a) Total commercial finance receivables and loans, net — — 81 81 (25) n/m (a) Other assets Nonmarketable equity investments (c) — 7 118 125 88 n/m (a) Repossessed and foreclosed assets (d) — — 9 9 (1) n/m (a) Total assets $ — $ 7 $ 523 $ 530 $ 62 n/m n/m = not meaningful (a) We consider the applicable valuation allowance, loan loss allowance, or cumulative impairment to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation reserve, loan loss allowance, or cumulative adjustment. (b) Represents collateral-dependent loans held for investment for which a nonrecurring measurement was made. The related allowance for loan losses represents the cumulative fair value adjustments for those specific receivables. (c) Primarily relates to an investment in one entity for which there was a subsequent funding round. This subsequent funding round resulted in an observable price change in the value of our investment in the entity. Refer to Note 13 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for further discussion. (d) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value. Additionally, on April 30, 2020, we recognized a $50 million impairment of goodwill at Ally Invest. At the time of impairment, the fair value of goodwill at Ally Invest was classified as Level 3 under the fair value hierarchy. Refer to Note 13 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for further discussion. Fair Value Option for Financial Assets We elected the fair value option for an insignificant amount of conforming mortgage loans held for sale and certain acquired unsecured consumer finance receivables. We elected the fair value option for conforming mortgage loans held for sale to mitigate earnings volatility by better matching the accounting for the assets with the related derivatives. We elected the fair value option for certain acquired unsecured consumer finance receivables to mitigate the complexities of recording these loans at amortized cost. Our intent in electing fair value measurement was to mitigate a divergence between accounting gains or losses and economic exposure for certain assets and liabilities. Fair Value of Financial Instruments The following table presents the carrying and estimated fair value of financial instruments, except for those recorded at fair value on a recurring basis presented in the previous section of this note titled Recurring Fair Value. When possible, we use quoted market prices to determine fair value. Where quoted market prices are not available, the fair value is internally derived based on appropriate valuation methodologies with respect to the amount and timing of future cash flows and estimated discount rates. However, considerable judgment is required in interpreting current market data to develop the market assumptions and inputs necessary to estimate fair value. As such, the actual amount received to sell an asset or the amount paid to settle a liability could differ from our estimates. Fair value information presented herein was based on information available at June 30, 2021, and December 31, 2020. Estimated fair value ($ in millions) Carrying value Level 1 Level 2 Level 3 Total June 30, 2021 Financial assets Held-to-maturity securities $ 1,126 $ — $ 1,173 $ — $ 1,173 Loans held-for-sale, net 312 — — 312 312 Finance receivables and loans, net 109,083 — — 116,169 116,169 FHLB/FRB stock (a) 688 — 688 — 688 Financial liabilities Deposit liabilities $ 47,253 $ — $ — $ 47,675 $ 47,675 Long-term debt 16,896 — 14,250 5,484 19,734 December 31, 2020 Financial assets Held-to-maturity securities $ 1,253 $ — $ 1,331 $ — $ 1,331 Loans held-for-sale, net 315 — — 315 315 Finance receivables and loans, net 115,243 — — 122,156 122,156 FHLB/FRB stock (a) 725 — 725 — 725 Financial liabilities Deposit liabilities $ 55,210 $ — $ — $ 55,932 $ 55,932 Short-term borrowings 2,136 — — 2,136 2,136 Long-term debt 22,006 — 19,161 6,310 25,471 (a) Included in other assets on our Condensed Consolidated Balance Sheet. In addition to the financial instruments presented in the above table, we have various financial instruments for which the carrying value approximates the fair value due to their short-term nature and limited credit risk. These instruments include cash and cash equivalents, restricted cash, cash collateral, accrued interest receivable, accrued interest payable, trade receivables and payables, and other short-term receivables and payables. Included in cash and cash equivalents are highly liquid investments that are readily convertible to known amounts of cash and which are subject to an insignificant risk of change in value due to interest rate, quoted price, or penalty on withdrawal. Classified as Level 1 under the fair value hierarchy, cash and cash equivalents generally expose us to limited credit risk and are so near maturity that they present insignificant risk of changes in value because of changes in interest rates.

Offsetting Assets and Liabiliti

Offsetting Assets and Liabilities	6 Months Ended
	Jun. 30, 2021
Offsetting [Abstract]
Offsetting Assets and Liabilities	Offsetting Assets and Liabilities Our derivative contracts and repurchase/reverse repurchase transactions are supported by qualifying master netting and master repurchase agreements. These agreements are legally enforceable bilateral agreements that (i) create a single legal obligation for all individual transactions covered by the agreement to the nondefaulting entity upon an event of default of the counterparty, including bankruptcy, insolvency, or similar proceeding, and (ii) provide the nondefaulting entity the right to accelerate, terminate, and close-out on a net basis all transactions under the agreement and to liquidate or set off collateral promptly upon an event of default of the counterparty. To further mitigate the risk of counterparty default related to derivative instruments, we maintain collateral agreements with certain counterparties. The agreements require both parties to maintain collateral in the event the fair values of the derivative financial instruments meet established thresholds. In the event that either party defaults on the obligation, the secured party may seize the collateral. Generally, our collateral arrangements are bilateral such that we and the counterparty post collateral for the obligation. Contractual terms provide for standard and customary exchange of collateral based on changes in the market value of the outstanding derivatives. A party posts additional collateral when their obligation rises or removes collateral when it falls, such that the net replacement cost of the nondefaulting party is covered in the event of counterparty default. In certain instances, as it relates to our derivative instruments, we have the option to report derivative assets and liabilities as well as assets and liabilities associated with cash collateral received or delivered that is governed by a master netting agreement on a net basis as long as certain qualifying criteria are met. Similarly, for our repurchase/reverse repurchase transactions, we have the option to report recognized assets and liabilities subject to a master netting agreement on a net basis if certain qualifying criteria are met. At June 30, 2021, these instruments are reported as gross assets and gross liabilities on the Condensed Consolidated Balance Sheet. For additional information on derivative instruments and hedging activities, refer to Note 18. The composition of offsetting derivative instruments, financial assets, and financial liabilities was as follows. Gross amounts of recognized assets/liabilities Gross amounts offset on the Condensed Consolidated Balance Sheet Net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Gross amounts not offset on the Condensed Consolidated Balance Sheet ($ in millions) Financial instruments Collateral (a) (b) (c) Net amount June 30, 2021 Assets Derivative assets in net asset positions $ 7 $ — $ 7 $ (1) $ (4) $ 2 Derivative assets with no offsetting arrangements 9 — 9 — — 9 Total assets $ 16 $ — $ 16 $ (1) $ (4) $ 11 Liabilities Derivative liabilities in net asset positions $ 1 $ — $ 1 $ (1) $ — $ — Derivative liabilities with no offsetting arrangements 46 — 46 — — 46 Total liabilities $ 47 $ — $ 47 $ (1) $ — $ 46 December 31, 2020 Assets Derivative assets in net liability positions $ 1 $ — $ 1 $ (1) $ — $ — Derivative assets with no offsetting arrangements 16 — 16 — — 16 Total assets $ 17 $ — $ 17 $ (1) $ — $ 16 Liabilities Derivative liabilities in net liability positions $ 5 $ — $ 5 $ (1) $ (1) $ 3 Derivative liabilities with no offsetting arrangements 28 — 28 — — 28 Total liabilities $ 33 $ — $ 33 $ (1) $ (1) $ 31 (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. We do not record such collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. We have not sold or pledged any of the noncash collateral received under these agreements.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Segment Information	Segment Information Operating segments are defined as components of an enterprise that engage in business activity from which revenues are earned and expenses incurred for which discrete financial information is available that is evaluated regularly by our chief operating decision maker in deciding how to allocate resources and in assessing performance. We report our results of operations on a business-line basis through four operating segments: Automotive Finance operations, Insurance operations, Mortgage Finance operations, and Corporate Finance operations, with the remaining activity reported in Corporate and Other. The operating segments are determined based on the products and services offered, and reflect the manner in which financial information is currently evaluated by management. The following is a description of each of our reportable operating segments. Automotive Finance operations — One of the largest full-service automotive finance operations in the United States providing automotive financing services to consumers, automotive dealers, companies, and municipalities. Our automotive finance services include providing retail installment sales contracts, loans and operating leases, offering term loans to dealers, financing dealer floorplans and other lines of credit to dealers, warehouse lines to automotive retailers, fleet financing, providing financing to companies and municipalities for the purchase or lease of vehicles, and vehicle-remarketing services. Insurance operations — A complementary automotive-focused business offering both consumer finance protection and insurance products sold primarily through the automotive dealer channel, and commercial insurance products sold directly to dealers. As part of our focus on offering dealers a broad range of consumer financial and insurance products, we provide VSCs, VMCs, and GAP products. We also underwrite select commercial insurance coverages, which primarily insure dealers’ vehicle inventory. Mortgage Finance operations — Our held-for-investment portfolio includes our direct-to-consumer Ally Home mortgage offering and bulk purchases of high-quality jumbo and LMI mortgage loans originated by third parties. Through our direct-to-consumer channel, we offer a variety of competitively priced jumbo and conforming fixed- and adjustable-rate mortgage products through a third-party fulfillment provider. Through the bulk loan channel, we purchase loans from several qualified sellers on a servicing-released basis, allowing us to directly oversee servicing activities and manage refinancing through our direct-to-consumer channel. Corporate Finance operations — Primarily provides senior secured leveraged cash flow and asset-based loans to mostly U.S.-based middle-market companies, with a focus on businesses owned by private equity sponsors. These loans are typically used for leveraged buyouts, mergers and acquisitions, debt refinancing, restructurings, and working capital. We also provide, through our Lender Finance business, nonbank wholesale-funded managers with partial funding for their direct-lending activities, which is principally leveraged loans. Additionally, we offer a commercial real estate product to serve companies in the healthcare industry. Corporate and Other primarily consists of centralized corporate treasury activities, such as management of the cash and corporate investment securities and loan portfolios, short- and long-term debt, retail and brokered deposit liabilities, derivative instruments, original issue discount, and the residual impacts of our corporate FTP and treasury ALM activities. Corporate and Other also includes certain equity investments, which primarily consist of FHLB and FRB stock, the management of our legacy mortgage portfolio, which primarily consists of loans originated prior to January 1, 2009, and reclassifications and eliminations between the reportable operating segments. Financial results related to Ally Invest, our online brokerage operations, and Ally Lending, our point-of-sale financing business, are also included within Corporate and Other. We utilize an FTP methodology for the majority of our business operations. The FTP methodology assigns charge rates and credit rates to classes of assets and liabilities based on expected duration and the benchmark rate curve plus an assumed credit spread. Matching duration allocates interest income and interest expense to these reportable segments so their respective results are insulated from interest rate risk. This methodology is consistent with our ALM practices, which includes managing interest rate risk centrally at a corporate level. The net residual impact of the FTP methodology is included within the results of Corporate and Other. The information presented in our reportable operating segments is based in part on internal allocations, which involve management judgment. Financial information for our reportable operating segments is summarized as follows. Three months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2021 Net financing revenue and other interest income $ 1,333 $ 15 $ 23 $ 77 $ 99 $ 1,547 Other revenue 61 344 22 33 78 538 Total net revenue 1,394 359 45 110 177 2,085 Provision for credit losses (23) — — (13) 4 (32) Total noninterest expense 500 272 45 28 230 1,075 Income (loss) from continuing operations before income tax expense $ 917 $ 87 $ — $ 95 $ (57) $ 1,042 Total assets $ 100,162 $ 9,394 $ 13,865 $ 6,246 $ 50,803 $ 180,470 2020 Net financing revenue and other interest income $ 989 $ 12 $ 30 $ 77 $ (54) $ 1,054 Other revenue 40 438 19 6 52 555 Total net revenue 1,029 450 49 83 (2) 1,609 Provision for credit losses 256 — 3 25 3 287 Total noninterest expense 444 322 38 26 155 985 Income (loss) from continuing operations before income tax expense $ 329 $ 128 $ 8 $ 32 $ (160) $ 337 Total assets $ 102,016 $ 8,740 $ 16,669 $ 6,206 $ 50,430 $ 184,061 (a) Net financing revenue and other interest income after the provision for credit losses totaled $1.6 billion and $767 million for the three months ended June 30, 2021, and June 30, 2020, respectively. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2021 Net financing revenue and other interest income $ 2,539 $ 30 $ 46 $ 148 $ 156 $ 2,919 Other revenue 123 723 62 59 136 1,103 Total net revenue 2,662 753 108 207 292 4,022 Provision for credit losses (45) — (4) — 4 (45) Total noninterest expense 987 525 89 59 358 2,018 Income (loss) from continuing operations before income tax expense $ 1,720 $ 228 $ 23 $ 148 $ (70) $ 2,049 Total assets $ 100,162 $ 9,394 $ 13,865 $ 6,246 $ 50,803 $ 180,470 2020 Net financing revenue and other interest income $ 2,029 $ 26 $ 68 $ 145 $ (68) $ 2,200 Other revenue 87 575 29 19 111 821 Total net revenue 2,116 601 97 164 43 3,021 Provision for credit losses 1,022 — 4 139 25 1,190 Total noninterest expense 938 578 73 61 255 1,905 Income (loss) from continuing operations before income tax expense $ 156 $ 23 $ 20 $ (36) $ (237) $ (74) Total assets $ 102,016 $ 8,740 $ 16,669 $ 6,206 $ 50,430 $ 184,061 (a) Net financing revenue and other interest income after the provision for credit losses totaled $3.0 billion and $1.0 billion for the six months ended June 30, 2021, and June 30, 2020, respectively.

Contingencies and Other Risks

Contingencies and Other Risks	6 Months Ended
	Jun. 30, 2021
Loss Contingency [Abstract]
Contingencies and Other Risks	Contingencies and Other Risks As a financial-services company, we are regularly involved in pending or threatened legal proceedings and other matters and are or may be subject to potential liability in connection with them. These legal matters may be formal or informal and include litigation and arbitration with one or more identified claimants, certified or purported class actions with yet-to-be-identified claimants, and regulatory or other governmental information-gathering requests, examinations, investigations, and enforcement proceedings. Our legal matters exist in varying stages of adjudication, arbitration, negotiation, or investigation and span our business lines and operations. Claims may be based in law or equity—such as those arising under contracts or in tort and those involving banking, consumer-protection, securities, tax, employment, and other laws—and some can present novel legal theories and allege substantial or indeterminate damages. Ally and its subsidiaries, including Ally Bank, also are or may be subject to potential liability under other contingent exposures, including indemnification, tax, self-insurance, and other miscellaneous contingencies. We accrue for a legal matter or other contingent exposure when a loss becomes probable and the amount of loss can be reasonably estimated. Accruals are evaluated each quarter and may be adjusted, upward or downward, based on our best judgment after consultation with counsel. No assurance exists that our accruals will not need to be adjusted in the future. When a probable or reasonably possible loss on a legal matter or other contingent exposure could be material to our consolidated financial condition, results of operations, or cash flows, we provide disclosure in this note as prescribed by ASC Topic 450, Contingencies . Refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for additional information related to our policy for establishing accruals. The course and outcome of legal matters are inherently unpredictable. This is especially so when a matter is still in its early stages, the damages sought are indeterminate or unsupported, significant facts are unclear or disputed, novel questions of law or other meaningful legal uncertainties exist, a request to certify a proceeding as a class action is outstanding or granted, multiple parties are named, or regulatory or other governmental entities are involved. Other contingent exposures and their ultimate resolution are similarly unpredictable for reasons that can vary based on the circumstances. As a result, we often are unable to determine how or when threatened or pending legal matters and other contingent exposures will be resolved and what losses may be incrementally and ultimately incurred. Actual losses may be higher or lower than any amounts accrued or estimated for those matters and other exposures, possibly to a significant degree. Subject to the foregoing, based on our current knowledge and after consultation with counsel, we do not believe that the ultimate outcomes of currently threatened or pending legal matters and other contingent exposures are likely to be material to our consolidated financial condition after taking into account existing accruals. In light of the uncertainties inherent in these matters and other exposures, however, one or more of them could be material to our results of operations or cash flows during a particular reporting period, depending on factors such as the amount of the loss or liability and the level of our income for that period. Descriptions of certain of our legal matters follow. We do not believe, however, that an estimate of reasonably possible losses or a range of reasonably possible losses—whether in excess of any related accrual or where no accrual exists—can be made for any of these matters for some or all of the reasons identified in the preceding paragraphs. Purported and Certified Class Actions In March 2016, Ally filed an action against two buyers of a motor vehicle— Ally Financial Inc. v. Alberta Haskins and David Duncan , Case No. 16JE-AC01713-01, in the Circuit Court of Jefferson County, Missouri—for the purpose of collecting the deficiency that remained due under the retail installment sales contract after the buyers had defaulted and the vehicle had been repossessed and disposed of. In March 2017, the buyers filed a second amended answer and counterclaim on behalf of nationwide and Missouri classes, arguing that Ally’s pre- and post-disposition notices had violated Article 9 of the Uniform Commercial Code as adopted in each State and other applicable jurisdiction. The request for relief included an indeterminate amount of actual, statutory, and punitive damages as well as fees, costs, interest, and other remedies. In May 2018, the circuit court certified the nationwide and Missouri classes and denied Ally’s motion for partial summary judgment. In September 2018, the case was reassigned to a different circuit-court judge, and in February 2019, Ally filed a motion to decertify the nationwide and Missouri classes. In November 2019, the circuit court denied Ally’s motion to decertify. In December 2019, Ally filed a petition with the Missouri Court of Appeals and then with the Missouri Supreme Court for a writ prohibiting the circuit court from taking further action other than vacating the order denying decertification, but each of those petitions was denied. In June 2020, the buyers on behalf of the certified nationwide and Missouri classes filed a motion for partial summary judgment on liability and damages, including statutory damages, the waiver of amounts due, and prejudgment interest. These damages, if awarded by the court, could be significant. In August 2020, Ally filed a petition for a writ of certiorari with the United States Supreme Court— Ally Financial Inc. v. Alberta Haskins et al. , No. 20-177—requesting review of the Missouri Supreme Court’s order denying Ally’s petition for a writ of prohibition. In December 2020, Ally—while maintaining its denial of any liability or wrongdoing and its other positions in the case—entered into a binding memorandum of understanding with the buyers, on behalf of the nationwide and Missouri classes, to fully settle the case. In January 2021, the United States Supreme Court granted a joint motion to defer consideration of Ally’s petition for a writ of certiorari. In March 2021, the parties executed and filed with the circuit court a class-action settlement agreement and release that includes provisions for a cash payment of $87.5 million by Ally, a waiver of $700 million in charged-off deficiency balances by Ally, a request by Ally that identified consumer reporting agencies delete specified trade lines, and a release by the nationwide and Missouri classes of related claims against Ally. The class-action settlement agreement and release was preliminarily approved by the circuit court in March 2021, and specified notices have been delivered to class members. The class-action settlement agreement and release remains subject to final approval by the circuit court and related conditions. During the year ended December 31, 2020, Ally established an accrual of $87.5 million related to this matter. In February 2021, a purported class action— Cheng et al. v. Ally Financial Inc. et al. —was filed in the U.S. District Court for the Northern District of California (Case No. 3:21-cv-00781). The complaint alleges that Ally and other defendants conspired to prevent or restrict retail investors from purchasing or otherwise acquiring long positions in specified equity securities and to force them instead to sell their positions in those securities at artificially lower prices. The claims include alleged violations of antitrust and unfair-competition laws, misleading public statements, breach of fiduciary duty and the implied covenant of good faith and fair dealing, negligence, and constructive fraud. The request for relief includes an indeterminate amount of damages, fees, costs, and interest, injunctive relief, and other remedies. Also in February 2021, three other purported class actions were filed— Clapp et al. v. Ally Financial Inc. et al. in the U.S. District Court for the Northern District of California (Case No. 3:21-cv-00896), Dechirico et al. v. Ally Financial Inc. et al. in the U.S. District Court for the Eastern District of New York (Case No. 1:21-cv-00677), and Ross et al. v. Ally Financial Inc. et al. in the U.S. District Court for the Southern District of Texas (Case No. 4:21-cv-00292). In March 2021, a fifth purported class action— Fox et al. v. Ally Financial Inc. et al. —was filed in the U.S. District Court for the District of Minnesota (Case No. 0:21-cv-00689). In April 2021, the U.S. Judicial Panel on Multidistrict Litigation consolidated all five of these cases into a multidistrict litigation proceeding in the U.S. District Court for the Southern District of Florida with the caption In re: January 2021 Short Squeeze Trading Litigation (Case No. 1:21-md-02989). Also in April 2021, a sixth purported class action— D’Agostino et al. v. Ally Financial Inc. et al .— was filed in the U.S. District Court for the Southern District of Florida (Case No. 1:21-cv-21458), and in July 2021, this case was consolidated into the multidistrict litigation proceeding as well. The allegations and requested relief in the Clapp, Dechirico, Ross, Fox, and D’Agostino complaints are substantially similar to those included in the Cheng complaint. We intend to vigorously defend against these actions.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Declaration of Common Dividend and Share Repurchase Authorization On July 12, 2021, our Board declared a quarterly cash dividend of $0.25 per share on all common stock. The dividend is payable on August 16, 2021, to stockholders of record at the close of business on August 2, 2021. At the same time, our Board authorized a stock-repurchase program, permitting us to repurchase up to $2.0 billion of common stock for 2021. This stock-repurchase program replaces the $1.6 billion program previously authorized on January 11, 2021. Partial Redemption of Trust Preferred Securities On July 2, 2021, we effectuated the redemption of $1.04 billion, or 41,600,000 shares of the Series 2 TRUPS then outstanding, following the issuance of $1.0 billion of preferred stock, Series C, on June 2, 2021. Refer to Note 12 for further information regarding this partial redemption of our Trust Preferred Securities.

Description of Business, Basi_2

Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and that affect income and expenses during the reporting period and related disclosures. In developing the estimates and assumptions, management uses all available evidence; however, actual results could differ because of uncertainties associated with estimating the amounts, timing, and likelihood of possible outcomes. Our most significant estimates pertain to the allowance for loan losses, valuations of automotive lease assets and residuals, fair value of financial instruments, and the determination of the provision for income taxes.
Income Taxes	Income Taxes In calculating the provision for interim income taxes, in accordance with ASC 740, Income Taxes , we apply an estimated annual effective tax rate to year-to-date ordinary income. At the end of each interim period, we estimate the effective tax rate expected to be applicable for the full fiscal year. This method differs from that described in Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K, which describes our annual significant income tax accounting policy and related methodology. Refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K regarding additional significant accounting policies.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards Reference Rate Reform (ASU 2021-01) In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848) : Scope , which clarified the scope of ASU 2020-04, Reference Rate Reform: Facilitation of the Effects of Reference Rate Reform on Financial Reporting , indicating that certain optional expedients and exceptions included in ASU 2020-04 are applicable to derivative instruments affected by the market-wide change in interest rates used for discounting, margining, or contract price alignment. We adopted the amendments in this ASU immediately upon issuance in January 2021 on a prospective basis and will apply this guidance, along with the guidance from ASU 2020-04, as contracts are modified through December 2022. The adoption did not have an immediate direct impact on our financial statements. We do not expect there to be a material impact to our financial statements.
Fair Value Measurements	GAAP specifies a three-level hierarchy that is used when measuring and disclosing fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets (i.e., observable inputs) and the lowest priority to data lacking transparency (i.e., unobservable inputs). An instrument’s categorization within the fair value hierarchy is based on the lowest level of significant input to its valuation. The following is a description of the three hierarchy levels. Level 1 Inputs are quoted prices in active markets for identical assets or liabilities at the measurement date. Additionally, the entity must have the ability to access the active market, and the quoted prices cannot be adjusted by the entity. Level 2 Inputs are other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices in active markets for similar assets or liabilities; quoted prices in inactive markets for identical or similar assets or liabilities; or inputs that are observable or can be corroborated by observable market data by correlation or other means for substantially the full term of the assets or liabilities. Level 3 Unobservable inputs are supported by little or no market activity. The unobservable inputs represent management’s best assumptions of how market participants would price the assets or liabilities. Generally, Level 3 assets and liabilities are valued using pricing models, discounted cash flow methodologies, or similar techniques that require significant judgment or estimation.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables present a disaggregated view of our revenue from contracts with customers. For further information regarding our revenue recognition policies and details about the nature of our respective revenue streams, refer to Note 1 and Note 3 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K. Three months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated 2021 Revenue from contracts with customers Noninsurance contracts (a) (b) (c) $ — $ 158 $ — $ — $ — $ 158 Remarketing fee income 27 — — — — 27 Brokerage commissions and other revenue — — — — 13 13 Deposit account and other banking fees (d) — — — — 5 5 Brokered/agent commissions — 4 — — — 4 Other 6 — — — 2 8 Total revenue from contracts with customers 33 162 — — 20 215 All other revenue 28 182 22 33 58 323 Total other revenue (e) $ 61 $ 344 $ 22 $ 33 $ 78 $ 538 2020 Revenue from contracts with customers Noninsurance contracts (a) (b) (c) $ — $ 142 $ — $ — $ — $ 142 Remarketing fee income 15 — — — — 15 Brokerage commissions and other revenue — — — — 14 14 Deposit account and other banking fees (d) — — — — 1 1 Brokered/agent commissions — 4 — — — 4 Other 3 — — — — 3 Total revenue from contracts with customers 18 146 — — 15 179 All other revenue 22 292 19 6 37 376 Total other revenue (e) $ 40 $ 438 $ 19 $ 6 $ 52 $ 555 (a) We had opening balances of $3.0 billion and $2.9 billion in unearned revenue associated with outstanding contracts at April 1, 2021, and April 1, 2020, respectively, and $228 million and $211 million of these balances were recognized as insurance premiums and service revenue earned in our Condensed Consolidated Statement of Comprehensive Income during the three months ended June 30, 2021, and June 30, 2020, respectively. (b) At June 30, 2021, we had unearned revenue of $3.1 billion associated with outstanding contracts, and with respect to this balance we expect to recognize revenue of $423 million during the remainder of 2021, $789 million in 2022, $700 million in 2023, $531 million in 2024, and $628 million thereafter. At June 30, 2020, we had unearned revenue of $2.9 billion associated with outstanding contracts. (c) We had deferred insurance assets of $1.8 billion and $1.9 billion at April 1, 2021, and June 30, 2021, respectively, and recognized $133 million of expense during the three months ended June 30, 2021. We had deferred insurance assets of $1.7 billion and $1.8 billion at April 1, 2020, and June 30, 2020, respectively, and recognized $121 million of expense during the three months ended June 30, 2020. (d) Reflects various services fees we charge depositors. Effective May 25, 2021, we eliminated all overdraft fees for Ally Bank deposit accounts. (e) Represents a component of total net revenue. Refer to Note 22 for further information on our reportable operating segments. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated 2021 Revenue from contracts with customers Noninsurance contracts (a) (b) $ — $ 313 $ — $ — $ — $ 313 Remarketing fee income 54 — — — — 54 Brokerage commissions and other revenue — — — — 33 33 Deposit account and other banking fees (c) — — — — 11 11 Brokered/agent commissions — 8 — — — 8 Other 12 — — — 2 14 Total revenue from contracts with customers 66 321 — — 46 433 All other revenue 57 402 62 59 90 670 Total other revenue (d) $ 123 $ 723 $ 62 $ 59 $ 136 $ 1,103 2020 Revenue from contracts with customers Noninsurance contracts (a) (b) $ — $ 285 $ — $ — $ — $ 285 Remarketing fee income 32 — — — — 32 Brokerage commissions and other revenue — — — — 27 27 Deposit account and other banking fees (c) — — — — 5 5 Brokered/agent commissions — 8 — — — 8 Other 8 — — — — 8 Total revenue from contracts with customers 40 293 — — 32 365 All other revenue 47 282 29 19 79 456 Total other revenue (d) $ 87 $ 575 $ 29 $ 19 $ 111 $ 821 (a) We had opening balances of $3.0 billion and $2.9 billion in unearned revenue associated with outstanding contracts at January 1, 2021, and January 1, 2020, respectively, and $453 million and $425 million of these balances were recognized as insurance premiums and service revenue earned in our Condensed Consolidated Statement of Comprehensive Income during the six months ended June 30, 2021, and June 30, 2020. (b) We had deferred insurance assets of $1.8 billion and $1.9 billion at January 1, 2021, and June 30, 2021, respectively, and recognized $265 million of expense during the six months ended June 30, 2021. We had deferred insurance assets of $1.7 billion and $1.8 billion at January 1, 2020, and June 30, 2020, respectively, and recognized $246 million of expense during the six months ended June 30, 2020. (c) Reflects various services fees we charge depositors. Effective May 25, 2021, we eliminated all overdraft fees for Ally Bank deposit accounts. (d) Represents a component of total net revenue. Refer to Note 22 for further information on our reportable operating segments.

Other Income, Net of Losses (Ta

Other Income, Net of Losses (Tables)	6 Months Ended
	Jun. 30, 2021
Other Nonoperating Income (Expense) [Abstract]
Schedule of Other Nonoperating Income, by Component	Details of other income, net of losses, were as follows. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Gain (loss) on nonmarketable equity investments, net $ 99 $ (4) $ 103 $ (4) Late charges and other administrative fees 29 16 60 37 Remarketing fees 27 15 54 32 Income from equity-method investments 31 53 45 52 Other, net 63 11 114 54 Total other income, net of losses $ 249 $ 91 $ 376 $ 171

Reserves for Insurance Losses_2

Reserves for Insurance Losses and Loss Adjustment Expenses (Tables)	6 Months Ended
	Jun. 30, 2021
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense	The following table shows a rollforward of our reserves for insurance losses and loss adjustment expenses. ($ in millions) 2021 2020 Total gross reserves for insurance losses and loss adjustment expenses at January 1, $ 129 $ 122 Less: Reinsurance recoverable 90 88 Net reserves for insurance losses and loss adjustment expenses at January 1, 39 34 Net insurance losses and loss adjustment expenses incurred related to: Current year 136 215 Prior years (a) 1 1 Total net insurance losses and loss adjustment expenses incurred 137 216 Net insurance losses and loss adjustment expenses paid or payable related to: Current year (108) (178) Prior years (27) (26) Total net insurance losses and loss adjustment expenses paid or payable (135) (204) Net reserves for insurance losses and loss adjustment expenses at June 30, 41 46 Plus: Reinsurance recoverable 85 86 Total gross reserves for insurance losses and loss adjustment expenses at June 30, $ 126 $ 132 (a) There have been no material adverse changes to the reserve for prior years.

Other Operating Expenses (Table

Other Operating Expenses (Tables)	6 Months Ended
	Jun. 30, 2021
Operating Expenses [Abstract]
Schedule of Other Operating Cost and Expense, by Component	Details of other operating expenses were as follows. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Insurance commissions $ 138 $ 127 $ 274 $ 253 Technology and communications 81 80 159 159 Lease and loan administration 57 46 112 84 Advertising and marketing 45 32 86 76 Property and equipment depreciation 38 34 74 68 Professional services 28 28 61 59 Charitable contributions 54 3 55 4 Vehicle remarketing and repossession 17 11 38 34 Regulatory and licensing fees 17 29 35 58 Occupancy 18 13 33 29 Non-income taxes 9 7 15 14 Amortization of intangible assets 4 5 9 10 Other 49 44 89 97 Total other operating expenses $ 555 $ 459 $ 1,040 $ 945

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Investment Portfolio	Our investment portfolio includes various debt and equity securities. Our debt securities, which are classified as available-for-sale or held-to-maturity, include government securities, corporate bonds, asset-backed securities, and mortgage-backed securities. The cost, fair value, and gross unrealized gains and losses on available-for-sale and held-to-maturity securities were as follows. June 30, 2021 December 31, 2020 Amortized cost Gross unrealized Fair value Amortized cost Gross unrealized Fair value ($ in millions) gains losses gains losses Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ 2,153 $ 12 $ (17) $ 2,148 $ 783 $ 20 $ — $ 803 U.S. States and political subdivisions 989 37 (2) 1,024 1,046 50 (1) 1,095 Foreign government 181 4 (1) 184 167 9 — 176 Agency mortgage-backed residential 20,615 343 (123) 20,835 18,053 538 (3) 18,588 Mortgage-backed residential 2,890 25 (5) 2,910 2,595 49 (4) 2,640 Agency mortgage-backed commercial 4,355 109 (59) 4,405 4,063 139 (13) 4,189 Asset-backed 552 3 — 555 420 5 — 425 Corporate debt 2,046 63 (9) 2,100 1,809 105 — 1,914 Total available-for-sale securities (a) (b) (c) (d) (e) $ 33,781 $ 596 $ (216) $ 34,161 $ 28,936 $ 915 $ (21) $ 29,830 Held-to-maturity securities Debt securities Agency mortgage-backed residential $ 1,126 $ 57 $ (10) $ 1,173 $ 1,253 $ 79 $ (1) $ 1,331 Total held-to-maturity securities (e) (f) $ 1,126 $ 57 $ (10) $ 1,173 $ 1,253 $ 79 $ (1) $ 1,331 (a) Certain entities related to our Insurance operations are required to deposit securities with state regulatory authorities. These deposited securities totaled $13 million at both June 30, 2021, and December 31, 2020. (b) Certain available-for-sale securities are included in fair value hedging relationships. Refer to Note 18 for additional information. (c) Available-for-sale securities with a fair value of $151 million and $145 million at June 30, 2021, and December 31, 2020, respectively, were pledged for purposes as required by contractual obligation or law. Under these agreements, we granted the counterparty the right to sell or pledge the underlying investment securities. (d) Totals do not include accrued interest receivable, which was $90 million at both June 30, 2021, and December 31, 2020. Accrued interest receivable is included in other assets on our Condensed Consolidated Balance Sheet. (e) There was no allowance for credit losses recorded at June 30, 2021, or December 31, 2020, as management determined that there were no expected credit losses in our portfolio of available-for-sale and held-to-maturity securities. (f) Totals do not include accrued interest receivable, which was $3 million at both June 30, 2021, and December 31, 2020. Accrued interest receivable is included in other assets on our Condensed Consolidated Balance Sheet.
Investments Classified by Contractual Maturity Date	The maturity distribution of debt securities outstanding is summarized in the following tables based upon contractual maturities. Call or prepayment options may cause actual maturities to differ from contractual maturities. Total Due in one year or less Due after one year through five years Due after five years through ten years Due after ten years ($ in millions) Amount Yield Amount Yield Amount Yield Amount Yield Amount Yield June 30, 2021 Fair value of available-for-sale securities (a) U.S. Treasury and federal agencies $ 2,148 1.1 % $ 12 1.6 % $ 510 0.9 % $ 1,626 1.2 % $ — — % U.S. States and political subdivisions 1,024 3.0 51 2.5 102 2.4 212 2.7 659 3.2 Foreign government 184 1.9 13 2.1 106 2.0 65 1.8 — — Agency mortgage-backed residential 20,835 2.6 — — — — 31 2.0 20,804 2.6 Mortgage-backed residential 2,910 2.8 — — — — 28 2.9 2,882 2.8 Agency mortgage-backed commercial 4,405 1.9 — — — — 1,753 2.3 2,652 1.7 Asset-backed 555 2.1 — — 350 2.5 194 1.4 11 3.2 Corporate debt 2,100 2.4 103 2.7 849 2.4 1,147 2.4 1 1.7 Total available-for-sale securities $ 34,161 2.4 $ 179 2.5 $ 1,917 2.0 $ 5,056 1.9 $ 27,009 2.5 Amortized cost of available-for-sale securities $ 33,781 $ 178 $ 1,874 $ 4,945 $ 26,784 Amortized cost of held-to-maturity securities Agency mortgage-backed residential $ 1,126 2.9 % $ — — % $ — — % $ — — % $ 1,126 2.9 % Total held-to-maturity securities $ 1,126 2.9 $ — — $ — — $ — — $ 1,126 2.9 December 31, 2020 Fair value of available-for-sale securities (a) U.S. Treasury and federal agencies $ 803 1.2 % $ 13 0.1 % $ 708 1.1 % $ 82 1.7 % $ — — % U.S. States and political subdivisions 1,095 3.0 49 1.4 103 2.3 228 2.7 715 3.3 Foreign government 176 2.1 9 1.7 86 2.3 81 1.9 — — Agency mortgage-backed residential 18,588 3.1 — — — — 37 2.0 18,551 3.1 Mortgage-backed residential 2,640 3.1 — — — — 36 2.9 2,604 3.1 Agency mortgage-backed commercial 4,189 1.9 — — — — 1,628 2.3 2,561 1.7 Asset-backed 425 2.9 — — 349 3.0 49 1.8 27 3.1 Corporate debt 1,914 2.7 155 2.7 625 2.9 1,077 2.6 57 2.1 Total available-for-sale securities $ 29,830 2.8 $ 226 2.3 $ 1,871 2.2 $ 3,218 2.4 $ 24,515 3.0 Amortized cost of available-for-sale securities $ 28,936 $ 224 $ 1,808 $ 3,022 $ 23,882 Amortized cost of held-to-maturity securities Agency mortgage-backed residential $ 1,253 3.0 % $ — — % $ — — % $ — — % $ 1,253 3.0 % Total held-to-maturity securities $ 1,253 3.0 $ — — $ — — $ — — $ 1,253 3.0 (a) Yield is calculated using the effective yield of each security at the end of the period, weighted based on the market value. The effective yield considers the contractual coupon and amortized cost, and excludes expected capital gains and losses.
Investment Income	The following table presents interest and dividends on investment securities. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Taxable interest $ 131 $ 177 $ 245 $ 382 Taxable dividends 7 5 12 10 Interest and dividends exempt from U.S. federal income tax 5 5 10 8 Interest and dividends on investment securities $ 143 $ 187 $ 267 $ 400
Schedule of Realized Gain (Loss)	The following table presents gross gains and losses realized upon the sales of available-for-sale securities, and net gains or losses on equity securities held during the period. Three months ended June 30, Six months ended June 30, ( $ in millions) 2021 2020 2021 2020 Available-for-sale securities Gross realized gains $ 6 $ 19 $ 38 $ 124 Net realized gains on available-for-sale securities 6 19 38 124 Net realized gain on equity securities 40 80 114 81 Net unrealized gain (loss) on equity securities 19 89 36 (96) Other gain on investments, net $ 65 $ 188 $ 188 $ 109
Held to Maturity Debt Securities by Credit Quality	The following table presents the credit quality of our held-to-maturity securities, based on the latest available information as of June 30, 2021, and December 31, 2020. The credit ratings are sourced from nationally recognized statistical rating organizations, which include S&P, Moody’s, and Fitch. They represent a composite of the ratings or, where credit ratings cannot be sourced from the agencies, are presented based on the asset type. All of our held-to-maturity securities were current in their payment of principal and interest as of June 30, 2021, and December 31, 2020. We have not recorded any interest income reversals on our held-to-maturity securities during the six months ended June 30, 2021, or 2020. June 30, 2021 December 31, 2020 ($ in millions) AA Total (a) AA Total (a) Debt securities Agency mortgage-backed residential $ 1,126 $ 1,126 $ 1,253 $ 1,253 Total held-to-maturity securities $ 1,126 $ 1,126 $ 1,253 $ 1,253 (a) Rating agencies indicate that they base their ratings on many quantitative and qualitative factors, which may include capital adequacy, liquidity, asset quality, business mix, level and quality of earnings, and the current operating, legislative, and regulatory environment. A credit rating is not a recommendation to buy, sell, or hold securities, and the ratings are subject to revision or withdrawal at any time by the assigning rating agency.
Schedule of Unrealized Loss on Investments	The following table summarizes available-for-sale securities in an unrealized loss position, which we evaluated to determine if a credit loss exists requiring the recognition of an allowance for credit losses. For additional information on our methodology, refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K. As of June 30, 2021, and December 31, 2020, we did not have the intent to sell the available-for-sale securities with an unrealized loss position and we do not believe it is more likely than not that we will be required to sell these securities before recovery of their amortized cost basis. As a result of this evaluation, management determined that no credit reserves were required at June 30, 2021, or December 31, 2020. We have not recorded any interest income reversals on our available-for-sale securities during the six months ended June 30, 2021, or 2020. June 30, 2021 December 31, 2020 Less than 12 months 12 months or longer Less than 12 months 12 months or longer ($ in millions) Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ 871 $ (17) $ — $ — $ 3 $ — $ — $ — U.S. States and political subdivisions 121 (2) — — 83 (1) — — Foreign government 57 (1) — — 7 — — — Agency mortgage-backed residential 8,530 (123) — — 1,225 (3) — — Mortgage-backed residential 1,109 (5) 4 — 316 (4) — — Agency mortgage-backed commercial 2,764 (59) — — 926 (13) — — Asset-backed 103 — — — 11 — — — Corporate debt 586 (9) 1 — 59 — 5 — Total available-for-sale securities $ 14,141 $ (216) $ 5 $ — $ 2,630 $ (21) $ 5 $ —

Finance Receivables and Loans_2

Finance Receivables and Loans, Net (Tables)	6 Months Ended
	Jun. 30, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Schedule of Accounts, Notes, Loans and Financing Receivable	The composition of finance receivables and loans reported at amortized cost basis was as follows. ($ in millions) June 30, 2021 December 31, 2020 Consumer automotive (a) $ 75,951 $ 73,668 Consumer mortgage Mortgage Finance (b) 13,629 14,632 Mortgage — Legacy (c) 429 495 Total consumer mortgage 14,058 15,127 Consumer other (d) 640 407 Total consumer 90,649 89,202 Commercial Commercial and industrial Automotive 11,303 19,082 Other 5,442 5,242 Commercial real estate 4,823 5,008 Total commercial 21,568 29,332 Total finance receivables and loans (e) (f) $ 112,217 $ 118,534 (a) Certain finance receivables and loans are included in fair value hedging relationships. Refer to Note 18 for additional information. (b) Includes loans originated as interest-only mortgage loans of $6 million and $8 million at June 30, 2021, and December 31, 2020, respectively. All of these loans have exited the interest-only period. (c) Includes loans originated as interest-only mortgage loans of $25 million and $30 million at June 30, 2021, and December 31, 2020, respectively, of which 99% have exited the interest-only period. (d) Includes $8 million of finance receivables at both June 30, 2021, and December 31, 2020, for which we have elected the fair value option. (e) Totals include net unearned income, unamortized premiums and discounts, and deferred fees and costs of $2.2 billion and $2.0 billion at June 30, 2021, and December 31, 2020, respectively. (f) Totals do not include accrued interest receivable, which was $475 million and $587 million at June 30, 2021, and December 31, 2020, respectively. Accrued interest receivable is included in other assets on our Condensed Consolidated Balance Sheet.
Allowance for Credit Losses on Financing Receivables	The following tables present an analysis of the activity in the allowance for loan losses on finance receivables and loans for the three months and six months ended June 30, 2021. Three months ended June 30, 2021 ($ in millions) Consumer automotive Consumer mortgage Consumer other (a) Commercial Total Allowance at April 1, 2021 $ 2,809 $ 26 $ 69 $ 248 $ 3,152 Charge-offs (b) (183) (2) (5) (7) (197) Recoveries 188 3 1 11 203 Net charge-offs 5 1 (4) 4 6 Provision for credit losses (12) (4) 8 (24) (32) Other — 1 (1) — — Allowance at June 30, 2021 $ 2,802 $ 24 $ 72 $ 228 $ 3,126 (a) Excludes $8 million of finance receivables at both April 1, 2021, and June 30, 2021, for which we have elected the fair value option. (b) Refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for information regarding our charge-off policies. Six months ended June 30, 2021 ($ in millions) Consumer automotive Consumer mortgage Consumer other (a) Commercial Total Allowance at January 1, 2021 $ 2,902 $ 33 $ 73 $ 275 $ 3,283 Charge-offs (b) (467) (4) (13) (21) (505) Recoveries 375 6 1 11 393 Net charge-offs (92) 2 (12) (10) (112) Provision for credit losses (8) (11) 11 (37) (45) Other — — — — — Allowance at June 30, 2021 $ 2,802 $ 24 $ 72 $ 228 $ 3,126 (a) Excludes $8 million of finance receivables at both June 30, 2021, and December 31, 2020, for which we have elected the fair value option. (b) Refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for information regarding our charge-off policies. Three months ended June 30, 2020 ($ in millions) Consumer automotive Consumer mortgage Consumer other (a) Commercial Total Allowance at April 1, 2020 $ 2,833 $ 39 $ 45 $ 328 $ 3,245 Charge-offs (b) (245) (2) (4) (40) (291) Recoveries 108 4 — 1 113 Net charge-offs (137) 2 (4) (39) (178) Provision for credit losses 269 1 6 11 287 Other (2) — 2 — — Allowance at June 30, 2020 $ 2,963 $ 42 $ 49 $ 300 $ 3,354 (a) Excludes $10 million and $8 million of finance receivables at April 1, 2020, and June 30, 2020, respectively, for which we have elected the fair value option. (b) Refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for information regarding our charge-off policies. Six months ended June 30, 2020 ($ in millions) Consumer automotive Consumer mortgage Consumer other (a) Commercial Total Allowance at December 31, 2019 $ 1,075 $ 46 $ 9 $ 133 $ 1,263 Cumulative effect of the adoption of Accounting Standards Update 2016-13 1,334 (6) 16 2 1,346 Allowance at January 1, 2020 2,409 40 25 135 2,609 Charge-offs (b) (618) (5) (9) (43) (675) Recoveries 219 9 1 2 231 Net charge-offs (399) 4 (8) (41) (444) Provision for credit losses 954 (2) 31 207 1,190 Other (1) — 1 (1) (1) Allowance at June 30, 2020 $ 2,963 $ 42 $ 49 $ 300 $ 3,354 (a) Excludes $8 million and $11 million of finance receivables at June 30, 2020, and December 31, 2019, respectively, for which we have elected the fair value option. (b) Refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for information regarding our charge-off policies.
Schedule of Sales of Financing Receivables and Loans	The following table presents information about significant sales of finance receivables and loans and transfers of finance receivables and loans from held for investment to held for sale based on net carrying value. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Consumer mortgage $ 84 — $ 413 $ — Total sales and transfers $ 84 $ — $ 413 $ —
Schedule of Purchases of Financing Receivables and Loans	The following table presents information about significant purchases of finance receivables and loans based on unpaid principal balance at the time of purchase. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Consumer automotive $ 727 $ 635 $ 1,304 $ 995 Consumer mortgage 1,744 1,870 1,932 2,354 Commercial — 1 — 1 Total purchases of finance receivables and loans $ 2,471 $ 2,506 $ 3,236 $ 3,350
Schedule of Financing Receivables, Nonaccrual Status	The following tables present the amortized cost of our finance receivables and loans on nonaccrual status. All consumer or commercial finance receivables and loans that were 90 days or more past due were on nonaccrual status as of June 30, 2021, and December 31, 2020. June 30, 2021 ($ in millions) Nonaccrual status at Jan. 1, 2021 Nonaccrual status at Apr. 1, 2021 Nonaccrual status Nonaccrual with no allowance (a) Consumer automotive $ 1,256 $ 1,173 $ 1,033 $ 472 Consumer mortgage Mortgage Finance 67 63 49 26 Mortgage — Legacy 35 32 27 25 Total consumer mortgage 102 95 76 51 Consumer other 3 2 2 — Total consumer 1,361 1,270 1,111 523 Commercial Commercial and industrial Automotive 40 17 33 4 Other 116 150 133 51 Commercial real estate 5 2 6 6 Total commercial 161 169 172 61 Total finance receivables and loans $ 1,522 $ 1,439 $ 1,283 $ 584 (a) Represents a component of nonaccrual status at end of period. December 31, 2020 ($ in millions) Nonaccrual status at Jan. 1, 2020 Nonaccrual status at Apr. 1, 2020 Nonaccrual status Nonaccrual with no allowance (a) Consumer automotive $ 762 $ 1,077 $ 1,256 $ 604 Consumer mortgage Mortgage Finance 17 22 67 18 Mortgage — Legacy 40 40 35 28 Total consumer mortgage 57 62 102 46 Consumer other 2 1 3 — Total consumer 821 1,140 1,361 650 Commercial Commercial and industrial Automotive 73 86 40 10 Other 138 162 116 41 Commercial real estate 4 8 5 5 Total commercial 215 256 161 56 Total finance receivables and loans $ 1,036 $ 1,396 $ 1,522 $ 706 (a) Represents a component of nonaccrual status at end of period.
Troubled Debt Restructurings on Financing Receivables	The following tables present information related to finance receivables and loans recorded at amortized cost modified in connection with a TDR during the period. 2021 2020 Three months ended June 30, ($ in millions) Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Consumer automotive 14,670 $ 271 $ 267 21,293 $ 323 $ 297 Consumer mortgage Mortgage Finance 10 4 5 19 11 11 Mortgage — Legacy 3 1 1 23 3 3 Total consumer mortgage 13 5 6 42 14 14 Total consumer 14,683 276 273 21,335 337 311 Commercial and industrial Automotive 1 1 1 2 31 26 Other — — — 1 23 7 Commercial real estate 1 3 3 — — — Total commercial 2 4 4 3 54 33 Total finance receivables and loans 14,685 $ 280 $ 277 21,338 $ 391 $ 344 2021 2020 Six months ended June 30, ($ in millions) Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Consumer automotive 40,260 $ 743 $ 733 44,093 $ 663 $ 615 Consumer mortgage Mortgage Finance 15 8 9 29 15 15 Mortgage — Legacy 4 1 1 55 7 7 Total consumer mortgage 19 9 10 84 22 22 Total consumer 40,279 752 743 44,177 685 637 Commercial and industrial Automotive 1 1 1 3 38 33 Other 1 33 33 1 23 7 Commercial real estate 1 3 3 — — — Total commercial 3 37 37 4 61 40 Total finance receivables and loans 40,282 $ 789 $ 780 44,181 $ 746 $ 677
Finance Receivables and Loans Redefaulted During the Period	The following tables present information about finance receivables and loans recorded at amortized cost that have redefaulted during the reporting period and were within 12 months or less of being modified as a TDR. Redefault is when finance receivables and loans meet the requirements for evaluation under our charge-off policy (refer to Note 1 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for additional information) except for commercial finance receivables and loans, where redefault is defined as 90 days past due. 2021 2020 Three months ended June 30, ($ in millions) Number of loans Amortized cost Charge-off amount Number of loans Amortized cost Charge-off amount Consumer automotive 1,751 $ 22 $ 11 1,119 $ 11 $ 8 Consumer mortgage Mortgage Finance 1 — — — — — Mortgage — Legacy 2 — — — — — Total consumer finance receivables and loans 1,754 $ 22 $ 11 1,119 $ 11 $ 8 2021 2020 Six months ended June 30, ($ in millions) Number of loans Amortized cost Charge-off amount Number of loans Amortized cost Charge-off amount Consumer automotive 4,565 $ 55 $ 31 2,283 $ 24 $ 17 Consumer mortgage Mortgage Finance 1 — — — — — Mortgage — Legacy 4 — — — — — Total consumer finance receivables and loans 4,570 $ 55 $ 31 2,283 $ 24 $ 17
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable Credit Quality Indicators	The following tables present the amortized cost basis of our consumer finance receivables and loans by credit quality indicator based on delinquency status and origination year. Origination year Revolving loans converted to term June 30, 2021 ($ in millions) 2021 2020 2019 2018 2017 2016 and prior Revolving loans Total Consumer automotive Current $ 19,187 $ 22,144 $ 15,212 $ 9,239 $ 5,073 $ 3,344 $ — $ — $ 74,199 30–59 days past due 69 280 332 244 157 139 — — 1,221 60–89 days past due 14 71 94 66 40 33 — — 318 90 or more days past due 4 35 58 45 33 38 — — 213 Total consumer automotive 19,274 22,530 15,696 9,594 5,303 3,554 — — 75,951 Consumer mortgage Mortgage Finance Current 3,754 2,862 1,430 1,059 1,420 3,002 — — 13,527 30–59 days past due 22 8 5 3 5 17 — — 60 60–89 days past due — — — 2 — 3 — — 5 90 or more days past due — 1 3 9 4 20 — — 37 Total Mortgage Finance 3,776 2,871 1,438 1,073 1,429 3,042 — — 13,629 Mortgage — Legacy Current — — — — — 98 274 30 402 30–59 days past due — — — — — 2 2 — 4 60–89 days past due — — — — — 2 — — 2 90 or more days past due — — — — — 16 4 1 21 Total Mortgage — Legacy — — — — — 118 280 31 429 Total consumer mortgage 3,776 2,871 1,438 1,073 1,429 3,160 280 31 14,058 Consumer other Current 376 205 31 8 2 — — — 622 30–59 days past due 2 2 1 — — — — — 5 60–89 days past due 1 2 — — — — — — 3 90 or more days past due 1 1 — — — — — — 2 Total consumer other (a) 380 210 32 8 2 — — — 632 Total consumer $ 23,430 $ 25,611 $ 17,166 $ 10,675 $ 6,734 $ 6,714 $ 280 $ 31 $ 90,641 (a) Excludes $8 million of finance receivables at June 30, 2021, for which we have elected the fair value option. Origination year Revolving loans converted to term December 31, 2020 ($ in millions) 2020 2019 2018 2017 2016 2015 and prior Revolving loans Total Consumer automotive Current $ 27,255 $ 19,204 $ 12,129 $ 7,060 $ 3,678 $ 1,766 $ — $ — $ 71,092 30–59 days past due 281 466 376 264 174 97 — — 1,658 60–89 days past due 66 165 129 88 55 32 — — 535 90 or more days past due 32 108 96 71 46 30 — — 383 Total consumer automotive 27,634 19,943 12,730 7,483 3,953 1,925 — — 73,668 Consumer mortgage Mortgage Finance Current 3,432 2,410 1,744 2,254 1,177 3,492 — — 14,509 30–59 days past due 10 9 10 11 7 16 — — 63 60–89 days past due 1 1 3 2 1 3 — — 11 90 or more days past due 1 5 8 10 4 21 — — 49 Total Mortgage Finance 3,444 2,425 1,765 2,277 1,189 3,532 — — 14,632 Mortgage — Legacy Current — — — — — 121 303 36 460 30–59 days past due — — — — — 4 2 — 6 60–89 days past due — — — — — 2 — — 2 90 or more days past due — — — — — 20 5 2 27 Total Mortgage — Legacy — — — — — 147 310 38 495 Total consumer mortgage 3,444 2,425 1,765 2,277 1,189 3,679 310 38 15,127 Consumer other Current 306 53 13 4 1 — — — 377 30–59 days past due 9 3 1 — — — — — 13 60–89 days past due 4 1 — 1 — — — — 6 90 or more days past due 2 1 — — — — — — 3 Total consumer other (a) 321 58 14 5 1 — — — 399 Total consumer $ 31,399 $ 22,426 $ 14,509 $ 9,765 $ 5,143 $ 5,604 $ 310 $ 38 $ 89,194 (a) Excludes $8 million of finance receivables at December 31, 2020, for which we have elected the fair value option.
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable Credit Quality Indicators	The following tables present the amortized cost basis of our commercial finance receivables and loans by credit quality indicator based on risk rating and origination year. Origination year Revolving loans converted to term June 30, 2021 ($ in millions) 2021 2020 2019 2018 2017 2016 and prior Revolving loans Total Commercial and industrial Automotive Pass $ 218 $ 353 $ 201 $ 45 $ 52 $ 73 $ 9,261 $ — $ 10,203 Special mention 12 9 23 41 38 37 887 — 1,047 Substandard — 1 — 1 — 2 49 — 53 Doubtful — — — — — — — — — Total automotive 230 363 224 87 90 112 10,197 — 11,303 Other Pass 297 457 556 194 90 218 2,675 86 4,573 Special mention — 75 139 27 86 99 71 17 514 Substandard — 32 25 — 138 90 17 25 327 Doubtful — — — — — 27 — — 27 Loss — — — — 1 — — — 1 Total other 297 564 720 221 315 434 2,763 128 5,442 Commercial real estate Pass 452 1,111 867 731 457 869 3 4 4,494 Special mention — 58 131 45 31 49 — — 314 Substandard — — — — — 13 — — 13 Doubtful — — — — — 2 — — 2 Total commercial real estate 452 1,169 998 776 488 933 3 4 4,823 Total commercial $ 979 $ 2,096 $ 1,942 $ 1,084 $ 893 $ 1,479 $ 12,963 $ 132 $ 21,568 Origination year Revolving loans converted to term December 31, 2020 ($ in millions) 2020 2019 2018 2017 2016 2015 and prior Revolving loans Total Commercial and industrial Automotive Pass $ 869 $ 220 $ 58 $ 91 $ 76 $ 34 $ 15,433 $ — $ 16,781 Special mention 48 23 59 52 9 18 2,013 — 2,222 Substandard 3 2 — — 1 — 72 — 78 Doubtful — — — — — — 1 — 1 Total automotive 920 245 117 143 86 52 17,519 — 19,082 Other Pass 536 622 244 210 81 69 2,142 76 3,980 Special mention 76 169 123 190 102 115 123 43 941 Substandard 33 26 — 108 — 77 21 20 285 Doubtful — — — 6 — 27 2 1 36 Total other 645 817 367 514 183 288 2,288 140 5,242 Commercial real estate Pass 1,108 928 799 580 651 512 — 2 4,580 Special mention 38 132 116 32 49 43 — — 410 Substandard — — — 3 6 7 — — 16 Doubtful — — — — 2 — — — 2 Total commercial real estate 1,146 1,060 915 615 708 562 — 2 5,008 Total commercial $ 2,711 $ 2,122 $ 1,399 $ 1,272 $ 977 $ 902 $ 19,807 $ 142 $ 29,332
Past Due Financing Receivables	The following table presents an analysis of our past-due commercial finance receivables and loans recorded at amortized cost basis. ($ in millions) 30–59 days past due 60–89 days past due 90 days or more past due Total past due Current Total finance receivables and loans June 30, 2021 Commercial Commercial and industrial Automotive $ — $ — $ — $ — $ 11,303 $ 11,303 Other — — — — 5,442 5,442 Commercial real estate — — 2 2 4,821 4,823 Total commercial $ — $ — $ 2 $ 2 $ 21,566 $ 21,568 December 31, 2020 Commercial Commercial and industrial Automotive $ — $ — $ — $ — $ 19,082 $ 19,082 Other — — — — 5,242 5,242 Commercial real estate — — 2 2 5,006 5,008 Total commercial $ — $ — $ 2 $ 2 $ 29,330 $ 29,332

Leasing (Tables)

Leasing (Tables)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Lessee, Operating Lease, Liability, Maturity	The following table presents future minimum rental payments we are required to make under operating leases that have commenced as of June 30, 2021, and that have noncancelable lease terms expiring after June 30, 2021. ($ in millions) 2021 $ 20 2022 35 2023 27 2024 20 2025 18 2026 and thereafter 58 Total undiscounted cash flows 178 Difference between undiscounted cash flows and discounted cash flows (11) Total lease liability $ 167
Lease, Cost	The following table details the components of total net operating lease expense. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Operating lease expense $ 14 $ 11 $ 26 $ 24 Variable lease expense 2 2 4 4 Total lease expense, net (a) $ 16 $ 13 $ 30 $ 28 (a) Included in other operating expenses in our Condensed Consolidated Statement of Comprehensive Income.
Schedule of Investment in Operating Lease	The following table details our investment in operating leases. ($ in millions) June 30, 2021 December 31, 2020 Vehicles $ 12,170 $ 11,182 Accumulated depreciation (1,455) (1,543) Investment in operating leases, net $ 10,715 $ 9,639
Lessor, Operating Lease, Payments to be Received, Maturity	The following table presents future minimum rental payments we have the right to receive under operating leases with noncancelable lease terms expiring after June 30, 2021. ($ in millions) 2021 $ 818 2022 1,326 2023 877 2024 274 2025 36 2026 and thereafter 2 Total lease payments from operating leases $ 3,333
Depreciation Expense on Operating Lease Assets	We recognized operating lease revenue of $384 million and $754 million for the three months and six months ended June 30, 2021, respectively, and $343 million and $710 million for the three months and six months ended June 30, 2020. Depreciation expense on operating lease assets includes net remarketing gains and losses recognized on the sale of operating lease assets. The following table summarizes the components of depreciation expense on operating lease assets. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Depreciation expense on operating lease assets (excluding remarketing gains and losses) (a) $ 210 $ 241 $ 437 $ 491 Remarketing (gains) losses, net (128) 11 (192) 9 Net depreciation expense on operating lease assets $ 82 $ 252 $ 245 $ 500 (a) Includes variable lease payments related to excess mileage and excessive wear and tear on vehicles of $5 million and $10 million during the three months and six months ended June 30, 2021, respectively, and $5 million and $12 million during the three months and six months ended June 30, 2020.
Finance Lease, Liability, Maturity	The following table presents future minimum rental payments we have the right to receive under finance leases with noncancelable lease terms expiring after June 30, 2021. ($ in millions) 2021 $ 90 2022 152 2023 124 2024 97 2025 44 2026 and thereafter 29 Total undiscounted cash flows 536 Difference between undiscounted cash flows and discounted cash flows (53) Present value of lease payments recorded as lease receivable $ 483

Securitizations and Variable _2

Securitizations and Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2021
Securitizations And Variable Interest Entities [Abstract]
Schedule of Variable Interest Entities	The following table presents our involvement in consolidated and nonconsolidated VIEs in which we hold variable interests. For additional detail related to the assets and liabilities of consolidated variable interest entities refer to the Condensed Consolidated Balance Sheet. ($ in millions) Carrying value of total assets Carrying value of total liabilities Assets sold to nonconsolidated VIEs (a) Maximum exposure to loss in nonconsolidated VIEs June 30, 2021 On-balance sheet variable interest entities Consumer automotive $ 18,448 (b) $ 1,964 (c) Commercial automotive 2,306 1 Off-balance sheet variable interest entities Commercial other 1,563 (d) 666 (e) — 2,040 (f) Total $ 22,317 $ 2,631 $ — $ 2,040 December 31, 2020 On-balance sheet variable interest entities Consumer automotive $ 17,833 (b) $ 3,103 (c) Commercial automotive 6,276 1,152 Off-balance sheet variable interest entities Commercial other 1,295 (d) 529 (e) — 1,754 (f) Total $ 25,404 $ 4,784 $ — $ 1,754 (a) Asset values represent the current unpaid principal balance of outstanding consumer finance receivables and loans within the VIEs. (b) Includes $10.9 billion and $9.9 billion of assets that were not encumbered by VIE beneficial interests held by third parties at June 30, 2021, and December 31, 2020, respectively. Ally or consolidated affiliates hold the interests in these assets. (c) Includes $114 million and $94 million of liabilities that were not obligations to third-party beneficial interest holders at June 30, 2021, and December 31, 2020, respectively. (d) Amounts are classified as other assets. (e) Amounts are classified as accrued expenses and other liabilities. (f) For certain nonconsolidated affordable housing entities, maximum exposure to loss represents the yield we guaranteed investors through long-term guarantee contracts. The amount disclosed is based on the unlikely event that the yield delivered to investors in the form of low-income tax housing credits is recaptured. For nonconsolidated equity investments, maximum exposure to loss represents our outstanding investment, additional committed capital, and low-income housing tax credits subject to recapture. The amount disclosed is based on the unlikely event that our committed capital is funded, our investments become worthless, and the tax credits previously delivered to us are recaptured. This required disclosure is not an indication of our expected loss.
Schedule of Cash Flow Received and Paid to Nonconsolidated Securitization Entities	The following table summarizes cash flows received and paid related to SPEs and asset-backed financings where the transfer is accounted for as a sale and we have a continuing involvement with the transferred consumer automotive assets (for example, servicing) that were outstanding during the six months ended June 30, 2021, and 2020. Additionally, this table contains information regarding cash flows received from and paid to nonconsolidated SPEs that existed during each period. Six months ended June 30, ($ in millions) 2021 2020 Consumer automotive Cash flows received on retained interests in securitization entities $ — $ 8 Servicing fees — 2 Cash disbursements for repurchases during the period — (2) Total $ — $ 8

Other Assets (Tables)

Other Assets (Tables)	6 Months Ended
	Jun. 30, 2021
Other Assets [Abstract]
Schedule of Other Assets	The components of other assets were as follows. ($ in millions) June 30, 2021 December 31, 2020 Property and equipment at cost $ 1,668 $ 1,541 Accumulated depreciation (877) (815) Net property and equipment 791 726 Investment in qualified affordable housing projects 1,261 1,095 Nonmarketable equity investments (a) (b) 939 915 Net deferred tax assets 889 94 Restricted cash held for securitization trusts (c) 702 875 Accrued interest, fees, and rent receivables 572 704 Equity-method investments (d) 382 320 Goodwill 343 343 Finance lease right-of-use assets (e) 327 — Operating lease right-of-use assets 142 162 Other accounts receivable 128 166 Restricted cash and cash equivalents (f) 79 78 Net intangible assets (g) 41 50 Fair value of derivative contracts in receivable position (h) 16 17 Other assets 893 870 Total other assets $ 7,505 $ 6,415 (a) Includes investments in FHLB stock of $239 million and $276 million at June 30, 2021, and December 31, 2020, respectively; FRB stock of $449 million at both June 30, 2021, and December 31, 2020; and equity securities without a readily determinable fair value of $251 million and $189 million at June 30, 2021, and December 31, 2020, respectively, measured at cost with adjustments for impairment and observable changes in price. (b) During both the three months and six months ended June 30, 2021, we recorded $81 million of upward adjustments related to equity securities without a readily determinable fair value still held at June 30, 2021, driven primarily by an investment in one entity for which there was a subsequent funding round at a higher valuation during the period, resulting in an observable price change. During both the three months and six months ended June 30, 2021, we recorded $1 million of impairments and downward adjustments related to equity securities without a readily determinable fair value still held at June 30, 2021. Securities held in our portfolio of equity securities without a readily determinable fair value as of June 30, 2021, include cumulative upward adjustments of $176 million and impairments and downward adjustments of $13 million through June 30, 2021. (c) Includes restricted cash collected from customer payments on securitized receivables, which are distributed by us to investors as payments on the related secured debt, and cash reserve deposits utilized as a form of credit enhancement for various securitization transactions. (d) Primarily relates to investments made in connection with our CRA program. (e) For additional information on finance lease right-of-use assets, refer to Note 8. (f) Primarily represents a number of arrangements with third parties where certain restrictions are placed on balances we hold due to collateral agreements associated with operational processes with a third-party bank, or letter of credit arrangements and corresponding collateral requirements. (g) Includes gross intangible assets of $109 million at both June 30, 2021, and December 31, 2020, and accumulated amortization of $68 million and $59 million at June 30, 2021, and December 31, 2020, respectively. (h) For additional information on derivative instruments and hedging activities, refer to Note 18.
Schedule of Goodwill	The carrying balance of goodwill by reportable operating segment was as follows. ($ in millions) Automotive Finance operations Insurance operations Corporate and Other (a) Total Goodwill at December 31, 2020 $ 20 $ 27 $ 296 $ 343 Impairment losses — — — — Goodwill at June 30, 2021 $ 20 $ 27 $ 296 $ 343 (a) Includes $153 million of goodwill associated with Ally Lending at both June 30, 2021, and December 31, 2020, and $143 million of goodwill associated with Ally Invest at both June 30, 2021, and December 31, 2020.

Deposit Liabilities (Tables)

Deposit Liabilities (Tables)	6 Months Ended
	Jun. 30, 2021
Deposits [Abstract]
Schedule of Deposit Liabilities	Deposit liabilities consisted of the following. ($ in millions) June 30, 2021 December 31, 2020 Noninterest-bearing deposits $ 149 $ 128 Interest-bearing deposits Savings, money market, and checking accounts 93,702 83,698 Certificates of deposit 45,253 53,210 Total deposit liabilities $ 139,104 $ 137,036

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Schedule of Short-term Debt	The following table presents the composition of our short-term borrowings portfolio. June 30, 2021 December 31, 2020 ($ in millions) Unsecured Secured (a) Total Unsecured Secured (a) Total Demand notes (b) $ — $ — $ — $ 2,136 $ — $ 2,136 Total short-term borrowings $ — $ — $ — $ 2,136 $ — $ 2,136 (a) Refer to the section below titled Long-Term Debt for further details on assets restricted as collateral for payment of the related debt. (b) On March 1, 2021, we terminated the offering of our demand notes program, and redeemed in full all outstanding demand notes.
Long-term Debt	The following table presents the composition of our long-term debt portfolio. June 30, 2021 December 31, 2020 ($ in millions) Unsecured Secured Total Unsecured Secured Total Long-term debt (a) Due within one year $ 966 $ 6,181 $ 7,147 $ 647 $ 4,438 $ 5,085 Due after one year 8,924 825 9,749 11,367 5,554 16,921 Total long-term debt (b) (c) $ 9,890 $ 7,006 $ 16,896 $ 12,014 $ 9,992 $ 22,006 (a) Includes basis adjustments related to the application of hedge accounting. Refer to Note 18 for additional information. (b) Includes $1.2 billion and $2.6 billion of trust preferred securities at June 30, 2021, and December 31, 2020, respectively. (c) Includes advances, net of hedge basis adjustments, from the FHLB of Pittsburgh of $5.0 billion and $5.8 billion at June 30, 2021, and December 31, 2020, respectively.
Schedule of Maturities of Long-term Debt	The following table presents the scheduled remaining maturity of long-term debt at June 30, 2021, assuming no early redemptions will occur. The amounts below include adjustments to the carrying value resulting from the application of hedge accounting. The actual payment of secured debt may vary based on the payment activity of the related pledged assets. ($ in millions) 2021 2022 2023 2024 2025 2026 and thereafter Total Unsecured Long-term debt $ 1,074 $ 1,103 $ 2,108 $ 1,473 $ 2,360 $ 2,755 $ 10,873 Original issue discount (66) (51) (57) (64) (69) (676) (983) Total unsecured 1,008 1,052 2,051 1,409 2,291 2,079 9,890 Secured Long-term debt 1,459 4,867 617 41 12 10 7,006 Total long-term debt $ 2,467 $ 5,919 $ 2,668 $ 1,450 $ 2,303 $ 2,089 $ 16,896
Pledged Assets for the Payment of the Related Secured Borrowings and Repurchase Agreements	The following summarizes assets restricted as collateral for the payment of the related debt obligation, primarily arising from securitization transactions accounted for as secured borrowings. June 30, 2021 December 31, 2020 ($ in millions) Total (a) Ally Bank Total (a) Ally Bank Consumer mortgage finance receivables $ 13,968 $ 13,968 $ 14,979 $ 14,979 Consumer automotive finance receivables 9,660 9,244 9,953 9,510 Commercial finance receivables 2,147 2,147 10,866 10,866 Total assets restricted as collateral (b) (c) $ 25,775 $ 25,359 $ 35,798 $ 35,355 Secured debt $ 7,006 $ 6,700 $ 9,992 $ 9,634 (a) Ally Bank is a component of the total column. (b) Ally Bank has an advance agreement with the FHLB, and had assets pledged to secure borrowings that were restricted as collateral to the FHLB totaling $14.0 billion and $20.0 billion at June 30, 2021, and December 31, 2020, respectively. These assets were composed primarily of consumer mortgage finance receivables and loans and investment securities. Ally Bank has access to the FRB Discount Window and had assets pledged and restricted as collateral to the FRB totaling $2.4 billion at both June 30, 2021, and December 31, 2020. These assets were composed of consumer automotive finance receivables and loans. Availability under these programs is only for the operations of Ally Bank and cannot be used to fund the operations or liabilities of Ally or its other subsidiaries. (c) Excludes restricted cash and cash reserves for securitization trusts recorded within other assets on the Condensed Consolidated Balance Sheet. Refer to Note 10 for additional information.
Schedule of Committed Funding Facilities	Outstanding Unused capacity (a) Total capacity ($ in millions) June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 Parent funding Secured $ 132 $ — $ 168 $ 560 $ 300 $ 560 Total committed secured credit facilities $ 132 $ — $ 168 $ 560 $ 300 $ 560 (a) Funding from committed secured credit facilities is available on request in the event excess collateral resides in certain facilities or the extent incremental collateral is available and contributed to the facilities.

Accrued Expenses and Other Li_2

Accrued Expenses and Other Liabilities (Tables)	6 Months Ended
	Jun. 30, 2021
Accounts Payable and Accrued Liabilities [Abstract]
Schedule of Accrued Expenses and Other Liabilities	The components of accrued expenses and other liabilities were as follows. ($ in millions) June 30, 2021 December 31, 2020 Accounts payable $ 663 $ 602 Unfunded commitments for investment in qualified affordable housing projects 662 525 Employee compensation and benefits 348 316 Finance lease liabilities 326 — Operating lease liabilities 167 187 Deferred revenue 146 104 Reserves for insurance losses and loss adjustment expenses 126 129 Fair value of derivative contracts in payable position (a) 47 33 Net deferred tax liabilities 17 92 Cash collateral received from counterparties 4 6 Other liabilities 533 440 Total accrued expenses and other liabilities $ 3,039 $ 2,434 (a) For additional information on derivative instruments and hedging activities, refer to Note 18.

Preferred Stock (Tables)

Preferred Stock (Tables)	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Schedule of Preferred Stock	The following table summarizes information about our preferred stock. June 30, 2021 Series B preferred stock (a) Issuance date April 22, 2021 Carrying value ($ in millions) $ 1,335 Par value (per share) $ 0.01 Liquidation preference (per share) $ 1,000 Number of shares authorized 1,350,000 Number of shares issued and outstanding 1,350,000 Dividend/coupon Prior to May 15, 2026 4.700% On and after May 15, 2026 Five Year Treasury + 3.868% Series C preferred stock (a) Issuance date June 2, 2021 Carrying value ($ in millions) $ 989 Par value (per share) $ 0.01 Liquidation preference (per share) $ 1,000 Number of shares authorized 1,000,000 Number of shares issued and outstanding 1,000,000 Dividend/coupon Prior to May 15, 2028 4.700% On and after May 15, 2028 Seven Year Treasury + 3.481% (a) We may, at our option, redeem the Series B and Series C shares on any dividend payment date on or after May 15, 2026, or May 15, 2028, respectively, or at any time within 90 days following a regulatory event that precludes the instruments from being included in additional Tier 1 capital.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income	The following tables present changes, net of tax, in each component of accumulated other comprehensive income. Three months ended June 30, ($ in millions) Unrealized gains on investment securities (a) Translation adjustments and net investment hedges (b) Cash flow hedges (b) Defined benefit pension plans Accumulated other comprehensive income Balance at April 1, 2020 $ 661 $ 18 $ 130 $ (103) $ 706 Net change 122 1 (14) — 109 Balance at June 30, 2020 $ 783 $ 19 $ 116 $ (103) $ 815 Balance at April 1, 2021 $ 53 $ 20 $ 65 $ (111) $ 27 Net change 206 — (17) — 189 Balance at June 30, 2021 $ 259 $ 20 $ 48 $ (111) $ 216 (a) Represents the after-tax difference between the fair value and amortized cost of our available-for-sale securities portfolio. (b) For additional information on derivative instruments and hedging activities, refer to Note 18. Six months ended June 30, ($ in millions) Unrealized gains on investment securities (a) Translation adjustments and net investment hedges (b) Cash flow hedges (b) Defined benefit pension plans Accumulated other comprehensive income Balance at December 31, 2019 $ 208 $ 19 $ 2 $ (106) $ 123 Net change 575 — 114 3 692 Balance at June 30, 2020 $ 783 $ 19 $ 116 $ (103) $ 815 Balance at December 31, 2020 $ 640 $ 19 $ 82 $ (110) $ 631 Net change (381) 1 (34) (1) (415) Balance at June 30, 2021 $ 259 $ 20 $ 48 $ (111) $ 216 (a) Represents the after-tax difference between the fair value and amortized cost of our available-for-sale securities portfolio. (b) For additional information on derivative instruments and hedging activities, refer to Note 18.
Reclassification Out of Accumulated Other Comprehensive Income	The following tables present the before- and after-tax changes in each component of accumulated other comprehensive income. Three months ended June 30, 2021 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 276 $ (65) $ 211 Less: Net realized gains reclassified to income from continuing operations 6 (a) (1) (b) 5 Net change 270 (64) 206 Translation adjustments Net unrealized gains arising during the period 2 — 2 Net investment hedges (c) Net unrealized losses arising during the period (3) 1 (2) Cash flow hedges (c) Less: Net realized gains reclassified to income from continuing operations 22 (d) (5) (b) 17 Other comprehensive income $ 247 $ (58) $ 189 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. (b) Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income. (c) For additional information on derivative instruments and hedging activities, refer to Note 18. (d) Includes gains reclassified to interest and fees on finance receivables and loans in our Condensed Consolidated Statement of Comprehensive Income. Three months ended June 30, 2020 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 175 $ (38) $ 137 Less: Net realized gains reclassified to income from continuing operations 19 (a) (4) (b) 15 Net change 156 (34) 122 Translation adjustments Net unrealized gains arising during the period 6 (1) 5 Net investment hedges (c) Net unrealized losses arising during the period (5) 1 (4) Cash flow hedges (c) Less: Net realized gains reclassified to income from continuing operations 19 (5) 14 Other comprehensive income $ 138 $ (29) $ 109 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. (b) Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income. (c) For additional information on derivative instruments and hedging activities, refer to Note 18. Six months ended June 30, 2021 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized losses arising during the period $ (460) $ 109 $ (351) Less: Net realized gains reclassified to income from continuing operations 38 (a) (8) (b) 30 Net change (498) 117 (381) Translation adjustments Net unrealized gains arising during the period 5 (1) 4 Net investment hedges (c) Net unrealized losses arising during the period (5) 2 (3) Cash flow hedges (c) Less: Net realized gains reclassified to income from continuing operations 43 (d) (9) (b) 34 Defined benefit pension plans Net unrealized losses arising during the period (2) 1 (1) Other comprehensive loss $ (543) $ 128 $ (415) (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. (b) Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income. (c) For additional information on derivative instruments and hedging activities, refer to Note 18. (d) Includes gains reclassified to interest and fees on finance receivables and loans in our Condensed Consolidated Statement of Comprehensive Income. Six months ended June 30, 2020 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 877 $ (206) $ 671 Less: Net realized gains reclassified to income from continuing operations 124 (a) (28) (b) 96 Net change 753 (178) 575 Translation adjustments Net unrealized losses arising during the period (7) 2 (5) Net investment hedges (c) Net unrealized gains arising during the period 7 (2) 5 Cash flow hedges (c) Net unrealized gains arising during the period 169 (41) 128 Less: Net realized gains reclassified to income from continuing operations 19 (5) 14 Net change 150 (36) 114 Defined benefit pension plans Net unrealized gains arising during the period 4 (1) 3 Other comprehensive income $ 907 $ (215) $ 692 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. (b) Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income. (c) For additional information on derivative instruments and hedging activities, refer to Note 18.

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table presents the calculation of basic and diluted earnings per common share. Three months ended June 30, Six months ended June 30, ($ in millions, except per share data; shares in thousands) (a) 2021 2020 2021 2020 Net income (loss) from continuing operations $ 899 $ 242 $ 1,695 $ (77) Income (loss) from discontinued operations, net of tax 1 (1) 1 (1) Net income (loss) attributable to common stockholders $ 900 $ 241 $ 1,696 $ (78) Basic weighted-average common shares outstanding (b) 370,412 375,051 372,807 375,387 Diluted weighted-average common shares outstanding (b) (c) 373,029 375,762 375,265 375,387 Basic earnings per common share Net income (loss) from continuing operations $ 2.43 $ 0.65 $ 4.55 $ (0.20) Net income (loss) $ 2.43 $ 0.64 $ 4.55 $ (0.21) Diluted earnings per common share Net income (loss) from continuing operations $ 2.41 $ 0.64 $ 4.52 $ (0.20) Net income (loss) $ 2.41 $ 0.64 $ 4.52 $ (0.21) (a) Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers. (b) Includes shares related to share-based compensation that vested but were not yet issued. (c) Due to the antidilutive effect of the net loss from continuing operations for the six months ended June 30, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share. During the three months and six months ended June 30, 2020, there were 2.3 million and 2.4 million, respectively, in shares underlying share-based awards excluded because their inclusion would have been antidilutive. There were no antidilutive shares during the three months and six months ended June 30, 2021.

Regulatory Capital and Other _2

Regulatory Capital and Other Regulatory Matters (Tables)	6 Months Ended
	Jun. 30, 2021
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The following table summarizes our capital ratios under U.S. Basel III. June 30, 2021 December 31, 2020 Required minimum (a) Well-capitalized minimum ($ in millions) Amount Ratio Amount Ratio Capital ratios Common Equity Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 15,709 11.32 % $ 14,878 10.64 % 4.50 % (b) Ally Bank 18,113 13.92 17,567 13.38 4.50 6.50 % Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 18,150 13.08 % $ 17,289 12.37 % 6.00 % 6.00 % Ally Bank 18,113 13.92 17,567 13.38 6.00 8.00 Total (to risk-weighted assets) Ally Financial Inc. $ 20,575 14.83 % $ 19,778 14.15 % 8.00 % 10.00 % Ally Bank 19,740 15.17 19,210 14.63 8.00 10.00 Tier 1 leverage (to adjusted quarterly average assets) (c) Ally Financial Inc. $ 18,150 10.00 % $ 17,289 9.41 % 4.00 % (b) Ally Bank 18,113 10.58 17,567 10.12 4.00 5.00 % (a) In addition to the minimum risk-based capital requirements for the Common Equity Tier 1 capital, Tier 1 capital, and total capital ratios, Ally was required to maintain a minimum capital conservation buffer of 3.5% at both June 30, 2021, and December 31, 2020, and Ally Bank was required to maintain a minimum capital conservation buffer of 2.5% at both June 30, 2021, and December 31, 2020. (b) Currently, there is no ratio component for determining whether a BHC is “well-capitalized.” (c) Federal regulatory reporting guidelines require the calculation of adjusted quarterly average assets using a daily average methodology.
Schedule of Common Share Distribution Activity	The following table presents information related to our common stock and distributions to our common stockholders over the last five quarters. Common stock repurchased during period (a) (b) Number of common shares outstanding Cash dividends declared per common share (c) ($ in millions, except per share data; shares in thousands) Approximate dollar value Number of shares Beginning of period End of period 2020 First quarter $ 104 3,838 374,332 373,155 $ 0.19 Second quarter — 53 373,155 373,837 0.19 Third quarter 1 9 373,837 373,857 0.19 Fourth quarter 1 37 373,857 374,674 0.19 2021 First quarter 219 5,276 374,674 371,805 0.19 Second quarter $ 502 9,641 371,805 362,639 $ 0.19 (a) Includes shares of common stock withheld to cover income taxes owed by participants in our share-based incentive plans. (b) On March 17, 2020, we announced the voluntary suspension of our stock-repurchase program through its termination on June 30, 2020. Consistent with the FRB’s restrictions on common-stock repurchases for large firms such as Ally, described above, we did not implement a new stock-repurchase program or repurchase shares of our common stock, except in connection with compensation plans, for the remainder of 2020. Refer to the discussion above for further details about this action. (c) On July 12, 2021, our Board declared a quarterly cash dividend of $0.25 per share on all common stock, payable on August 16, 2021, to stockholders of record at the close of business on August 2, 2021. Refer to Note 24 for further information regarding this common stock dividend.

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position	The following table summarizes the amounts of derivative instruments reported on our Condensed Consolidated Balance Sheet. The amounts are presented on a gross basis, are segregated by derivatives that are designated and qualifying as hedging instruments or those that are not, and are further segregated by type of contract within those two categories. Derivative contracts in a receivable and payable position exclude open trade equity on derivatives cleared through central clearing counterparties. Any associated margin exchanged with our central clearing counterparties are treated as settlements of the derivative exposure, rather than collateral. Such payments are recognized as settlements of the derivatives contracts in a receivable and payable position on our Condensed Consolidated Balance Sheet. Notional amounts are reference amounts from which contractual obligations are derived and are not recorded on the balance sheet. In our view, derivative notional is not an accurate measure of our derivative exposure when viewed in isolation from other factors, such as market rate fluctuations and counterparty credit risk. June 30, 2021 December 31, 2020 Derivative contracts in a Notional amount Derivative contracts in a Notional amount ($ in millions) receivable position payable position receivable position payable position Derivatives designated as accounting hedges Interest rate contracts Swaps $ — $ — $ 18,620 $ — $ — $ 12,385 Foreign exchange contracts Forwards 3 — 170 1 — 164 Total derivatives designated as accounting hedges 3 — 18,790 1 — 12,549 Derivatives not designated as accounting hedges Interest rate contracts Futures and forwards 2 — 314 1 — 391 Written options 7 — 592 15 — 587 Purchased options — — 132 — — — Total interest rate risk 9 — 1,038 16 — 978 Foreign exchange contracts Futures and forwards 1 — 162 — 1 159 Total foreign exchange risk 1 — 162 — 1 159 Credit contracts (a) Other credit derivatives — 46 n/a — 28 n/a Total credit risk — 46 n/a — 28 n/a Equity contracts Written options — 1 1 — 4 2 Purchased options 3 — 1 — — — Total equity risk 3 1 2 — 4 2 Total derivatives not designated as accounting hedges 13 47 1,202 16 33 1,139 Total derivatives $ 16 $ 47 $ 19,992 $ 17 $ 33 $ 13,688 n/a = not applicable (a) The maximum potential amount of undiscounted future payments that could be required under these credit derivatives was $84 million and $56 million as of June 30, 2021, and December 31, 2020, respectively.
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The following table presents amounts recorded on our Condensed Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges. ($ in millions) Carrying amount of the hedged items Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items Total Discontinued (a) June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 Assets Available-for-sale securities (b) (c) $ 5,380 $ 1,259 $ 9 $ 39 $ 15 $ 28 Finance receivables and loans, net (d) 36,462 28,393 124 225 61 72 Liabilities Long-term debt $ 7,189 $ 8,656 $ 102 $ 169 $ 127 $ 203 (a) Represents the fair value hedging adjustment on qualifying hedges for which the hedging relationship was discontinued. This represents a subset of the amounts reported in the total hedging adjustment. (b) The carrying amount of hedged available-for-sale securities is presented above using amortized cost and includes $3.5 billion and $592 million at June 30, 2021, and December 31, 2020, respectively, related to closed portfolios used to designate hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. Refer to Note 6 for a reconciliation of the amortized cost and fair value of available-for-sale securities. (c) The amount that is identified as the last of layer in the open hedge relationship was $2.9 billion as of June 30, 2021. The basis adjustment associated with the open last of layer relationship was a $5 million liability as of June 30, 2021, which would be allocated across the entire remaining pool upon termination or maturity of the hedge relationship. The amount that has been identified as the last of layer in the discontinued hedge relationship was $1.7 billion and $1.2 billion as of June 30, 2021, and December 31, 2020, respectively. The basis adjustment associated with the discontinued last of layer relationship was a $15 million asset as of June 30, 2021, and a $20 million asset as of December 31, 2020, which was allocated across the entire remaining pool upon termination of the hedge relationship. (d) The hedged item represents the carrying value of the hedged portfolio of assets. The amount identified as the last of layer in the open hedge relationship was $12.7 billion and $9.4 billion at June 30, 2021, and December 31, 2020, respectively. The basis adjustment associated with the open last-of-layer relationship was a $63 million asset as of June 30, 2021, and a $153 million asset as of December 31, 2020, which would be allocated across the entire remaining closed pool upon termination or maturity of the hedge relationship. The amount that is identified as the last of layer in the discontinued hedge relationship was $20.1 billion at June 30, 2021, and $18.5 billion at December 31, 2020. The basis adjustment associated with the discontinued last-of-layer hedge relationship was a $61 million asset and a $72 million asset as of June 30, 2021, and December 31, 2020, respectively, which was allocated across the entire remaining pool upon termination of the hedge relationship.
Schedule of Derivative Instruments Not Designated as Accounting Hedge	The following table summarizes the location and amounts of gains and losses on derivative instruments not designated as accounting hedges reported in our Condensed Consolidated Statement of Comprehensive Income. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 (Loss) gain recognized in earnings Interest rate contracts Loss on mortgage and automotive loans, net $ (1) $ — $ (8) $ (15) Other income, net of losses 2 (23) 2 (23) Total interest rate contracts 1 (23) (6) (38) Foreign exchange contracts Other income, net of losses — (5) — 3 Other operating expenses (2) — (4) — Total foreign exchange contracts (2) (5) (4) 3 Credit contracts Other income, net of losses (7) — (15) — Total credit contracts (7) — (15) — Total loss recognized in earnings $ (8) $ (28) $ (25) $ (35)
Schedule of Location and Amounts of Gains and Losses on Derivative Instruments	The following tables summarize the location and amounts of gains and losses on derivative instruments designated as qualifying fair value and cash flow hedges reported in our Condensed Consolidated Statement of Comprehensive Income. Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on deposits Interest on long-term debt Three months ended June 30, ($ in millions) 2021 2020 2021 2020 2021 2020 2021 2020 (Loss) gain on fair value hedging relationships Interest rate contracts Hedged fixed-rate unsecured debt $ — $ — $ — $ — $ — $ — $ (66) $ — Derivatives designated as hedging instruments on fixed-rate unsecured debt — — — — — — 66 — Hedged available-for-sale securities — — (4) 4 — — — — Derivatives designated as hedging instruments on available-for-sale securities — — 4 (4) — — — — Hedged fixed-rate consumer automotive loans (38) (23) — — — — — — Derivatives designated as hedging instruments on fixed-rate consumer automotive loans 38 23 — — — — — — Total gain on fair value hedging relationships — — — — — — — — (Loss) gain on cash flow hedging relationships Interest rate contracts Hedged deposit liabilities Reclassified from accumulated other comprehensive income into income — — — — — (2) — — Hedged variable-rate commercial loans Reclassified from accumulated other comprehensive income into income 18 22 — — — — — — Reclassified from accumulated other comprehensive income into income as a result of a forecasted transaction being probable not to occur 4 — — — — — — — Total gain (loss) on cash flow hedging relationships $ 22 $ 22 $ — $ — $ — $ (2) $ — $ — Total amounts presented in the Condensed Consolidated Statement of Comprehensive Income $ 1,588 $ 1,630 $ 147 $ 197 $ 268 $ 541 $ 230 $ 318 Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on deposits Interest on long-term debt Six months ended June 30, ($ in millions) 2021 2020 2021 2020 2021 2020 2021 2020 Gain (loss) on fair value hedging relationships Interest rate contracts Hedged fixed-rate unsecured debt $ — $ — $ — $ — $ — $ — $ 73 $ (170) Derivatives designated as hedging instruments on fixed-rate unsecured debt — — — — — — (73) 170 Hedged available-for-sale securities — — (17) 45 — — — — Derivatives designated as hedging instruments on available-for-sale securities — — 17 (45) — — — — Hedged fixed-rate consumer automotive loans (77) 225 — — — — — — Derivatives designated as hedging instruments on fixed-rate consumer automotive loans 77 (225) — — — — — — Total gain on fair value hedging relationships — — — — — — — — (Loss) gain on cash flow hedging relationships Interest rate contracts Hedged deposit liabilities Reclassified from accumulated other comprehensive income into income — — — — (1) (5) — — Hedged variable-rate commercial loans Reclassified from accumulated other comprehensive income into income 40 25 — — — — — — Reclassified from accumulated other comprehensive income into income as a result of a forecasted transaction being probable not to occur 4 — — — — — — — Total gain (loss) on cash flow hedging relationships $ 44 $ 25 $ — $ — $ (1) $ (5) $ — $ — Total amounts presented in the Condensed Consolidated Statement of Comprehensive Income $ 3,170 $ 3,372 $ 278 $ 423 $ 574 $ 1,133 $ 480 $ 666
Schedule of Derivative Instruments	The following tables summarize the location and amounts of gains and losses related to interest and amortization on derivative instruments designated as qualifying fair value and cash flow hedges reported in our Condensed Consolidated Statement of Comprehensive Income. Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on long-term debt Three months ended June 30, ($ in millions) 2021 2020 2021 2020 2021 2020 Gain (loss) on fair value hedging relationships Interest rate contracts Amortization of deferred unsecured debt basis adjustments $ — $ — $ — $ — $ 1 $ 2 Interest for qualifying accounting hedges of unsecured debt — — — — 2 — Amortization of deferred secured debt basis adjustments (FHLB advances) — — — — (3) (6) Amortization of deferred basis adjustments of available-for-sale securities — — (1) (2) — — Interest for qualifying accounting hedges of available-for-sale securities — — (3) (2) — — Amortization of deferred loan basis adjustments (11) (13) — — — — Interest for qualifying accounting hedges of consumer automotive loans held-for-investment (32) (38) — — — — Total loss on fair value hedging relationships (43) (51) (4) (4) — (4) Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on long-term debt Six months ended June 30, ($ in millions) 2021 2020 2021 2020 2021 2020 Gain (loss) on fair value hedging relationships Interest rate contracts Amortization of deferred unsecured debt basis adjustments $ — $ — $ — $ — $ 2 $ 8 Interest for qualifying accounting hedges of unsecured debt — — — — 3 — Amortization of deferred secured debt basis adjustments (FHLB advances) — — — — (8) (12) Amortization of deferred basis adjustments of available-for-sale securities — — (3) (3) — — Interest for qualifying accounting hedges of available-for-sale securities — — (4) (2) — — Amortization of deferred loan basis adjustments (24) (26) — — — — Interest for qualifying accounting hedges of consumer automotive loans held-for-investment (62) (47) — — — — Total loss on fair value hedging relationships (86) (73) (7) (5) (3) (4) Gain on cash flow hedging relationships Interest rate contracts Interest for qualifying accounting hedges of variable-rate commercial loans — 1 — — — — Total gain on cash flow hedging relationships $ — $ 1 $ — $ — $ — $ —
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table summarizes the effect of cash flow hedges on accumulated other comprehensive income. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Interest rate contracts (Loss) gain recognized in other comprehensive income $ (22) $ (19) $ (43) $ 150
Schedule of Net Investment Hedges in Accumulated Other Comprehensive Income (Loss)	The following table summarizes the effect of net investment hedges on accumulated other comprehensive income and the Condensed Consolidated Statement of Comprehensive Income. Three months ended June 30, Six months ended June 30, ($ in millions) 2021 2020 2021 2020 Foreign exchange contracts (a) (b) (Loss) gain recognized in other comprehensive income $ (3) $ (6) $ (5) $ 6 (a) There were no amounts excluded from effectiveness testing for the three months and six months ended June 30, 2021, or 2020. (b) Gains and losses reclassified from accumulated other comprehensive income are reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. There were no amounts reclassified for the three months and six months ended June 30, 2021, or 2020.

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on a Recurring Basis	The following tables display the assets and liabilities measured at fair value on a recurring basis including financial instruments elected for the fair value option. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The tables below display the hedges separately from the hedged items; therefore, they do not directly display the impact of our risk-management activities. Recurring fair value measurements June 30, 2021 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Equity securities (a) $ 1,017 $ — $ 9 $ 1,026 Available-for-sale securities Debt securities U.S. Treasury and federal agencies 2,148 — — 2,148 U.S. States and political subdivisions — 1,017 7 1,024 Foreign government 17 167 — 184 Agency mortgage-backed residential — 20,835 — 20,835 Mortgage-backed residential — 2,910 — 2,910 Agency mortgage-backed commercial — 4,405 — 4,405 Asset-backed — 555 — 555 Corporate debt — 2,100 — 2,100 Total available-for-sale securities 2,165 31,989 7 34,161 Mortgage loans held-for-sale (b) — — 97 97 Finance receivables and loans, net Consumer other (b) — — 8 8 Derivative contracts in a receivable position Interest rate — — 9 9 Foreign currency — 4 — 4 Equity contracts 3 — — 3 Total derivative contracts in a receivable position 3 4 9 16 Total assets $ 3,185 $ 31,993 $ 130 $ 35,308 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position Credit contracts $ — $ — $ 46 $ 46 Equity contracts 1 — — 1 Total derivative contracts in a payable position 1 — 46 47 Total liabilities $ 1 $ — $ 46 $ 47 (a) Our direct investment in any one industry did not exceed 11%. (b) Carried at fair value due to fair value option elections. Recurring fair value measurements December 31, 2020 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Equity securities (a) $ 1,064 $ — $ 7 $ 1,071 Available-for-sale securities Debt securities U.S. Treasury and federal agencies 803 — — 803 U.S. States and political subdivisions — 1,088 7 1,095 Foreign government 17 159 — 176 Agency mortgage-backed residential — 18,588 — 18,588 Mortgage-backed residential — 2,640 — 2,640 Agency mortgage-backed commercial — 4,189 — 4,189 Asset-backed — 425 — 425 Corporate debt — 1,914 — 1,914 Total available-for-sale securities 820 29,003 7 29,830 Mortgage loans held-for-sale (b) — — 91 91 Finance receivables and loans, net Consumer other (b) — — 8 8 Derivative contracts in a receivable position Interest rate — — 16 16 Foreign currency — 1 — 1 Total derivative contracts in a receivable position — 1 16 17 Total assets $ 1,884 $ 29,004 $ 129 $ 31,017 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position Foreign currency $ — $ 1 $ — $ 1 Credit contracts — — 28 28 Equity contracts 4 — — 4 Total derivative contracts in a payable position 4 1 28 33 Total liabilities $ 4 $ 1 $ 28 $ 33 (a) Our direct investment in any one industry did not exceed 11%. (b) Carried at fair value due to fair value option elections.
Fair Value, Assets Measured on a Recurring Basis, Unobservable Input Reconciliation	The following tables present the reconciliation for all Level 3 assets and liabilities measured at fair value on a recurring basis. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The Level 3 items presented below may be hedged by derivatives and other financial instruments that are classified as Level 1 or Level 2. Thus, the following tables do not fully reflect the impact of our risk-management activities. Equity securities (a) Available-for-sale securities Mortgage loans held-for-sale (b) (c) Finance receivables and loans, net (b) (d) Interests retained in financial asset sales ($ in millions) 2021 2020 2021 2020 2021 2020 2021 2020 2021 2020 Assets Fair value at April 1, $ 11 $ 4 $ 7 $ 3 $ 146 $ 68 $ 8 $ 10 $ — $ 1 Net realized/unrealized gains Included in earnings — 1 — — 21 8 — 1 — — Included in OCI — — — — — — — — — — Purchases — — — 2 812 676 5 3 — — Sales (2) — — — (882) (661) — — — — Issuances — — — — — — — — — — Settlements — — — — — — (5) (6) — — Transfers into (out of) Level 3 — — — — — — — — — — Fair value at June 30, $ 9 $ 5 $ 7 $ 5 $ 97 $ 91 $ 8 $ 8 $ — $ 1 Net unrealized gains still held at June 30, Included in earnings $ — $ 1 $ — $ — $ 1 $ 1 $ — $ — $ — $ — Included in OCI — — — — — — — — — — (a) Net realized/unrealized gains are reported as other gain on investments, net, in the Condensed Consolidated Statement of Comprehensive Income. (b) Carried at fair value due to fair value option elections. (c) Net realized/unrealized gains are reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income. (d) Net realized/unrealized gains are reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. Derivative liabilities, net of derivative assets ($ in millions) 2021 (a) 2020 (b) Liabilities Fair value at April 1, $ 28 $ (8) Net realized/unrealized losses (gains) Included in earnings 7 (4) Included in OCI — — Purchases — — Sales — — Issuances 2 — Settlements — — Transfers into (out of) Level 3 — — Fair value at June 30, $ 37 $ (12) Net unrealized losses (gains) still held at June 30, Included in earnings $ 10 $ (4) Included in OCI — — (a) Net realized/unrealized losses (gains) are reported as gain on mortgage and automotive loans, net, and other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. (b) Net realized/unrealized losses (gains) are reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income. Equity securities (a) Available-for-sale securities Mortgage loans held-for-sale (b) (c) Finance receivables and loans, net (b) (d) Interests retained in financial asset sales ($ in millions) 2021 2020 2021 2020 2021 2020 2021 2020 2021 2020 Assets Fair value at January 1, $ 7 $ 8 $ 7 $ 2 $ 91 $ 30 $ 8 $ 11 $ — $ 2 Net realized/unrealized gains (losses) Included in earnings 4 (3) — — 49 13 1 — — — Included in OCI — — — — — — — — — — Purchases — — — 3 1,851 978 8 9 — — Sales (2) — — — (1,894) (930) — — — — Issuances — — — — — — — — — — Settlements — — — — — — (9) (12) — (1) Transfers into (out of) Level 3 — — — — — — — — — — Fair value at June 30, $ 9 $ 5 $ 7 $ 5 $ 97 $ 91 $ 8 $ 8 $ — $ 1 Net unrealized gains (losses) still held at June 30, Included in earnings $ 4 $ (3) $ — $ — $ 1 $ 2 $ — $ — $ — $ — Included in OCI — — — — — — — — — — (a) Net realized/unrealized gains (losses) are reported as other gain on investments, net, in the Condensed Consolidated Statement of Comprehensive Income. (b) Carried at fair value due to fair value option elections. (c) Net realized/unrealized gains are reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income. (d) Net realized/unrealized gains are reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. Derivative liabilities, net of derivative assets ($ in millions) 2021 (a) 2020 (b) Liabilities Fair value at January 1, $ 12 $ (2) Net realized/unrealized losses (gains) Included in earnings 22 (10) Included in OCI — — Purchases — — Sales — — Issuances 3 — Settlements — — Transfers into (out of) Level 3 — — Fair value at June 30, $ 37 $ (12) Net unrealized losses (gains) still held at June 30, Included in earnings $ 25 $ (10) Included in OCI — — (a) Net realized/unrealized losses (gains) are reported as gain on mortgage and automotive loans, net, and other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. (b) Net realized/unrealized losses (gains) are reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income.
Fair Value Measurements - Nonrecurring Basis	The following tables display assets and liabilities measured at fair value on a nonrecurring basis and still held at June 30, 2021, and December 31, 2020, respectively. The amounts are generally as of the end of each period presented, which approximate the fair value measurements that occurred during each period. Nonrecurring fair value measurements Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments Total gain (loss) included in earnings June 30, 2021 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net $ — $ — $ 312 $ 312 $ — n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 27 27 (2) n/m (a) Other — — 59 59 (24) n/m (a) Total commercial finance receivables and loans, net — — 86 86 (26) n/m (a) Other assets Nonmarketable equity investments (c) — 171 33 204 170 n/m (a) Repossessed and foreclosed assets (d) — — 3 3 — n/m (a) Total assets $ — $ 171 $ 434 $ 605 $ 144 n/m n/m = not meaningful (a) We consider the applicable valuation allowance, loan loss allowance, or cumulative impairment to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation reserve, loan loss allowance, or cumulative adjustment. (b) Represents collateral-dependent loans held for investment for which a nonrecurring measurement was made. The related allowance for loan losses represents the cumulative fair value adjustments for those specific receivables. (c) Primarily relates to an investment in one entity for which there was a subsequent funding round resulting in an observable price change in the value of our investment in the entity. Refer to Note 10 for further discussion. (d) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value. Nonrecurring fair value measurements Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments Total gain (loss) included in earnings December 31, 2020 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net $ — $ — $ 315 $ 315 $ — n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 27 27 (5) n/m (a) Other — — 54 54 (20) n/m (a) Total commercial finance receivables and loans, net — — 81 81 (25) n/m (a) Other assets Nonmarketable equity investments (c) — 7 118 125 88 n/m (a) Repossessed and foreclosed assets (d) — — 9 9 (1) n/m (a) Total assets $ — $ 7 $ 523 $ 530 $ 62 n/m n/m = not meaningful (a) We consider the applicable valuation allowance, loan loss allowance, or cumulative impairment to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation reserve, loan loss allowance, or cumulative adjustment. (b) Represents collateral-dependent loans held for investment for which a nonrecurring measurement was made. The related allowance for loan losses represents the cumulative fair value adjustments for those specific receivables. (c) Primarily relates to an investment in one entity for which there was a subsequent funding round. This subsequent funding round resulted in an observable price change in the value of our investment in the entity. Refer to Note 13 to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K for further discussion. (d) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value.
Fair Value, by Balance Sheet Grouping	The following table presents the carrying and estimated fair value of financial instruments, except for those recorded at fair value on a recurring basis presented in the previous section of this note titled Recurring Fair Value. When possible, we use quoted market prices to determine fair value. Where quoted market prices are not available, the fair value is internally derived based on appropriate valuation methodologies with respect to the amount and timing of future cash flows and estimated discount rates. However, considerable judgment is required in interpreting current market data to develop the market assumptions and inputs necessary to estimate fair value. As such, the actual amount received to sell an asset or the amount paid to settle a liability could differ from our estimates. Fair value information presented herein was based on information available at June 30, 2021, and December 31, 2020. Estimated fair value ($ in millions) Carrying value Level 1 Level 2 Level 3 Total June 30, 2021 Financial assets Held-to-maturity securities $ 1,126 $ — $ 1,173 $ — $ 1,173 Loans held-for-sale, net 312 — — 312 312 Finance receivables and loans, net 109,083 — — 116,169 116,169 FHLB/FRB stock (a) 688 — 688 — 688 Financial liabilities Deposit liabilities $ 47,253 $ — $ — $ 47,675 $ 47,675 Long-term debt 16,896 — 14,250 5,484 19,734 December 31, 2020 Financial assets Held-to-maturity securities $ 1,253 $ — $ 1,331 $ — $ 1,331 Loans held-for-sale, net 315 — — 315 315 Finance receivables and loans, net 115,243 — — 122,156 122,156 FHLB/FRB stock (a) 725 — 725 — 725 Financial liabilities Deposit liabilities $ 55,210 $ — $ — $ 55,932 $ 55,932 Short-term borrowings 2,136 — — 2,136 2,136 Long-term debt 22,006 — 19,161 6,310 25,471 (a) Included in other assets on our Condensed Consolidated Balance Sheet.

Offsetting Assets and Liabili_2

Offsetting Assets and Liabilities (Tables)	6 Months Ended
	Jun. 30, 2021
Offsetting [Abstract]
Offsetting Assets	The composition of offsetting derivative instruments, financial assets, and financial liabilities was as follows. Gross amounts of recognized assets/liabilities Gross amounts offset on the Condensed Consolidated Balance Sheet Net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Gross amounts not offset on the Condensed Consolidated Balance Sheet ($ in millions) Financial instruments Collateral (a) (b) (c) Net amount June 30, 2021 Assets Derivative assets in net asset positions $ 7 $ — $ 7 $ (1) $ (4) $ 2 Derivative assets with no offsetting arrangements 9 — 9 — — 9 Total assets $ 16 $ — $ 16 $ (1) $ (4) $ 11 Liabilities Derivative liabilities in net asset positions $ 1 $ — $ 1 $ (1) $ — $ — Derivative liabilities with no offsetting arrangements 46 — 46 — — 46 Total liabilities $ 47 $ — $ 47 $ (1) $ — $ 46 December 31, 2020 Assets Derivative assets in net liability positions $ 1 $ — $ 1 $ (1) $ — $ — Derivative assets with no offsetting arrangements 16 — 16 — — 16 Total assets $ 17 $ — $ 17 $ (1) $ — $ 16 Liabilities Derivative liabilities in net liability positions $ 5 $ — $ 5 $ (1) $ (1) $ 3 Derivative liabilities with no offsetting arrangements 28 — 28 — — 28 Total liabilities $ 33 $ — $ 33 $ (1) $ (1) $ 31 (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. We do not record such collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. We have not sold or pledged any of the noncash collateral received under these agreements.
Offsetting Liabilities	The composition of offsetting derivative instruments, financial assets, and financial liabilities was as follows. Gross amounts of recognized assets/liabilities Gross amounts offset on the Condensed Consolidated Balance Sheet Net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Gross amounts not offset on the Condensed Consolidated Balance Sheet ($ in millions) Financial instruments Collateral (a) (b) (c) Net amount June 30, 2021 Assets Derivative assets in net asset positions $ 7 $ — $ 7 $ (1) $ (4) $ 2 Derivative assets with no offsetting arrangements 9 — 9 — — 9 Total assets $ 16 $ — $ 16 $ (1) $ (4) $ 11 Liabilities Derivative liabilities in net asset positions $ 1 $ — $ 1 $ (1) $ — $ — Derivative liabilities with no offsetting arrangements 46 — 46 — — 46 Total liabilities $ 47 $ — $ 47 $ (1) $ — $ 46 December 31, 2020 Assets Derivative assets in net liability positions $ 1 $ — $ 1 $ (1) $ — $ — Derivative assets with no offsetting arrangements 16 — 16 — — 16 Total assets $ 17 $ — $ 17 $ (1) $ — $ 16 Liabilities Derivative liabilities in net liability positions $ 5 $ — $ 5 $ (1) $ (1) $ 3 Derivative liabilities with no offsetting arrangements 28 — 28 — — 28 Total liabilities $ 33 $ — $ 33 $ (1) $ (1) $ 31 (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. We do not record such collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. We have not sold or pledged any of the noncash collateral received under these agreements.

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Financial information for our reportable operating segments is summarized as follows. Three months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2021 Net financing revenue and other interest income $ 1,333 $ 15 $ 23 $ 77 $ 99 $ 1,547 Other revenue 61 344 22 33 78 538 Total net revenue 1,394 359 45 110 177 2,085 Provision for credit losses (23) — — (13) 4 (32) Total noninterest expense 500 272 45 28 230 1,075 Income (loss) from continuing operations before income tax expense $ 917 $ 87 $ — $ 95 $ (57) $ 1,042 Total assets $ 100,162 $ 9,394 $ 13,865 $ 6,246 $ 50,803 $ 180,470 2020 Net financing revenue and other interest income $ 989 $ 12 $ 30 $ 77 $ (54) $ 1,054 Other revenue 40 438 19 6 52 555 Total net revenue 1,029 450 49 83 (2) 1,609 Provision for credit losses 256 — 3 25 3 287 Total noninterest expense 444 322 38 26 155 985 Income (loss) from continuing operations before income tax expense $ 329 $ 128 $ 8 $ 32 $ (160) $ 337 Total assets $ 102,016 $ 8,740 $ 16,669 $ 6,206 $ 50,430 $ 184,061 (a) Net financing revenue and other interest income after the provision for credit losses totaled $1.6 billion and $767 million for the three months ended June 30, 2021, and June 30, 2020, respectively. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2021 Net financing revenue and other interest income $ 2,539 $ 30 $ 46 $ 148 $ 156 $ 2,919 Other revenue 123 723 62 59 136 1,103 Total net revenue 2,662 753 108 207 292 4,022 Provision for credit losses (45) — (4) — 4 (45) Total noninterest expense 987 525 89 59 358 2,018 Income (loss) from continuing operations before income tax expense $ 1,720 $ 228 $ 23 $ 148 $ (70) $ 2,049 Total assets $ 100,162 $ 9,394 $ 13,865 $ 6,246 $ 50,803 $ 180,470 2020 Net financing revenue and other interest income $ 2,029 $ 26 $ 68 $ 145 $ (68) $ 2,200 Other revenue 87 575 29 19 111 821 Total net revenue 2,116 601 97 164 43 3,021 Provision for credit losses 1,022 — 4 139 25 1,190 Total noninterest expense 938 578 73 61 255 1,905 Income (loss) from continuing operations before income tax expense $ 156 $ 23 $ 20 $ (36) $ (237) $ (74) Total assets $ 102,016 $ 8,740 $ 16,669 $ 6,206 $ 50,430 $ 184,061 (a) Net financing revenue and other interest income after the provision for credit losses totaled $3.0 billion and $1.0 billion for the six months ended June 30, 2021, and June 30, 2020, respectively.

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 215	$ 179	$ 433	$ 365
All other revenue	323	376	670	456
Total other revenue	538	555	1,103	821
Remarketing gains (losses), net	128	(11)	192	(9)
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	20	15	46	32
All other revenue	58	37	90	79
Total other revenue	78	52	136	111
Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	33	18	66	40
All other revenue	28	22	57	47
Total other revenue	61	40	123	87
Remarketing gains (losses), net	128	(11)	192	(9)
Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	162	146	321	293
All other revenue	182	292	402	282
Total other revenue	344	438	723	575
Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
All other revenue	22	19	62	29
Total other revenue	22	19	62	29
Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
All other revenue	33	6	59	19
Total other revenue	33	6	59	19
Noninsurance contracts
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	158	142	313	285
Noninsurance contracts | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Noninsurance contracts | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Noninsurance contracts | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	158	142	313	285
Unearned revenue, remaining performance obligation, amount	3,100	2,900	3,100	2,900	$ 3,000	$ 3,000	$ 2,900	$ 2,900
Unearned revenue, revenue recognized	228	211	453	425
Capitalized contract cost, net	1,900	1,800	1,900	1,800	$ 1,800	$ 1,800	$ 1,700	$ 1,700
Capitalized contract cost, amortization	133	121	265	246
Noninsurance contracts | Insurance operations | Operating Segments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	$ 423		$ 423
Remaining performance obligation, expected timing of satisfaction, period	6 months		6 months
Noninsurance contracts | Insurance operations | Operating Segments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	$ 789		$ 789
Remaining performance obligation, expected timing of satisfaction, period	1 year		1 year
Noninsurance contracts | Insurance operations | Operating Segments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	$ 700		$ 700
Remaining performance obligation, expected timing of satisfaction, period	1 year		1 year
Noninsurance contracts | Insurance operations | Operating Segments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	$ 531		$ 531
Remaining performance obligation, expected timing of satisfaction, period	1 year		1 year
Noninsurance contracts | Insurance operations | Operating Segments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	$ 628		$ 628
Remaining performance obligation, expected timing of satisfaction, period
Noninsurance contracts | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	0	$ 0	0
Noninsurance contracts | Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Remarketing fee income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	27	15	54	32
Remarketing fee income | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Remarketing fee income | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	27	15	54	32
Remarketing fee income | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Remarketing fee income | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Remarketing fee income | Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokerage commissions and other revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	13	14	33	27
Brokerage commissions and other revenue | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	13	14	33	27
Brokerage commissions and other revenue | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokerage commissions and other revenue | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokerage commissions and other revenue | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokerage commissions and other revenue | Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Deposit account and other banking fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5	1	11	5
Deposit account and other banking fees | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5	1	11	5
Deposit account and other banking fees | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Deposit account and other banking fees | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Deposit account and other banking fees | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Deposit account and other banking fees | Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokered/agent commissions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4	4	8	8
Brokered/agent commissions | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokered/agent commissions | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokered/agent commissions | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4	4	8	8
Brokered/agent commissions | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokered/agent commissions | Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8	3	14	8
Other | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	0	2	0
Other | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6	3	12	8
Other | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other | Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0	$ 0	$ 0

Other Income, Net of Losses (Sc

Other Income, Net of Losses (Schedule of Other Income, Net of Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Nonoperating Income (Expense) [Abstract]
Gain (loss) on nonmarketable equity investments, net	$ 99	$ (4)	$ 103	$ (4)
Late charges and other administrative fees	29	16	60	37
Remarketing fees	27	15	54	32
Income from equity-method investments	31	53	45	52
Other, net	63	11	114	54
Total other income, net of losses	$ 249	$ 91	$ 376	$ 171

Reserves for Insurance Losses_3

Reserves for Insurance Losses and Loss Adjustment Expenses (Rollforward of Reserves for Insurance Losses and Loss Adjustment Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves for insurance losses and loss adjustment expenses, beginning balance			$ 129	$ 122
Reinsurance recoverable			90	88
Net reserves for insurance losses and loss adjustment expenses, beginning balance			39	34
Net insurance losses and loss adjustment expenses, current year			136	215
Net insurance losses and loss adjustment expenses, prior years			1	1
Total net insurance losses and loss adjustment expenses incurred	$ 74	$ 142	137	216
Net insurance losses and loss adjustment expenses paid or payable, current year			(108)	(178)
Net insurance losses and loss adjustment expenses paid or payable, prior years			(27)	(26)
Total net insurance losses and loss adjustment expenses paid or payable			(135)	(204)
Net reserves for insurance losses and loss adjustment expenses, ending balance	41	46	41	46
Reinsurance recoverable	85	86	85	86
Gross reserves for insurance losses and loss adjustment expenses, ending balance	$ 126	$ 132	$ 126	$ 132

Other Operating Expenses (Sched

Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating Expenses [Abstract]
Insurance commissions	$ 138	$ 127	$ 274	$ 253
Technology and communications	81	80	159	159
Lease and loan administration	57	46	112	84
Advertising and marketing	45	32	86	76
Property and equipment depreciation	38	34	74	68
Professional services	28	28	61	59
Charitable contributions	54	3	55	4
Vehicle remarketing and repossession	17	11	38	34
Regulatory and licensing fees	17	29	35	58
Occupancy	18	13	33	29
Non-income taxes	9	7	15	14
Amortization of intangible assets	4	5	9	10
Other	49	44	89	97
Total other operating expenses	$ 555	$ 459	$ 1,040	$ 945

Investment Securities (Investme

Investment Securities (Investment Portfolio) (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Available-for-sale securities
Debt securities, available-for-sale, fair value	[1]	$ 34,161	$ 29,830
Held-to-maturity securities
Debt securities, held-to-maturity, amortized cost		1,126	1,253
Available-for-sale securities
Held-to-maturity securities
Securities pledged for Federal Home Loan Bank, at fair value		151	145
Operating Segments | Insurance operations | Available-for-sale securities
Held-to-maturity securities
Deposit securities		13	13
Available-for-sale debt securities | Available-for-sale securities
Available-for-sale securities
Debt securities, available-for-sale, amortized cost		33,781	28,936
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax		596	915
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax		(216)	(21)
Debt securities, available-for-sale, fair value		34,161	29,830
Held-to-maturity securities
Accrued interest receivable		90	90
U.S. Treasury and federal agencies | Available-for-sale securities
Available-for-sale securities
Debt securities, available-for-sale, amortized cost		2,153	783
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax		12	20
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax		(17)	0
Debt securities, available-for-sale, fair value		2,148	803
U.S. States and political subdivisions | Available-for-sale securities
Available-for-sale securities
Debt securities, available-for-sale, amortized cost		989	1,046
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax		37	50
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax		(2)	(1)
Debt securities, available-for-sale, fair value		1,024	1,095
Foreign government | Available-for-sale securities
Available-for-sale securities
Debt securities, available-for-sale, amortized cost		181	167
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax		4	9
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax		(1)	0
Debt securities, available-for-sale, fair value		184	176
Agency mortgage-backed residential
Held-to-maturity securities
Debt securities, held-to-maturity, amortized cost		1,126	1,253
Agency mortgage-backed residential | Available-for-sale securities
Available-for-sale securities
Debt securities, available-for-sale, amortized cost		20,615	18,053
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax		343	538
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax		(123)	(3)
Debt securities, available-for-sale, fair value		20,835	18,588
Agency mortgage-backed residential | Held-to-maturity securities
Held-to-maturity securities
Debt securities, held-to-maturity, amortized cost		1,126	1,253
Debt securities, held-to-maturity, unrecognized gain		57	79
Debt securities, held-to-maturity, unrecognized loss		(10)	(1)
Held-to-maturity securities, fair value		1,173	1,331
Mortgage-backed residential | Available-for-sale securities
Available-for-sale securities
Debt securities, available-for-sale, amortized cost		2,890	2,595
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax		25	49
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax		(5)	(4)
Debt securities, available-for-sale, fair value		2,910	2,640
Agency mortgage-backed commercial | Available-for-sale securities
Available-for-sale securities
Debt securities, available-for-sale, amortized cost		4,355	4,063
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax		109	139
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax		(59)	(13)
Debt securities, available-for-sale, fair value		4,405	4,189
Asset-backed | Available-for-sale securities
Available-for-sale securities
Debt securities, available-for-sale, amortized cost		552	420
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax		3	5
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax		0	0
Debt securities, available-for-sale, fair value		555	425
Corporate debt | Available-for-sale securities
Available-for-sale securities
Debt securities, available-for-sale, amortized cost		2,046	1,809
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax		63	105
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax		(9)	0
Debt securities, available-for-sale, fair value		2,100	1,914
Held-to-maturity securities
Held-to-maturity securities
Debt securities, held-to-maturity, amortized cost		1,126	1,253
Debt securities, held-to-maturity, unrecognized gain		57	79
Debt securities, held-to-maturity, unrecognized loss		(10)	(1)
Held-to-maturity securities, fair value		1,173	1,331
Accrued interest receivable		3	3
Held-to-maturity securities | Held-to-maturity securities
Held-to-maturity securities
Held-to-maturity securities, fair value		$ 1,173	$ 1,331
[1]	Refer to Note 6 for discussion of investment securities pledged as collateral.

Investment Securities (Invest_2

Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Available-for-sale securities
Total available-for-sale debt securities	[1]	$ 34,161	$ 29,830
Held-to-maturity securities
Cash equivalents		42	25
Held-to-maturity securities
Held-to-maturity securities
Debt securities, held-to-maturity, amortized cost, amount		$ 1,126	$ 1,253
Debt securities, held-to-maturity, yield		2.90%	3.00%
Debt securities, held-to-maturity, maturity, within one year, amortized cost		$ 0	$ 0
Debt securities, held-to-maturity, due in one year or less, yield		0.00%	0.00%
Debt securities, held-to-maturity, maturity, one through five years, amortized cost		$ 0	$ 0
Debt securities, held-to-maturity, due after one year through five years, yield		0.00%	0.00%
Debt securities, held-to-maturity, maturity, after five through ten years, amortized cost		$ 0	$ 0
Debt securities, held-to-maturity, due after five years through ten years, yield		0.00%	0.00%
Debt securities, held-to-maturity, maturity, after ten years, amortized cost		$ 1,126	$ 1,253
Debt securities, held-to-maturity, due after ten years, yield		2.90%	3.00%
Available-for-sale securities | Available-for-sale debt securities
Available-for-sale securities
Total available-for-sale debt securities		$ 34,161	$ 29,830
Debt securities, available-for-sale, yield		2.40%	2.80%
Debt securities, available-for-sale, due in one year or less		$ 179	$ 226
Debt securities, available-for-sale, due in one year or less, yield		2.50%	2.30%
Debt securities, available-for-sale, due after one year through five years		$ 1,917	$ 1,871
Debt securities, available-for-sale, due after one year through five years, yield		2.00%	2.20%
Debt securities, available-for-sale, due after five years through ten years		$ 5,056	$ 3,218
Debt securities, available-for-sale, due after five years through ten years, yield		1.90%	2.40%
Debt securities, available-for-sale, due after ten years		$ 27,009	$ 24,515
Debt securities, available-for-sale, due after ten years, yield		2.50%	3.00%
Debt securities, available-for-sale, amortized cost		$ 33,781	$ 28,936
Debt securities, available-for-sale, maturity, within one year, amortized cost		178	224
Debt securities, available-for-sale, maturity, after one through five years, amortized cost		1,874	1,808
Debt securities, available-for-sale, maturity, after five through ten years, amortized cost		4,945	3,022
Debt securities, available-for-sale, maturity, after ten years, amortized cost		26,784	23,882
Available-for-sale securities | U.S. Treasury and federal agencies
Available-for-sale securities
Total available-for-sale debt securities		$ 2,148	$ 803
Debt securities, available-for-sale, yield		1.10%	1.20%
Debt securities, available-for-sale, due in one year or less		$ 12	$ 13
Debt securities, available-for-sale, due in one year or less, yield		1.60%	0.10%
Debt securities, available-for-sale, due after one year through five years		$ 510	$ 708
Debt securities, available-for-sale, due after one year through five years, yield		0.90%	1.10%
Debt securities, available-for-sale, due after five years through ten years		$ 1,626	$ 82
Debt securities, available-for-sale, due after five years through ten years, yield		1.20%	1.70%
Debt securities, available-for-sale, due after ten years		$ 0	$ 0
Debt securities, available-for-sale, due after ten years, yield		0.00%	0.00%
Debt securities, available-for-sale, amortized cost		$ 2,153	$ 783
Available-for-sale securities | U.S. States and political subdivisions
Available-for-sale securities
Total available-for-sale debt securities		$ 1,024	$ 1,095
Debt securities, available-for-sale, yield		3.00%	3.00%
Debt securities, available-for-sale, due in one year or less		$ 51	$ 49
Debt securities, available-for-sale, due in one year or less, yield		2.50%	1.40%
Debt securities, available-for-sale, due after one year through five years		$ 102	$ 103
Debt securities, available-for-sale, due after one year through five years, yield		2.40%	2.30%
Debt securities, available-for-sale, due after five years through ten years		$ 212	$ 228
Debt securities, available-for-sale, due after five years through ten years, yield		2.70%	2.70%
Debt securities, available-for-sale, due after ten years		$ 659	$ 715
Debt securities, available-for-sale, due after ten years, yield		3.20%	3.30%
Debt securities, available-for-sale, amortized cost		$ 989	$ 1,046
Available-for-sale securities | Foreign government
Available-for-sale securities
Total available-for-sale debt securities		$ 184	$ 176
Debt securities, available-for-sale, yield		1.90%	2.10%
Debt securities, available-for-sale, due in one year or less		$ 13	$ 9
Debt securities, available-for-sale, due in one year or less, yield		2.10%	1.70%
Debt securities, available-for-sale, due after one year through five years		$ 106	$ 86
Debt securities, available-for-sale, due after one year through five years, yield		2.00%	2.30%
Debt securities, available-for-sale, due after five years through ten years		$ 65	$ 81
Debt securities, available-for-sale, due after five years through ten years, yield		1.80%	1.90%
Debt securities, available-for-sale, due after ten years		$ 0	$ 0
Debt securities, available-for-sale, due after ten years, yield		0.00%	0.00%
Debt securities, available-for-sale, amortized cost		$ 181	$ 167
Available-for-sale securities | Agency mortgage-backed residential
Available-for-sale securities
Total available-for-sale debt securities		$ 20,835	$ 18,588
Debt securities, available-for-sale, yield		2.60%	3.10%
Debt securities, available-for-sale, due in one year or less		$ 0	$ 0
Debt securities, available-for-sale, due in one year or less, yield		0.00%	0.00%
Debt securities, available-for-sale, due after one year through five years		$ 0	$ 0
Debt securities, available-for-sale, due after one year through five years, yield		0.00%	0.00%
Debt securities, available-for-sale, due after five years through ten years		$ 31	$ 37
Debt securities, available-for-sale, due after five years through ten years, yield		2.00%	2.00%
Debt securities, available-for-sale, due after ten years		$ 20,804	$ 18,551
Debt securities, available-for-sale, due after ten years, yield		2.60%	3.10%
Debt securities, available-for-sale, amortized cost		$ 20,615	$ 18,053
Available-for-sale securities | Mortgage-backed residential
Available-for-sale securities
Total available-for-sale debt securities		$ 2,910	$ 2,640
Debt securities, available-for-sale, yield		2.80%	3.10%
Debt securities, available-for-sale, due in one year or less		$ 0	$ 0
Debt securities, available-for-sale, due in one year or less, yield		0.00%	0.00%
Debt securities, available-for-sale, due after one year through five years		$ 0	$ 0
Debt securities, available-for-sale, due after one year through five years, yield		0.00%	0.00%
Debt securities, available-for-sale, due after five years through ten years		$ 28	$ 36
Debt securities, available-for-sale, due after five years through ten years, yield		2.90%	2.90%
Debt securities, available-for-sale, due after ten years		$ 2,882	$ 2,604
Debt securities, available-for-sale, due after ten years, yield		2.80%	3.10%
Debt securities, available-for-sale, amortized cost		$ 2,890	$ 2,595
Available-for-sale securities | Agency mortgage-backed commercial
Available-for-sale securities
Total available-for-sale debt securities		$ 4,405	$ 4,189
Debt securities, available-for-sale, yield		1.90%	1.90%
Debt securities, available-for-sale, due in one year or less		$ 0	$ 0
Debt securities, available-for-sale, due in one year or less, yield		0.00%	0.00%
Debt securities, available-for-sale, due after one year through five years		$ 0	$ 0
Debt securities, available-for-sale, due after one year through five years, yield		0.00%	0.00%
Debt securities, available-for-sale, due after five years through ten years		$ 1,753	$ 1,628
Debt securities, available-for-sale, due after five years through ten years, yield		2.30%	2.30%
Debt securities, available-for-sale, due after ten years		$ 2,652	$ 2,561
Debt securities, available-for-sale, due after ten years, yield		1.70%	1.70%
Debt securities, available-for-sale, amortized cost		$ 4,355	$ 4,063
Available-for-sale securities | Asset-backed
Available-for-sale securities
Total available-for-sale debt securities		$ 555	$ 425
Debt securities, available-for-sale, yield		2.10%	2.90%
Debt securities, available-for-sale, due in one year or less		$ 0	$ 0
Debt securities, available-for-sale, due in one year or less, yield		0.00%	0.00%
Debt securities, available-for-sale, due after one year through five years		$ 350	$ 349
Debt securities, available-for-sale, due after one year through five years, yield		2.50%	3.00%
Debt securities, available-for-sale, due after five years through ten years		$ 194	$ 49
Debt securities, available-for-sale, due after five years through ten years, yield		1.40%	1.80%
Debt securities, available-for-sale, due after ten years		$ 11	$ 27
Debt securities, available-for-sale, due after ten years, yield		3.20%	3.10%
Debt securities, available-for-sale, amortized cost		$ 552	$ 420
Available-for-sale securities | Corporate debt
Available-for-sale securities
Total available-for-sale debt securities		$ 2,100	$ 1,914
Debt securities, available-for-sale, yield		2.40%	2.70%
Debt securities, available-for-sale, due in one year or less		$ 103	$ 155
Debt securities, available-for-sale, due in one year or less, yield		2.70%	2.70%
Debt securities, available-for-sale, due after one year through five years		$ 849	$ 625
Debt securities, available-for-sale, due after one year through five years, yield		2.40%	2.90%
Debt securities, available-for-sale, due after five years through ten years		$ 1,147	$ 1,077
Debt securities, available-for-sale, due after five years through ten years, yield		2.40%	2.60%
Debt securities, available-for-sale, due after ten years		$ 1	$ 57
Debt securities, available-for-sale, due after ten years, yield		1.70%	2.10%
Debt securities, available-for-sale, amortized cost		$ 2,046	$ 1,809
Held-to-maturity securities | Agency mortgage-backed residential
Held-to-maturity securities
Debt securities, held-to-maturity, amortized cost, amount		$ 1,126	$ 1,253
Debt securities, held-to-maturity, yield		2.90%	3.00%
Debt securities, held-to-maturity, maturity, within one year, amortized cost		$ 0	$ 0
Debt securities, held-to-maturity, due in one year or less, yield		0.00%	0.00%
Debt securities, held-to-maturity, maturity, one through five years, amortized cost		$ 0	$ 0
Debt securities, held-to-maturity, due after one year through five years, yield		0.00%	0.00%
Debt securities, held-to-maturity, maturity, after five through ten years, amortized cost		$ 0	$ 0
Debt securities, held-to-maturity, due after five years through ten years, yield		0.00%	0.00%
Debt securities, held-to-maturity, maturity, after ten years, amortized cost		$ 1,126	$ 1,253
Debt securities, held-to-maturity, due after ten years, yield		2.90%	3.00%
[1]	Refer to Note 6 for discussion of investment securities pledged as collateral.

Investment Securities (Invest_3

Investment Securities (Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest and dividends on investment securities	$ 147	$ 197	$ 278	$ 423
Excludes other earning assets
Taxable interest	131	177	245	382
Taxable dividends	7	5	12	10
Interest and dividends exempt from U.S. federal income tax	5	5	10	8
Interest and dividends on investment securities	$ 143	$ 187	$ 267	$ 400

Investment Securities (Schedule

Investment Securities (Schedule Of Realized Gain (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Available-for-sale securities, gross realized gains	$ 6	$ 19	$ 38	$ 124
Net realized gains on available-for-sale securities	6	19	38	124
Net realized gain on equity securities	40	80	114	81
Net unrealized gain (loss) on equity securities	19	89	36	(96)
Other gain on investments, net	$ 65	$ 188	$ 188	$ 109

Investment securities (Invest_4

Investment securities (Investments Classified by Credit Rating) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 1,126	$ 1,253
Agency mortgage-backed residential
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	1,126	1,253
AA Rating
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	1,126	1,253
AA Rating | Agency mortgage-backed residential
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 1,126	$ 1,253

Investment Securities (Schedu_2

Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	$ 14,141	$ 2,630
Debt securities, available-for-sale, unrealized loss, less than 12 months	(216)	(21)
Debt securities, available-for-sale, fair value, 12 months or longer	5	5
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	0
U.S. Treasury and federal agencies
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	871	3
Debt securities, available-for-sale, unrealized loss, less than 12 months	(17)	0
Debt securities, available-for-sale, fair value, 12 months or longer	0	0
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	0
U.S. States and political subdivisions
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	121	83
Debt securities, available-for-sale, unrealized loss, less than 12 months	(2)	(1)
Debt securities, available-for-sale, fair value, 12 months or longer	0	0
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	0
Foreign government
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	57	7
Debt securities, available-for-sale, unrealized loss, less than 12 months	(1)	0
Debt securities, available-for-sale, fair value, 12 months or longer	0	0
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	0
Agency mortgage-backed residential
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	8,530	1,225
Debt securities, available-for-sale, unrealized loss, less than 12 months	(123)	(3)
Debt securities, available-for-sale, fair value, 12 months or longer	0	0
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	0
Mortgage-backed residential
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	1,109	316
Debt securities, available-for-sale, unrealized loss, less than 12 months	(5)	(4)
Debt securities, available-for-sale, fair value, 12 months or longer	4	0
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	0
Agency mortgage-backed commercial
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	2,764	926
Debt securities, available-for-sale, unrealized loss, less than 12 months	(59)	(13)
Debt securities, available-for-sale, fair value, 12 months or longer	0	0
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	0
Asset-backed
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	103	11
Debt securities, available-for-sale, unrealized loss, less than 12 months	0	0
Debt securities, available-for-sale, fair value, 12 months or longer	0	0
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	0
Corporate debt
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	586	59
Debt securities, available-for-sale, unrealized loss, less than 12 months	(9)	0
Debt securities, available-for-sale, fair value, 12 months or longer	1	5
Debt securities, available-for-sale, unrealized loss, 12 months or longer	$ 0	$ 0

Finance Receivables and Loans_3

Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 112,217		$ 118,534
Unamortized premiums and discounts and deferred fees and costs	2,200		2,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	90,649		89,202
Consumer | Consumer automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	75,951		73,668
Consumer | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	14,058		15,127
Consumer | Mortgage Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	13,629		14,632
Interest-only mortgage loans	6		8
Consumer | Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	429		495
Interest-only mortgage loans	$ 25		30
Interest-only mortgage loans having exited the interest-only period	99.00%
Consumer | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 640		407
Finance receivables, fair value	8	$ 8	8	$ 8	$ 10	$ 11
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	21,568		29,332
Commercial | Consumer automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	11,303		19,082
Commercial | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	4,823		5,008
Commercial | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	5,442		5,242
Finance receivables and loans, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	$ 475		$ 587

Finance Receivables and Loans_4

Finance Receivables and Loans, Net (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance	$ 3,152	$ 3,245	$ 3,283	$ 1,263
Charge-offs	(197)	(291)	(505)	(675)
Recoveries	203	113	393	231
Net charge-offs	6	(178)	(112)	(444)
Provision for credit losses	(32)	287	(45)	1,190
Other	0	0	0	(1)
Allowance, ending balance	3,126	3,354	3,126	3,354
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance				1,346
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance				2,609
Consumer | Consumer automotive
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance	2,809	2,833	2,902	1,075
Charge-offs	(183)	(245)	(467)	(618)
Recoveries	188	108	375	219
Net charge-offs	5	(137)	(92)	(399)
Provision for credit losses	(12)	269	(8)	954
Other	0	(2)	0	(1)
Allowance, ending balance	2,802	2,963	2,802	2,963
Consumer | Consumer automotive | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance				1,334
Consumer | Consumer automotive | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance				2,409
Consumer | Consumer mortgage
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance	26	39	33	46
Charge-offs	(2)	(2)	(4)	(5)
Recoveries	3	4	6	9
Net charge-offs	1	2	2	4
Provision for credit losses	(4)	1	(11)	(2)
Other	1	0	0	0
Allowance, ending balance	24	42	24	42
Consumer | Consumer mortgage | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance				(6)
Consumer | Consumer mortgage | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance				40
Consumer | Consumer other
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance	69	45	73	9
Charge-offs	(5)	(4)	(13)	(9)
Recoveries	1	0	1	1
Net charge-offs	(4)	(4)	(12)	(8)
Provision for credit losses	8	6	11	31
Other	(1)	2	0	1
Allowance, ending balance	72	49	72	49
Consumer | Consumer other | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance				16
Consumer | Consumer other | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance				25
Commercial
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance	248	328	275	133
Charge-offs	(7)	(40)	(21)	(43)
Recoveries	11	1	11	2
Net charge-offs	4	(39)	(10)	(41)
Provision for credit losses	(24)	11	(37)	207
Other	0	0	0	(1)
Allowance, ending balance	$ 228	$ 300	$ 228	300
Commercial | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance				2
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance, beginning balance				$ 135

Finance Receivables and Loans_5

Finance Receivables and Loans, Net (Schedule of Sales of Financing Receivables and Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Sale	$ 84	$ 0	$ 413	$ 0
Consumer | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Sale	$ 84	$ 0	$ 413	$ 0

Finance Receivables and Loans_6

Finance Receivables and Loans, Net (Schedule of Purchases of Financing Receivables and Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	$ 2,471	$ 2,506	$ 3,236	$ 3,350
Consumer | Consumer automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	727	635	1,304	995
Consumer | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	1,744	1,870	1,932	2,354
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	$ 0	$ 1	$ 0	$ 1

Finance Receivables and Loans_7

Finance Receivables and Loans, Net (Schedule of Financing Receivables, Nonaccrual Status) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	$ 1,283		$ 1,283		$ 1,439	$ 1,522	$ 1,396	$ 1,036
Financing receivable, nonaccrual, with no allowance	584		584			706
Financing receivable, nonaccrual, interest income	3	$ 4	5	$ 6
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	1,111		1,111		1,270	1,361	1,140	821
Financing receivable, nonaccrual, with no allowance	523		523			650
Consumer | Consumer automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	1,033		1,033		1,173	1,256	1,077	762
Financing receivable, nonaccrual, with no allowance	472		472			604
Consumer | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	76		76		95	102	62	57
Financing receivable, nonaccrual, with no allowance	51		51			46
Consumer | Mortgage Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	49		49		63	67	22	17
Financing receivable, nonaccrual, with no allowance	26		26			18
Consumer | Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	27		27		32	35	40	40
Financing receivable, nonaccrual, with no allowance	25		25			28
Consumer | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	2		2		2	3	1	2
Financing receivable, nonaccrual, with no allowance	0		0			0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	172		172		169	161	256	215
Financing receivable, nonaccrual, with no allowance	61		61			56
Commercial | Consumer automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	33		33		17	40	86	73
Financing receivable, nonaccrual, with no allowance	4		4			10
Commercial | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	6		6		2	5	8	4
Financing receivable, nonaccrual, with no allowance	6		6			5
Commercial | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	133		133		$ 150	116	$ 162	$ 138
Financing receivable, nonaccrual, with no allowance	$ 51		$ 51			$ 41

Finance Receivables and Loans_8

Finance Receivables and Loans, Net (Financing Receivable Credit Quality Indicators Consumer) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	$ 112,217		$ 118,534
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	90,649		89,202
Consumer | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	23,430		31,399
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	25,611		22,426
Financing Receivable, Originated Two Years before Latest Fiscal Year	17,166		14,509
Financing Receivable, Originated Three Years before Latest Fiscal Year	10,675		9,765
Financing Receivable, Originated Four Years before Latest Fiscal Year	6,734		5,143
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,714		5,604
Financing Receivable, Revolving	280		310
Revolving loans converted to term	31		38
Total finance receivables and loans	90,641		89,194
Consumer | Consumer automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	19,274		27,634
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	22,530		19,943
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,696		12,730
Financing Receivable, Originated Three Years before Latest Fiscal Year	9,594		7,483
Financing Receivable, Originated Four Years before Latest Fiscal Year	5,303		3,953
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,554		1,925
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	75,951		73,668
Consumer | Consumer mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3,776		3,444
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,871		2,425
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,438		1,765
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,073		2,277
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,429		1,189
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,160		3,679
Financing Receivable, Revolving	280		310
Revolving loans converted to term	31		38
Total finance receivables and loans	14,058		15,127
Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3,776		3,444
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,871		2,425
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,438		1,765
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,073		2,277
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,429		1,189
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,042		3,532
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	13,629		14,632
Consumer | Mortgage - Legacy
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	118		147
Financing Receivable, Revolving	280		310
Revolving loans converted to term	31		38
Total finance receivables and loans	429		495
Consumer | Consumer other
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	640		407
Finance receivables, fair value	8	$ 8	8	$ 8	$ 10	$ 11
Consumer | Consumer other | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	380		321
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	210		58
Financing Receivable, Originated Two Years before Latest Fiscal Year	32		14
Financing Receivable, Originated Three Years before Latest Fiscal Year	8		5
Financing Receivable, Originated Four Years before Latest Fiscal Year	2		1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	632		399
Current period | Consumer | Consumer automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	19,187		27,255
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	22,144		19,204
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,212		12,129
Financing Receivable, Originated Three Years before Latest Fiscal Year	9,239		7,060
Financing Receivable, Originated Four Years before Latest Fiscal Year	5,073		3,678
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,344		1,766
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	74,199		71,092
Current period | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3,754		3,432
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,862		2,410
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,430		1,744
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,059		2,254
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,420		1,177
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,002		3,492
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	13,527		14,509
Current period | Consumer | Mortgage - Legacy
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	98		121
Financing Receivable, Revolving	274		303
Revolving loans converted to term	30		36
Total finance receivables and loans	402		460
Current period | Consumer | Consumer other | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	376		306
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	205		53
Financing Receivable, Originated Two Years before Latest Fiscal Year	31		13
Financing Receivable, Originated Three Years before Latest Fiscal Year	8		4
Financing Receivable, Originated Four Years before Latest Fiscal Year	2		1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	622		377
Financing receivables, 30 to 59 days past due | Consumer | Consumer automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	69		281
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	280		466
Financing Receivable, Originated Two Years before Latest Fiscal Year	332		376
Financing Receivable, Originated Three Years before Latest Fiscal Year	244		264
Financing Receivable, Originated Four Years before Latest Fiscal Year	157		174
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	139		97
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	1,221		1,658
Financing receivables, 30 to 59 days past due | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	22		10
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8		9
Financing Receivable, Originated Two Years before Latest Fiscal Year	5		10
Financing Receivable, Originated Three Years before Latest Fiscal Year	3		11
Financing Receivable, Originated Four Years before Latest Fiscal Year	5		7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	17		16
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	60		63
Financing receivables, 30 to 59 days past due | Consumer | Mortgage - Legacy
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2		4
Financing Receivable, Revolving	2		2
Revolving loans converted to term	0		0
Total finance receivables and loans	4		6
Financing receivables, 30 to 59 days past due | Consumer | Consumer other | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2		9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2		3
Financing Receivable, Originated Two Years before Latest Fiscal Year	1		1
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	5		13
Financing receivables, 60 to 89 days past due | Consumer | Consumer automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	14		66
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	71		165
Financing Receivable, Originated Two Years before Latest Fiscal Year	94		129
Financing Receivable, Originated Three Years before Latest Fiscal Year	66		88
Financing Receivable, Originated Four Years before Latest Fiscal Year	40		55
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	33		32
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	318		535
Financing receivables, 60 to 89 days past due | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0		1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		1
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		3
Financing Receivable, Originated Three Years before Latest Fiscal Year	2		2
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3		3
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	5		11
Financing receivables, 60 to 89 days past due | Consumer | Mortgage - Legacy
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2		2
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	2		2
Financing receivables, 60 to 89 days past due | Consumer | Consumer other | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1		4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2		1
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		1
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	3		6
Financing receivables, equal to greater than 90 days past due | Consumer | Consumer automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	4		32
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	35		108
Financing Receivable, Originated Two Years before Latest Fiscal Year	58		96
Financing Receivable, Originated Three Years before Latest Fiscal Year	45		71
Financing Receivable, Originated Four Years before Latest Fiscal Year	33		46
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	38		30
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	213		383
Financing receivables, equal to greater than 90 days past due | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0		1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1		5
Financing Receivable, Originated Two Years before Latest Fiscal Year	3		8
Financing Receivable, Originated Three Years before Latest Fiscal Year	9		10
Financing Receivable, Originated Four Years before Latest Fiscal Year	4		4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	20		21
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	37		49
Financing receivables, equal to greater than 90 days past due | Consumer | Mortgage - Legacy
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0		0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	16		20
Financing Receivable, Revolving	4		5
Revolving loans converted to term	1		2
Total finance receivables and loans	21		27
Financing receivables, equal to greater than 90 days past due | Consumer | Consumer other | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1		2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1		1
Financing Receivable, Originated Two Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0		0
Financing Receivable, Revolving	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	$ 2		$ 3

Finance Receivables and Loans_9

Finance Receivables and Loans, Net (Financing Receivable Credit Quality Indicators Commercial) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	$ 112,217	$ 118,534
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	979	2,711
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,096	2,122
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,942	1,399
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,084	1,272
Financing Receivable, Originated Four Years before Latest Fiscal Year	893	977
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,479	902
Financing Receivable, Revolving	12,963	19,807
Revolving loans converted to term	132	142
Total finance receivables and loans	21,568	29,332
Automotive loan | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	230	920
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	363	245
Financing Receivable, Originated Two Years before Latest Fiscal Year	224	117
Financing Receivable, Originated Three Years before Latest Fiscal Year	87	143
Financing Receivable, Originated Four Years before Latest Fiscal Year	90	86
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	112	52
Financing Receivable, Revolving	10,197	17,519
Revolving loans converted to term	0	0
Total finance receivables and loans	11,303	19,082
Automotive loan | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	218	869
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	353	220
Financing Receivable, Originated Two Years before Latest Fiscal Year	201	58
Financing Receivable, Originated Three Years before Latest Fiscal Year	45	91
Financing Receivable, Originated Four Years before Latest Fiscal Year	52	76
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	73	34
Financing Receivable, Revolving	9,261	15,433
Revolving loans converted to term	0	0
Total finance receivables and loans	10,203	16,781
Automotive loan | Special Mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	12	48
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	9	23
Financing Receivable, Originated Two Years before Latest Fiscal Year	23	59
Financing Receivable, Originated Three Years before Latest Fiscal Year	41	52
Financing Receivable, Originated Four Years before Latest Fiscal Year	38	9
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	37	18
Financing Receivable, Revolving	887	2,013
Revolving loans converted to term	0	0
Total finance receivables and loans	1,047	2,222
Automotive loan | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1	2
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	1	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2	0
Financing Receivable, Revolving	49	72
Revolving loans converted to term	0	0
Total finance receivables and loans	53	78
Automotive loan | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	1
Revolving loans converted to term	0	0
Total finance receivables and loans	0	1
Consumer other | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	297	645
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	564	817
Financing Receivable, Originated Two Years before Latest Fiscal Year	720	367
Financing Receivable, Originated Three Years before Latest Fiscal Year	221	514
Financing Receivable, Originated Four Years before Latest Fiscal Year	315	183
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	434	288
Financing Receivable, Revolving	2,763	2,288
Revolving loans converted to term	128	140
Total finance receivables and loans	5,442	5,242
Consumer other | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	297	536
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	457	622
Financing Receivable, Originated Two Years before Latest Fiscal Year	556	244
Financing Receivable, Originated Three Years before Latest Fiscal Year	194	210
Financing Receivable, Originated Four Years before Latest Fiscal Year	90	81
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	218	69
Financing Receivable, Revolving	2,675	2,142
Revolving loans converted to term	86	76
Total finance receivables and loans	4,573	3,980
Consumer other | Special Mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	76
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	75	169
Financing Receivable, Originated Two Years before Latest Fiscal Year	139	123
Financing Receivable, Originated Three Years before Latest Fiscal Year	27	190
Financing Receivable, Originated Four Years before Latest Fiscal Year	86	102
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	99	115
Financing Receivable, Revolving	71	123
Revolving loans converted to term	17	43
Total finance receivables and loans	514	941
Consumer other | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	33
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	32	26
Financing Receivable, Originated Two Years before Latest Fiscal Year	25	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	108
Financing Receivable, Originated Four Years before Latest Fiscal Year	138	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	90	77
Financing Receivable, Revolving	17	21
Revolving loans converted to term	25	20
Total finance receivables and loans	327	285
Consumer other | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	6
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	27	27
Financing Receivable, Revolving	0	2
Revolving loans converted to term	0	1
Total finance receivables and loans	27	36
Consumer other | Loss | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Revolving loans converted to term	0
Total finance receivables and loans	1
Commercial real estate | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	452	1,146
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,169	1,060
Financing Receivable, Originated Two Years before Latest Fiscal Year	998	915
Financing Receivable, Originated Three Years before Latest Fiscal Year	776	615
Financing Receivable, Originated Four Years before Latest Fiscal Year	488	708
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	933	562
Financing Receivable, Revolving	3	0
Revolving loans converted to term	4	2
Total finance receivables and loans	4,823	5,008
Commercial real estate | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	452	1,108
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,111	928
Financing Receivable, Originated Two Years before Latest Fiscal Year	867	799
Financing Receivable, Originated Three Years before Latest Fiscal Year	731	580
Financing Receivable, Originated Four Years before Latest Fiscal Year	457	651
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	869	512
Financing Receivable, Revolving	3	0
Revolving loans converted to term	4	2
Total finance receivables and loans	4,494	4,580
Commercial real estate | Special Mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	38
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	58	132
Financing Receivable, Originated Two Years before Latest Fiscal Year	131	116
Financing Receivable, Originated Three Years before Latest Fiscal Year	45	32
Financing Receivable, Originated Four Years before Latest Fiscal Year	31	49
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	49	43
Financing Receivable, Revolving	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	314	410
Commercial real estate | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	3
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	6
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	13	7
Financing Receivable, Revolving	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	13	16
Commercial real estate | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2	0
Financing Receivable, Revolving	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	$ 2	$ 2

Finance Receivables and Loan_10

Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans Commercial) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	$ 112,217	$ 118,534
Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	21,568	29,332
Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	11,303	19,082
Consumer other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	5,442	5,242
Consumer mortgage | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	4,823	5,008
Total past due | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	2	2
Total past due | Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Total past due | Consumer other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Total past due | Consumer mortgage | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	2	2
Financing receivables, 30 to 59 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 30 to 59 days past due | Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 30 to 59 days past due | Consumer other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 30 to 59 days past due | Consumer mortgage | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 60 to 89 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 60 to 89 days past due | Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 60 to 89 days past due | Consumer other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 60 to 89 days past due | Consumer mortgage | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, equal to greater than 90 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	2	2
Financing receivables, equal to greater than 90 days past due | Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, equal to greater than 90 days past due | Consumer other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, equal to greater than 90 days past due | Consumer mortgage | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	2	2
Current | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	21,566	29,330
Current | Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	11,303	19,082
Current | Consumer other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	5,442	5,242
Current | Consumer mortgage | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	$ 4,821	$ 5,006

Finance Receivables and Loan_11

Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)loan	Jun. 30, 2020USD ($)loan	Jun. 30, 2021USD ($)loan	Jun. 30, 2020USD ($)loan	Dec. 31, 2020USD ($)
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, gross carrying value	$ 2,400		$ 2,400		$ 2,200
Loans and leases receivable, impaired, commitment to lend	$ 21		$ 21		$ 14
Financing receivable, modifications, number of loans | loan	14,685	21,338	40,282	44,181
Financing receivable, modifications, pre-modification amortized cost basis	$ 280	$ 391	$ 789	$ 746
Financing receivable, modifications, post-modification amortized cost basis	$ 277	$ 344	$ 780	$ 677
Consumer
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans | loan	14,683	21,335	40,279	44,177
Financing receivable, modifications, pre-modification amortized cost basis	$ 276	$ 337	$ 752	$ 685
Financing receivable, modifications, post-modification amortized cost basis	$ 273	$ 311	$ 743	$ 637
Consumer | Automotive loan
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans | loan	14,670	21,293	40,260	44,093
Financing receivable, modifications, pre-modification amortized cost basis	$ 271	$ 323	$ 743	$ 663
Financing receivable, modifications, post-modification amortized cost basis	$ 267	$ 297	$ 733	$ 615
Consumer | Consumer mortgage
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans | loan	13	42	19	84
Financing receivable, modifications, pre-modification amortized cost basis	$ 5	$ 14	$ 9	$ 22
Financing receivable, modifications, post-modification amortized cost basis	$ 6	$ 14	$ 10	$ 22
Consumer | Mortgage Finance
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans | loan	10	19	15	29
Financing receivable, modifications, pre-modification amortized cost basis	$ 4	$ 11	$ 8	$ 15
Financing receivable, modifications, post-modification amortized cost basis	$ 5	$ 11	$ 9	$ 15
Consumer | Mortgage - Legacy
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans | loan	3	23	4	55
Financing receivable, modifications, pre-modification amortized cost basis	$ 1	$ 3	$ 1	$ 7
Financing receivable, modifications, post-modification amortized cost basis	$ 1	$ 3	$ 1	$ 7
Commercial
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans | loan	2	3	3	4
Financing receivable, modifications, pre-modification amortized cost basis	$ 4	$ 54	$ 37	$ 61
Financing receivable, modifications, post-modification amortized cost basis	$ 4	$ 33	$ 37	$ 40
Commercial | Automotive loan
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans | loan	1	2	1	3
Financing receivable, modifications, pre-modification amortized cost basis	$ 1	$ 31	$ 1	$ 38
Financing receivable, modifications, post-modification amortized cost basis	$ 1	$ 26	$ 1	$ 33
Commercial | Consumer other
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans | loan	0	1	1	1
Financing receivable, modifications, pre-modification amortized cost basis	$ 0	$ 23	$ 33	$ 23
Financing receivable, modifications, post-modification amortized cost basis	$ 0	$ 7	$ 33	$ 7
Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans | loan	1	0	1	0
Financing receivable, modifications, pre-modification amortized cost basis	$ 3	$ 0	$ 3	$ 0
Financing receivable, modifications, post-modification amortized cost basis	$ 3	$ 0	$ 3	$ 0

Finance Receivables and Loan_12

Finance Receivables and Loans, Net (Finance Receivables and Loans Redefaulted During the Period) (Details) - Consumer $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)loan	Jun. 30, 2020USD ($)loan	Jun. 30, 2021USD ($)loan	Jun. 30, 2020USD ($)loan
Accounts, Notes, Loans and Financing Receivable
Number of loans | loan	1,754	1,119	4,570	2,283
Amortized cost	$ 22	$ 11	$ 55	$ 24
Charge-off amount	$ 11	$ 8	$ 31	$ 17
Automotive loan
Accounts, Notes, Loans and Financing Receivable
Number of loans | loan	1,751	1,119	4,565	2,283
Amortized cost	$ 22	$ 11	$ 55	$ 24
Charge-off amount	$ 11	$ 8	$ 31	$ 17
Mortgage Finance
Accounts, Notes, Loans and Financing Receivable
Number of loans | loan	1	0	1	0
Amortized cost	$ 0	$ 0	$ 0	$ 0
Charge-off amount	$ 0	$ 0	$ 0	$ 0
Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable
Number of loans | loan	2	0	4	0
Amortized cost	$ 0	$ 0	$ 0	$ 0
Charge-off amount	$ 0	$ 0	$ 0	$ 0

Leasing (Ally as the Lessee) (D

Leasing (Ally as the Lessee) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Noncancelable lease term			367 days
Lease extension, maximum			48 months
Cash paid for amounts included in the measurement of lease liabilities	$ 16	$ 12	$ 29	$ 25
Right-of-use asset obtained in exchange for operating lease liability			$ 333	$ 43
Operating lease, weighted-average remaining lease term	7 years		7 years			7 years
Operating lease, weighted average discount rate	2.15%		2.15%			2.21%
Finance lease liabilities	$ 326		$ 326			$ 0
Undiscounted future lease payments					$ 13
Term of contract					10 years
Minimum
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term	3 months		3 months
Option to terminate			5 years
Maximum
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term	11 years		11 years
Option to terminate			6 years
Land and Building | Minimum
Lessee, Lease, Description [Line Items]
Option to extend			1 year
Land and Building | Maximum
Lessee, Lease, Description [Line Items]
Option to extend			15 years

Leasing (Lessee, Operating Leas

Leasing (Lessee, Operating Lease, Liability, Maturity) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Leases [Abstract]
2021	$ 20
2022	35
2023	27
2024	20
2025	18
2026 and thereafter	58
Total undiscounted cash flows	178
Difference between undiscounted cash flows and discounted cash flows	(11)
Total lease liability	$ 167	$ 187

Leasing (Lease, Cost) (Details)

Leasing (Lease, Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease expense	$ 14	$ 11	$ 26	$ 24
Variable lease expense	2	2	4	4
Total lease expense, net	$ 16	$ 13	$ 30	$ 28

Leasing (Ally as the Lessor) (D

Leasing (Ally as the Lessor) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Lessor, Lease, Description [Line Items]
Residual value guarantee, percentage	15.00%	15.00%
Vehicles	$ 12,170	$ 11,182
Accumulated depreciation	(1,455)	(1,543)
Investment in operating leases, net	$ 10,715	9,639
Minimum
Lessor, Lease, Description [Line Items]
Lessor, operating lease, lessee option to purchase underlying asset	24
Maximum
Lessor, Lease, Description [Line Items]
Lessor, operating lease, lessee option to purchase underlying asset	60 months
Vehicles
Lessor, Lease, Description [Line Items]
Residual value of leased asset	$ 264	$ 352

Leasing (Lessor, Operating Leas

Leasing (Lessor, Operating Lease, Payments to be Received, Maturity) (Details) $ in Millions	Jun. 30, 2021USD ($)
Leases [Abstract]
2021	$ 818
2022	1,326
2023	877
2024	274
2025	36
2026 and thereafter	2
Total lease payments from operating leases	$ 3,333

Leasing (Depreciation Expense o

Leasing (Depreciation Expense on Operating Lease Assets) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease revenue	$ 384	$ 343	$ 754	$ 710
Depreciation expense on operating lease assets	210	241	437	491
Remarketing (gains) losses, net	(128)	11	(192)	9
Net depreciation expense on operating lease assets	82	252	245	500
Variable lease payments, excessive wear and tear	$ 5	$ 5	$ 10	$ 12

Leasing (Sales-type and Direct

Leasing (Sales-type and Direct Financing Leases, Lease Receivable, Maturity) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Leases [Abstract]
Direct financing lease, net investment in lease	$ 496		$ 496		$ 450
Direct financing lease, present value of lease payments recorded as lease receivable	483		483		437
Direct financing lease, unguaranteed residual asset	13		13		13
Direct financing lease, interest income	7	$ 5	13	$ 11
2021	90		90
2022	152		152
2023	124		124
2024	97		97
2025	44		44
2026 and thereafter	29		29
Total undiscounted cash flows	536		536
Difference between undiscounted cash flows and discounted cash flows	(53)		(53)
Present value of lease payments recorded as lease receivable	$ 483		$ 483		$ 437

Securitizations and Variable _3

Securitizations and Variable Interest Entities (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Sales of financial assets	$ 0	$ 0	$ 0	$ 0
Off-balance sheet variable interest entities | Consumer Automotive Industry Sector
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Net credit losses recognized				$ 1,000,000

Securitizations and Variable _4

Securitizations and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Variable Interest Entity [Line Items]
Carrying value of total assets	$ 180,470	$ 182,165	$ 184,061
Carrying value of total liabilities	162,940	167,462
On-balance sheet variable interest entities
Variable Interest Entity [Line Items]
Carrying value of total assets	9,878	14,196
Carrying value of total liabilities	1,850	4,161
On-balance sheet variable interest entities | Consumer Automotive Industry Sector
Variable Interest Entity [Line Items]
Carrying value of total assets	18,448	17,833
Carrying value of total liabilities	1,964	3,103
Assets held-in-trust	10,900	9,900
Non-recourse debt	114	94
On-balance sheet variable interest entities | Commercial Automotive Industry Sector
Variable Interest Entity [Line Items]
Carrying value of total assets	2,306	6,276
Carrying value of total liabilities	1	1,152
Off-balance sheet variable interest entities
Variable Interest Entity [Line Items]
Carrying value of total assets	22,317	25,404
Carrying value of total liabilities	2,631	4,784
Assets sold to nonconsolidated VIEs	0	0
Maximum exposure to loss in nonconsolidated VIEs	2,040	1,754
Off-balance sheet variable interest entities | Commercial Other Industry Sector
Variable Interest Entity [Line Items]
Carrying value of total assets	1,563	1,295
Carrying value of total liabilities	666	529
Assets sold to nonconsolidated VIEs	0	0
Maximum exposure to loss in nonconsolidated VIEs	$ 2,040	$ 1,754

Securitizations and Variable _5

Securitizations and Variable Interest Entities (Schedule of Cash Flow Received from and Paid to Nonconsolidated Securitization Entities) (Details) - Off-balance sheet variable interest entities - Consumer Automotive Industry Sector - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]
Cash flows received on retained interests in securitization entities	$ 0	$ 8
Servicing fees	0	2
Cash disbursements for repurchases during the period	0	(2)
Total	$ 0	$ 8

Other Assets (Schedule of Other

Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Other Assets [Abstract]
Property and equipment at cost	$ 1,668	$ 1,668	$ 1,541
Accumulated depreciation	(877)	(877)	(815)
Net property and equipment	791	791	726
Investment in qualified affordable housing projects	1,261	1,261	1,095
Nonmarketable equity investments	939	939	915
Net deferred tax assets	889	889	94
Restricted cash held for securitization trusts	702	702	875
Accrued interest, fees, and rent receivables	572	572	704
Equity-method investments	382	382	320
Goodwill	343	343	343
Finance lease right-of-use assets	327	327	0
Operating lease right-of-use assets	142	142	162
Other accounts receivable	128	128	166
Restricted cash and cash equivalents	79	79	78
Net intangible assets	41	41	50
Fair value of derivative contracts in receivable position	16	16	17
Other assets	893	893	870
Total other assets	7,505	7,505	6,415
Federal Home Loan Bank stock	239	239	276
Federal Reserve Bank stock	449	449	449
Equity securities without a readily determinable fair value	251	251	189
Annual adjustment amount	81	81
Equity securities without readily determinable fair value, impairment loss, amount	1	1
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount	176	176
Impairment related to equity securities without a readily determinable fair value	13	13
Gross intangible assets	109	109	109
Intangible assets, accumulated amortization	$ 68	$ 68	$ 59

Other Assets (Schedule of Goodw

Other Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions	Apr. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Goodwill [Roll Forward]
Goodwill beginning balance				$ 343
Impairment losses		$ 0	$ (50)	0	$ (50)
Goodwill ending balance		343		343
Operating Segments | Automotive Finance operations
Goodwill [Roll Forward]
Goodwill beginning balance				20
Impairment losses				0
Goodwill ending balance		20		20
Operating Segments | Insurance operations
Goodwill [Roll Forward]
Goodwill beginning balance				27
Impairment losses				0
Goodwill ending balance		27		27
Corporate and Other
Goodwill [Roll Forward]
Goodwill beginning balance				296
Impairment losses	$ (50)			0
Goodwill ending balance		296		296
Ally Lending | Corporate and Other
Goodwill [Roll Forward]
Goodwill beginning balance				153
Goodwill ending balance		153		153
Ally Invest | Corporate and Other
Goodwill [Roll Forward]
Goodwill beginning balance				143
Goodwill ending balance		$ 143		$ 143

Deposit Liabilities (Schedule o

Deposit Liabilities (Schedule of Deposit Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Deposits [Abstract]
Noninterest-bearing deposits	$ 149	$ 128
Interest-bearing deposits
Savings, money market, and checking accounts	93,702	83,698
Certificates of deposit	45,253	53,210
Total deposit liabilities	139,104	137,036
Certificates of deposit, $100,000 or more	22,800	25,800
Certificates of deposit, in excess of $250,000 federal insurance limits	$ 7,700	$ 8,600

Debt (Schedule of Short-term De

Debt (Schedule of Short-term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Demand notes	$ 0	$ 2,136
Total short-term borrowings	0	2,136
Unsecured debt
Short-term Debt [Line Items]
Demand notes	0	2,136
Total short-term borrowings	0	2,136
Secured debt
Short-term Debt [Line Items]
Demand notes	0	0
Total short-term borrowings	$ 0	$ 0

Debt (Long-term Debt) (Details)

Debt (Long-term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt, due within one year	$ 7,147	$ 5,085
Long-term debt, due after one year	9,749	16,921
Total long-term debt	16,896	22,006
Trust preferred securities	1,200	2,600
Secured debt	7,006	9,992
Unsecured debt
Debt Instrument [Line Items]
Long-term debt, due within one year	966	647
Long-term debt, due after one year	8,924	11,367
Total long-term debt	9,890	12,014
Secured debt
Debt Instrument [Line Items]
Long-term debt, due within one year	6,181	4,438
Long-term debt, due after one year	825	5,554
Total long-term debt	7,006	9,992
Federal Home Loan Bank advances
Debt Instrument [Line Items]
Secured debt	$ 5,000	$ 5,800

Debt (Scheduled Remaining Matur

Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt, maturities, repayments of principal in next 12 months	$ 2,467
Long-term debt, maturities, repayments of principal in year two	5,919
Long-term debt, maturities, repayments of principal in year three	2,668
Long-term debt, maturities, repayments of principal in year four	1,450
Long-term debt, maturities, repayments of principal in year five	2,303
Long-term debt, maturities, repayments of principal after year five	2,089
Total long-term debt	16,896	$ 22,006
Unsecured debt
Debt Instrument [Line Items]
Long-term debt, maturities, repayments of principal in next 12 months	1,008
Long-term debt, maturities, repayments of principal in year two	1,052
Long-term debt, maturities, repayments of principal in year three	2,051
Long-term debt, maturities, repayments of principal in year four	1,409
Long-term debt, maturities, repayments of principal in year five	2,291
Long-term debt, maturities, repayments of principal after year five	2,079
Total long-term debt	9,890	12,014
Secured debt
Debt Instrument [Line Items]
Total long-term debt	7,006	$ 9,992
Long-term debt | Unsecured debt
Debt Instrument [Line Items]
Long-term debt, maturities, repayments of principal in next 12 months	1,074
Long-term debt, maturities, repayments of principal in year two	1,103
Long-term debt, maturities, repayments of principal in year three	2,108
Long-term debt, maturities, repayments of principal in year four	1,473
Long-term debt, maturities, repayments of principal in year five	2,360
Long-term debt, maturities, repayments of principal after year five	2,755
Total long-term debt	10,873
Long-term debt | Secured debt
Debt Instrument [Line Items]
Long-term debt, maturities, repayments of principal in next 12 months	1,459
Long-term debt, maturities, repayments of principal in year two	4,867
Long-term debt, maturities, repayments of principal in year three	617
Long-term debt, maturities, repayments of principal in year four	41
Long-term debt, maturities, repayments of principal in year five	12
Long-term debt, maturities, repayments of principal after year five	10
Total long-term debt	7,006
Original issue discount | Unsecured debt
Debt Instrument [Line Items]
Debt instrument, unamortized discount, current	(66)
Debt instrument, unamortized discount	(983)
Original issue discount | Unsecured debt | 2022
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(51)
Original issue discount | Unsecured debt | 2023
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(57)
Original issue discount | Unsecured debt | 2024
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(64)
Original issue discount | Unsecured debt | 2025
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(69)
Original issue discount | Unsecured debt | 2026 and thereafter
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	$ (676)

Debt (Pledged Assets Related to

Debt (Pledged Assets Related to Secured Borrowings and Repurchase Agreement) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, mortgage finance receivables	$ 13,968	$ 14,979
Pledged assets, restricted as collateral	25,775	35,798
Secured debt	7,006	9,992
Consumer | Consumer automotive
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, finance receivables	9,660	9,953
Commercial | Consumer automotive
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, finance receivables	2,147	10,866
Ally Bank
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, mortgage finance receivables	13,968	14,979
Pledged assets, restricted as collateral	25,359	35,355
Secured debt	6,700	9,634
Ally Bank | Pledged assets for Federal Home Loan Bank
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, restricted as collateral	14,000	20,000
Ally Bank | Pledged assets for Federal Reserve Bank
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, restricted as collateral	2,400	2,400
Ally Bank | Consumer | Consumer automotive
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, finance receivables	9,244	9,510
Ally Bank | Commercial | Consumer automotive
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, finance receivables	$ 2,147	$ 10,866

Debt (Narrative - Trust Preferr

Debt (Narrative - Trust Preferred Securities) (Details) $ / shares in Units, $ in Millions	Jul. 02, 2021USD ($)shares	Jun. 02, 2021USD ($)	Apr. 22, 2021USD ($)shares	Jun. 30, 2021USD ($)quarter$ / shares	Jun. 30, 2020USD ($)	Apr. 30, 2021$ / shares	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Trust preferred securities				$ 1,200			$ 2,600
Liquidation preference (in dollars per share) | $ / shares				$ 25
Distribution payable in addition to annual rate equal to three-month London interbank offer rate, percentage				5.785%
Period of consecutive quarters for which Ally has right to defer interest payments, maximum | quarter				20
Redemption price, percentage of principal debt, plus accrued and unpaid interest				100.00%
Preferred stock issuance				$ 2,326	$ 0
Trust preferred securities redemption				$ 1,442	$ 0
Series B Preferred Stock
Debt Instrument [Line Items]
Liquidation preference (in dollars per share) | $ / shares				$ 1,000		$ 1,000
Preferred stock issuance			$ 1,350
Series C Preferred Stock
Debt Instrument [Line Items]
Liquidation preference (in dollars per share) | $ / shares				$ 1,000
Preferred stock issuance		$ 1,000
Trust Preferred Securities Subject to Mandatory Redemption
Debt Instrument [Line Items]
Trust preferred securities redemption			$ 1,400
Debt redeemed during period, number of shares | shares			56,000,000
Trust Preferred Securities Subject to Mandatory Redemption | Subsequent event
Debt Instrument [Line Items]
Trust preferred securities redemption	$ 1,040
Debt redeemed during period, number of shares | shares	41,600,000
Variable Income Interest Rate
Debt Instrument [Line Items]
Trust preferred securities				$ 1,200			$ 2,600
Trust Preferred Securities Subject to Mandatory Redemption
Debt Instrument [Line Items]
Series 2 TRUPS included in Tier 1 capital				$ 181

Debt (Committed Funding Facilit

Debt (Committed Funding Facilities) (Details) - Committed funding facilities - Secured debt - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term line of credit	$ 132	$ 0
Line of credit facility, remaining borrowing capacity	168	560
Line of credit facility, maximum borrowing capacity	300	560
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	300
Revolving secured funding facilities 1 year or greater
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	125
Ally Financial Inc
Debt Instrument [Line Items]
Long-term line of credit	132	0
Line of credit facility, remaining borrowing capacity	168	560
Line of credit facility, maximum borrowing capacity		$ 560
Ally Financial Inc | Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 300

Accrued Expenses and Other Li_3

Accrued Expenses and Other Liabilities (Schedule of Accrued Expenses and Other Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable	$ 663	$ 602
Unfunded commitments for investment in qualified affordable housing projects	662	525
Employee compensation and benefits	348	316
Finance lease liabilities	326	0
Operating lease liabilities	167	187
Deferred revenue	146	104
Reserves for insurance losses and loss adjustment expenses	126	129	$ 132	$ 122
Fair value of derivative contracts in payable position	47	33
Net deferred tax liabilities	17	92
Cash collateral received from counterparties	4	6
Other liabilities	533	440
Total accrued expenses and other liabilities	$ 3,039	$ 2,434
Operating lease, liability, statement of financial position [Extensible List]	Total accrued expenses and other liabilities	Total accrued expenses and other liabilities

Preferred Stock (Details)

Preferred Stock (Details) - $ / shares	1 Months Ended		6 Months Ended
	Jun. 30, 2021	Apr. 30, 2021	Jun. 30, 2021
Class of Stock [Line Items]
Liquidation preference (in dollars per share)	$ 25		$ 25
Series B Preferred Stock
Class of Stock [Line Items]
Number of shares issued	1,350,000	1,350,000	1,350,000
Dividend/coupon rate		4.70%
Par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Liquidation preference (in dollars per share)	$ 1,000	$ 1,000	$ 1,000
Series B Preferred Stock, On And After May 15, 2026 | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Dividend/coupon rate		3.868%	3.868%
Series C Preferred Stock
Class of Stock [Line Items]
Number of shares issued	1,000,000		1,000,000
Dividend/coupon rate	4.70%
Par value (in dollars per share)	$ 0.01		$ 0.01
Liquidation preference (in dollars per share)	$ 1,000		$ 1,000
Series C Preferred Stock, On And After May 15, 2026 | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Dividend/coupon rate	3.481%		3.481%

Preferred Stock (Schedule of Pr

Preferred Stock (Schedule of Preferred Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		6 Months Ended
	Jun. 30, 2021	Apr. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Carrying value	$ 2,324		$ 2,324	$ 0
Liquidation preference (in dollars per share)	$ 25		$ 25
Series B Preferred Stock
Class of Stock [Line Items]
Carrying value	$ 1,335		$ 1,335
Par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Liquidation preference (in dollars per share)	$ 1,000	$ 1,000	$ 1,000
Number of shares authorized	1,350,000		1,350,000
Number of shares issued	1,350,000	1,350,000	1,350,000
Number of shares outstanding	1,350,000		1,350,000
Dividend/coupon rate		4.70%
Series B Preferred Stock, Prior To May 15, 2026
Class of Stock [Line Items]
Dividend/coupon rate			4.70%
Series B Preferred Stock, On And After May 15, 2026 | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Dividend/coupon rate		3.868%	3.868%
Series C Preferred Stock
Class of Stock [Line Items]
Carrying value	$ 989		$ 989
Par value (in dollars per share)	$ 0.01		$ 0.01
Liquidation preference (in dollars per share)	$ 1,000		$ 1,000
Number of shares authorized	1,000,000		1,000,000
Number of shares issued	1,000,000		1,000,000
Number of shares outstanding	1,000,000		1,000,000
Dividend/coupon rate	4.70%
Series C Preferred Stock, Prior To May 15, 2026
Class of Stock [Line Items]
Dividend/coupon rate			4.70%
Series C Preferred Stock, On And After May 15, 2026 | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Dividend/coupon rate	3.481%		3.481%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 14,625	$ 13,519	$ 14,703	$ 14,416
Net change	189	109	(415)	692
Ending balance	17,530	13,826	17,530	13,826
Accumulated other comprehensive income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	27	706	631	123
Ending balance	216	815	216	815
Unrealized gains on investment securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	53	661	640	208
Net change	206	122	(381)	575
Ending balance	259	783	259	783
Translation adjustments and net investment hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	20	18	19	19
Net change	0	1	1	0
Ending balance	20	19	20	19
Cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	65	130	82	2
Net change	(17)	(14)	(34)	114
Ending balance	48	116	48	116
Defined benefit pension plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(111)	(103)	(110)	(106)
Net change	0	0	(1)	3
Ending balance	$ (111)	$ (103)	$ (111)	$ (103)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	$ 247	$ 138	$ (543)	$ 907
Other comprehensive income (loss), tax effect	(58)	(29)	128	(215)
Other comprehensive income (loss), net of tax	189	109	(415)	692
Investment securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gains (losses) arising during the period, before tax	276	175	(460)	877
Net unrealized gains (losses) arising during the period, tax	(65)	(38)	109	(206)
Net unrealized gains (losses) arising during the period, net of tax	211	137	(351)	671
Net realized gains reclassified to income from continuing operations, before tax	6	19	38	124
Net realized gains reclassified to income from continuing operations, tax	(1)	(4)	(8)	(28)
Net realized gains reclassified to income from continuing operations, net of tax	5	15	30	96
Other comprehensive income (loss), before tax	270	156	(498)	753
Other comprehensive income (loss), tax effect	(64)	(34)	117	(178)
Other comprehensive income (loss), net of tax	206	122	(381)	575
Translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	2	6	5	(7)
Other comprehensive income (loss), tax effect	0	(1)	(1)	2
Other comprehensive income (loss), net of tax	2	5	4	(5)
Net investment hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	(3)	(5)	(5)	7
Other comprehensive income (loss), tax effect	1	1	2	(2)
Other comprehensive income (loss), net of tax	(2)	(4)	(3)	5
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gains (losses) arising during the period, before tax				169
Net unrealized gains (losses) arising during the period, tax				(41)
Net unrealized gains (losses) arising during the period, net of tax				128
Net realized gains reclassified to income from continuing operations, before tax	22	19	43	19
Net realized gains reclassified to income from continuing operations, tax	(5)	(5)	(9)	(5)
Net realized gains reclassified to income from continuing operations, net of tax	$ 17	$ 14	34	14
Other comprehensive income (loss), before tax				150
Other comprehensive income (loss), tax effect				(36)
Other comprehensive income (loss), net of tax				114
Defined benefit pension plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax			(2)	4
Other comprehensive income (loss), tax effect			1	(1)
Other comprehensive income (loss), net of tax			$ (1)	$ 3

Earnings per Common Share (Sche

Earnings per Common Share (Schedule of Basic and Diluted Earnings per Common Share) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income (loss) from continuing operations		$ 899	$ 242	$ 1,695	$ (77)
Income (loss) from discontinued operations, net of tax		1	(1)	1	(1)
Net income (loss)		$ 900	$ 241	$ 1,696	$ (78)
Basic weighted-average common shares outstanding		370,412,000	375,051,000	372,807,000	375,387,000
Diluted weighted-average common shares outstanding		373,029,000	375,762,000	375,265,000	375,387,000
Basic earnings per common share
Net income (loss) from continuing operations (in dollars per share)	[1]	$ 2.43	$ 0.65	$ 4.55	$ (0.20)
Net income (loss) (in dollars per share)	[1]	2.43	0.64	4.55	(0.21)
Diluted earnings per common share
Net income (loss) from continuing operations (in dollars per share)	[1],[2]	2.41	0.64	4.52	(0.20)
Net income (loss) (in dollars per share)	[1],[2]	$ 2.41	$ 0.64	$ 4.52	$ (0.21)
Antidilutive securities excluded from computation of earnings per share, amount		0	2,300,000	0	2,400,000
[1]	Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.
[2]	Due to the antidilutive effect of the net loss from continuing operations for the six months ended June 30, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share.

Regulatory Capital and Other _3

Regulatory Capital and Other Regulatory Matters (Schedule of Regulatory Capital Amount and Ratios) (Details) $ in Millions	Jun. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
BHC enhanced prudential standards, minimum	$ 100,000
BHC enhanced prudential standards, maximum	250,000
Average wSTWF exemption threshold	$ 50,000
Minimum capital conservation buffer	0.025
Accounting Standards Update 2016-13
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Phase-in of capital impact of Accounting Standards Update 2016-13	25.00%
CECL scaling factor	25.00%
Deferred reduction to Common Equity Tier 1 Capital from CECL	$ 1,100
Ally Financial Inc
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital ratio	0.1132	0.1064
Minimum capital conservation buffer	0.035	0.035
Common equity tier one capital	$ 15,709	$ 14,878
Tier one capital to risk-weighted assets, amount	$ 18,150	$ 17,289
Tier one capital to risk-weighted assets, ratio	0.1308	0.1237
Tier one capital to risk-weighted assets, well-capitalized minimum	0.0600
Capital to risk-weighted assets, amount	$ 20,575	$ 19,778
Capital to risk-weighted assets, ratio	0.1483	0.1415
Capital to risk weighted assets, well-capitalzed minimum	0.1000
Tier one leverage to adjusted quarterly average assets, amount	$ 18,150	$ 17,289
Tier one leverage to adjusted quarterly average assets, ratio	0.1000	0.0941
Ally Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital ratio	0.1392	0.1338
Minimum capital conservation buffer	0.025	0.025
Common equity tier one capital	$ 18,113	$ 17,567
Common equity tier one capital, well capitalized minimum	0.0650
Tier one capital to risk-weighted assets, amount	$ 18,113	$ 17,567
Tier one capital to risk-weighted assets, ratio	0.1392	0.1338
Tier one capital to risk-weighted assets, well-capitalized minimum	0.0800
Capital to risk-weighted assets, amount	$ 19,740	$ 19,210
Capital to risk-weighted assets, ratio	0.1517	0.1463
Capital to risk weighted assets, well-capitalzed minimum	0.1000
Tier one leverage to adjusted quarterly average assets, amount	$ 18,113	$ 17,567
Tier one leverage to adjusted quarterly average assets, ratio	0.1058	0.1012
Tier one leverage to adjusted quarterly average assets, well-capitalized minimum	0.0500
Minimum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital ratio	0.045
Tier one capital to risk-weighted assets, required minimum	0.06
Capital to risk-weighted assets, required minimum	0.08
Tier one leverage ratio, minimum	0.04
Minimum | Ally Financial Inc
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital ratio	0.0450
Tier one capital to risk-weighted assets, required minimum	0.0600
Capital to risk-weighted assets, required minimum	0.0800
Tier one leverage ratio, minimum	0.0400
Minimum | Ally Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital ratio	0.0450
Tier one capital to risk-weighted assets, required minimum	0.0600
Capital to risk-weighted assets, required minimum	0.0800
Tier one leverage ratio, minimum	0.0400

Regulatory Capital and Other _4

Regulatory Capital and Other Regulatory Matters (Common Share Repurchases) (Details) - USD ($)		Jul. 12, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Jan. 11, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Accelerated Share Repurchases [Line Items]
Cash dividends declared per common share (in dollars per share)	[1],[2]		$ 0.19	$ 0.19	$ 0.38	$ 0.38
Treasury stock, common, amount			$ 502,000,000	$ 0	$ 502,000,000	$ 0	$ 219,000,000		$ 1,000,000	$ 1,000,000	$ 104,000,000
Treasury stock, common, shares (in shares)			9,641,000	53,000	9,641,000	53,000	5,276,000		37,000	9,000	3,838,000
Common stock, shares outstanding (in shares)			362,638,597	373,837,000	362,638,597	373,837,000	371,805,000		374,674,415	373,857,000	373,155,000	374,332,000
Dividends declared (in dollars per share)			$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19		$ 0.19	$ 0.19	$ 0.19
Common stock
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount								$ 1,600,000,000
Cash dividends declared per common share (in dollars per share)			$ 0.19
Common stock | Subsequent event
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount		$ 2,000,000,000
Cash dividends declared per common share (in dollars per share)		$ 0.25
Dividends payable, date declared		Jul. 12, 2021
Dividends payable, date to be paid		Aug. 16, 2021
Dividends payable, date of record		Aug. 2, 2021
Series B Preferred Stock
Accelerated Share Repurchases [Line Items]
Gross proceeds from issuance of series preferred stock			$ 1,350,000,000
Series C Preferred Stock
Accelerated Share Repurchases [Line Items]
Gross proceeds from issuance of series preferred stock			$ 1,000,000,000
[1]	Due to the antidilutive effect of the net loss from continuing operations for the six months ended June 30, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share.
[2]	Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash collateral placed with counterparties	$ 3	$ 4
Noncash collateral placed with counterparties	151	$ 145
Cash collateral received from counterparties	$ 4

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities (Fair Value Amounts of Derivative Instruments Reported on our Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	$ 16	$ 17
Fair value of derivative contracts in payable position	47	33
Derivative, notional amount	19,992	13,688
Credit derivative, maximum exposure, undiscounted	84	56
Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	3	1
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	18,790	12,549
Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	13	16
Fair value of derivative contracts in payable position	47	33
Derivative, notional amount	1,202	1,139
Interest rate contracts | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	9	16
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	1,038	978
Interest rate swaps | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	0
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	18,620	12,385
Interest rate futures and forwards | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	2	1
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	314	391
Interest rate written options | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	7	15
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	592	587
Interest rate purchased options | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	0
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	132	0
Foreign exchange contracts | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	1	0
Fair value of derivative contracts in payable position	0	1
Derivative, notional amount	162	159
Foreign exchange forwards | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	3	1
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	170	164
Foreign exchange futures and forwards | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	1	0
Fair value of derivative contracts in payable position	0	1
Derivative, notional amount	162	159
Other credit derivatives | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	0
Fair value of derivative contracts in payable position	46	28
Equity contracts | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	3	0
Fair value of derivative contracts in payable position	1	4
Derivative, notional amount	2	2
Equity contract written options | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	0
Fair value of derivative contracts in payable position	1	4
Derivative, notional amount	1	2
Purchased Options | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	3	0
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	$ 1	$ 0

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities (Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Available-for-sale securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, fair value hedge	$ 5,380	$ 1,259
Hedged asset, fair value hedge, cumulative increase (decrease)	9	39
Closed portfolio and beneficial interest, last-of-layer, amortized cost	3,500	592
Hedged asset, last-of-layer, amount	2,900
Hedge basis adjustment, last-of-layer	(5)
Finance receivables and loans, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, fair value hedge	36,462	28,393
Hedged asset, fair value hedge, cumulative increase (decrease)	124	225
Hedged asset, last-of-layer, amount	12,700	9,400
Hedge basis adjustment, last-of-layer	63	153
Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged liability, fair value hedge	7,189	8,656
Hedged liability, fair value hedge, cumulative increase (decrease)	102	169
Discontinued hedge | Available-for-sale securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	15	28
Hedged asset, last-of-layer, amount	1,700	1,200
Hedge basis adjustment, last-of-layer	15	20
Discontinued hedge | Finance receivables and loans, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	61	72
Hedged asset, last-of-layer, amount	20,100	18,500
Hedge basis adjustment, last-of-layer	61	72
Discontinued hedge | Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged liability, discontinued fair value hedge, cumulative increase (decrease)	$ 127	$ 203

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities (Statement of Gains and Losses on Derivative Instruments Reported in Statement of Comprehensive Income) (Details) - Not designated as hedging instrument - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments recognized in earnings	$ (8)	$ (28)	$ (25)	$ (35)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments recognized in earnings	1	(23)	(6)	(38)
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments recognized in earnings	(2)	(5)	(4)	3
Other credit derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments recognized in earnings	(7)	0	(15)	0
Loss on mortgage and automotive loans | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments recognized in earnings	(1)	0	(8)	(15)
Other income, net of losses | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments recognized in earnings	2	(23)	2	(23)
Other income, net of losses | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments recognized in earnings	0	(5)	0	3
Other income, net of losses | Other credit derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments recognized in earnings	(7)	0	(15)	0
Other operating expenses | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments recognized in earnings	$ (2)	$ 0	$ (4)	$ 0

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities (Derivative Instruments Designated as Fair Value Hedges, Gain (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Interest and fees on finance receivables and loans	$ 1,588	$ 1,630	$ 3,170	$ 3,372
Interest and dividends on investment securities and other earning assets	147	197	278	423
Interest on deposits	268	541	574	1,133
Interest on long-term debt	230	318	480	666
Earnings on cash flow hedges to be recognized within twelve months			29
Designated as hedging instrument | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Total gain on fair value hedging relationships	0	0	0	0
Total gain (loss) on cash flow hedging relationships	22	22	44	25
Designated as hedging instrument | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Total gain on fair value hedging relationships	0	0	0	0
Total gain (loss) on cash flow hedging relationships	0	0	0	0
Designated as hedging instrument | Interest on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Total gain on fair value hedging relationships	0	0	0	0
Total gain (loss) on cash flow hedging relationships	0	(2)	(1)	(5)
Designated as hedging instrument | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Total gain on fair value hedging relationships	0	0	0	0
Total gain (loss) on cash flow hedging relationships	0	0	0	0
Designated as hedging instrument | Unsecured debt | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Designated as hedging instrument | Unsecured debt | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Designated as hedging instrument | Unsecured debt | Interest on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Designated as hedging instrument | Unsecured debt | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	(66)	0	73	(170)
Change in unrealized gain (loss) on fair value hedging instruments	66	0	(73)	170
Designated as hedging instrument | Available-for-sale securities | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Designated as hedging instrument | Available-for-sale securities | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	(4)	4	(17)	45
Change in unrealized gain (loss) on fair value hedging instruments	4	(4)	17	(45)
Designated as hedging instrument | Available-for-sale securities | Interest on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Designated as hedging instrument | Available-for-sale securities | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Designated as hedging instrument | Fixed-rate automotive loans | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	(38)	(23)	(77)	225
Change in unrealized gain (loss) on fair value hedging instruments	38	23	77	(225)
Designated as hedging instrument | Fixed-rate automotive loans | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Designated as hedging instrument | Fixed-rate automotive loans | Interest on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Designated as hedging instrument | Fixed-rate automotive loans | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Designated as hedging instrument | Deposit liabilities | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Deposit liabilities | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Deposit liabilities | Interest on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	(2)	(1)	(5)
Designated as hedging instrument | Deposit liabilities | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Variable-rate commercial loans | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	18	22	40	25
Designated as hedging instrument | Variable-rate commercial loans | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Variable-rate commercial loans | Interest on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Variable-rate commercial loans | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Variable-rate commercial borrowings probable not to occur | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	4	0	4	0
Designated as hedging instrument | Variable-rate commercial borrowings probable not to occur | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Variable-rate commercial borrowings probable not to occur | Interest on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Variable-rate commercial borrowings probable not to occur | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	$ 0	$ 0	$ 0	$ 0

Derivative Instruments and He_8

Derivative Instruments and Hedging Activities (Interest and Amortization on Derivative Instruments) (Details) - Designated as hedging instrument - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on fair value hedging relationships	$ (43)	$ (51)	$ (86)	$ (73)
Total gain on cash flow hedging relationships			0	1
Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on fair value hedging relationships	(4)	(4)	(7)	(5)
Total gain on cash flow hedging relationships			0	0
Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on fair value hedging relationships	0	(4)	(3)	(4)
Total gain on cash flow hedging relationships			0	0
Unsecured debt | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge	0	0	0	0
Unsecured debt | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge	0	0	0	0
Unsecured debt | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	1	2	2	8
Gain (loss) on interest for qualifying hedge	2	0	3	0
Federal Home Loan Bank certificates and obligations | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Federal Home Loan Bank certificates and obligations | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Federal Home Loan Bank certificates and obligations | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	(3)	(6)	(8)	(12)
Available-for-sale securities | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge	0	0	0	0
Available-for-sale securities | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	(1)	(2)	(3)	(3)
Gain (loss) on interest for qualifying hedge	(3)	(2)	(4)	(2)
Available-for-sale securities | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge	0	0	0	0
Fixed-rate automotive loans | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	(11)	(13)	(24)	(26)
Gain (loss) on interest for qualifying hedge	(32)	(38)	(62)	(47)
Fixed-rate automotive loans | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge	0	0	0	0
Fixed-rate automotive loans | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge	$ 0	$ 0	0	0
Variable-rate commercial loans | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest for qualifying hedge			0	1
Variable-rate commercial loans | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest for qualifying hedge			0	0
Variable-rate commercial loans | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest for qualifying hedge			$ 0	$ 0

Derivative Instruments and He_9

Derivative Instruments and Hedging Activities (Derivative Instruments Used in Net Investment Hedge Accounting Relationships) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest rate contracts | Cash flow hedging
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) gain recognized in other comprehensive income, cash flow hedge, interest rate contracts	$ (22,000,000)	$ (19,000,000)	$ (43,000,000)	$ 150,000,000
Foreign exchange contracts | Net investment hedging
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) gain recognized in other comprehensive income, net investment hedge, foreign exchange contracts	(3,000,000)	(6,000,000)	(5,000,000)	6,000,000
Amounts excluded from effectiveness testing	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	$ 0	$ 0	$ 0	$ 0

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income tax expense from continuing operations	$ 143	$ 95	$ 354	$ 3
Release of valuation allowance			$ 78
Income tax benefit from discontinued operations	2
Foreign tax credit carryforwards	78
Valuation allowance	$ 76

Fair Value (Fair Value Measurem

Fair Value (Fair Value Measurements - Recurring Basis) (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		$ 1,026	$ 1,071
Debt securities, available-for-sale, fair value	[1]	34,161	29,830
Derivative contracts in a receivable position		11	16
Derivative contracts in a payable position		$ 46	$ 31
Investment in any one industry did not exceed percentage		11.00%	11.00%
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		$ 34,161	$ 29,830
Derivative contracts in a receivable position		16	17
Total assets		35,308	31,017
Derivative contracts in a payable position		47	33
Total liabilities		47	33
Fair value, measurements, recurring | Foreign currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a payable position			1
Fair value, measurements, recurring | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a payable position		46	28
Fair value, measurements, recurring | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a payable position		1	4
Fair value, measurements, recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		1,026	1,071
Fair value, measurements, recurring | U.S. Treasury and federal agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		2,148	803
Fair value, measurements, recurring | U.S. States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		1,024	1,095
Fair value, measurements, recurring | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		184	176
Fair value, measurements, recurring | Agency mortgage-backed residential | Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		20,835	18,588
Fair value, measurements, recurring | Agency mortgage-backed residential | Commercial Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		4,405	4,189
Fair value, measurements, recurring | Mortgage-backed residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		2,910	2,640
Fair value, measurements, recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		555	425
Fair value, measurements, recurring | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		2,100	1,914
Fair value, measurements, recurring | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale, fair value		97	91
Fair value, measurements, recurring | Consumer other | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		8	8
Fair value, measurements, recurring | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a receivable position		9	16
Fair value, measurements, recurring | Foreign currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a receivable position		4	1
Fair value, measurements, recurring | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a receivable position		3
Fair value, measurements, recurring | Fair value, inputs, level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		2,165	820
Derivative contracts in a receivable position		3	0
Total assets		3,185	1,884
Derivative contracts in a payable position		1	4
Total liabilities		1	4
Fair value, measurements, recurring | Fair value, inputs, level 1 | Foreign currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a payable position			0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a payable position		0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a payable position		1	4
Fair value, measurements, recurring | Fair value, inputs, level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		1,017	1,064
Fair value, measurements, recurring | Fair value, inputs, level 1 | U.S. Treasury and federal agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		2,148	803
Fair value, measurements, recurring | Fair value, inputs, level 1 | U.S. States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		17	17
Fair value, measurements, recurring | Fair value, inputs, level 1 | Agency mortgage-backed residential | Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Agency mortgage-backed residential | Commercial Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Mortgage-backed residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Consumer other | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a receivable position		0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Foreign currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a receivable position		0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a receivable position		3
Fair value, measurements, recurring | Fair value, inputs, level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		31,989	29,003
Derivative contracts in a receivable position		4	1
Total assets		31,993	29,004
Derivative contracts in a payable position		0	1
Total liabilities		0	1
Fair value, measurements, recurring | Fair value, inputs, level 2 | Foreign currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a payable position			1
Fair value, measurements, recurring | Fair value, inputs, level 2 | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a payable position		0	0
Fair value, measurements, recurring | Fair value, inputs, level 2 | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a payable position		0	0
Fair value, measurements, recurring | Fair value, inputs, level 2 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		0	0
Fair value, measurements, recurring | Fair value, inputs, level 2 | U.S. Treasury and federal agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 2 | U.S. States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		1,017	1,088
Fair value, measurements, recurring | Fair value, inputs, level 2 | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		167	159
Fair value, measurements, recurring | Fair value, inputs, level 2 | Agency mortgage-backed residential | Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		20,835	18,588
Fair value, measurements, recurring | Fair value, inputs, level 2 | Agency mortgage-backed residential | Commercial Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		4,405	4,189
Fair value, measurements, recurring | Fair value, inputs, level 2 | Mortgage-backed residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		2,910	2,640
Fair value, measurements, recurring | Fair value, inputs, level 2 | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		555	425
Fair value, measurements, recurring | Fair value, inputs, level 2 | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		2,100	1,914
Fair value, measurements, recurring | Fair value, inputs, level 2 | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 2 | Consumer other | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		0	0
Fair value, measurements, recurring | Fair value, inputs, level 2 | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a receivable position		0	0
Fair value, measurements, recurring | Fair value, inputs, level 2 | Foreign currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a receivable position		4	1
Fair value, measurements, recurring | Fair value, inputs, level 2 | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a receivable position		0
Fair value, measurements, recurring | Fair value, inputs, level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		7	7
Derivative contracts in a receivable position		9	16
Total assets		130	129
Derivative contracts in a payable position		46	28
Total liabilities		46	28
Fair value, measurements, recurring | Fair value, inputs, level 3 | Foreign currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a payable position			0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a payable position		46	28
Fair value, measurements, recurring | Fair value, inputs, level 3 | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a payable position		0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		9	7
Fair value, measurements, recurring | Fair value, inputs, level 3 | U.S. Treasury and federal agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | U.S. States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		7	7
Fair value, measurements, recurring | Fair value, inputs, level 3 | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Agency mortgage-backed residential | Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Agency mortgage-backed residential | Commercial Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Mortgage-backed residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, fair value		0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale, fair value		97	91
Fair value, measurements, recurring | Fair value, inputs, level 3 | Consumer other | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		8	8
Fair value, measurements, recurring | Fair value, inputs, level 3 | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a receivable position		9	16
Fair value, measurements, recurring | Fair value, inputs, level 3 | Foreign currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a receivable position		0	$ 0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts in a receivable position		$ 0
[1]	Refer to Note 6 for discussion of investment securities pledged as collateral.

Fair Value (Fair Value Measur_2

Fair Value (Fair Value Measurements - Reconciliation of Level 3 Assets And Liabilities) (Details) - Fair value, measurements, recurring - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative liabilities, net of derivative assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, transfers into (out of) level 3	$ 0	$ 0	$ 0	$ 0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability value, beginning balance	28	(8)	12	(2)
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings	7	(4)	22	(10)
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, purchases	0	0	0	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, sales	0	0	0	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, issuances	2	0	3	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, settlements	0	0	0	0
Fair value, measurement, recurring, asset, transfers into (out of) level 3	0	0	0	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability value, ending balance	37	(12)	37	(12)
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in earnings	10	(4)	25	(10)
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	11	4	7	8
Fair value, measurement, recurring, asset, gain (loss) included in earnings	0	1	4	(3)
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	0	0	0	0
Fair value, measurement, recurring, asset, sales	(2)	0	(2)	0
Fair value, measurement , recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	0	0	0	0
Fair value, measurement, recurring, asset, transfers into (out of) level 3	0	0	0	0
Fair value, measurement, recurring, asset value, ending balance	9	5	9	5
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	0	1	4	(3)
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, transfers into (out of) level 3	0	0	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Available-for-sale securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	7	3	7	2
Fair value, measurement, recurring, asset, gain (loss) included in earnings	0	0	0	0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	0	2	0	3
Fair value, measurement, recurring, asset, sales	0	0	0	0
Fair value, measurement , recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	0	0	0	0
Fair value, measurement, recurring, asset, transfers into (out of) level 3	0	0	0	0
Fair value, measurement, recurring, asset value, ending balance	7	5	7	5
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	0	0	0	0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, transfers into (out of) level 3	0	0	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Mortgage loans held-for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	146	68	91	30
Fair value, measurement, recurring, asset, gain (loss) included in earnings	21	8	49	13
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	812	676	1,851	978
Fair value, measurement, recurring, asset, sales	(882)	(661)	(1,894)	(930)
Fair value, measurement , recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	0	0	0	0
Fair value, measurement, recurring, asset, transfers into (out of) level 3	0	0	0	0
Fair value, measurement, recurring, asset value, ending balance	97	91	97	91
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	1	1	1	2
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, transfers into (out of) level 3	0	0	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Finance receivables and loans, net | Consumer Loan
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	8	10	8	11
Fair value, measurement, recurring, asset, gain (loss) included in earnings	0	1	1	0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	5	3	8	9
Fair value, measurement, recurring, asset, sales	0	0	0	0
Fair value, measurement , recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	(5)	(6)	(9)	(12)
Fair value, measurement, recurring, asset, transfers into (out of) level 3	0	0	0	0
Fair value, measurement, recurring, asset value, ending balance	8	8	8	8
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	0	0	0	0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, transfers into (out of) level 3	0	0	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Interests retained in financial asset sales
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	0	1	0	2
Fair value, measurement, recurring, asset, gain (loss) included in earnings	0	0	0	0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	0	0	0	0
Fair value, measurement, recurring, asset, sales	0	0	0	0
Fair value, measurement , recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	0	0	0	(1)
Fair value, measurement, recurring, asset, transfers into (out of) level 3	0	0	0	0
Fair value, measurement, recurring, asset value, ending balance	0	1	0	1
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	0	0	0	0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, transfers into (out of) level 3	0	0	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	$ 0	$ 0	$ 0	$ 0

Fair Value (Fair Value Measur_3

Fair Value (Fair Value Measurements - Nonrecurring Basis) (Details) - USD ($) $ in Millions	Apr. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		$ 409		$ 409		$ 406
Finance receivables and loans, net		109,091		109,091		115,251
Goodwill impairment		0	$ 50	0	$ 50
Corporate and Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill impairment	$ 50			0
Assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		605		605		530
Lower of cost or fair value, valuation reserve, or cumulative adjustments		144		144		62
Mortgage loans held-for-sale | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		312		312		315
Lower of cost or fair value, valuation reserve, or cumulative adjustments		0		0		0
Nonmarketable equity investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		204		204		125
Lower of cost or fair value, valuation reserve, or cumulative adjustments		170		170		88
Repossessed and foreclosed assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		3		3		9
Lower of cost or fair value, valuation reserve, or cumulative adjustments		0		0		(1)
Fair value, inputs, level 1 | Assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		0		0		0
Fair value, inputs, level 1 | Mortgage loans held-for-sale | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		0		0		0
Fair value, inputs, level 1 | Nonmarketable equity investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		0		0		0
Fair value, inputs, level 1 | Repossessed and foreclosed assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		0		0		0
Fair value, inputs, level 2 | Assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		171		171		7
Fair value, inputs, level 2 | Mortgage loans held-for-sale | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		0		0		0
Fair value, inputs, level 2 | Nonmarketable equity investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		171		171		7
Fair value, inputs, level 2 | Repossessed and foreclosed assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		0		0		0
Fair value, inputs, level 3 | Assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		434		434		523
Fair value, inputs, level 3 | Mortgage loans held-for-sale | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		312		312		315
Fair value, inputs, level 3 | Nonmarketable equity investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		33		33		118
Fair value, inputs, level 3 | Repossessed and foreclosed assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		3		3		9
Commercial | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		86		86		81
Lower of cost or fair value, valuation reserve, or cumulative adjustments		(26)		(26)		(25)
Commercial | Fair value, inputs, level 1 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		0		0		0
Commercial | Fair value, inputs, level 2 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		0		0		0
Commercial | Fair value, inputs, level 3 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		86		86		81
Automotive loan | Commercial | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		27		27		27
Lower of cost or fair value, valuation reserve, or cumulative adjustments		(2)		(2)		(5)
Automotive loan | Commercial | Fair value, inputs, level 1 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		0		0		0
Automotive loan | Commercial | Fair value, inputs, level 2 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		0		0		0
Automotive loan | Commercial | Fair value, inputs, level 3 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		27		27		27
Consumer other | Commercial | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		59		59		54
Lower of cost or fair value, valuation reserve, or cumulative adjustments		(24)		(24)		(20)
Consumer other | Commercial | Fair value, inputs, level 1 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		0		0		0
Consumer other | Commercial | Fair value, inputs, level 2 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		0		0		0
Consumer other | Commercial | Fair value, inputs, level 3 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net		$ 59		$ 59		$ 54

Fair Value (Fair Value, by Bala

Fair Value (Fair Value, by Balance Sheet Grouping) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	$ 1,126	$ 1,253
Loans held-for-sale, net	409	406
Finance receivables and loans, net	109,091	115,251
Deposit liabilities	139,104	137,036
Short-term borrowings	0	2,136
Long-term debt	16,896	22,006
Carrying value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	1,126	1,253
Loans held-for-sale, net	312	315
Finance receivables and loans, net	109,083	115,243
FHLB/FRB stock	688	725
Deposit liabilities	47,253	55,210
Short-term borrowings		2,136
Long-term debt	16,896	22,006
Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	1,173	1,331
Loans held-for-sale, net	312	315
Finance receivables and loans, net	116,169	122,156
FHLB/FRB stock	688	725
Deposit liabilities	47,675	55,932
Short-term borrowings		2,136
Long-term debt	19,734	25,471
Estimated fair value | Fair value, inputs, level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	0	0
Loans held-for-sale, net	0	0
Finance receivables and loans, net	0	0
FHLB/FRB stock	0	0
Deposit liabilities	0	0
Short-term borrowings		0
Long-term debt	0	0
Estimated fair value | Fair value, inputs, level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	1,173	1,331
Loans held-for-sale, net	0	0
Finance receivables and loans, net	0	0
FHLB/FRB stock	688	725
Deposit liabilities	0	0
Short-term borrowings		0
Long-term debt	14,250	19,161
Estimated fair value | Fair value, inputs, level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	0	0
Loans held-for-sale, net	312	315
Finance receivables and loans, net	116,169	122,156
FHLB/FRB stock	0	0
Deposit liabilities	47,675	55,932
Short-term borrowings		2,136
Long-term debt	$ 5,484	$ 6,310

Offsetting Assets and Liabili_3

Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Offsetting [Abstract]
Derivative asset, Gross amounts of recognized assets/liabilities	$ 7	$ 1
Derivative asset, Gross amounts offset on the Condensed Consolidated Balance Sheet	0	0
Net amounts of assets presented on the Consolidated Balance Sheet	7	1
Derivative asset, Gross amounts not offset on the Condensed Consolidated Balance Sheet, Financial instruments	(1)	(1)
Derivative asset, Gross amounts not offset on the Condensed Consolidated Balance Sheet, Collateral	(4)	0
Derivative assets, Net amount	2	0
Derivative assets with no offsetting arrangements	9	16
Total assets, Gross amounts of recognized assets/liabilities	16	17
Total assets, Net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet	16	17
Total assets, Net amount	11	16
Derivative liabilities, Gross amounts of recognized assets/liabilities	1	5
Derivative liabilities, Gross amounts offset on the Condensed Consolidated Balance Sheet	0	0
Net amounts of liabilities presented on the Consolidated Balance Sheet	1	5
Derivative liabilities, Gross amounts not offset on the Condensed Consolidated Balance Sheet, Financial instruments	(1)	(1)
Derivative liabilities, Gross amounts not offset on the Condensed Consolidated Balance Sheet, Collateral	0	(1)
Derivative liabilities, Net amount	0	3
Derivative liabilities with no offsetting arrangements	46	28
Total liabilities, Gross amounts of recognized assets/liabilities	47	33
Total liabilities, Net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet	47	33
Total liabilities, Net amount	$ 46	$ 31

Segment Information (Details)

Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)segment	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			4
Net financing revenue and other interest income	$ 1,547	$ 1,054	$ 2,919	$ 2,200
Other revenue	538	555	1,103	821
Total net revenue	2,085	1,609	4,022	3,021
Provision for credit losses	(32)	287	(45)	1,190
Total noninterest expense	1,075	985	2,018	1,905
Income (loss) from continuing operations before income tax expense	1,042	337	2,049	(74)
Total assets	180,470	184,061	180,470	184,061	$ 182,165
Net financing revenue and other interest income after the provision for credit losses	1,600	767	3,000	1,000
Operating Segments | Automotive Finance operations
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	1,333	989	2,539	2,029
Other revenue	61	40	123	87
Total net revenue	1,394	1,029	2,662	2,116
Provision for credit losses	(23)	256	(45)	1,022
Total noninterest expense	500	444	987	938
Income (loss) from continuing operations before income tax expense	917	329	1,720	156
Total assets	100,162	102,016	100,162	102,016
Operating Segments | Insurance operations
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	15	12	30	26
Other revenue	344	438	723	575
Total net revenue	359	450	753	601
Provision for credit losses	0	0	0	0
Total noninterest expense	272	322	525	578
Income (loss) from continuing operations before income tax expense	87	128	228	23
Total assets	9,394	8,740	9,394	8,740
Operating Segments | Mortgage Finance operations
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	23	30	46	68
Other revenue	22	19	62	29
Total net revenue	45	49	108	97
Provision for credit losses	0	3	(4)	4
Total noninterest expense	45	38	89	73
Income (loss) from continuing operations before income tax expense	0	8	23	20
Total assets	13,865	16,669	13,865	16,669
Operating Segments | Corporate Finance operations
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	77	77	148	145
Other revenue	33	6	59	19
Total net revenue	110	83	207	164
Provision for credit losses	(13)	25	0	139
Total noninterest expense	28	26	59	61
Income (loss) from continuing operations before income tax expense	95	32	148	(36)
Total assets	6,246	6,206	6,246	6,206
Corporate and Other
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	99	(54)	156	(68)
Other revenue	78	52	136	111
Total net revenue	177	(2)	292	43
Provision for credit losses	4	3	4	25
Total noninterest expense	230	155	358	255
Income (loss) from continuing operations before income tax expense	(57)	(160)	(70)	(237)
Total assets	$ 50,803	$ 50,430	$ 50,803	$ 50,430

Contingencies and Other Risks (

Contingencies and Other Risks (Details) $ in Millions	Jun. 30, 2021USD ($)
Loss Contingency [Abstract]
Loss contingency, estimate of possible loss	$ 87.5
Charged-off deficiency balance	$ 700

Subsequent Events (Details)

Subsequent Events (Details) - USD ($)		Jul. 12, 2021	Jul. 02, 2021	Jun. 02, 2021	Apr. 22, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jan. 11, 2021
Subsequent Event [Line Items]
Cash dividends declared per common share (in dollars per share)	[1],[2]					$ 0.19	$ 0.19	$ 0.38	$ 0.38
Trust preferred securities redemption								$ 1,442,000,000	$ 0
Preferred stock issuance								$ 2,326,000,000	$ 0
Common stock
Subsequent Event [Line Items]
Cash dividends declared per common share (in dollars per share)						$ 0.19
Stock repurchase program, authorized amount										$ 1,600,000,000
Trust Preferred Securities Subject to Mandatory Redemption
Subsequent Event [Line Items]
Trust preferred securities redemption					$ 1,400,000,000
Debt redeemed during period, number of shares					56,000,000
Series C Preferred Stock
Subsequent Event [Line Items]
Preferred stock issuance				$ 1,000,000,000
Subsequent event | Common stock
Subsequent Event [Line Items]
Dividends payable, date declared		Jul. 12, 2021
Cash dividends declared per common share (in dollars per share)		$ 0.25
Dividends payable, date to be paid		Aug. 16, 2021
Dividends payable, date of record		Aug. 2, 2021
Stock repurchase program, authorized amount		$ 2,000,000,000
Subsequent event | Trust Preferred Securities Subject to Mandatory Redemption
Subsequent Event [Line Items]
Trust preferred securities redemption			$ 1,040,000,000
Debt redeemed during period, number of shares			41,600,000
[1]	Due to the antidilutive effect of the net loss from continuing operations for the six months ended June 30, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share.
[2]	Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.

Uncategorized Items - ally-2021

Label	Element	Value
Accounting Standards Update [Extensible List]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]