Chubb Limited (CB) 10-Q10 May 162016 Q1 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2016	Apr. 22, 2016
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Trading Symbol	CB
Entity Registrant Name	Chubb Ltd
Entity Central Index Key	896,159
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Common Shares Outstanding		464,478,489

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2016		Dec. 31, 2015
Investments [Abstract]
Fixed maturities available for sale, at fair value (amortized cost - $75,991 and $43,149) (includes hybrid financial instruments of $3 and $31)		$ 77,538		$ 43,587
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)		11,280		8,430
Equity securities, at fair value (cost – $841 and $441)		893		497
Short-term investments, at fair value and amortized cost		3,382		10,446
Other investments (cost – $4,233 and $2,993)		4,493		3,291
Total investments		97,586		66,251
Cash	[1]	1,091	[2]	1,775	[3]
Securities lending collateral		1,003		1,046
Accrued investment income		891		513
Insurance and reinsurance balances receivable		7,692		5,323
Reinsurance recoverable on losses and loss expenses		12,891		11,386
Reinsurance recoverable on policy benefits		185		187
Deferred policy acquisition costs		3,376		2,873
Value of business acquired		390		395
Goodwill		15,404		4,796
Other intangible assets		7,955		887
Prepaid reinsurance premiums		2,376		2,082
Deferred tax assets		0		318
Investments in partially-owned insurance companies		654		653
Other assets		5,150		3,821
Total assets		156,644		102,306
Liabilities
Unpaid losses and loss expenses		60,206		37,303
Unearned premiums		14,896		8,439
Future policy benefits		4,869		4,807
Insurance and reinsurance balances payable		4,733		4,270
Securities lending payable		1,004		1,047
Accounts payable, accrued expenses, and other liabilities		9,050		6,205
Deferred Tax Liabilities, Net		1,142		0
Short-term debt		500		0
Long-term debt		12,636		9,389
Trust preferred securities		308		307
Repurchase Agreements		1,403		1,404
Total liabilities		$ 110,747		$ 73,171
Commitments and contingencies
Shareholders’ equity
Common Shares (CHF 24.15 par value; 479,783,864 and 342,832,412 shares issued; 464,283,520 and 324,563,441 shares outstanding)		$ 11,121		$ 7,833
Common Shares in treasury (15,500,344 and 18,268,971 shares)		(1,648)		(1,922)
Additional paid-in capital		16,140		4,481
Retained earnings		19,917		19,478
Accumulated other comprehensive income (loss) (AOCI)		367		(735)
Total shareholders’ equity		45,897		29,135
Total liabilities and shareholders’ equity		$ 156,644		$ 102,306

[1]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 and December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) $ in Millions	Mar. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)shares
Statement of Financial Position [Abstract]
Fixed maturities available for sale, at amortized cost	$ 75,991	$ 43,149
Fixed maturities available for sale, hybrid financial instruments	3	31
Fixed maturities held to maturity, at amortized cost	11,580	8,552
Equity securities, at cost	841	441
Other investments, cost	$ 4,233	$ 2,993
Common Shares, shares issued \| shares	479,783,864	342,832,412
Common Shares, shares outstanding \| shares	464,283,520	324,563,441
Common Shares in treasury, shares \| shares	15,500,344	18,268,971

Consolidated Statements Of Oper

Consolidated Statements Of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues
Net premiums written	$ 5,995	$ 4,076
Decrease (increase) in unearned premiums	602	(149)
Net premiums earned	6,597	3,927
Net investment income	674	551
Net realized gains (losses):
Other-than-temporary impairment (OTTI) losses gross	(71)	(13)
Portion of OTTI losses recognized in other comprehensive income (OCI)	8	0
Net OTTI losses recognized in income	(63)	(13)
Net realized gains (losses) excluding OTTI losses	(331)	(76)
Total net realized gains (losses) (includes $(152) and $(3) reclassified from AOCI)	(394)	(89)
Total revenues	6,877	4,389
Expenses
Losses and loss expenses	3,674	2,122
Policy benefits	126	142
Policy acquisition costs	1,413	707
Administrative expenses	772	554
Interest expense	146	68
Other (income) expense	28	(35)
Amortization of purchased intangibles	7	30
Chubb integration expenses	148	0
Total expenses	6,314	3,588
Income before income tax	563	801
Income tax (benefits) expense (includes $(1) and $4 on reclassified unrealized gains and losses)	124	120
Net income	439	681
Other comprehensive income (loss)
Unrealized appreciation	905	441
Reclassification adjustment for net realized losses included in net income	152	3
Unrealized appreciation (Depreciation) after reclassification adjustment	1,057	444
Change in:
Cumulative translation adjustment	312	(421)
Pension liability	2	13
Other comprehensive income, before income tax	1,371	36
Income tax expense related to OCI items	(269)	(75)
Other comprehensive income (loss)	1,102	(39)
Comprehensive income	$ 1,541	$ 642
Earnings per share
Basic earnings per share	$ 0.98	$ 2.08
Diluted earnings per share	$ 0.97	$ 2.05
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Net realized gains (losses):
Total net realized gains (losses) (includes $(152) and $(3) reclassified from AOCI)	$ (152)	$ (3)
Expenses
Income tax (benefits) expense (includes $(1) and $4 on reclassified unrealized gains and losses)	$ (1)	$ 4

Consolidated Statements Of Ope5

Consolidated Statements Of Operations and Comprehensive Income Consolidated Statements of Operations and Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income tax expense	$ 124	$ 120
Net realized gains (losses)	(394)	(89)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Income tax expense	(1)	4
Net realized gains (losses)	$ (152)	$ (3)

Consolidated Statements Of Shar

Consolidated Statements Of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Common Stock [Member]The Chubb Corporation [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]The Chubb Corporation [Member]	Retained Earnings [Member]	Accumulated Net Unrealized Investment Gain (Loss) [Member]	Accumulated Translation Adjustment [Member]	Accumulated Defined Benefit Plans Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance - beginning of period at Dec. 31, 2014		$ 8,055		$ (1,448)	$ 5,145		$ 16,644	$ 1,851	$ (581)	$ (79)
Dividends declared on Common Shares – par value reduction		(222)
Net shares redeemed under employee share-based compensation plans				143	(153)	$ 0
Shares Issued for Chubb Corp Acquisition			$ 0			0
Common Shares repurchased				(340)
Exercise of stock options					(18)
Share-based compensation expense and other					63
Funding of dividends declared to Retained earnings					0
Net income	$ 681						681
Funding of dividends declared from Additional paid-in capital							0
Dividends declared on Common Shares							0
Change in period, before reclassification from AOCI, net of income tax expense of $(232) and $(87)								354
Amounts reclassified from AOCI, net of income tax benefit (expense) of $(1) and $4								7
Change in period, net of income tax expense of $(233) and $(83)								361
Change in period, net of income tax benefit (expense) of $(35) and $11									(410)
Change in period, net of income tax benefit (expense) of $(1) and $(3)										10
Balance - end of period at Mar. 31, 2015	29,702	7,833		(1,645)	5,037		17,325	2,212	(991)	(69)	$ 1,152
Balance - beginning of period at Dec. 31, 2015	29,135	7,833		(1,922)	4,481		19,478	874	(1,539)	(70)
Dividends declared on Common Shares – par value reduction		0
Net shares redeemed under employee share-based compensation plans				274	(310)	323
Shares Issued for Chubb Corp Acquisition			$ 3,288			$ 11,916
Common Shares repurchased				0
Exercise of stock options					(21)
Share-based compensation expense and other					65
Funding of dividends declared to Retained earnings					(314)
Net income	439						439
Funding of dividends declared from Additional paid-in capital							314
Dividends declared on Common Shares							(314)
Change in period, before reclassification from AOCI, net of income tax expense of $(232) and $(87)								673
Amounts reclassified from AOCI, net of income tax benefit (expense) of $(1) and $4								151
Change in period, net of income tax expense of $(233) and $(83)								824
Change in period, net of income tax benefit (expense) of $(35) and $11									277
Change in period, net of income tax benefit (expense) of $(1) and $(3)										1
Balance - end of period at Mar. 31, 2016	$ 45,897	$ 11,121		$ (1,648)	$ 16,140		$ 19,917	$ 1,698	$ (1,262)	$ (69)	$ 367

Consolidated Statements Of Sha7

Consolidated Statements Of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net unrealized appreciation on investments, Change in period, income tax (expense) benefit	$ (233)	$ (83)
Cumulative translation adjustment, Change in period, income tax(expense) benefit	(35)	11
Pension liability adjustment, Change in period, income tax (expense) benefit	(1)	(3)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	(234)	(87)
Income tax benefit (expense) from reclassification of unrealized gains	$ 1	$ 4

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015
Cash flows from operating activities
Net income	$ 439		$ 681
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	394		89
Amortization of premiums/discounts on fixed maturities	174		36
Deferred income taxes	(42)		7
Unpaid losses and loss expenses	(72)		(320)
Unearned premiums	(616)		212
Future policy benefits	28		48
Insurance and reinsurance balances payable	(15)		158
Accounts payable, accrued expenses, and other liabilities	(34)		(46)
Income taxes payable	143		20
Insurance and reinsurance balances receivable	601		240
Reinsurance recoverable on losses and loss expenses	194		185
Reinsurance recoverable on policy benefits	3		2
Deferred policy acquisition costs	(480)		(128)
Prepaid reinsurance premiums	14		(32)
Other	289		(77)
Net cash flows from operating activities	1,020		1,075
Cash flows from investing activities
Purchases of fixed maturities available for sale	(8,104)		(4,305)
Purchases of to be announced mortgage-backed securities	0		(31)
Purchases of fixed maturities held to maturity	(77)		(21)
Purchases of equity securities	(33)		(39)
Sales of fixed maturities available for sale	6,329		2,002
Sales of equity securities	761		28
Maturities and redemptions of fixed maturities available for sale	1,553		1,481
Maturities and redemptions of fixed maturities held to maturity	249		324
Net change in short-term investments	11,932		(255)
Net derivative instruments settlements	(22)		(51)
Payments to Acquire Businesses, Net of Cash Acquired	(14,262)		0
Other	59		(153)
Net cash flows used for investing activities	(1,615)		(1,020)
Cash flows from financing activities
Dividends paid on Common Shares	(218)		(214)
Common Shares repurchased	0		(347)
Proceeds from issuance of long-term debt	0		800
Proceeds from issuance of repurchase agreements	853		477
Repayments of Long-term Debt	853
Repayment of repurchase agreements	(853)		(477)
Proceeds from share-based compensation plans, including windfall tax benefits	51		39
Policyholder contract deposits	118		101
Policyholder contract withdrawals	(49)		(40)
Other	(4)		(6)
Net cash flows (used for) from financing activities	(102)		333
Effect of foreign currency rate changes on cash and cash equivalents	13		(95)
Net (decrease) increase in cash	(684)		293
Cash – beginning of period	1,775	[1],[2]	655	[3]
Cash – end of period	1,091	[2],[4]	948	[3]
Supplemental cash flow information
Taxes paid	106		96
Interest paid	$ 71		$ 48

[1]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 and December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3]	maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[4]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Consolidated Statements of Cas9

Consolidated Statements of Cash Flows (Parentheticals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Cash Flows [Abstract]
Cash Acquired from Acquisition	$ 57	$ 0

General

General	3 Months Ended
General	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General a) Basis of presentation On January 14, 2016, we completed the acquisition of The Chubb Corporation (Chubb Corp acquisition), creating a global leader in property and casualty insurance. We have changed our name from ACE Limited to Chubb Limited and plan to adopt the Chubb name globally, although some subsidiaries may continue to use ACE as a part of their name. Chubb Limited is a holding company incorporated in Zurich, Switzerland. Chubb Limited, through its subsidiaries, provides a broad range of insurance and reinsurance products to insureds worldwide. Effective the first quarter of 2016, our results are reported through the following business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. This reflects our significantly larger and expanded operations subsequent to our acquisition of The Chubb Corporation (Chubb Corp). We have also redefined Corporate to include all run-off asbestos and environmental (A&E) exposures, the results of its run-off Brandywine business, the results of Westchester specialty operations for 1996 and prior years and certain mass tort exposures. Prior period amounts of Chubb Limited (i.e., excluding the historical results of Chubb Corp) contained in this report have been adjusted to conform to the new segment presentation. Refer to Note 12 for additional information. The interim unaudited consolidated financial statements, which include the accounts of Chubb Limited and its subsidiaries (collectively, Chubb, we, us, or our), have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) and, in the opinion of management, reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of the results and financial position for such periods. All significant intercompany accounts and transactions, including internal reinsurance transactions, have been eliminated. The results of operations and cash flows of Chubb Corp are included from the acquisition date forward (i.e., after January 14, 2016). The results of operations and cash flows for any interim period are not necessarily indicative of the results for the full year. These consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in our 2015 Form 10-K. b) Accounting guidance adopted in 2016 Presentation of Debt Issuance Costs In April 2015, the Financial Accounting Standard Board (FASB) issued new guidance related to the accounting for debt issuance costs. The new guidance requires presentation of debt issuance costs in the Consolidated balance sheets as a reduction of the carrying amount of the related debt liability instead of as a deferred charge. We retrospectively adopted this guidance effective January 1, 2016 and reclassified $ 60 million of debt issuance costs from Other assets to Long term debt ($ 58 million ) and Trust preferred securities ($ 2 million ) as of December 31, 2015. c) Accounting guidance not yet adopted Revenue from Contracts with Customers In May 2014, the FASB issued an accounting standard that supersedes most existing revenue recognition guidance. The standard excludes from its scope the accounting for insurance contracts, leases, financial instruments, and certain other agreements that are governed under other GAAP guidance, but could affect the revenue recognition for certain of our claims management and risk control services. The updated guidance requires an entity to recognize revenue as performance obligations are met, in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity is entitled to receive for those goods or services. The standard is effective for us in the first quarter of 2018 with early adoption permitted. The adoption of this guidance is not expected to have a material impact on our financial condition or results of operations. Short-Duration Contracts In May 2015, the FASB issued guidance that requires additional disclosures for short-duration insurance contracts. New disclosure will be required to provide more information about initial claim estimates and subsequent adjustments to those estimates, the methodologies and judgments used to estimate claims, and the timing, frequency, and severity of claims. The guidance is effective for us beginning with our 2016 annual reporting on Form 10-K. The guidance requires a change in disclosure only and adoption of this guidance will not have an impact on our financial condition or results of operations.

Acquisitions

Acquisitions	3 Months Ended
Acquisitions	Mar. 31, 2016
Business Combinations [Abstract]
Acquisitions	Acquisitions The Chubb Corporation On January 14, 2016, we completed the acquisition of The Chubb Corporation (Chubb Corp acquisition), a leading provider of middle-market commercial, specialty, surety, and personal insurance for $29.5 billion , comprising $14.3 billion in cash and $15.2 billion in newly-issued stock, based on the Chubb Limited (formerly ACE Limited) closing price on the acquisition date. In addition, we assumed outstanding equity awards to employees and directors with an attributed value of approximately $323 million . The total consideration, including the assumption of equity awards, was $29.8 billion. We financed the cash portion of the transaction through a combination of $9.0 billion sourced from various Chubb Limited and Chubb Corp companies plus $5.3 billion of senior notes, which were issued in November 2015. Refer to Note 7 for additional information on the senior notes . Upon completion of the merger, each Chubb Corp common share (other than shares held by certain legacy Chubb Corp employee benefit plans) was canceled and converted, in accordance with the procedures set forth in the merger agreement, into the right to receive (i) 0.6019 of a Chubb Limited common share and (ii) $62.93 in cash. In addition, replacement equity awards were issued by Chubb Limited to the holders of Chubb Corp's outstanding equity awards (stock options, restricted stock units, deferred stock units, deferred unit obligations, and performance units). We believe the Chubb Corp acquisition is highly complementary to our existing business lines, distribution channels, customer segments and underwriting skills. The Chubb Corp had a substantial presence in the U.S. with a broad variety of coverages serving large corporate and upper middle market accounts, middle market and small commercial accounts, and personal lines. Together we are one of the largest commercial insurers in the U.S. Internationally, where legacy ACE is a truly global insurer with extensive presence in 54 countries, Chubb Corp's operations in 25 markets are expected to add to our presence and capabilities and position us to better pursue important market opportunities globally. The combined company is expected to be a leader in a number of global specialty and traditional products such as professional lines, risk management, workers' compensation, accident and health (A&H), and other property and general casualty lines. The table below details the purchase consideration and preliminary allocation of assets acquired and liabilities assumed. The fair values listed below are preliminary estimates and are subject to adjustment, including assessment of the net realizable value for Reinsurance recoverables on losses and loss expenses and Insurance and reinsurance balances receivables and certain components of the Deferred tax liabilities. While they are not expected to be materially different than those shown, any material adjustments to the estimates will be reflected, retroactively, as of the date of the acquisition. (in millions, except per share data) Purchase consideration Chubb Limited common shares Chubb Corp common shares outstanding 228 Per share exchange ratio 0.6019 Common shares issued by Chubb Limited 137 Common share price of Chubb Limited at January 14, 2016 $ 111.02 Fair value of common shares issued by Chubb Limited to common shareholders of Chubb Corp $ 15,204 Cash consideration Chubb Corp common shares outstanding 228 Agreed cash price per share paid to common shareholders of Chubb Corp $ 62.93 Cash consideration paid by Chubb Limited to common shareholders of Chubb Corp $ 14,319 Stock-based awards Fair value of equity awards issued (1) $ 323 Fair value of purchase consideration $ 29,846 Preliminary estimate of assets acquired and (liabilities) assumed Cash $ 57 Investments 42,869 Accrued investment income 337 Insurance and reinsurance balances receivable 2,948 Reinsurance recoverable on losses and loss expenses 1,657 Indefinite lived intangible assets 2,860 Finite lived intangible assets 4,795 Prepaid reinsurance premiums 280 Other assets 989 Unpaid losses and loss expenses (22,878 ) Unearned premium (7,016 ) Insurance and reinsurance balances payable (468 ) Accounts payable, accrued expenses, and other liabilities (1,919 ) Deferred tax liabilities (1,350 ) Long-term debt (3,760 ) Total identifiable net assets acquired 19,401 Goodwill 10,445 Purchase price $ 29,846 (1) The estimated fair value of the replacement equity awards was $525 million, of which $323 million was attributed to service periods prior to the acquisition and was included in the purchase consideration. Refer to Note 10 for further information on these replacement equity awards. Direct costs related to the Chubb Corp acquisition were expensed as incurred. Chubb integration expenses were $ 148 million for the three months ended March 31, 2016 and include all internal and external costs directly related to the integration activities of the Chubb Corp acquisition, primarily personnel-related expenses including severance, retention and relocation; consulting fees; and advisor fees. We recognized goodwill of $10.4 billion, attributable to expected growth and profitability, none of which is expected to be deductible for income tax purposes, indefinite lived intangible assets of $2.9 billion and other intangible assets of $4.8 billion, which will be amortized over their estimated useful lives, ranging from one to 24 years. Refer to Note 6 for additional information. The following table summarizes the results of the acquired Chubb Corp operations since the acquisition date that have been included within our consolidated statements of income: (in millions of U.S. dollars) January 14, 2016 to March 31, 2016 Total revenues $ 2,487 Net income $ 255 The results of the Chubb Corp have been included in our unaudited consolidated financial statements from the acquisition date to March 31, 2016. The following table provides supplemental unaudited pro forma consolidated information for the three months ended March 31, 2016 and 2015, as if Chubb Corp had been acquired as of January 1, 2015. The unaudited pro forma consolidated financial statements are presented solely for informational purposes and are not necessarily indicative of the consolidated results of operations that might have been achieved had the transaction been completed as of the date indicated, nor are they meant to be indicative of any anticipated consolidated future results of operations that the combined company will experience after the transaction. Three Months Ended March 31 (in millions of U.S. dollars, except per share data) 2016 2015 Total revenues $ 7,322 $ 7,695 Net income $ 534 $ 959 Earnings per share Basic earnings per share $ 1.14 $ 2.05 Diluted earnings per share $ 1.14 $ 2.03 Prior year acquisition Fireman's Fund Insurance Company High Net Worth Personal Lines Insurance Business in the U.S. (Fireman's Fund) On April 1, 2015, we acquired the Fireman's Fund Insurance Company high net worth personal lines insurance business in the U.S., which included the renewal rights for new and existing business and reinsurance of all existing reserves for $365 million in cash. We acquired assets with a fair value of $ 753 million , consisting primarily of cash of $ 629 million and insurance and reinsurance balances receivable of $ 124 million . We assumed liabilities with a fair value of $ 863 million , consisting primarily of unpaid losses and loss expenses of $ 417 million and unearned premiums of $ 428 million . This acquisition generated $ 196 million of goodwill, attributable to expected growth and profitability, all of which is expected to be deductible for income tax purposes, and other intangible assets of $ 278 million , primarily related to renewal rights, based on Chubb’s purchase price allocation. During the third quarter of 2015, we applied the new measurement-period adjustment guidance and recorded an adjustment to the valuation of our other intangible assets. The acquisition expanded our position in the high net worth personal lines insurers in the U.S. The Fireman’s Fund business was integrated into our existing high net worth personal lines business, offering a broad range of coverage including homeowners, automobile, umbrella and excess liability, collectibles and yachts. Goodwill and other intangible assets arising from this acquisition are included in our North America Personal P&C Insurance segment. The consolidated financial statements include results of acquired businesses from the acquisition dates.

Investments

Investments	3 Months Ended
Investments	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Investments	Investments a) Fixed maturities March 31, 2016 Amortized Cost Gross Unrealized Appreciation Gross Unrealized Depreciation Fair Value OTTI Recognized in AOCI (in millions of U.S. dollars) Available for sale U.S. Treasury and agency $ 2,984 $ 85 $ — $ 3,069 $ — Foreign 20,026 685 (118 ) 20,593 (16 ) Corporate securities 21,783 640 (212 ) 22,211 (21 ) Mortgage-backed securities 11,766 289 (10 ) 12,045 (1 ) States, municipalities, and political subdivisions 19,432 200 (12 ) 19,620 — $ 75,991 $ 1,899 $ (352 ) $ 77,538 $ (38 ) Held to maturity U.S. Treasury and agency $ 700 $ 23 $ — $ 723 $ — Foreign 749 38 (4 ) 783 — Corporate securities 2,951 98 (16 ) 3,033 — Mortgage-backed securities 1,652 65 (1 ) 1,716 — States, municipalities, and political subdivisions 5,228 99 (2 ) 5,325 — $ 11,280 $ 323 $ (23 ) $ 11,580 $ — December 31, 2015 Amortized Cost Gross Unrealized Appreciation Gross Unrealized Depreciation Fair Value OTTI Recognized in AOCI (in millions of U.S. dollars) Available for sale U.S. Treasury and agency $ 2,481 $ 52 $ (5 ) $ 2,528 $ — Foreign 13,190 468 (213 ) 13,445 (13 ) Corporate securities 15,028 355 (454 ) 14,929 (28 ) Mortgage-backed securities 9,827 183 (52 ) 9,958 (1 ) States, municipalities, and political subdivisions 2,623 110 (6 ) 2,727 — $ 43,149 $ 1,168 $ (730 ) $ 43,587 $ (42 ) Held to maturity U.S. Treasury and agency $ 733 $ 13 $ (1 ) $ 745 $ — Foreign 763 30 (8 ) 785 — Corporate securities 3,054 57 (55 ) 3,056 — Mortgage-backed securities 1,707 38 (2 ) 1,743 — States, municipalities, and political subdivisions 2,173 52 (2 ) 2,223 — $ 8,430 $ 190 $ (68 ) $ 8,552 $ — As discussed in Note 3 c ), if a credit loss is incurred on an impaired fixed maturity, an OTTI is considered to have occurred and the portion of the impairment not related to credit losses (non-credit OTTI) is recognized in OCI. Included in the “OTTI Recognized in AOCI” columns above are the cumulative amounts of non-credit OTTI recognized in OCI adjusted for subsequent sales, maturities, and redemptions. OTTI recognized in AOCI does not include the impact of subsequent changes in fair value of the related securities. In periods subsequent to a recognition of OTTI in OCI, changes in the fair value of the related fixed maturities are reflected in Unrealized appreciation (depreciation) in the consolidated statement of shareholders’ equity. For the three months ended March 31, 2016 and 2015, $23 million and $4 million , respectively, of net unrealized appreciation related to such securities is included in OCI. At March 31, 2016 and December 31, 2015 , AOCI included cumulative net unrealized depreciation of $24 million and $35 million, respectively, related to securities remaining in the investment portfolio for which a non-credit OTTI was recognized. Mortgage-backed securities (MBS) issued by U.S. government agencies are combined with all other to be announced mortgage derivatives held (refer to Note 8 c) (iv)) and are included in the category, “Mortgage-backed securities.” Approximately 77 percent and 81 percent of the total mortgage-backed securities at March 31, 2016 and December 31, 2015 , respectively, are represented by investments in U.S. government agency bonds. The remainder of the mortgage exposure consists of collateralized mortgage obligations and non-government mortgage-backed securities, the majority of which provide a planned structure for principal and interest payments and carry a rating of AAA by the major credit rating agencies. The following table presents fixed maturities by contractual maturity: March 31 December 31 2016 2015 (in millions of U.S. dollars) Amortized Cost Fair Value Amortized Cost Fair Value Available for sale Due in 1 year or less $ 3,712 $ 3,724 $ 1,856 $ 1,865 Due after 1 year through 5 years 25,064 25,492 14,936 15,104 Due after 5 years through 10 years 25,453 25,887 12,258 12,173 Due after 10 years 9,996 10,390 4,272 4,487 64,225 65,493 33,322 33,629 Mortgage-backed securities 11,766 12,045 9,827 9,958 $ 75,991 $ 77,538 $ 43,149 $ 43,587 Held to maturity Due in 1 year or less $ 425 $ 429 $ 492 $ 495 Due after 1 year through 5 years 2,505 2,597 2,443 2,517 Due after 5 years through 10 years 2,918 2,991 2,292 2,313 Due after 10 years 3,780 3,847 1,496 1,484 9,628 9,864 6,723 6,809 Mortgage-backed securities 1,652 1,716 1,707 1,743 $ 11,280 $ 11,580 $ 8,430 $ 8,552 Expected maturities could differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties. b) Equity securities March 31 December 31 (in millions of U.S. dollars) 2016 2015 Cost $ 841 $ 441 Gross unrealized appreciation 84 74 Gross unrealized depreciation (32 ) (18 ) Fair value $ 893 $ 497 c ) Net realized gains (losses) In accordance with guidance related to the recognition and presentation of OTTI, when an impairment related to a fixed maturity has occurred, OTTI is required to be recorded in Net income if management has the intent to sell the security or it is more likely than not that we will be required to sell the security before the recovery of its amortized cost. Further, in cases where we do not intend to sell the security and it is more likely than not that we will not be required to sell the security, Chubb must evaluate the security to determine the portion of the impairment, if any, related to credit losses. If a credit loss is incurred, an OTTI is considered to have occurred and any portion of the OTTI related to credit losses must be reflected in Net income while the portion of OTTI related to all other factors is recognized in OCI. For fixed maturities held to maturity, OTTI recognized in OCI is accreted from AOCI to the amortized cost of the fixed maturity prospectively over the remaining term of the securities. Each quarter, securities in an unrealized loss position (impaired securities), including fixed maturities, securities lending collateral, equity securities, and other investments, are reviewed to identify impaired securities to be specifically evaluated for a potential OTTI. For all non-fixed maturities, OTTI is evaluated based on the following: • the amount of time a security has been in a loss position and the magnitude of the loss position; • the period in which cost is expected to be recovered, if at all, based on various criteria including economic conditions and other issuer-specific developments; and • Our ability and intent to hold the security to the expected recovery period. As a general rule, we also consider that equity securities in an unrealized loss position for twelve consecutive months are other than temporarily impaired. For mutual funds included in equity securities in our consolidated balance sheet, we employ analysis similar to fixed maturities, when applicable. We review each fixed maturity in an unrealized loss position to assess whether the security is a candidate for credit loss. Specifically, we consider credit rating, market price, and issuer-specific financial information, among other factors, to assess the likelihood of collection of all principal and interest as contractually due. Securities for which we determine that credit loss is likely are subjected to further analysis to estimate the credit loss recognized in Net income, if any. In general, credit loss recognized in Net income equals the difference between the security’s amortized cost and the net present value of its projected future cash flows discounted at the effective interest rate implicit in the debt security. All significant assumptions used in determining credit losses are subject to change as market conditions evolve. Projected cash flows for corporate securities (principally senior unsecured bonds) are driven primarily by assumptions regarding probability of default and also the timing and amount of recoveries associated with defaults. Chubb developed projected cash flows for corporate securities using market observable data, issuer-specific information, and credit ratings. We use historical default data by Moody’s Investors Service (Moody’s) rating category to calculate a 1-in-100 year probability of default, which results in a default assumption in excess of the historical mean default rate. Consistent with management's approach, Chubb assumed a 32 percent recovery rate (the par value of a defaulted security that will be recovered) across all rating categories rather than using Moody's historical mean recovery rate of 42 percent. We believe that use of a default assumption in excess of the historical mean is conservative in light of current market conditions. For the three months ended March 31, 2016 and 2015, credit losses recognized in Net income for corporate securities were $17 million and $4 million , respectively. For mortgage-backed securities, credit impairment is assessed using a cash flow model that estimates the cash flows on the underlying mortgages, using the security-specific collateral and transaction structure. The model estimates cash flows from the underlying mortgage loans and distributes those cash flows to various tranches of securities, considering the transaction structure and any subordination and credit enhancements that exist in that structure. The cash flow model incorporates actual cash flows on the mortgage-backed securities through the current period and then projects the remaining cash flows using a number of assumptions, including default rates, prepayment rates, and loss severity rates (the par value of a defaulted security that will not be recovered) on foreclosed properties. For both the three months ended March 31, 2016 and 2015 , there were no credit losses recognized in Net income for mortgage-backed securities. The following table presents the Net realized gains (losses) and the losses included in Net realized gains (losses) and OCI as a result of conditions which caused us to conclude the decline in fair value of certain investments was “other-than-temporary”: Three Months Ended March 31 (in millions of U.S. dollars) 2016 2015 Fixed maturities: OTTI on fixed maturities, gross $ (67 ) $ (13 ) OTTI on fixed maturities recognized in OCI (pre-tax) 8 — OTTI on fixed maturities, net (59 ) (13 ) Gross realized gains excluding OTTI 65 44 Gross realized losses excluding OTTI (196 ) (35 ) Total fixed maturities (190 ) (4 ) Equity securities: OTTI on equity securities (1 ) — Gross realized gains excluding OTTI 40 3 Gross realized losses excluding OTTI (1 ) (2 ) Total equity securities 38 1 OTTI on other investments (3 ) — Foreign exchange gains (losses) 39 (31 ) Investment and embedded derivative instruments (39 ) 1 Fair value adjustments on insurance derivative (228 ) (45 ) S&P put options and futures (15 ) (12 ) Other derivative instruments (2 ) — Other 6 1 Net realized gains (losses) $ (394 ) $ (89 ) The following table presents a roll-forward of pre-tax credit losses related to fixed maturities for which a portion of OTTI was recognized in OCI: Three Months Ended March 31 (in millions of U.S. dollars) 2016 2015 Balance of credit losses related to securities still held – beginning of period $ 53 $ 28 Additions where no OTTI was previously recorded 11 3 Additions where an OTTI was previously recorded 6 1 Reductions for securities sold during the period (13 ) (10 ) Balance of credit losses related to securities still held – end of period $ 57 $ 22 d) Gross unrealized loss At March 31, 2016 , there were 5,636 fixed maturities out of a total of 30,019 fixed maturities in an unrealized loss position. The largest single unrealized loss in the fixed maturities was $4 million . There were 94 equity securities out of a total of 304 equity securities in an unrealized loss position. The largest single unrealized loss in the equity securities was $2 million . Fixed maturities in an unrealized loss position at March 31, 2016 , comprised both investment grade and below investment grade securities for which fair value declined primarily due to widening credit spreads since the date of purchase. The following tables present, for all securities in an unrealized loss position (including securities on loan), the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position: 0 – 12 Months Over 12 Months Total March 31, 2016 Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss (in millions of U.S. dollars) Foreign $ 3,204 $ (69 ) $ 486 $ (53 ) $ 3,690 $ (122 ) Corporate securities 4,014 (152 ) 651 (76 ) 4,665 (228 ) Mortgage-backed securities 1,190 (4 ) 854 (7 ) 2,044 (11 ) States, municipalities, and political subdivisions 3,848 (12 ) 73 (2 ) 3,921 (14 ) Total fixed maturities 12,256 (237 ) 2,064 (138 ) 14,320 (375 ) Equity securities 310 (32 ) — — 310 (32 ) Other investments 229 (18 ) — — 229 (18 ) Total $ 12,795 $ (287 ) $ 2,064 $ (138 ) $ 14,859 $ (425 ) 0 – 12 Months Over 12 Months Total December 31, 2015 Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss (in millions of U.S. dollars) U.S. Treasury and agency $ 996 $ (5 ) $ 153 $ (1 ) $ 1,149 $ (6 ) Foreign 3,953 (148 ) 436 (73 ) 4,389 (221 ) Corporate securities 7,518 (371 ) 738 (138 ) 8,256 (509 ) Mortgage-backed securities 3,399 (42 ) 516 (12 ) 3,915 (54 ) States, municipalities, and political subdivisions 556 (6 ) 42 (2 ) 598 (8 ) Total fixed maturities 16,422 (572 ) 1,885 (226 ) 18,307 (798 ) Equity securities 131 (18 ) — — 131 (18 ) Other investments 210 (11 ) — — 210 (11 ) Total $ 16,763 $ (601 ) $ 1,885 $ (226 ) $ 18,648 $ (827 ) e) Restricted assets Chubb is required to maintain assets on deposit with various regulatory authorities to support its insurance and reinsurance operations. These requirements are generally promulgated in the statutory regulations of the individual jurisdictions. The assets on deposit are available to settle insurance and reinsurance liabilities. Chubb is also required to restrict assets pledged under repurchase agreements, which represent Chubb's agreement to sell securities and repurchase them at a future date for a predetermined price. We also use trust funds in certain large reinsurance transactions where the trust funds are set up for the benefit of the ceding companies and generally take the place of letter of credit (LOC) requirements. We also have investments in segregated portfolios primarily to provide collateral or guarantees for LOC and derivative transactions. Included in restricted assets at March 31, 2016 and December 31, 2015 , are investments, primarily fixed maturities, totaling $18.2 billion and $16.9 billion, respectively, and cash of $119 million and $110 million, respectively. The following table presents the components of restricted assets: March 31 December 31 (in millions of U.S. dollars) 2016 2015 Trust funds $ 11,681 $ 11,862 Deposits with non-U.S. regulatory authorities 2,260 2,075 Deposits with U.S. regulatory authorities 2,523 1,242 Assets pledged under repurchase agreements 1,473 1,459 Other pledged assets 400 392 $ 18,337 $ 17,030

Fair value measurements

Fair value measurements	3 Months Ended
Fair value measurements	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Fair value measurements	Fair value measurements In 2015, we retrospectively adopted new accounting guidance that no longer requires investments measured at fair value using NAV to be categorized within the fair value hierarchy. Therefore, we no longer include our investments in partially-owned investment companies, investment funds, and limited partnerships within the fair value hierarchy and the Level 3 rollforward tables disclosed below. Prior period amounts within the fair value hierarchy disclosures contained in this section have been revised to conform to the current period presentation. a ) Fair value hierarchy Fair value of financial assets and financial liabilities is estimated based on the framework established in the fair value accounting guidance. The guidance defines fair value as the price to sell an asset or transfer a liability (an exit price) in an orderly transaction between market participants and establishes a three-level valuation hierarchy based on the reliability of the inputs. The fair value hierarchy gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data. The three levels of the hierarchy are as follows: • Level 1 – Unadjusted quoted prices for identical assets or liabilities in active markets; • Level 2 – Includes, among other items, inputs other than quoted prices that are observable for the asset or liability such as interest rates and yield curves, quoted prices for similar assets and liabilities in active markets, and quoted prices for identical or similar assets and liabilities in markets that are not active; and • Level 3 – Inputs that are unobservable and reflect management’s judgments about assumptions that market participants would use in pricing an asset or liability. We categorize financial instruments within the valuation hierarchy at the balance sheet date based upon the lowest level of inputs that are significant to the fair value measurement. Accordingly, transfers between levels within the valuation hierarchy occur when there are significant changes to the inputs, such as increases or decreases in market activity, changes to the availability of current prices, changes to the transparency to underlying inputs, and whether there are significant variances in quoted prices. Transfers in and/or out of any level are assumed to occur at the end of the period. We use pricing services to obtain fair value measurements for the majority of our investment securities. Based on management’s understanding of the methodologies used, these pricing services only produce an estimate of fair value if there is observable market information that would allow them to make a fair value estimate. Based on our understanding of the market inputs used by the pricing services, all applicable investments have been valued in accordance with GAAP. We do not adjust prices obtained from pricing services. The following is a description of the valuation techniques and inputs used to determine fair values for financial instruments carried at fair value, as well as the general classification of such financial instruments pursuant to the valuation hierarchy. Fixed maturities We use pricing services to estimate fair value measurements for the majority of our fixed maturities. The pricing services use market quotations for fixed maturities that have quoted prices in active markets; such securities are classified within Level 1. For fixed maturities other than U.S. Treasury securities that generally do not trade on a daily basis, the pricing services prepare estimates of fair value measurements using their pricing applications, which include available relevant market information, benchmark curves, benchmarking of like securities, sector groupings, and matrix pricing. Additional valuation factors that can be taken into account are nominal spreads, dollar basis, and liquidity adjustments. The pricing services evaluate each asset class based on relevant market and credit information, perceived market movements, and sector news. The market inputs used in the pricing evaluation, listed in the approximate order of priority include: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data, and industry and economic events. The extent of the use of each input is dependent on the asset class and the market conditions. Given the asset class, the priority of the use of inputs may change, or some market inputs may not be relevant. Additionally, fixed maturities valuation is more subjective when markets are less liquid due to the lack of market based inputs (i.e., stale pricing), which may increase the potential that an investment's estimated fair value is not reflective of the price at which an actual transaction would occur. The overwhelming majority of fixed maturities are classified within Level 2 because the most significant inputs used in the pricing techniques are observable. For a small number of fixed maturities, we obtain a single broker quote (typically from a market maker). Due to the disclaimers on the quotes that indicate that the price is indicative only, we include these fair value estimates in Level 3. Equity securities Equity securities with active markets are classified within Level 1 as fair values are based on quoted market prices. For equity securities in markets which are less active, fair values are based on market valuations and are classified within Level 2. Equity securities for which pricing is unobservable are classified within Level 3. Short-term investments Short-term investments, which comprise securities due to mature within one year of the date of purchase that are traded in active markets, are classified within Level 1 as fair values are based on quoted market prices. Securities such as commercial paper and discount notes are classified within Level 2 because these securities are typically not actively traded due to their approaching maturity and, as such, their cost approximates fair value. Short-term investments for which pricing is unobservable are classified within Level 3. Other investments Fair values for the majority of Other investments including investments in partially-owned investment companies, investment funds, and limited partnerships are based on their respective net asset values or equivalent (NAV) and are excluded from the fair value hierarchy table below. Certain of our long-duration contracts are supported by assets that do not qualify for separate account reporting under GAAP. These assets comprise mutual funds classified within Level 1 in the valuation hierarchy on the same basis as other equity securities traded in active markets. Other investments also include equity securities classified within Level 1, and fixed maturities, classified within Level 2, held in rabbi trusts maintained by Chubb for deferred compensation plans, and are classified within the valuation hierarchy on the same basis as other equity securities and fixed maturities. Other investments for which pricing is unobservable are classified within Level 3. Securities lending collateral The underlying assets included in Securities lending collateral in the consolidated balance sheets are fixed maturities which are classified in the valuation hierarchy on the same basis as other fixed maturities. Excluded from the valuation hierarchy is the corresponding liability related to Chubb’s obligation to return the collateral plus interest as it is reported at contract value and not fair value in the consolidated balance sheets. Investment derivative instruments Actively traded investment derivative instruments, including futures, options, and forward contracts are classified within Level 1 as fair values are based on quoted market prices. The fair value of cross-currency swaps are based on market valuations and are classified within Level 2. Investment derivative instruments are recorded in either Other assets or Accounts payable, accrued expenses, and other liabilities in the consolidated balance sheets. Other derivative instruments We generally maintain positions in other derivative instruments including exchange-traded equity futures contracts and option contracts designed to limit exposure to a severe equity market decline, which would cause an increase in expected claims and, therefore, an increase in reserves for our guaranteed minimum death benefits (GMDB) and guaranteed living benefits (GLB) reinsurance business. Our position in exchange-traded equity futures contracts is classified within Level 1. At March 31, 2016, we held no positions in option contracts on equity market indices. The fair value of the majority of the remaining positions in other derivative instruments is based on significant observable inputs including equity security and interest rate indices. Accordingly, these are classified within Level 2. Other derivative instruments based on unobservable inputs are classified within Level 3. Other derivative instruments are recorded in either Other assets or Accounts payable, accrued expenses, and other liabilities in the consolidated balance sheets. Separate account assets Separate account assets represent segregated funds where investment risks are borne by the customers, except to the extent of certain guarantees made by Chubb. Separate account assets comprise mutual funds classified within Level 1 in the valuation hierarchy on the same basis as other equity securities traded in active markets. Separate account assets also include fixed maturities classified within Level 2 because the most significant inputs used in the pricing techniques are observable. Excluded from the valuation hierarchy are the corresponding liabilities as they are reported at contract value and not fair value in the consolidated balance sheets. Separate account assets are recorded in Other assets in the consolidated balance sheets. Guaranteed living benefits The GLB arises from life reinsurance programs covering living benefit guarantees whereby we assume the risk of guaranteed minimum income benefits (GMIB) and guaranteed minimum accumulation benefits (GMAB) associated with variable annuity contracts. GLB’s are recorded in Accounts payable, accrued expenses, and other liabilities and Future policy benefits in the consolidated balance sheets. For GLB reinsurance, Chubb estimates fair value using an internal valuation model which includes current market information and estimates of policyholder behavior. All of the treaties contain claim limits, which are factored into the valuation model. The fair value depends on a number of factors, including interest rates, equity markets, credit risk, current account value, market volatility, expected annuitization rates and other policyholder behavior, and changes in policyholder mortality. The most significant policyholder behavior assumptions include lapse rates and the GMIB annuitization rates. Assumptions regarding lapse rates and GMIB annuitization rates differ by treaty, but the underlying methodologies to determine rates applied to each treaty are comparable. A lapse rate is the percentage of in-force policies surrendered in a given calendar year. All else equal, as lapse rates increase, ultimate claim payments will decrease. GMIB annuitization rate is the percentage of policies for which the policyholder will elect to annuitize using the guaranteed benefit provided under the GMIB. All else equal, as GMIB annuitization rates increase, ultimate claim payments will increase, subject to treaty claim limits. The effect of changes in key market factors on assumed lapse and annuitization rates reflect emerging trends using data available from cedants. For treaties with limited experience, rates are established in line with data received from other ceding companies adjusted, as appropriate, with industry estimates. The model and related assumptions are regularly re-evaluated by management and enhanced, as appropriate, based upon additional experience obtained related to policyholder behavior and availability of updated information such as market conditions, market participant assumptions, and demographics of in-force annuities. Because of the significant use of unobservable inputs including policyholder behavior, GLB reinsurance is classified within Level 3. For the three months ended March 31, 2016 and 2015, no material technical refinements were made to the model. For detailed information on our lapse and annuitization rate assumptions, refer to Note 4 to the Consolidated Financial Statements of our 2015 Form 10-K. Financial instruments measured at fair value on a recurring basis, by valuation hierarchy March 31, 2016 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available for sale U.S. Treasury and agency $ 2,444 $ 625 $ — $ 3,069 Foreign — 20,531 62 20,593 Corporate securities — 21,950 261 22,211 Mortgage-backed securities — 11,997 48 12,045 States, municipalities, and political subdivisions — 19,620 — 19,620 2,444 74,723 371 77,538 Equity securities 864 — 29 893 Short-term investments 1,405 1,977 — 3,382 Other investments (1) 362 237 211 810 Securities lending collateral — 1,003 — 1,003 Investment derivative instruments 11 — — 11 Other derivative instruments — — — — Separate account assets 1,499 90 — 1,589 Total assets measured at fair value (1) $ 6,585 $ 78,030 $ 611 $ 85,226 Liabilities: Investment derivative instruments $ 23 $ — $ — $ 23 Other derivative instruments 36 — 10 46 GLB (2) — — 839 839 Total liabilities measured at fair value $ 59 $ — $ 849 $ 908 (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $ 3,658 million and other investments of $ 25 million at March 31, 2016 measured using NAV. (2) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information. December 31, 2015 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available for sale U.S. Treasury and agency $ 1,712 $ 816 $ — $ 2,528 Foreign — 13,388 57 13,445 Corporate securities — 14,755 174 14,929 Mortgage-backed securities — 9,905 53 9,958 States, municipalities, and political subdivisions — 2,727 — 2,727 1,712 41,591 284 43,587 Equity securities 481 — 16 497 Short-term investments 7,171 3,275 — 10,446 Other investments (1) 347 230 212 789 Securities lending collateral — 1,046 — 1,046 Investment derivative instruments 12 — — 12 Separate account assets 1,464 88 — 1,552 Total assets measured at fair value (1) $ 11,187 $ 46,230 $ 512 $ 57,929 Liabilities: Investment derivative instruments $ 13 $ — $ — $ 13 Other derivative instruments 4 — 6 10 GLB (2) — — 609 609 Total liabilities measured at fair value $ 17 $ — $ 615 $ 632 (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $2,477 million and other investments of $25 million at December 31, 2015 measured using NAV. (2) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information. There were no transfers between Level 1 and Level 2 for the three months ended March 31, 2016 and 2015. Fair value of alternative investments Alternative investments include investment funds, limited partnerships, and partially-owned investment companies measured at fair value using NAV as a practical expedient. The following table presents, by investment category, the expected liquidation period, fair value, and maximum future funding commitments of alternative investments: March 31 December 31 Expected Liquidation Period of Underlying Assets 2016 2015 (in millions of U.S. dollars) Fair Value Maximum Future Funding Commitments Fair Value Maximum Future Funding Commitments Financial 5 to 9 Years $ 580 $ 210 $ 300 $ 105 Real Assets 3 to 7 Years 577 321 474 140 Distressed 5 to 9 Years 451 217 261 218 Private Credit 3 to 7 Years 272 349 265 209 Traditional 3 to 9 Years 1,498 1,001 895 152 Vintage 1 to 2 Years 36 14 13 — Investment funds Not Applicable 244 — 269 — $ 3,658 $ 2,112 $ 2,477 $ 824 Included in all categories in the above table except for Investment funds are investments for which Chubb will never have the contractual option to redeem but receives distributions based on the liquidation of the underlying assets. Further, for all categories except for Investment funds, Chubb does not have the ability to sell or transfer the investments without the consent from the general partner of individual funds. Investment Category Consists of investments in private equity funds: Financial targeting financial services companies such as financial institutions and insurance services worldwide Real Assets targeting investments related to hard physical assets such as real estate, infrastructure and natural resources Distressed targeting distressed corporate debt/credit and equity opportunities in the U.S. Private Credit targeting privately originated corporate debt investments including senior secured loans and subordinated bonds Traditional employing traditional private equity investment strategies such as buyout and growth equity globally Vintage made before 2002 and where the funds’ commitment periods had already expired Investment funds Chubb’s investment funds employ various investment strategies such as long/short equity and arbitrage/distressed. Included in this category are investments for which Chubb has the option to redeem at agreed upon value as described in each investment fund’s subscription agreement. Depending on the terms of the various subscription agreements, investment fund investments may be redeemed monthly, quarterly, semi-annually, or annually. If Chubb wishes to redeem an investment fund investment, it must first determine if the investment fund is still in a lock-up period (a time when Chubb cannot redeem its investment so that the investment fund manager has time to build the portfolio). If the investment fund is no longer in its lock-up period, Chubb must then notify the investment fund manager of its intention to redeem by the notification date prescribed by the subscription agreement. Subsequent to notification, the investment fund can redeem Chubb’s investment within several months of the notification. Notice periods for redemption of the investment funds range between 5 and 120 days. Chubb can redeem its investment funds without consent from the investment fund managers. Level 3 financial instruments The fair values of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) consist of various inputs and assumptions that management makes when determining fair value. Management analyzes changes in fair value measurements classified within Level 3 by comparing pricing and returns of our investments to benchmarks, including month-over-month movements, investment credit spreads, interest rate movements, and credit quality of securities. The following table presents the significant unobservable inputs used in the Level 3 liability valuations. Excluded from the table below are inputs used to determine the fair value of Level 3 assets which are based on single broker quotes and contain no quantitative unobservable inputs developed by management. (in millions of U.S. dollars, except for percentages) Fair Value Valuation Technique Significant Unobservable Inputs Ranges March 31, 2016 December 31, 2015 GLB (1) $ 839 $ 609 Actuarial model Lapse rate 1% – 30% Annuitization rate 0% – 55% (1) Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 4 a) Guaranteed living benefits. The following tables present a reconciliation of the beginning and ending balances of financial instruments measured at fair value using significant unobservable inputs (Level 3). Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity securities Other investments Other derivative instruments GLB (1) March 31, 2016 Foreign Corporate securities MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 57 $ 174 $ 53 $ 16 $ 212 $ 6 $ 609 Transfers into Level 3 6 16 — — — — — Transfers out of Level 3 (2 ) — — — — — — Change in Net Unrealized Gains (Losses) included in OCI 6 2 — — — — — Net Realized Gains/Losses (5 ) (6 ) — — — 2 230 Purchases (2) 5 93 — 13 6 2 — Sales (1 ) (14 ) (5 ) — — — — Settlements (4 ) (4 ) — — (7 ) — — Balance–End of Period $ 62 $ 261 $ 48 $ 29 $ 211 $ 10 $ 839 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (4 ) $ (7 ) $ — $ — $ — $ 2 $ 230 (1) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information. (2) Includes acquired invested assets as a result of the Chubb Corp acquisition. Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity Other Other derivative instruments GLB (1) March 31, 2015 Foreign Corporate MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 22 $ 187 $ 15 $ 2 $ 204 $ 4 $ 406 Transfers into Level 3 — 1 — — — — — Change in Net Unrealized Gains (Losses) included in OCI — 3 — — (2 ) — — Net Realized Gains/Losses — (3 ) — — — — 45 Purchases 1 8 18 — 9 — — Sales (1 ) (3 ) — — — — — Settlements — (26 ) — — (3 ) — — Balance–End of Period $ 22 $ 167 $ 33 $ 2 $ 208 $ 4 $ 451 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ (2 ) $ — $ — $ — $ — $ 45 (1) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. The liability for GLB reinsurance was $716 million at March 31, 2015 , and $663 million at December 31, 2014, which includes a fair value derivative adjustment of $451 million and $406 million, respectively. b) Financial instruments disclosed, but not measured, at fair value Chubb uses various financial instruments in the normal course of its business. Our insurance contracts are excluded from fair value of financial instruments accounting guidance, and therefore, are not included in the amounts discussed below. The carrying values of cash, other assets, other liabilities, and other financial instruments not included below approximated their fair values. Investments in partially-owned insurance companies Fair values for investments in partially-owned insurance companies are based on Chubb’s share of the net assets based on the financial statements provided by those companies and are excluded from the valuation hierarchy tables below. Short- and long-term debt, repurchase agreements, and trust preferred securities Where practical, fair values for short-term debt, long-term debt, repurchase agreements, and trust preferred securities are estimated using discounted cash flow calculations based principally on observable inputs including incremental borrowing rates, which reflect Chubb’s credit rating, for similar types of borrowings with maturities consistent with those remaining for the debt being valued. The following tables present fair value, by valuation hierarchy, and carrying value of the financial instruments not measured at fair value: March 31, 2016 Fair Value Carrying Value (in millions of U.S. dollars) Level 1 Level 2 Level 3 Total Assets: Fixed maturities held to maturity U.S. Treasury and agency $ 598 $ 125 $ — $ 723 $ 700 Foreign — 783 — 783 749 Corporate securities — 3,020 13 3,033 2,951 Mortgage-backed securities — 1,716 — 1,716 1,652 States, municipalities, and political subdivisions — 5,325 — 5,325 5,228 Total assets $ 598 $ 10,969 $ 13 $ 11,580 $ 11,280 Liabilities: Repurchase agreements $ — $ 1,403 $ — $ 1,403 $ 1,403 Short-term debt — 519 — 519 500 Long-term debt — 13,317 — 13,317 12,636 Trust preferred securities — 433 — 433 308 Total liabilities $ — $ 15,672 $ — $ 15,672 $ 14,847 December 31, 2015 Fair Value Carrying Value (in millions of U.S. dollars) Level 1 Level 2 Level 3 Total Assets: Fixed maturities held to maturity U.S. Treasury and agency $ 583 $ 162 $ — $ 745 $ 733 Foreign — 785 — 785 763 Corporate securities — 3,042 14 3,056 3,054 Mortgage-backed securities — 1,743 — 1,743 1,707 States, municipalities, and political subdivisions — 2,223 — 2,223 2,173 Total assets $ 583 $ 7,955 $ 14 $ 8,552 $ 8,430 Liabilities: Repurchase agreements $ — $ 1,404 $ — $ 1,404 $ 1,404 Long-term debt — 9,678 — 9,678 9,389 Trust preferred securities — 446 — 446 307 Total liabilities $ — $ 11,528 $ — $ 11,528 $ 11,100

Assumed life reinsurance progra

Assumed life reinsurance programs involving minimum benefit guarantees under annuity contracts	3 Months Ended
	Mar. 31, 2016
Reinsurance Disclosures [Abstract]
Assumed life reinsurance programs involving minimum benefit guarantees under annuity contracts	Assumed life reinsurance programs involving minimum benefit guarantees under variable annuity contracts The following table presents income and expenses relating to GMDB and GLB reinsurance. GLBs include GMIBs as well as some GMABs originating in Japan. Three Months Ended March 31 (in millions of U.S. dollars) 2016 2015 GMDB Net premiums earned $ 14 $ 16 Policy benefits and other reserve adjustments $ 8 $ 9 GLB Net premiums earned $ 29 $ 32 Policy benefits and other reserve adjustments 11 12 Net realized gains (losses) (234 ) (45 ) Loss recognized in Net income $ (216 ) $ (25 ) Less: Net cash received 18 28 Net increase in liability $ (234 ) $ (53 ) Net realized gains (losses) in the table above include gains (losses) related to foreign exchange and fair value adjustments on insurance derivatives and exclude gains (losses) on S&P put options and futures used to partially offset the risk in the GLB reinsurance portfolio. Refer to Note 8 for additional information. The reported liability for GMDB reinsurance was $115 million and $ 117 million at March 31, 2016 and December 31, 2015, respectively. At March 31, 2016 and December 31, 2015, the reported liability for GLB reinsurance was $1.1 billion and $888 million, respectively, which includes a fair value derivative adjustment of $ 839 million and $609 million, respectively. Reported liabilities for both GMDB and GLB reinsurance are determined using internal valuation models. Such valuations require considerable judgment and are subject to significant uncertainty. The valuation of these products is subject to fluctuations arising from, among other factors, changes in interest rates, changes in equity markets, changes in credit markets, changes in the allocation of the investments underlying annuitants’ account values, and assumptions regarding future policyholder behavior. These models and the related assumptions are regularly reviewed by management and enhanced, as appropriate, based upon improvements in modeling assumptions and availability of updated information, such as market conditions and demographics of in-force annuities.

Goodwill and other intangible a

Goodwill and other intangible assets Goodwill and other intangible assets	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets [Text Block]	Goodwill and other intangible assets At March 31, 2016 and December 31, 2015, goodwill was $ 15.4 billion and $ 4.8 billion , respectively, and Other intangible assets were $ 8.0 billion and $ 887 million , respectively. The increase in goodwill and Other intangible assets reflects the goodwill and intangible assets recorded in connection with the Chubb Corp acquisition. The preliminary purchase price allocation to intangible assets recorded in connection with the Chubb Corp acquisition and their related useful lives are as follows: (in millions of U.S. dollars) Amount Estimated useful life Definite life Unearned premium reserves (UPR) intangible asset $ 1,550 1 year Agency distribution relationships and renewal rights 3,150 24 years Internally developed technology 95 3 years Indefinite life Trademarks 2,800 Indefinite Licenses 50 Indefinite Syndicate capacity 10 Indefinite Total identified intangible assets $ 7,655 At the date of acquisition, we recorded a deferred tax liability of $ 2,679 million associated with intangible assets in the table above. At March 31, 2016, the deferred tax liability balance was $ 2,465 million . Additionally, in connection with the Chubb Corp acquisition, we recorded an increase to unpaid losses and loss expenses acquired as part of Chubb Corp of $ 715 million to adjust the carrying value of Chubb Corp's historical unpaid losses and loss expenses to fair value as of the acquisition date. The estimated fair value consists of the present value of the expected net unpaid loss and loss adjustment expenses payments adjusted for an estimated risk margin. The expected cash flows are discounted at a risk free rate. The estimated risk margin varies based on the inherent risks associated with each type of reserve. This fair value adjustment was recorded within Unpaid losses and loss expenses on the Consolidated balance sheets and will amortize through Amortization of purchased intangibles on the consolidated statements of operations over a range of 5 to 17 years, based on the estimated payout patterns of unpaid loss and loss expenses as of the acquisition date. The following table presents, as of March 31, 2016 , the expected estimated pre-tax amortization expense related to purchased intangibles as well as the amortization of the fair value adjustment to loss reserve described above: Associated with the Chubb Corp Acquisition For the Year Ending December 31 (in millions of U.S. dollars) Agency distribution relationships and renewal rights Internally developed technology Fair Value adjustment to Unpaid losses and loss expense Total Other intangible assets Total amortization of purchased intangibles Second quarter of 2016 $ 33 $ 8 $ (61 ) $ (20 ) $ 21 $ 1 Third quarter of 2016 33 8 (61 ) (20 ) 21 1 Fourth quarter of 2016 33 8 (61 ) (20 ) 21 1 2017 293 32 (160 ) 165 79 244 2018 320 32 (101 ) 251 70 321 2019 279 — (62 ) 217 64 281 2020 239 — (35 ) 204 58 262 2021 216 — (20 ) 196 52 248 Total $ 1,446 $ 88 $ (561 ) $ 973 $ 386 $ 1,359 As noted above, the deferred tax liability balance at March 31, 2016 was $ 2,465 million . The following table presents the expected reduction to the deferred tax liability, which assumed an expected 35 percent tax rate, associated with the amortization of the Chubb Corp purchased intangible assets. In addition, the table presents the expected amortization pattern of the UPR intangible asset. Chubb Corp acquisition For the Year Ending December 31 Reduction to deferred tax liability associated with other intangibles Amortization of UPR intangible asset to be recorded through Policy acquisition costs on the income statement Second quarter of 2016 $ (196 ) $ 518 Third quarter of 2016 (126 ) 319 Fourth quarter of 2016 (65 ) 143 2017 (114 ) — 2018 (123 ) — 2019 (98 ) — 2020 (84 ) — 2021 (75 ) — Total $ (881 ) $ 980 The following table presents a roll-forward of Goodwill by segment: (in millions of U.S. dollars) North America Commercial P&C Insurance North America Personal P&C Insurance North America Agricultural Insurance Overseas General Insurance Global Reinsurance Life Insurance Chubb Consolidated Balance at December 31, 2015 $ 1,203 $ 196 $ 134 $ 2,078 $ 365 $ 820 $ 4,796 Acquisition of Chubb Corp 5,667 2,025 — 2,753 — — 10,445 Foreign exchange revaluation and other 40 13 — 109 — 1 163 Balance at March 31, 2016 $ 6,910 $ 2,234 $ 134 $ 4,940 $ 365 $ 821 $ 15,404

Debt

Debt	3 Months Ended
Debt	Mar. 31, 2016
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Debt In connection with the Chubb Corp acquisition, Chubb INA Holdings Inc. (formerly ACE INA Holdings Inc.) assumed $ 3.3 billion par value outstanding debt of Chubb Corp, fair valued at $ 3.8 billion . Chubb INA Holdings assumed Chubb Corp's rights, duties and obligations and Chubb Limited fully and unconditionally guarantees Chubb INA Holding Inc.'s payment obligations under these debts. Additionally, during the first quarter of 2016 we adopted new guidance that required debt issuance costs be recorded as a reduction of the carrying amount of the related debt liability (these costs were previously included in Other assets on the Consolidated balance sheets). The debt balances at December 31, 2015 have been updated to reflect the adoption of this guidance. March 31 December 31 (in millions of U.S. dollars) 2016 2015 Early Redemption Option Repurchase agreements (weighted average interest rate of 0.8% in 2016 and 0.6% in 2015) $ 1,403 $ 1,404 None Short-term debt Chubb INA senior notes: $500 million 5.7% due February 2017 $ 500 $ — Make-whole premium plus 0.20% Total short-term debt $ 500 $ — Long-term debt Chubb INA senior notes: $500 million 5.7% due February 2017 $ — $ 500 Make-whole premium plus 0.20% $300 million 5.8% due March 2018 299 299 Make-whole premium plus 0.35% $600 million 5.75% due May 2018 654 — Make-whole premium plus 0.30% $100 million 6.6% due August 2018 111 — None $500 million 5.9% due June 2019 497 497 Make-whole premium plus 0.40% $1,300 million 2.3% due November 2020 1,293 1,294 Make-whole premium plus 0.15% $1,000 million 2.875% due November 2022 993 994 Make-whole premium plus 0.20% $475 million 2.7% due March 2023 471 471 Make-whole premium plus 0.10% $700 million 3.35% due May 2024 694 694 Make-whole premium plus 0.15% $800 million 3.15% due March 2025 794 794 Make-whole premium plus 0.15% $1,500 million 3.35% due May 2026 1,487 1,487 Make-whole premium plus 0.20% $100 million 8.875% due August 2029 100 100 None $200 million 6.8% due November 2031 260 — Make-whole premium plus 0.25% $300 million 6.7% due May 2036 297 297 Make-whole premium plus 0.20% $800 million 6.0% due May 2037 992 — Make-whole premium plus 0.20% $600 million 6.5% due May 2038 784 — Make-whole premium plus 0.30% $475 million 4.15% due March 2043 469 469 Make-whole premium plus 0.15% $1,500 million 4.35% due November 2045 1,482 1,482 Make-whole premium plus 0.25% Chubb INA $1,000 million 6.375% capital securities due March 2067 948 — Make-whole premium plus 0.25%-0.50% Other long-term debt (2.75% to 7.1% due December 2019 to September 2020) 11 11 None Total long-term debt $ 12,636 $ 9,389 Trust preferred securities Chubb INA capital securities due April 2030 $ 308 $ 307 Redemption price (1) (1) Redemption price is equal to accrued and unpaid interest to the redemption date plus the greater of (i) 100 percent of the principal amount thereof, or (ii) sum of present value of scheduled payments of principal and interest on the debentures from the redemption date to April 1, 2030. All of Chubb INA's senior notes are redeemable at any time at Chubb INA's option subject to the provisions described in the table above. A "make-whole" premium is the present value of the remaining principal and interest discounted at the applicable U.S. Treasury rate. The senior notes are also redeemable at par plus accrued and unpaid interest in the event of certain changes in tax law. The debentures, subject to certain exceptions, are not redeemable before maturity. We had outstanding $ 1.0 billion of unsecured junior subordinated capital securities at March 31, 2016, which were assumed by Chubb INA Holdings Inc. in connection with the Chubb Corp acquisition. The capital securities will become due on April 15, 2037, the scheduled maturity date, but only to the extent that we have received sufficient net proceeds from the sale of certain qualifying capital securities. We must use commercially reasonable efforts, subject to certain market disruption events, to sell enough qualifying capital securities to permit repayment of the capital securities on the schedule maturity date or as soon thereafter as possible. Any remaining outstanding principal amount will be due on March 29, 2067, the final maturity date. The capital securities bear interest at a rate of 6.375 percent through April 14, 2017. Thereafter, the capital securities will bear interest at a rate equal to the three-month LIBOR rate plus 2.25 percent. Subject to certain conditions, we have the right to defer the payment of interest on the capital securities for a period not exceeding ten consecutive years. During any such period, interest will continue to accrue and we generally may not declare or pay any dividends on or purchase any shares of our capital stock. In connection with the issuance of capital securities, a replacement capital covenant was entered into in which we agreed that we will not repay, redeem, or purchase capital securities before March 29, 2047, unless, subject to certain limitations, we have received proceeds from the sale of specified replacement capital securities. The replacement capital covenant is not intended for the benefit of holders of the capital securities and may not be enforced by them. The replacement capital covenant is for the benefit of holders of one or more designated series of Chubb's indebtedness, which initially was and continues to be its 6.8 percent debentures due November 2031. Subject to the replacement capital covenant, the capital securities may be redeemed, in whole or in part, at any time on or after April 15, 2017 at a redemption price equal to the principal amount plus any accrued interest or prior to April 15, 2017 at a redemption price equal to the greater of (i) the principal amount or (ii) a make-whole premium, in each case plus any accrued interest.

Commitments, contingencies, and

Commitments, contingencies, and guarantees	3 Months Ended
Commitments, contingencies, and guarantees	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments, contingencies, and guarantees	Commitments, contingencies, and guarantees a) Derivative instruments Foreign currency management As a global company, Chubb entities transact business in multiple currencies. Our policy is to generally match assets, liabilities, and required capital for each individual jurisdiction in local currency, which would include the use of derivatives discussed below. We do not hedge our net asset non-U.S. dollar capital positions; however, we do consider hedging for planned cross border transactions. Derivative instruments employed Chubb maintains positions in derivative instruments such as futures, options, swaps, and foreign currency forward contracts for which the primary purposes are to manage duration and foreign currency exposure, yield enhancement, or to obtain an exposure to a particular financial market. Chubb also maintains positions in convertible securities that contain embedded derivatives. Investment derivative instruments are recorded in either Other assets (OA) or Accounts payable, accrued expenses, and other liabilities (AP), convertible bonds are recorded in Fixed maturities available for sale (FM AFS), and convertible equity securities are recorded in Equity securities (ES) in the consolidated balance sheets. These are the most numerous and frequent derivative transactions. In addition, Chubb from time to time purchases to be announced mortgage-backed securities (TBAs) as part of its investing activities. Under reinsurance programs covering GLBs, Chubb assumes the risk of GLBs, including GMIB and GMAB, associated with variable annuity contracts. The GMIB risk is triggered if, at the time the contract holder elects to convert the accumulated account value to a periodic payment stream (annuitize), the accumulated account value is not sufficient to provide a guaranteed minimum level of monthly income. The GMAB risk is triggered if, at contract maturity, the contract holder’s account value is less than a guaranteed minimum value. The GLB reinsurance product meets the definition of a derivative instrument. Benefit reserves in respect of GLBs are classified as Future policy benefits (FPB) while the fair value derivative adjustment is classified within AP. Chubb also generally maintains positions in exchange-traded equity futures contracts and options on equity market indices to limit equity exposure in the GMDB and GLB blocks of business. At March 31, 2016, we held no positions in option contracts on equity market indices. All derivative instruments are carried at fair value with changes in fair value recorded in Net realized gains (losses) in the consolidated statements of operations. None of the derivative instruments are designated as hedges for accounting purposes. The following table presents the balance sheet locations, fair values of derivative instruments in an asset or (liability) position, and notional values/payment provisions of our derivative instruments: March 31, 2016 December 31, 2015 Consolidated Balance Sheet Location Fair Value Notional Value/ Payment Provision Fair Value Notional Value/ Payment Provision (in millions of U.S. dollars) Derivative Asset Derivative (Liability) Derivative Asset Derivative (Liability) Investment and embedded derivative instruments Foreign currency forward contracts OA / (AP) $ 6 $ (19 ) $ 903 $ 7 $ (11 ) $ 1,029 Cross-currency swaps OA / (AP) — — 95 — — 95 Options/Futures contracts on notes and bonds OA / (AP) 5 (4 ) 1,235 5 (2 ) 751 Convertible securities (1) FM AFS / ES 3 — 7 31 — 40 $ 14 $ (23 ) $ 2,240 $ 43 $ (13 ) $ 1,915 Other derivative instruments Futures contracts on equities (2) OA / (AP) $ — $ (36 ) $ 1,171 $ — $ (4 ) $ 1,197 Other OA / (AP) — (10 ) 71 — (6 ) 15 $ — $ (46 ) $ 1,242 $ — $ (10 ) $ 1,212 GLB (3) (AP) / (FPB) $ — $ (1,122 ) $ 1,377 $ — $ (888 ) $ 1,155 (1) Includes fair value of embedded derivatives. (2) Related to GMDB and GLB blocks of business. (3) Includes both future policy benefits reserves and fair value derivative adjustment. Refer to Note 5 for additional information. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts. At March 31, 2016 and December 31, 2015, derivative liabilities of $44 million and derivative assets of $1 million , respectively, included in the table above were subject to a master netting agreement. The remaining derivatives included in the table above were not subject to a master netting agreement. b) Secured borrowings Chubb participates in a securities lending program operated by a third-party banking institution whereby certain assets are loaned to qualified borrowers and from which we earn an incremental return. At March 31, 2016 and December 31, 2015, our securities lending collateral was $1,003 million and $1,046 million, respectively, and our securities lending payable, reflecting our obligation to return the collateral plus interest, was $1,004 million and $1,047 million, respectively. The securities lending collateral can only be drawn down by Chubb in the event that the institution borrowing the securities is in default under the lending agreement. An indemnification agreement with the lending agent protects us in the event a borrower becomes insolvent or fails to return any of the securities on loan. The collateral is recorded in Securities lending collateral and the liability is recorded in Securities lending payable in the consolidated balance sheets. The following table presents the carrying value of collateral held under securities lending agreements by investment category and remaining contractual maturity of the underlying agreements: Remaining contractual maturity March 31, 2016 Overnight and Continuous (in millions of U.S. dollars) Collateral held under securities lending agreements: Cash $ 434 U.S. Treasury and agency 89 Foreign 212 Corporate securities 2 Equity securities 266 $ 1,003 Gross amount of recognized liability for securities lending payable $ 1,004 Difference (1) $ (1 ) (1) The carrying value of the securities lending collateral held is $1 million lower than the securities lending payable due to accrued interest recorded in the securities lending payable. At March 31, 2016 and December 31, 2015, our repurchase agreement obligations of $1,403 million and $1,404 million , respectively, were fully collateralized. In contrast to securities lending programs, the use of cash received is not restricted for the repurchase obligations. The fair value of the underlying securities sold remains in Fixed maturities available for sale and Equity securities and the repurchase agreement obligation is recorded in Repurchase agreements in the consolidated balance sheets. The following table presents the carrying value of collateral pledged under repurchase agreements by investment category and remaining contractual maturity of the underlying agreements: Remaining contractual maturity March 31, 2016 Greater than 90 Days (in millions of U.S. dollars) Collateral pledged under repurchase agreements: U.S. Treasury and agency $ 238 Mortgage-backed securities 1,235 $ 1,473 Gross amount of recognized liabilities for repurchase agreements $ 1,403 Difference (1) $ 70 (1) Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability. Potential risks exist in our secured borrowing transactions due to market conditions and counterparty exposure. With collateral that we pledge, there is a risk that the collateral may not be returned at the expiration of the agreement. If the counterparty fails to return the collateral, Chubb will have free use of the borrowed funds until our collateral is returned. In addition, we may encounter the risk that Chubb may not be able to renew outstanding borrowings with a new term or with an existing counterparty due to market conditions including a decrease in demand as well as more restrictive terms from banks due to increased regulatory and capital constraints. Should this condition occur, Chubb may seek alternative borrowing sources or reduce borrowings. Additionally, increased margins and collateral requirements due to market conditions would increase our restricted assets as we are required to provide additional collateral to support the transaction. The following table presents net realized gains (losses) related to derivative instrument activity in the consolidated statements of operations: Three Months Ended March 31 (in millions of U.S. dollars) 2016 2015 Investment and embedded derivative instruments Foreign currency forward contracts $ (10 ) $ 25 All other futures contracts and options (34 ) (29 ) Convertible securities (1) 5 5 Total investment and embedded derivative instruments $ (39 ) $ 1 GLB and other derivative instruments GLB (2) $ (228 ) $ (45 ) Futures contracts on equities (3) (15 ) (11 ) Options on equity market indices (3) — (1 ) Other (2 ) — Total GLB and other derivative instruments $ (245 ) $ (57 ) $ (284 ) $ (56 ) (1) Includes embedded derivatives. (2) Excludes foreign exchange gains (losses) related to GLB. (3) Related to GMDB and GLB blocks of business. c) Derivative instrument objectives (i) Foreign currency exposure management A foreign currency forward contract (forward) is an agreement between participants to exchange specific foreign currencies at a future date. Chubb uses forwards to minimize the effect of fluctuating foreign currencies as discussed above. (ii) Duration management and market exposure Futures Futures contracts give the holder the right and obligation to participate in market movements, determined by the index or underlying security on which the futures contract is based. Settlement is made daily in cash by an amount equal to the change in value of the futures contract times a multiplier that scales the size of the contract. Exchange-traded futures contracts on money market instruments, notes and bonds are used in fixed maturity portfolios to more efficiently manage duration, as substitutes for ownership of the money market instruments, bonds and notes without significantly increasing the risk in the portfolio. Investments in futures contracts may be made only to the extent that there are assets under management not otherwise committed. Exchange-traded equity futures contracts are used to limit exposure to a severe equity market decline, which would cause an increase in expected claims and therefore, an increase in reserves for GMDB and GLB reinsurance business. Options An option contract conveys to the holder the right, but not the obligation, to purchase or sell a specified amount or value of an underlying security at a fixed price. Option contracts are used in the investment portfolio as protection against unexpected shifts in interest rates, which would affect the duration of the fixed maturity portfolio. By using options in the portfolio, the overall interest rate sensitivity of the portfolio can be reduced. Option contracts may also be used as an alternative to futures contracts in the synthetic strategy as described above. Another use for option contracts is to limit exposure to a severe equity market decline, which would cause an increase in expected claims and therefore, an increase in reserves for GMDB and GLB reinsurance business. The price of an option is influenced by the underlying security, expected volatility, time to expiration, and supply and demand. The credit risk associated with the above derivative financial instruments relates to the potential for non-performance by counterparties. Although non-performance is not anticipated, in order to minimize the risk of loss, management monitors the creditworthiness of its counterparties and obtains collateral. The performance of exchange-traded instruments is guaranteed by the exchange on which they trade. For non-exchange-traded instruments, the counterparties are principally banks which must meet certain criteria according to our investment guidelines. Cross-currency swaps Cross-currency swaps are agreements under which two counterparties exchange interest payments and principal denominated in different currencies at a future date. We use cross-currency swaps to reduce the foreign currency and interest rate risk by converting cash flows back into local currency. We invest in foreign currency denominated investments to improve credit diversification and also to obtain better duration matching to our liabilities that is limited in the local currency market. Other Included within Other are derivatives intended to reduce potential losses which may arise from certain exposures in our insurance business. The economic benefit provided by these derivatives is similar to purchased reinsurance. For example, Chubb may enter into crop derivative contracts to protect underwriting results in the event of a significant decline in commodity prices. Also included within Other are certain life insurance products that meet the definition of a derivative instrument for accounting purposes. (iii) Convertible security investments A convertible security is a debt instrument or preferred stock that can be converted into a predetermined amount of the issuer’s equity. The convertible option is an embedded derivative within the host instruments which are classified in the investment portfolio as either available for sale or as an equity security. Chubb purchases convertible securities for their total return and not specifically for the conversion feature. (iv) TBA By acquiring TBAs, we make a commitment to purchase a future issuance of mortgage-backed securities. For the period between purchase of the TBAs and issuance of the underlying security, we account for our position as a derivative in the consolidated financial statements. Chubb purchases TBAs both for their total return and for the flexibility they provide related to our mortgage-backed security strategy. (v) GLB Under the GLB program, as the assuming entity, Chubb is obligated to provide coverage until the expiration or maturity of the underlying deferred annuity contracts or the expiry of the reinsurance treaty. Premiums received under the reinsurance treaties are classified as premium. Expected losses allocated to premiums received are classified as Future policy benefits and valued similar to GMDB reinsurance. Other changes in fair value, principally arising from changes in expected losses allocated to expected future premiums, are classified as Net realized gains (losses). Fair value represents management’s estimate of an exit price and thus, includes a risk margin. We may recognize a realized loss for other changes in fair value due to adverse changes in the capital markets (e.g., declining interest rates and/or declining equity markets) and changes in actual or estimated future policyholder behavior (e.g., increased annuitization or decreased lapse rates) although we expect the business to be profitable. We believe this presentation provides the most meaningful disclosure of changes in the underlying risk within the GLB reinsurance programs for a given reporting period. d) Fixed maturities At March 31, 2016 , we have commitments to purchase fixed income securities of $243 million over the next several years. e) Other investments At March 31, 2016 , included in Other investments in the consolidated balance sheet are investments in limited partnerships and partially-owned investment companies with a carrying value of $3.4 billion. In connection with these investments, we have commitments that may require funding of up to $2.1 billion over the next several years. f) Taxation At March 31, 2016 , $19 million of unrecognized tax benefits remains outstanding. It is reasonably possible that over the next twelve months, the amount of unrecognized tax benefits may change resulting from the re-evaluation of unrecognized tax benefits arising from examinations of taxing authorities. With few exceptions, Chubb is no longer subject to state and local or non-U.S. income tax examinations for years before 2005. g) Legal proceedings Our insurance subsidiaries are subject to claims litigation involving disputed interpretations of policy coverages and, in some jurisdictions, direct actions by allegedly-injured persons seeking damages from policyholders. These lawsuits, involving claims on policies issued by our subsidiaries which are typical to the insurance industry in general and in the normal course of business, are considered in our loss and loss expense reserves. In addition to claims litigation, we are subject to lawsuits and regulatory actions in the normal course of business that do not arise from or directly relate to claims on insurance policies. This category of business litigation typically involves, among other things, allegations of underwriting errors or misconduct, employment claims, regulatory activity, or disputes arising from our business ventures. In the opinion of management, our ultimate liability for these matters could be, but we believe is not likely to be, material to our consolidated financial condition and results of operations.

Shareholders' equity

Shareholders' equity	3 Months Ended
Shareholders' equity	Mar. 31, 2016
Stockholders' Equity Note [Abstract]
Shareholders' equity	Shareholders’ equity All of Chubb’s Common Shares are authorized under Swiss corporate law. Though the par value of Common Shares is stated in Swiss francs, Chubb continues to use U.S. dollars as its reporting currency for preparing consolidated financial statements. Under Swiss corporate law, dividends, including distributions through a reduction in par value (par value reduction) or from legal reserves, must be stated in Swiss francs though dividend payments are made by Chubb in U.S. dollars. At March 31, 2016, our Common Shares had a par value of CHF 24.15 per share. At our May 2014 annual general meeting, our shareholders approved an annual dividend for the following year of $2.60 per share, payable in four quarterly installments of $0.65 per share after the annual general meeting in the form of a distribution by way of a par value reduction. At our May 2015 annual general meeting, our shareholders approved an annual dividend for the following year of up to $ 2.68 per share, which was paid in four quarterly installments of $ 0.67 per share at dates determined by the Board of Directors (Board) after the annual general meeting by way of a distribution from capital contribution reserves, transferred to free reserves for payment. The following table presents dividend distributions per Common Share in Swiss francs (CHF) and U.S. dollars (USD): Three Months Ended March 31 2016 2015 CHF USD CHF USD Dividends – par value reduction — $ 0.62 $ 0.65 Dividends – distributed from capital contribution reserves 0.66 0.67 — — Total dividend distributions per common share 0.66 $ 0.67 0.62 $ 0.65 Common Shares in treasury are used principally for issuance upon the exercise of employee stock options, grants of restricted stock, and purchases under the Employee Stock Purchase Plan (ESPP). At March 31, 2016 , 15,500,344 Common Shares remain in treasury after net shares redeemed under employee share-based compensation plans. Chubb Limited securities repurchase authorization In November 2014, the Board announced authorization of a share repurchase program of $1.5 billion of Chubb's Common Shares for the period January 1, 2015 through December 31, 2015 to replace the previous authorization when it expired on December 31, 2014. There are no outstanding repurchase authorizations subsequent to December 31, 2015. The following table presents repurchases of Chubb's Common Shares conducted in a series of open market transactions under the Board authorization: (in millions of U.S. dollars, except share data) Three Months Ended March 31 2016 2015 Number of shares repurchased — 3,027,463 Cost of shares repurchased $ — $ 340 Repurchase authorization remaining at end of period $ — $ 1,160

Share-based compensation

Share-based compensation	3 Months Ended
Share-based compensation	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation	Share-based compensation The ACE Limited 2004 Long-Term Incentive Plan (the 2004 LTIP) permits grants of both incentive and non-qualified stock options principally at an option price per share equal to the grant date fair value of Chubb's Common Shares. Stock options are generally granted with a 3-year vesting period and a 10-year term. Stock options typically vest in equal annual installments over the vesting period, which is also the requisite service period. On February 25, 2016 , Chubb granted 1,926,842 stock options with a weighted-average grant date fair value of $21.52 each. The fair value of the options issued is estimated on the grant date using the Black-Scholes option pricing model. The 2004 LTIP also permits grants of service-based restricted stock and restricted stock units as well as performance-based restricted stock awards. Chubb generally grants service-based restricted stock and restricted stock units with a 4-year vesting period, based on a graded vesting schedule. The performance-based stock awards comprise target awards which have four installments that vest annually based on tangible book value (shareholders' equity less goodwill and intangible assets) per share growth compared to a defined group of peer companies, and premium awards, which are earned only if tangible book value per share growth over the cumulative 4-year period after the grant of the associated target awards exceeds a higher threshold compared to our peer group. The restricted stock is granted at market close price on the grant date. On February 25, 2016 , Chubb granted 1,119,686 service-based restricted stock awards, 337,581 service-based restricted stock units, and 452,820 performance-based awards to employees and officers with a grant date fair value of $118.39 each. Each restricted stock unit represents our obligation to deliver to the holder one Common Share upon vesting. In connection with the Chubb Corp acquisition, we assumed outstanding equity awards consisting of service-based restricted stock units, performance-based restricted stock units, and stock options issued by Chubb Corporation to employees and directors with a fair value of approximately $525 million , of which $323 million is attributed to purchase consideration for the acquisition. These awards were generally granted with a 3-year vesting period, and the stock options generally have a 10-year term.

Postretirement benefits Postret

Postretirement benefits Postretirement benefits	3 Months Ended
Postretirement benefits Postretirement benefits	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Compensation and Employee Benefit Plans [Text Block]	Postretirement benefits We maintain non-contributory defined pension benefit plans and other postretirement plans that cover certain employees located in the U.S., Europe, Asia, Canada, and Mexico. All underlying plans are subject to periodic actuarial valuations by qualified actuarial firms using actuarial models to calculate the expense and liability for each plan. Components of the funded status of the pension and other postretirement benefit plans are included in Accounts payable, accrued expenses, and other liabilities in the consolidated balance sheets. Chubb provides pension benefits to eligible employees and their dependents through various defined contribution plans and defined benefit plans sponsored by Chubb. With the acquisition, Chubb assumed the outstanding pension obligations of Chubb Corp which consisted of several non-contributory defined benefit pension plans covering substantially all its employees. We also assumed the legacy Chubb Corp other postretirement benefits plans, principally health care and life insurance, to retired employees, their beneficiaries, and covered dependents. Health care coverage is contributory. Retiree contributions vary based upon retiree’s age, type of coverage, and years of service requirements. Life insurance coverage is non-contributory. Chubb funds a portion of the health care benefits obligation where such funding can be accomplished on a tax-effective basis. Benefits are paid as covered expenses are incurred. As part of purchase accounting, Chubb eliminated legacy Chubb Corp’s postretirement benefit costs not yet recognized in Net income that were recorded in Accumulated other comprehensive income at the time of the acquisition. In addition Chubb conformed the accounting policies for the acquired plans of Chubb Corp to the accounting policy of Chubb to select the applicable discount rates using specific spot rates along a yield curve determined by the projected cash flows assumptions. This resulted in a lower overall discount rate used to determine the benefit obligation and therefore increased that obligation at the date of the acquisition. At the date of the acquisition of Chubb Corp, we assumed the following postretirement benefit plan assets and obligations: Pension Benefits Other Postretirement Benefits U.S. Plans Non U.S. Plans Total U.S. Plans Non U.S. Plans Total (in millions of U.S. dollars) Fair value of plan assets $ 2,473 $ 315 $ 2,788 $ 138 $ — $ 138 Benefit obligation (3,153 ) (372 ) (3,525 ) (491 ) (15 ) (506 ) Funded status $ (680 ) $ (57 ) $ (737 ) $ (353 ) $ (15 ) $ (368 ) Chubb’s funding policy is to contribute amounts that meet regulatory requirements plus additional amounts determined based on actuarial valuations, market conditions and other factors. All benefit plans satisfy minimum funding requirements of the Employee Retirement Income Security Act of 1974 (ERISA). For the three months ended March 31, 2016, we contributed $ 27 million to our U.S. and non-U.S. pension and other postretirement benefits plans, and we estimate that we will contribute an additional $ 38 million for the remainder of 2016. These estimates are subject to change due to contribution decisions which are affected by various factors including our liquidity, market performance and management discretion. The following table summarizes the components of net periodic benefit costs for our pension and postretirement benefit plans recognized in the consolidated statements of operations: Pension Benefits Other Postretirement Benefits (in millions of U.S. dollars) U.S. Plans Non-U.S. Plans Total U.S. Plans Non-U.S. Plans Total Three months ended March 31, 2016 Net periodic benefit cost: Service cost $ 17 $ 5 $ 22 $ 2 $ — $ 2 Interest cost 27 8 35 5 — 5 Expected return on plan assets (37 ) (10 ) (47 ) (2 ) — (2 ) Amortization of unrecognized: Net actuarial loss — 1 1 — — — Net periodic benefit cost $ 7 $ 4 $ 11 $ 5 $ — $ 5 Three months ended March 31, 2015 Net periodic benefit cost: Service cost $ — $ 2 $ 2 Interest cost — 5 5 Expected return on plan assets — (7 ) (7 ) Amortization of unrecognized: Net actuarial loss — 1 1 Net periodic benefit cost $ — $ 1 $ 1 The weighted average assumptions used to determine net pension and other postretirement benefit costs were as follows: Pension Benefits Other Postretirement Benefits U.S. Plans Non-U.S. Plans U.S. Plans Non-U.S. Plans As of March 31, 2016 Discount rate 4.28 % 3.74 % 4.41 % 4.30 % Rate of compensation increase 4.00 % 3.40 % N/A N/A Expected long-term rate of return on plan assets 7.00 % 4.90 % 7.00 % N/A As of December 31, 2015 Discount rate N/A 3.51 % N/A N/A Rate of compensation increase N/A 3.09 % N/A N/A Expected long-term rate of return on plan assets N/A 4.81 % N/A N/A

Segment information

Segment information	3 Months Ended
Segment information	Mar. 31, 2016
Segment Reporting [Abstract]
Segment information	Segment information Effective the first quarter of 2016, we are reporting our financial results within the following business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. We have also redefined Corporate to include all run-off asbestos and environmental (A&E) exposures, the results of run-off Brandywine business, the results of Westchester specialty operations for 1996 and prior years and certain mass tort exposures. All legacy ACE prior period amounts (i.e., legacy Chubb Corp prior period results are not included in the prior period amounts in the tables below) have been adjusted to conform to the new segment presentation. • The North America Commercial P&C Insurance segment includes the business written by Chubb divisions that provide property and casualty (P&C) insurance and services to large, middle market and small commercial businesses in the U.S., Bermuda and Canada. These divisions write a variety of coverages, including traditional commercial property, marine, general casualty, workers’ compensation, package policies, and risk management; specialty categories such as professional lines, marine and construction risk, environmental and cyber risk, excess casualty, as well as group accident and health (A&H) insurance. The divisions included in this segment are North America Major Accounts, North America Commercial Insurance, Westchester and North America Small Commercial. • The North America Personal P&C Insurance segment includes the business written by Chubb’s North America Personal Risk Services division, which provides affluent and high net worth individuals and families with homeowners, automobile, valuables, umbrella and recreational marine insurance and services. • The North America Agricultural Insurance segment continues to include the business written by Rain and Hail Service, Inc. which provides comprehensive multiple peril crop and crop-hail insurance, and Chubb Agribusiness, which offers farm and ranch property as well as specialty P&C coverages, including commercial agriculture products. • The Overseas General Insurance segment includes the business written by two Chubb divisions that provide P&C insurance and services in the 51 countries outside of North America where the company operates. Chubb International provides commercial P&C traditional and specialty lines serving large corporations, middle market and small customers, A&H and traditional and specialty personal lines through retail brokers, agents and other channels locally around the world. Chubb Global Markets provides commercial P&C excess and surplus lines and A&H through wholesale brokers in the London market and through Lloyd’s. These divisions write a variety of coverages, including traditional commercial property and casualty, specialty categories such as financial lines, marine, energy, aviation, political risk and construction risk, as well as group A&H and traditional and specialty personal lines. • The Global Reinsurance segment primarily includes the reinsurance business written by Chubb Tempest Re as well as the legacy Chubb U.K. Assumed Reinsurance business, which is active, and the legacy Chubb run-off Reinsurance business. • There were no material changes to the Life Insurance segment, which continues to include the business written by Chubb Life, Chubb Tempest Life Re and Combined Insurance’s North America operations. The legacy Chubb life insurance business in Latin America was also included in this segment. Corporate primarily includes loss and loss expenses of asbestos and environmental (A&E) run-off liabilities, and the results of our non-insurance companies including Chubb Limited, Chubb Group Management and Holdings Ltd, and Chubb INA Holdings, Inc. Our exposure to A&E claims principally arises out of liabilities acquired when we purchased Westchester Specialty in 1998, CIGNA’s P&C business in 1999, and legacy Chubb Corp run-off business in 2016, and certain other mass tort exposures. In addition, effective the first quarter of 2016, revenue and expenses managed at the corporate level, including realized gains and losses, interest expense, other income and expenses, amortization of purchased intangibles, Chubb integration expenses, and income taxes will be reported within Corporate. The amortization of purchased intangibles includes amortization of agency distribution relationships and renewal rights, internally developed technology, and the fair value adjustment on acquired loss reserves. Also the amortization of fair value adjustments on acquired invested assets and debt associated with the Chubb Corp acquisition is considered a corporate cost and is therefore included in Corporate. These items will not be allocated to the segment level; therefore, the segment income statement will only include underwriting income and net investment income. The prior period has been revised to conform to the new segment presentation. Chubb integration expenses are one-time in nature and are not related to the on-going business activities of the segments. The Chief Executive Officer does not manage segment results or allocate resources to segments when considering these costs and they are therefore excluded from our definition of segment income. For segment reporting purposes, certain items have been presented in a different manner below than in the consolidated financial statements. Management uses underwriting income as the main measure of segment performance. Chubb calculates underwriting income by subtracting Losses and loss expenses, Policy benefits, Policy acquisition costs, and Administrative expenses from Net premiums earned. To calculate segment income, include net investment income. For the North America Agricultural segment, management includes gains and losses on crop derivatives as a component of underwriting income. For the Life Insurance segment, management includes (Gains) losses from fair value changes in separate account assets that do not qualify for separate account reporting under GAAP as components of Life Insurance segment income. For example, for the three months ended March 31, 2016 , Life segment income of $ 64 million includes losses from fair value changes in separate account assets of $ 3 million (reported within Other (income) expense in the Corporate column below). The following tables present the Statement of Operations by segment: For the Three Months Ended North America Commercial P&C Insurance North America Personal P&C Insurance North America Agricultural Insurance Overseas General Insurance Global Reinsurance Life Insurance Corporate Chubb Consolidated March 31, 2016 (in millions of U.S. dollars) Net premiums written $ 2,302 $ 871 $ 64 $ 2,041 $ 201 $ 516 $ — $ 5,995 Net premiums earned 2,896 1,024 23 1,955 202 497 — 6,597 Losses and loss expenses 1,747 661 (30 ) 1,021 89 177 9 3,674 Policy benefits — — — — — 126 — 126 Policy acquisition costs 482 249 4 503 53 122 — 1,413 Administrative expenses 266 88 (4 ) 263 14 72 73 772 Underwriting income (loss) 401 26 53 168 46 — (82 ) 612 Net investment income (loss) 426 47 5 146 67 67 (84 ) 674 Segment income (loss) 827 73 58 314 113 67 (166 ) 1,286 Net realized gains (losses) including OTTI (394 ) (394 ) Interest expense 146 146 Other (income) expense: (Gains) losses from fair value changes in separate account assets 3 3 Other 25 25 Amortization of purchased intangibles 7 7 Chubb integration expenses 148 148 Income tax expense 124 124 Net income (loss) $ (1,013 ) $ 439 For the Three Months Ended North America Commercial P&C Insurance North America Personal P&C Insurance North America Agricultural Insurance Overseas General Insurance Global Reinsurance Life Insurance Corporate Chubb Consolidated March 31, 2015 (in millions of U.S. dollars) Net premiums written $ 1,297 $ 133 $ 88 $ 1,794 $ 273 $ 491 $ — $ 4,076 Net premiums earned 1,380 146 64 1,637 226 474 — 3,927 Losses and loss expenses 915 111 22 814 99 152 9 2,122 Policy benefits — — — — — 142 — 142 Policy acquisition costs 130 31 (4 ) 389 54 107 — 707 Administrative expenses 151 19 (1 ) 256 12 73 44 554 Underwriting income (loss) 184 (15 ) 47 178 61 — (53 ) 402 Net investment income 258 5 6 138 75 66 3 551 Segment income (loss) 442 (10 ) 53 316 136 66 (50 ) 953 Net realized gains (losses) including OTTI (89 ) (89 ) Interest expense 68 68 Other (income) expense: (Gains) losses from fair value changes in separate account assets (11 ) (11 ) Other (24 ) (24 ) Amortization of purchased intangibles 30 30 Income tax expense 120 120 Net income (loss) $ (322 ) $ 681 Underwriting assets are reviewed in total by management for purposes of decision-making. Other than goodwill and other intangible assets, Chubb does not allocate assets to its segments.

Earnings per share

Earnings per share	3 Months Ended
Earnings per share	Mar. 31, 2016
Earnings Per Share [Abstract]
Earnings per share	Earnings per share Three Months Ended March 31 (in millions of U.S. dollars, except share and per share data) 2016 2015 Numerator: Net income $ 439 $ 681 Denominator: Denominator for basic earnings per share: Weighted-average shares outstanding 446,739,586 328,212,376 Denominator for diluted earnings per share: Share-based compensation plans 3,270,156 3,480,344 Weighted-average shares outstanding and assumed conversions 450,009,742 331,692,720 Basic earnings per share $ 0.98 $ 2.08 Diluted earnings per share $ 0.97 $ 2.05 Potential anti-dilutive share conversions 2,074,308 715,148 Excluded from weighted-average shares outstanding and assumed conversions is the impact of securities that would have been anti-dilutive during the respective periods.

Information provided in connect

Information provided in connection with outstanding debt of subsidiaries	3 Months Ended
	Mar. 31, 2016
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract]
Information provided in connection with outstanding debt of subsidiaries	Information provided in connection with outstanding debt of subsidiaries In connection with the Chubb Corp acquisition, Chubb INA Holdings Inc., entered into a series of intercompany loans totaling $10 billion involving its parents, Chubb Group Holdings Inc. and Chubb Limited. The weighted-average interest rate is 3.3 percent with fixed interest rates ranging from 2.3 percent to 4.35 percent and various maturity dates from 2021 to 2046. As part of the acquisition, Chubb INA Holdings Inc. assumed $3.3 billion par value outstanding debt of Chubb Corp, fair valued at $3.8 billion. Chubb INA Holdings Inc. assumed Chubb Corp's rights, duties and obligations and Chubb Limited fully and unconditionally guarantees Chubb INA Holding Inc.'s payment obligations under these debts. The following tables present condensed consolidating financial information at March 31, 2016 and December 31, 2015 , and for the three months ended March 31, 2016 and 2015 for Chubb Limited (Parent Guarantor) and Chubb INA Holdings Inc. (Subsidiary Issuer). The transactions noted above are reflected in the tables below. The Subsidiary Issuer is an indirect 100 percent-owned subsidiary of the Parent Guarantor. The Parent Guarantor fully and unconditionally guarantees certain of the debt of the Subsidiary Issuer. Condensed consolidating financial information of the Parent Guarantor and Subsidiary Issuer are presented on the equity method of accounting. The revenues and expenses and cash flows of the subsidiaries of the Subsidiary Issuer are presented in the Other Chubb Limited Subsidiaries column on a combined basis. Condensed Consolidating Balance Sheet at March 31, 2016 (in millions of U.S. dollars) Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated Assets Investments $ 29 $ 643 $ 96,914 $ — $ 97,586 Cash (1) 2 3 2,406 (1,320 ) 1,091 Insurance and reinsurance balances receivable — — 10,884 (3,192 ) 7,692 Reinsurance recoverable on losses and loss expenses — — 22,065 (9,174 ) 12,891 Reinsurance recoverable on policy benefits — — 1,144 (959 ) 185 Value of business acquired — — 390 — 390 Goodwill and other intangible assets — — 23,359 — 23,359 Investments in subsidiaries 35,426 49,240 — (84,666 ) — Due from subsidiaries and affiliates, net 11,267 — — (11,267 ) — Other assets 4 503 17,291 (4,348 ) 13,450 Total assets $ 46,728 $ 50,389 $ 174,453 $ (114,926 ) $ 156,644 Liabilities Unpaid losses and loss expenses $ — $ — $ 68,917 $ (8,711 ) $ 60,206 Unearned premiums — — 18,522 (3,626 ) 14,896 Future policy benefits — — 5,828 (959 ) 4,869 Due to subsidiaries and affiliates, net — 11,199 68 (11,267 ) — Affiliated notional cash pooling programs (1) 521 799 — (1,320 ) — Repurchase agreements — — 1,403 — 1,403 Short-term debt — 500 — — 500 Long-term debt — 12,625 11 — 12,636 Trust preferred securities — 308 — — 308 Other liabilities 310 1,575 18,421 (4,377 ) 15,929 Total liabilities 831 27,006 113,170 (30,260 ) 110,747 Total shareholders’ equity 45,897 23,383 61,283 (84,666 ) 45,897 Total liabilities and shareholders’ equity $ 46,728 $ 50,389 $ 174,453 $ (114,926 ) $ 156,644 (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 , the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Balance Sheet at December 31, 2015 (in millions of U.S. dollars) Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated Assets Investments $ 28 $ 7,839 $ 58,384 $ — $ 66,251 Cash (1) 1 2 2,743 (971 ) 1,775 Insurance and reinsurance balances receivable — — 6,075 (752 ) 5,323 Reinsurance recoverable on losses and loss expenses — — 20,124 (8,738 ) 11,386 Reinsurance recoverable on policy benefits — — 1,129 (942 ) 187 Value of business acquired — — 395 — 395 Goodwill and other intangible assets — — 5,683 — 5,683 Investments in subsidiaries 29,612 18,386 — (47,998 ) — Due from subsidiaries and affiliates, net 644 1,800 — (2,444 ) — Other assets 8 457 14,434 (3,593 ) 11,306 Total assets $ 30,293 $ 28,484 $ 108,967 $ (65,438 ) $ 102,306 Liabilities Unpaid losses and loss expenses $ — $ — $ 45,490 $ (8,187 ) $ 37,303 Unearned premiums — — 10,243 (1,804 ) 8,439 Future policy benefits — — 5,749 (942 ) 4,807 Due to subsidiaries and affiliates, net — — 2,444 (2,444 ) — Affiliated notional cash pooling programs (1) 882 89 — (971 ) — Repurchase agreements — — 1,404 — 1,404 Long-term debt — 9,378 11 — 9,389 Trust preferred securities — 307 — — 307 Other liabilities 276 1,422 12,916 (3,092 ) 11,522 Total liabilities 1,158 11,196 78,257 (17,440 ) 73,171 Total shareholders’ equity 29,135 17,288 30,710 (47,998 ) 29,135 Total liabilities and shareholders’ equity $ 30,293 $ 28,484 $ 108,967 $ (65,438 ) $ 102,306 (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2015 , the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Statements of Operations and Comprehensive Income For the Three Months Ended March 31, 2016 Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 5,995 $ — $ 5,995 Net premiums earned — — 6,597 — 6,597 Net investment income 1 4 669 — 674 Equity in earnings of subsidiaries 375 506 — (881 ) — Net realized gains (losses) including OTTI — — (394 ) — (394 ) Losses and loss expenses — — 3,674 — 3,674 Policy benefits — — 126 — 126 Policy acquisition costs and administrative expenses 17 36 2,132 — 2,185 Interest (income) expense (80 ) 215 11 — 146 Other (income) expense (9 ) 10 27 — 28 Amortization of purchased intangibles — — 7 — 7 Chubb integration expenses 3 137 8 — 148 Income tax expense (benefit) 6 (150 ) 268 — 124 Net income $ 439 $ 262 $ 619 $ (881 ) $ 439 Comprehensive income (loss) $ 1,541 $ 1,056 $ 1,721 $ (2,777 ) $ 1,541 Condensed Consolidating Statements of Operations and Comprehensive Income For the Three Months Ended March 31, 2015 Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 4,076 $ — $ 4,076 Net premiums earned — — 3,927 — 3,927 Net investment income 1 1 549 — 551 Equity in earnings of subsidiaries 648 204 — (852 ) — Net realized gains (losses) including OTTI — — (89 ) — (89 ) Losses and loss expenses — — 2,122 — 2,122 Policy benefits — — 142 — 142 Policy acquisition costs and administrative expenses 14 6 1,241 — 1,261 Interest (income) expense (8 ) 69 7 — 68 Other (income) expense (41 ) (3 ) 9 — (35 ) Amortization of purchased intangibles — — 30 — 30 Income tax expense (benefit) 3 (26 ) 143 — 120 Net income $ 681 $ 159 $ 693 $ (852 ) $ 681 Comprehensive income $ 642 $ 24 $ 654 $ (678 ) $ 642 Condensed Consolidating Statement of Cash Flows For the Three Months Ended March 31, 2016 Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Consolidating Adjustments and Eliminations Chubb Limited Consolidated (in millions of U.S. dollars) Net cash flows from operating activities $ 3,272 $ 3,109 $ 1,011 $ (6,372 ) $ 1,020 Cash flows from investing activities Purchases of fixed maturities available for sale — — (8,104 ) — (8,104 ) Purchases of fixed maturities held to maturity — — (77 ) — (77 ) Purchases of equity securities — — (33 ) — (33 ) Sales of fixed maturities available for sale — — 6,329 — 6,329 Sales of equity securities — — 761 — 761 Maturities and redemptions of fixed maturities available for sale — — 1,553 — 1,553 Maturities and redemptions of fixed maturities held to maturity — — 249 — 249 Net change in short-term investments — 7,788 4,144 — 11,932 Net derivative instruments settlements — — (22 ) — (22 ) Acquisition of subsidiaries (net of cash acquired of $57) — (14,282 ) 20 — (14,262 ) Capital contribution (2,330 ) — (2,330 ) 4,660 — Other — — 59 — 59 Net cash flows (used for) from investing activities (2,330 ) (6,494 ) 2,549 4,660 (1,615 ) Cash flows from financing activities Dividends paid on Common Shares (218 ) — — — (218 ) Proceeds from issuance of repurchase agreements — — 853 — 853 Repayment of repurchase agreements — — (853 ) — (853 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 51 — 51 Dividend to parent company — — (6,372 ) 6,372 — Advances (to) from affiliates (362 ) 350 12 — — Capital contribution — 2,330 2,330 (4,660 ) — Net proceeds from (payments to) affiliated notional cash pooling programs (1) (361 ) 710 — (349 ) — Policyholder contract deposits — — 118 — 118 Policyholder contract withdrawals — — (49 ) — (49 ) Other — (4 ) — — (4 ) Net cash flows (used for) from financing activities (941 ) 3,386 (3,910 ) 1,363 (102 ) Effect of foreign currency rate changes on cash and cash equivalents — — 13 — 13 Net increase (decrease) in cash 1 1 (337 ) (349 ) (684 ) Cash – beginning of period (1) 1 2 2,743 (971 ) 1,775 Cash – end of period (1) $ 2 $ 3 $ 2,406 $ (1,320 ) $ 1,091 (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 and December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Statement of Cash Flows For the Three Months Ended March 31, 2015 Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated (in millions of U.S. dollars) Net cash flows from operating activities $ 48 $ 4 $ 1,023 $ — $ 1,075 Cash flows from investing activities Purchases of fixed maturities available for sale — — (4,336 ) — (4,336 ) Purchases of fixed maturities held to maturity — — (21 ) — (21 ) Purchases of equity securities — — (39 ) — (39 ) Sales of fixed maturities available for sale — — 2,002 — 2,002 Sales of equity securities — — 28 — 28 Maturities and redemptions of fixed maturities available for sale — — 1,481 — 1,481 Maturities and redemptions of fixed maturities held to maturity — — 324 — 324 Net change in short-term investments — 216 (471 ) — (255 ) Net derivative instruments settlements — — (51 ) — (51 ) Other — — (153 ) — (153 ) Net cash flows from (used for) investing activities — 216 (1,236 ) — (1,020 ) Cash flows from financing activities Dividends paid on Common Shares (214 ) — — — (214 ) Common Shares repurchased — — (347 ) — (347 ) Proceeds from issuance of long-term debt — 800 — — 800 Proceeds from issuance of short-term debt — — 477 — 477 Repayment of short-term debt — — (477 ) — (477 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 39 — 39 Advances (to) from affiliates 336 (340 ) 4 — — Net proceeds from (payments to) affiliated notional cash pooling programs (1) (168 ) (309 ) — 477 — Policyholder contract deposits 101 101 Policyholder contract withdrawals — — (40 ) — (40 ) Other — (6 ) — — (6 ) Net cash flows (used for) from financing activities (46 ) 145 (243 ) 477 333 Effect of foreign currency rate changes on cash and cash equivalents — — (95 ) — (95 ) Net increase (decrease) in cash 2 365 (551 ) 477 293 Cash – beginning of period (1) — 1 1,209 (555 ) 655 Cash – end of period (1) $ 2 $ 366 $ 658 $ (78 ) $ 948 (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

General (Policies)

General (Policies)	3 Months Ended
General (Policies)	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of presentation	a) Basis of presentation On January 14, 2016, we completed the acquisition of The Chubb Corporation (Chubb Corp acquisition), creating a global leader in property and casualty insurance. We have changed our name from ACE Limited to Chubb Limited and plan to adopt the Chubb name globally, although some subsidiaries may continue to use ACE as a part of their name. Chubb Limited is a holding company incorporated in Zurich, Switzerland. Chubb Limited, through its subsidiaries, provides a broad range of insurance and reinsurance products to insureds worldwide. Effective the first quarter of 2016, our results are reported through the following business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. This reflects our significantly larger and expanded operations subsequent to our acquisition of The Chubb Corporation (Chubb Corp). We have also redefined Corporate to include all run-off asbestos and environmental (A&E) exposures, the results of its run-off Brandywine business, the results of Westchester specialty operations for 1996 and prior years and certain mass tort exposures. Prior period amounts of Chubb Limited (i.e., excluding the historical results of Chubb Corp) contained in this report have been adjusted to conform to the new segment presentation. Refer to Note 12 for additional information. The interim unaudited consolidated financial statements, which include the accounts of Chubb Limited and its subsidiaries (collectively, Chubb, we, us, or our), have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) and, in the opinion of management, reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of the results and financial position for such periods. All significant intercompany accounts and transactions, including internal reinsurance transactions, have been eliminated. The results of operations and cash flows of Chubb Corp are included from the acquisition date forward (i.e., after January 14, 2016). The results of operations and cash flows for any interim period are not necessarily indicative of the results for the full year. These consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in our 2015 Form 10-K.
Accounting guidance adopted in 2015	b) Accounting guidance adopted in 2016 Presentation of Debt Issuance Costs In April 2015, the Financial Accounting Standard Board (FASB) issued new guidance related to the accounting for debt issuance costs. The new guidance requires presentation of debt issuance costs in the Consolidated balance sheets as a reduction of the carrying amount of the related debt liability instead of as a deferred charge. We retrospectively adopted this guidance effective January 1, 2016 and reclassified $ 60 million of debt issuance costs from Other assets to Long term debt ($ 58 million ) and Trust preferred securities ($ 2 million ) as of December 31, 2015.
Accounting guidance not yet adopted	c) Accounting guidance not yet adopted Revenue from Contracts with Customers In May 2014, the FASB issued an accounting standard that supersedes most existing revenue recognition guidance. The standard excludes from its scope the accounting for insurance contracts, leases, financial instruments, and certain other agreements that are governed under other GAAP guidance, but could affect the revenue recognition for certain of our claims management and risk control services. The updated guidance requires an entity to recognize revenue as performance obligations are met, in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity is entitled to receive for those goods or services. The standard is effective for us in the first quarter of 2018 with early adoption permitted. The adoption of this guidance is not expected to have a material impact on our financial condition or results of operations. Short-Duration Contracts In May 2015, the FASB issued guidance that requires additional disclosures for short-duration insurance contracts. New disclosure will be required to provide more information about initial claim estimates and subsequent adjustments to those estimates, the methodologies and judgments used to estimate claims, and the timing, frequency, and severity of claims. The guidance is effective for us beginning with our 2016 annual reporting on Form 10-K. The guidance requires a change in disclosure only and adoption of this guidance will not have an impact on our financial condition or results of operations.

Acquisitions Acquisitions (Tabl

Acquisitions Acquisitions (Tables)	3 Months Ended
Acquisitions Acquisitions (Tables)	Mar. 31, 2016
Acquisition [Abstract]
Schedule of Assets Acquired and Liabilities Assumed in the Chubb Corp Acquisition [Table Text Block]	(in millions, except per share data) Purchase consideration Chubb Limited common shares Chubb Corp common shares outstanding 228 Per share exchange ratio 0.6019 Common shares issued by Chubb Limited 137 Common share price of Chubb Limited at January 14, 2016 $ 111.02 Fair value of common shares issued by Chubb Limited to common shareholders of Chubb Corp $ 15,204 Cash consideration Chubb Corp common shares outstanding 228 Agreed cash price per share paid to common shareholders of Chubb Corp $ 62.93 Cash consideration paid by Chubb Limited to common shareholders of Chubb Corp $ 14,319 Stock-based awards Fair value of equity awards issued (1) $ 323 Fair value of purchase consideration $ 29,846 Preliminary estimate of assets acquired and (liabilities) assumed Cash $ 57 Investments 42,869 Accrued investment income 337 Insurance and reinsurance balances receivable 2,948 Reinsurance recoverable on losses and loss expenses 1,657 Indefinite lived intangible assets 2,860 Finite lived intangible assets 4,795 Prepaid reinsurance premiums 280 Other assets 989 Unpaid losses and loss expenses (22,878 ) Unearned premium (7,016 ) Insurance and reinsurance balances payable (468 ) Accounts payable, accrued expenses, and other liabilities (1,919 ) Deferred tax liabilities (1,350 ) Long-term debt (3,760 ) Total identifiable net assets acquired 19,401 Goodwill 10,445 Purchase price $ 29,846 (1) The estimated fair value of the replacement equity awards was $525 million, of which $323 million was attributed to service periods prior to the acquisition and was included in the purchase consideration. Refer to Note 10 for further information on these replacement equity awards.
Results of Operations From Date of Business Combination [Table Text Block]	The following table summarizes the results of the acquired Chubb Corp operations since the acquisition date that have been included within our consolidated statements of income: (in millions of U.S. dollars) January 14, 2016 to March 31, 2016 Total revenues $ 2,487 Net income $ 255
Pro Forma Financial Information for the Chubb Corp Acquisition [Table Text Block]	rience after the transaction. Three Months Ended March 31 (in millions of U.S. dollars, except per share data) 2016 2015 Total revenues $ 7,322 $ 7,695 Net income $ 534 $ 959 Earnings per share Basic earnings per share $ 1.14 $ 2.05 Diluted earnings per share $ 1.14 $ 2.03

Investments (Tables)

Investments (Tables)	3 Months Ended
Investments (Tables)	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Schedule Of Amortized Cost And Fair Value Of Fixed Maturities And Related OTTI Recognized In AOCI	March 31, 2016 Amortized Cost Gross Unrealized Appreciation Gross Unrealized Depreciation Fair Value OTTI Recognized in AOCI (in millions of U.S. dollars) Available for sale U.S. Treasury and agency $ 2,984 $ 85 $ — $ 3,069 $ — Foreign 20,026 685 (118 ) 20,593 (16 ) Corporate securities 21,783 640 (212 ) 22,211 (21 ) Mortgage-backed securities 11,766 289 (10 ) 12,045 (1 ) States, municipalities, and political subdivisions 19,432 200 (12 ) 19,620 — $ 75,991 $ 1,899 $ (352 ) $ 77,538 $ (38 ) Held to maturity U.S. Treasury and agency $ 700 $ 23 $ — $ 723 $ — Foreign 749 38 (4 ) 783 — Corporate securities 2,951 98 (16 ) 3,033 — Mortgage-backed securities 1,652 65 (1 ) 1,716 — States, municipalities, and political subdivisions 5,228 99 (2 ) 5,325 — $ 11,280 $ 323 $ (23 ) $ 11,580 $ — December 31, 2015 Amortized Cost Gross Unrealized Appreciation Gross Unrealized Depreciation Fair Value OTTI Recognized in AOCI (in millions of U.S. dollars) Available for sale U.S. Treasury and agency $ 2,481 $ 52 $ (5 ) $ 2,528 $ — Foreign 13,190 468 (213 ) 13,445 (13 ) Corporate securities 15,028 355 (454 ) 14,929 (28 ) Mortgage-backed securities 9,827 183 (52 ) 9,958 (1 ) States, municipalities, and political subdivisions 2,623 110 (6 ) 2,727 — $ 43,149 $ 1,168 $ (730 ) $ 43,587 $ (42 ) Held to maturity U.S. Treasury and agency $ 733 $ 13 $ (1 ) $ 745 $ — Foreign 763 30 (8 ) 785 — Corporate securities 3,054 57 (55 ) 3,056 — Mortgage-backed securities 1,707 38 (2 ) 1,743 — States, municipalities, and political subdivisions 2,173 52 (2 ) 2,223 — $ 8,430 $ 190 $ (68 ) $ 8,552 $ —
Schedule Of Fixed Maturities By Contractual Maturity	March 31 December 31 2016 2015 (in millions of U.S. dollars) Amortized Cost Fair Value Amortized Cost Fair Value Available for sale Due in 1 year or less $ 3,712 $ 3,724 $ 1,856 $ 1,865 Due after 1 year through 5 years 25,064 25,492 14,936 15,104 Due after 5 years through 10 years 25,453 25,887 12,258 12,173 Due after 10 years 9,996 10,390 4,272 4,487 64,225 65,493 33,322 33,629 Mortgage-backed securities 11,766 12,045 9,827 9,958 $ 75,991 $ 77,538 $ 43,149 $ 43,587 Held to maturity Due in 1 year or less $ 425 $ 429 $ 492 $ 495 Due after 1 year through 5 years 2,505 2,597 2,443 2,517 Due after 5 years through 10 years 2,918 2,991 2,292 2,313 Due after 10 years 3,780 3,847 1,496 1,484 9,628 9,864 6,723 6,809 Mortgage-backed securities 1,652 1,716 1,707 1,743 $ 11,280 $ 11,580 $ 8,430 $ 8,552
Schedule Of Cost And Fair Value Of Equity Securities	March 31 December 31 (in millions of U.S. dollars) 2016 2015 Cost $ 841 $ 441 Gross unrealized appreciation 84 74 Gross unrealized depreciation (32 ) (18 ) Fair value $ 893 $ 497
Schedule Of Net Realized Gains (Losses) And The Losses Included In Net Realized Gains (Losses) And OCI	Three Months Ended March 31 (in millions of U.S. dollars) 2016 2015 Fixed maturities: OTTI on fixed maturities, gross $ (67 ) $ (13 ) OTTI on fixed maturities recognized in OCI (pre-tax) 8 — OTTI on fixed maturities, net (59 ) (13 ) Gross realized gains excluding OTTI 65 44 Gross realized losses excluding OTTI (196 ) (35 ) Total fixed maturities (190 ) (4 ) Equity securities: OTTI on equity securities (1 ) — Gross realized gains excluding OTTI 40 3 Gross realized losses excluding OTTI (1 ) (2 ) Total equity securities 38 1 OTTI on other investments (3 ) — Foreign exchange gains (losses) 39 (31 ) Investment and embedded derivative instruments (39 ) 1 Fair value adjustments on insurance derivative (228 ) (45 ) S&P put options and futures (15 ) (12 ) Other derivative instruments (2 ) — Other 6 1 Net realized gains (losses) $ (394 ) $ (89 )
Schedule Of Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which A Portion Of OTTI Was Recognized In OCI	Three Months Ended March 31 (in millions of U.S. dollars) 2016 2015 Balance of credit losses related to securities still held – beginning of period $ 53 $ 28 Additions where no OTTI was previously recorded 11 3 Additions where an OTTI was previously recorded 6 1 Reductions for securities sold during the period (13 ) (10 ) Balance of credit losses related to securities still held – end of period $ 57 $ 22
Schedule Of Aggregate Fair Value And Gross Unrealized Loss By Length Of Time The Security Has Continuously Been In An Unrealized Loss Position	0 – 12 Months Over 12 Months Total March 31, 2016 Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss (in millions of U.S. dollars) Foreign $ 3,204 $ (69 ) $ 486 $ (53 ) $ 3,690 $ (122 ) Corporate securities 4,014 (152 ) 651 (76 ) 4,665 (228 ) Mortgage-backed securities 1,190 (4 ) 854 (7 ) 2,044 (11 ) States, municipalities, and political subdivisions 3,848 (12 ) 73 (2 ) 3,921 (14 ) Total fixed maturities 12,256 (237 ) 2,064 (138 ) 14,320 (375 ) Equity securities 310 (32 ) — — 310 (32 ) Other investments 229 (18 ) — — 229 (18 ) Total $ 12,795 $ (287 ) $ 2,064 $ (138 ) $ 14,859 $ (425 ) 0 – 12 Months Over 12 Months Total December 31, 2015 Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss (in millions of U.S. dollars) U.S. Treasury and agency $ 996 $ (5 ) $ 153 $ (1 ) $ 1,149 $ (6 ) Foreign 3,953 (148 ) 436 (73 ) 4,389 (221 ) Corporate securities 7,518 (371 ) 738 (138 ) 8,256 (509 ) Mortgage-backed securities 3,399 (42 ) 516 (12 ) 3,915 (54 ) States, municipalities, and political subdivisions 556 (6 ) 42 (2 ) 598 (8 ) Total fixed maturities 16,422 (572 ) 1,885 (226 ) 18,307 (798 ) Equity securities 131 (18 ) — — 131 (18 ) Other investments 210 (11 ) — — 210 (11 ) Total $ 16,763 $ (601 ) $ 1,885 $ (226 ) $ 18,648 $ (827 )
Schedule Of Components Of Restricted Assets	March 31 December 31 (in millions of U.S. dollars) 2016 2015 Trust funds $ 11,681 $ 11,862 Deposits with non-U.S. regulatory authorities 2,260 2,075 Deposits with U.S. regulatory authorities 2,523 1,242 Assets pledged under repurchase agreements 1,473 1,459 Other pledged assets 400 392 $ 18,337 $ 17,030

Fair value measurements (Tables

Fair value measurements (Tables)	3 Months Ended
Fair value measurements (Tables)	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Financial Instruments Measured At Fair Value On A Recurring Basis	March 31, 2016 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available for sale U.S. Treasury and agency $ 2,444 $ 625 $ — $ 3,069 Foreign — 20,531 62 20,593 Corporate securities — 21,950 261 22,211 Mortgage-backed securities — 11,997 48 12,045 States, municipalities, and political subdivisions — 19,620 — 19,620 2,444 74,723 371 77,538 Equity securities 864 — 29 893 Short-term investments 1,405 1,977 — 3,382 Other investments (1) 362 237 211 810 Securities lending collateral — 1,003 — 1,003 Investment derivative instruments 11 — — 11 Other derivative instruments — — — — Separate account assets 1,499 90 — 1,589 Total assets measured at fair value (1) $ 6,585 $ 78,030 $ 611 $ 85,226 Liabilities: Investment derivative instruments $ 23 $ — $ — $ 23 Other derivative instruments 36 — 10 46 GLB (2) — — 839 839 Total liabilities measured at fair value $ 59 $ — $ 849 $ 908 (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $ 3,658 million and other investments of $ 25 million at March 31, 2016 measured using NAV. (2) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information. December 31, 2015 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available for sale U.S. Treasury and agency $ 1,712 $ 816 $ — $ 2,528 Foreign — 13,388 57 13,445 Corporate securities — 14,755 174 14,929 Mortgage-backed securities — 9,905 53 9,958 States, municipalities, and political subdivisions — 2,727 — 2,727 1,712 41,591 284 43,587 Equity securities 481 — 16 497 Short-term investments 7,171 3,275 — 10,446 Other investments (1) 347 230 212 789 Securities lending collateral — 1,046 — 1,046 Investment derivative instruments 12 — — 12 Separate account assets 1,464 88 — 1,552 Total assets measured at fair value (1) $ 11,187 $ 46,230 $ 512 $ 57,929 Liabilities: Investment derivative instruments $ 13 $ — $ — $ 13 Other derivative instruments 4 — 6 10 GLB (2) — — 609 609 Total liabilities measured at fair value $ 17 $ — $ 615 $ 632 (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $2,477 million and other investments of $25 million at December 31, 2015 measured using NAV. (2) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information.
Fair Value And Maximum Future Funding Commitments Related To Investments	March 31 December 31 Expected Liquidation Period of Underlying Assets 2016 2015 (in millions of U.S. dollars) Fair Value Maximum Future Funding Commitments Fair Value Maximum Future Funding Commitments Financial 5 to 9 Years $ 580 $ 210 $ 300 $ 105 Real Assets 3 to 7 Years 577 321 474 140 Distressed 5 to 9 Years 451 217 261 218 Private Credit 3 to 7 Years 272 349 265 209 Traditional 3 to 9 Years 1,498 1,001 895 152 Vintage 1 to 2 Years 36 14 13 — Investment funds Not Applicable 244 — 269 — $ 3,658 $ 2,112 $ 2,477 $ 824
Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations	(in millions of U.S. dollars, except for percentages) Fair Value Valuation Technique Significant Unobservable Inputs Ranges March 31, 2016 December 31, 2015 GLB (1) $ 839 $ 609 Actuarial model Lapse rate 1% – 30% Annuitization rate 0% – 55% (1) Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 4 a) Guaranteed living benefits.
Financial Instruments Measured At Fair Value Using Significant Unobservable Inputs	Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity securities Other investments Other derivative instruments GLB (1) March 31, 2016 Foreign Corporate securities MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 57 $ 174 $ 53 $ 16 $ 212 $ 6 $ 609 Transfers into Level 3 6 16 — — — — — Transfers out of Level 3 (2 ) — — — — — — Change in Net Unrealized Gains (Losses) included in OCI 6 2 — — — — — Net Realized Gains/Losses (5 ) (6 ) — — — 2 230 Purchases (2) 5 93 — 13 6 2 — Sales (1 ) (14 ) (5 ) — — — — Settlements (4 ) (4 ) — — (7 ) — — Balance–End of Period $ 62 $ 261 $ 48 $ 29 $ 211 $ 10 $ 839 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (4 ) $ (7 ) $ — $ — $ — $ 2 $ 230 (1) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information. (2) Includes acquired invested assets as a result of the Chubb Corp acquisition. Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity Other Other derivative instruments GLB (1) March 31, 2015 Foreign Corporate MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 22 $ 187 $ 15 $ 2 $ 204 $ 4 $ 406 Transfers into Level 3 — 1 — — — — — Change in Net Unrealized Gains (Losses) included in OCI — 3 — — (2 ) — — Net Realized Gains/Losses — (3 ) — — — — 45 Purchases 1 8 18 — 9 — — Sales (1 ) (3 ) — — — — — Settlements — (26 ) — — (3 ) — — Balance–End of Period $ 22 $ 167 $ 33 $ 2 $ 208 $ 4 $ 451 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ (2 ) $ — $ — $ — $ — $ 45 (1) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. The liability for GLB reinsurance was $716 million at March 31, 2015 , and $663 million at December 31, 2014, which includes a fair value derivative adjustment of $451 million and $406 million, respectively.
Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value	March 31, 2016 Fair Value Carrying Value (in millions of U.S. dollars) Level 1 Level 2 Level 3 Total Assets: Fixed maturities held to maturity U.S. Treasury and agency $ 598 $ 125 $ — $ 723 $ 700 Foreign — 783 — 783 749 Corporate securities — 3,020 13 3,033 2,951 Mortgage-backed securities — 1,716 — 1,716 1,652 States, municipalities, and political subdivisions — 5,325 — 5,325 5,228 Total assets $ 598 $ 10,969 $ 13 $ 11,580 $ 11,280 Liabilities: Repurchase agreements $ — $ 1,403 $ — $ 1,403 $ 1,403 Short-term debt — 519 — 519 500 Long-term debt — 13,317 — 13,317 12,636 Trust preferred securities — 433 — 433 308 Total liabilities $ — $ 15,672 $ — $ 15,672 $ 14,847 December 31, 2015 Fair Value Carrying Value (in millions of U.S. dollars) Level 1 Level 2 Level 3 Total Assets: Fixed maturities held to maturity U.S. Treasury and agency $ 583 $ 162 $ — $ 745 $ 733 Foreign — 785 — 785 763 Corporate securities — 3,042 14 3,056 3,054 Mortgage-backed securities — 1,743 — 1,743 1,707 States, municipalities, and political subdivisions — 2,223 — 2,223 2,173 Total assets $ 583 $ 7,955 $ 14 $ 8,552 $ 8,430 Liabilities: Repurchase agreements $ — $ 1,404 $ — $ 1,404 $ 1,404 Long-term debt — 9,678 — 9,678 9,389 Trust preferred securities — 446 — 446 307 Total liabilities $ — $ 11,528 $ — $ 11,528 $ 11,100

Assumed life reinsurance prog28

Assumed life reinsurance programs involving minimum benefit guarantees under annuity contracts (Tables)	3 Months Ended
	Mar. 31, 2016
Reinsurance Disclosures [Abstract]
Schedule Of Guaranteed Minimum Death Benefits And Guaranteed Minimum Income Benefits Income And Expense	Three Months Ended March 31 (in millions of U.S. dollars) 2016 2015 GMDB Net premiums earned $ 14 $ 16 Policy benefits and other reserve adjustments $ 8 $ 9 GLB Net premiums earned $ 29 $ 32 Policy benefits and other reserve adjustments 11 12 Net realized gains (losses) (234 ) (45 ) Loss recognized in Net income $ (216 ) $ (25 ) Less: Net cash received 18 28 Net increase in liability $ (234 ) $ (53 )

Goodwill and other intangible29

Goodwill and other intangible assets Goodwill and other intangible assets (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	The following table presents a roll-forward of Goodwill by segment: (in millions of U.S. dollars) North America Commercial P&C Insurance North America Personal P&C Insurance North America Agricultural Insurance Overseas General Insurance Global Reinsurance Life Insurance Chubb Consolidated Balance at December 31, 2015 $ 1,203 $ 196 $ 134 $ 2,078 $ 365 $ 820 $ 4,796 Acquisition of Chubb Corp 5,667 2,025 — 2,753 — — 10,445 Foreign exchange revaluation and other 40 13 — 109 — 1 163 Balance at March 31, 2016 $ 6,910 $ 2,234 $ 134 $ 4,940 $ 365 $ 821 $ 15,404
Intangible assets acquired as part of Chubb Corp acquisition	(in millions of U.S. dollars) Amount Estimated useful life Definite life Unearned premium reserves (UPR) intangible asset $ 1,550 1 year Agency distribution relationships and renewal rights 3,150 24 years Internally developed technology 95 3 years Indefinite life Trademarks 2,800 Indefinite Licenses 50 Indefinite Syndicate capacity 10 Indefinite Total identified intangible assets $ 7,655
Intangible Asset Amortization for the Next 5 Years [Table Text Block]	Associated with the Chubb Corp Acquisition For the Year Ending December 31 (in millions of U.S. dollars) Agency distribution relationships and renewal rights Internally developed technology Fair Value adjustment to Unpaid losses and loss expense Total Other intangible assets Total amortization of purchased intangibles Second quarter of 2016 $ 33 $ 8 $ (61 ) $ (20 ) $ 21 $ 1 Third quarter of 2016 33 8 (61 ) (20 ) 21 1 Fourth quarter of 2016 33 8 (61 ) (20 ) 21 1 2017 293 32 (160 ) 165 79 244 2018 320 32 (101 ) 251 70 321 2019 279 — (62 ) 217 64 281 2020 239 — (35 ) 204 58 262 2021 216 — (20 ) 196 52 248 Total $ 1,446 $ 88 $ (561 ) $ 973 $ 386 $ 1,359
Future Changes in Deferred Tax Liabilities Resulting From Amortization of Intangible Assets [Table Text Block]	Chubb Corp acquisition For the Year Ending December 31 Reduction to deferred tax liability associated with other intangibles Amortization of UPR intangible asset to be recorded through Policy acquisition costs on the income statement Second quarter of 2016 $ (196 ) $ 518 Third quarter of 2016 (126 ) 319 Fourth quarter of 2016 (65 ) 143 2017 (114 ) — 2018 (123 ) — 2019 (98 ) — 2020 (84 ) — 2021 (75 ) — Total $ (881 ) $ 980

Debt (Tables)

Debt (Tables)	3 Months Ended
Debt (Tables)	Mar. 31, 2016
Debt Disclosure [Abstract]
Schedule of Debt [Table Text Block]	March 31 December 31 (in millions of U.S. dollars) 2016 2015 Early Redemption Option Repurchase agreements (weighted average interest rate of 0.8% in 2016 and 0.6% in 2015) $ 1,403 $ 1,404 None Short-term debt Chubb INA senior notes: $500 million 5.7% due February 2017 $ 500 $ — Make-whole premium plus 0.20% Total short-term debt $ 500 $ — Long-term debt Chubb INA senior notes: $500 million 5.7% due February 2017 $ — $ 500 Make-whole premium plus 0.20% $300 million 5.8% due March 2018 299 299 Make-whole premium plus 0.35% $600 million 5.75% due May 2018 654 — Make-whole premium plus 0.30% $100 million 6.6% due August 2018 111 — None $500 million 5.9% due June 2019 497 497 Make-whole premium plus 0.40% $1,300 million 2.3% due November 2020 1,293 1,294 Make-whole premium plus 0.15% $1,000 million 2.875% due November 2022 993 994 Make-whole premium plus 0.20% $475 million 2.7% due March 2023 471 471 Make-whole premium plus 0.10% $700 million 3.35% due May 2024 694 694 Make-whole premium plus 0.15% $800 million 3.15% due March 2025 794 794 Make-whole premium plus 0.15% $1,500 million 3.35% due May 2026 1,487 1,487 Make-whole premium plus 0.20% $100 million 8.875% due August 2029 100 100 None $200 million 6.8% due November 2031 260 — Make-whole premium plus 0.25% $300 million 6.7% due May 2036 297 297 Make-whole premium plus 0.20% $800 million 6.0% due May 2037 992 — Make-whole premium plus 0.20% $600 million 6.5% due May 2038 784 — Make-whole premium plus 0.30% $475 million 4.15% due March 2043 469 469 Make-whole premium plus 0.15% $1,500 million 4.35% due November 2045 1,482 1,482 Make-whole premium plus 0.25% Chubb INA $1,000 million 6.375% capital securities due March 2067 948 — Make-whole premium plus 0.25%-0.50% Other long-term debt (2.75% to 7.1% due December 2019 to September 2020) 11 11 None Total long-term debt $ 12,636 $ 9,389 Trust preferred securities Chubb INA capital securities due April 2030 $ 308 $ 307 Redemption price (1) (1) Redemption price is equal to accrued and unpaid interest to the redemption date plus the greater of (i) 100 percent of the principal amount thereof, or (ii) sum of present value of scheduled payments of principal and interest on the debentures from the redemption date to April 1, 2030.

Commitments, contingencies, a31

Commitments, contingencies, and guarantees (Tables)	3 Months Ended
Commitments, contingencies, and guarantees (Tables)	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Balance Sheet Locations, Fair Values In An Asset Or (Liability) Position, And Notional Values/Payment Provisions Of Derivative Instruments	March 31, 2016 December 31, 2015 Consolidated Balance Sheet Location Fair Value Notional Value/ Payment Provision Fair Value Notional Value/ Payment Provision (in millions of U.S. dollars) Derivative Asset Derivative (Liability) Derivative Asset Derivative (Liability) Investment and embedded derivative instruments Foreign currency forward contracts OA / (AP) $ 6 $ (19 ) $ 903 $ 7 $ (11 ) $ 1,029 Cross-currency swaps OA / (AP) — — 95 — — 95 Options/Futures contracts on notes and bonds OA / (AP) 5 (4 ) 1,235 5 (2 ) 751 Convertible securities (1) FM AFS / ES 3 — 7 31 — 40 $ 14 $ (23 ) $ 2,240 $ 43 $ (13 ) $ 1,915 Other derivative instruments Futures contracts on equities (2) OA / (AP) $ — $ (36 ) $ 1,171 $ — $ (4 ) $ 1,197 Other OA / (AP) — (10 ) 71 — (6 ) 15 $ — $ (46 ) $ 1,242 $ — $ (10 ) $ 1,212 GLB (3) (AP) / (FPB) $ — $ (1,122 ) $ 1,377 $ — $ (888 ) $ 1,155 (1) Includes fair value of embedded derivatives. (2) Related to GMDB and GLB blocks of business. (3) Includes both future policy benefits reserves and fair value derivative adjustment. Refer to Note 5 for additional information. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts.
Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations	Three Months Ended March 31 (in millions of U.S. dollars) 2016 2015 Investment and embedded derivative instruments Foreign currency forward contracts $ (10 ) $ 25 All other futures contracts and options (34 ) (29 ) Convertible securities (1) 5 5 Total investment and embedded derivative instruments $ (39 ) $ 1 GLB and other derivative instruments GLB (2) $ (228 ) $ (45 ) Futures contracts on equities (3) (15 ) (11 ) Options on equity market indices (3) — (1 ) Other (2 ) — Total GLB and other derivative instruments $ (245 ) $ (57 ) $ (284 ) $ (56 ) (1) Includes embedded derivatives. (2) Excludes foreign exchange gains (losses) related to GLB. (3) Related to GMDB and GLB blocks of business.
Transfer of Certain Financial Assets Accounted for as Secured Borrowings	Remaining contractual maturity March 31, 2016 Overnight and Continuous (in millions of U.S. dollars) Collateral held under securities lending agreements: Cash $ 434 U.S. Treasury and agency 89 Foreign 212 Corporate securities 2 Equity securities 266 $ 1,003 Gross amount of recognized liability for securities lending payable $ 1,004 Difference (1) $ (1 ) (1) The carrying value of the securities lending collateral held is $1 million lower than the securities lending payable due to accrued interest recorded in the securities lending payable.
Secured Borrowings Securities Lending Table Text Block [Table Text Block]	Remaining contractual maturity March 31, 2016 Greater than 90 Days (in millions of U.S. dollars) Collateral pledged under repurchase agreements: U.S. Treasury and agency $ 238 Mortgage-backed securities 1,235 $ 1,473 Gross amount of recognized liabilities for repurchase agreements $ 1,403 Difference (1) $ 70 (1) Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.

Shareholders' equity Shareholde

Shareholders' equity Shareholders' Equity (Tables)	3 Months Ended
Shareholders' equity Shareholders' Equity (Tables)	Mar. 31, 2016
Shareholders' equity [Abstract]
Dividends Declared [Table Text Block]	The following table presents dividend distributions per Common Share in Swiss francs (CHF) and U.S. dollars (USD): Three Months Ended March 31 2016 2015 CHF USD CHF USD Dividends – par value reduction — $ 0.62 $ 0.65 Dividends – distributed from capital contribution reserves 0.66 0.67 — — Total dividend distributions per common share 0.66 $ 0.67 0.62 $ 0.65
Share Repurchase Program [Table Text Block]	The following table presents repurchases of Chubb's Common Shares conducted in a series of open market transactions under the Board authorization: (in millions of U.S. dollars, except share data) Three Months Ended March 31 2016 2015 Number of shares repurchased — 3,027,463 Cost of shares repurchased $ — $ 340 Repurchase authorization remaining at end of period $ — $ 1,160

Postretirement benefits (Tables

Postretirement benefits (Tables)	3 Months Ended
Postretirement benefits (Tables)	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Schedule of Assumptions Used [Table Text Block]	The weighted average assumptions used to determine net pension and other postretirement benefit costs were as follows: Pension Benefits Other Postretirement Benefits U.S. Plans Non-U.S. Plans U.S. Plans Non-U.S. Plans As of March 31, 2016 Discount rate 4.28 % 3.74 % 4.41 % 4.30 % Rate of compensation increase 4.00 % 3.40 % N/A N/A Expected long-term rate of return on plan assets 7.00 % 4.90 % 7.00 % N/A As of December 31, 2015 Discount rate N/A 3.51 % N/A N/A Rate of compensation increase N/A 3.09 % N/A N/A Expected long-term rate of return on plan assets N/A 4.81 % N/A N/A
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]	Pension Benefits Other Postretirement Benefits U.S. Plans Non U.S. Plans Total U.S. Plans Non U.S. Plans Total (in millions of U.S. dollars) Fair value of plan assets $ 2,473 $ 315 $ 2,788 $ 138 $ — $ 138 Benefit obligation (3,153 ) (372 ) (3,525 ) (491 ) (15 ) (506 ) Funded status $ (680 ) $ (57 ) $ (737 ) $ (353 ) $ (15 ) $ (368 )
Schedule of Net Benefit Costs [Table Text Block]	The following table summarizes the components of net periodic benefit costs for our pension and postretirement benefit plans recognized in the consolidated statements of operations: Pension Benefits Other Postretirement Benefits (in millions of U.S. dollars) U.S. Plans Non-U.S. Plans Total U.S. Plans Non-U.S. Plans Total Three months ended March 31, 2016 Net periodic benefit cost: Service cost $ 17 $ 5 $ 22 $ 2 $ — $ 2 Interest cost 27 8 35 5 — 5 Expected return on plan assets (37 ) (10 ) (47 ) (2 ) — (2 ) Amortization of unrecognized: Net actuarial loss — 1 1 — — — Net periodic benefit cost $ 7 $ 4 $ 11 $ 5 $ — $ 5 Three months ended March 31, 2015 Net periodic benefit cost: Service cost $ — $ 2 $ 2 Interest cost — 5 5 Expected return on plan assets — (7 ) (7 ) Amortization of unrecognized: Net actuarial loss — 1 1 Net periodic benefit cost $ — $ 1 $ 1

Segment information (Tables)

Segment information (Tables)	3 Months Ended
Segment information (Tables)	Mar. 31, 2016
Segment Reporting [Abstract]
Operations By Segment	For the Three Months Ended North America Commercial P&C Insurance North America Personal P&C Insurance North America Agricultural Insurance Overseas General Insurance Global Reinsurance Life Insurance Corporate Chubb Consolidated March 31, 2016 (in millions of U.S. dollars) Net premiums written $ 2,302 $ 871 $ 64 $ 2,041 $ 201 $ 516 $ — $ 5,995 Net premiums earned 2,896 1,024 23 1,955 202 497 — 6,597 Losses and loss expenses 1,747 661 (30 ) 1,021 89 177 9 3,674 Policy benefits — — — — — 126 — 126 Policy acquisition costs 482 249 4 503 53 122 — 1,413 Administrative expenses 266 88 (4 ) 263 14 72 73 772 Underwriting income (loss) 401 26 53 168 46 — (82 ) 612 Net investment income (loss) 426 47 5 146 67 67 (84 ) 674 Segment income (loss) 827 73 58 314 113 67 (166 ) 1,286 Net realized gains (losses) including OTTI (394 ) (394 ) Interest expense 146 146 Other (income) expense: (Gains) losses from fair value changes in separate account assets 3 3 Other 25 25 Amortization of purchased intangibles 7 7 Chubb integration expenses 148 148 Income tax expense 124 124 Net income (loss) $ (1,013 ) $ 439 For the Three Months Ended North America Commercial P&C Insurance North America Personal P&C Insurance North America Agricultural Insurance Overseas General Insurance Global Reinsurance Life Insurance Corporate Chubb Consolidated March 31, 2015 (in millions of U.S. dollars) Net premiums written $ 1,297 $ 133 $ 88 $ 1,794 $ 273 $ 491 $ — $ 4,076 Net premiums earned 1,380 146 64 1,637 226 474 — 3,927 Losses and loss expenses 915 111 22 814 99 152 9 2,122 Policy benefits — — — — — 142 — 142 Policy acquisition costs 130 31 (4 ) 389 54 107 — 707 Administrative expenses 151 19 (1 ) 256 12 73 44 554 Underwriting income (loss) 184 (15 ) 47 178 61 — (53 ) 402 Net investment income 258 5 6 138 75 66 3 551 Segment income (loss) 442 (10 ) 53 316 136 66 (50 ) 953 Net realized gains (losses) including OTTI (89 ) (89 ) Interest expense 68 68 Other (income) expense: (Gains) losses from fair value changes in separate account assets (11 ) (11 ) Other (24 ) (24 ) Amortization of purchased intangibles 30 30 Income tax expense 120 120 Net income (loss) $ (322 ) $ 681

Earnings per share (Tables)

Earnings per share (Tables)	3 Months Ended
Earnings per share (Tables)	Mar. 31, 2016
Earnings Per Share [Abstract]
Schedule Of Earnings Per Share, Basic And Diluted	Three Months Ended March 31 (in millions of U.S. dollars, except share and per share data) 2016 2015 Numerator: Net income $ 439 $ 681 Denominator: Denominator for basic earnings per share: Weighted-average shares outstanding 446,739,586 328,212,376 Denominator for diluted earnings per share: Share-based compensation plans 3,270,156 3,480,344 Weighted-average shares outstanding and assumed conversions 450,009,742 331,692,720 Basic earnings per share $ 0.98 $ 2.08 Diluted earnings per share $ 0.97 $ 2.05 Potential anti-dilutive share conversions 2,074,308 715,148

Information provided in conne36

Information provided in connection with outstanding debt of subsidiaries (Tables)	3 Months Ended
	Mar. 31, 2016
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract]
Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet at March 31, 2016 (in millions of U.S. dollars) Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated Assets Investments $ 29 $ 643 $ 96,914 $ — $ 97,586 Cash (1) 2 3 2,406 (1,320 ) 1,091 Insurance and reinsurance balances receivable — — 10,884 (3,192 ) 7,692 Reinsurance recoverable on losses and loss expenses — — 22,065 (9,174 ) 12,891 Reinsurance recoverable on policy benefits — — 1,144 (959 ) 185 Value of business acquired — — 390 — 390 Goodwill and other intangible assets — — 23,359 — 23,359 Investments in subsidiaries 35,426 49,240 — (84,666 ) — Due from subsidiaries and affiliates, net 11,267 — — (11,267 ) — Other assets 4 503 17,291 (4,348 ) 13,450 Total assets $ 46,728 $ 50,389 $ 174,453 $ (114,926 ) $ 156,644 Liabilities Unpaid losses and loss expenses $ — $ — $ 68,917 $ (8,711 ) $ 60,206 Unearned premiums — — 18,522 (3,626 ) 14,896 Future policy benefits — — 5,828 (959 ) 4,869 Due to subsidiaries and affiliates, net — 11,199 68 (11,267 ) — Affiliated notional cash pooling programs (1) 521 799 — (1,320 ) — Repurchase agreements — — 1,403 — 1,403 Short-term debt — 500 — — 500 Long-term debt — 12,625 11 — 12,636 Trust preferred securities — 308 — — 308 Other liabilities 310 1,575 18,421 (4,377 ) 15,929 Total liabilities 831 27,006 113,170 (30,260 ) 110,747 Total shareholders’ equity 45,897 23,383 61,283 (84,666 ) 45,897 Total liabilities and shareholders’ equity $ 46,728 $ 50,389 $ 174,453 $ (114,926 ) $ 156,644 (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 , the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Balance Sheet at December 31, 2015 (in millions of U.S. dollars) Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated Assets Investments $ 28 $ 7,839 $ 58,384 $ — $ 66,251 Cash (1) 1 2 2,743 (971 ) 1,775 Insurance and reinsurance balances receivable — — 6,075 (752 ) 5,323 Reinsurance recoverable on losses and loss expenses — — 20,124 (8,738 ) 11,386 Reinsurance recoverable on policy benefits — — 1,129 (942 ) 187 Value of business acquired — — 395 — 395 Goodwill and other intangible assets — — 5,683 — 5,683 Investments in subsidiaries 29,612 18,386 — (47,998 ) — Due from subsidiaries and affiliates, net 644 1,800 — (2,444 ) — Other assets 8 457 14,434 (3,593 ) 11,306 Total assets $ 30,293 $ 28,484 $ 108,967 $ (65,438 ) $ 102,306 Liabilities Unpaid losses and loss expenses $ — $ — $ 45,490 $ (8,187 ) $ 37,303 Unearned premiums — — 10,243 (1,804 ) 8,439 Future policy benefits — — 5,749 (942 ) 4,807 Due to subsidiaries and affiliates, net — — 2,444 (2,444 ) — Affiliated notional cash pooling programs (1) 882 89 — (971 ) — Repurchase agreements — — 1,404 — 1,404 Long-term debt — 9,378 11 — 9,389 Trust preferred securities — 307 — — 307 Other liabilities 276 1,422 12,916 (3,092 ) 11,522 Total liabilities 1,158 11,196 78,257 (17,440 ) 73,171 Total shareholders’ equity 29,135 17,288 30,710 (47,998 ) 29,135 Total liabilities and shareholders’ equity $ 30,293 $ 28,484 $ 108,967 $ (65,438 ) $ 102,306 (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2015 , the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
Condensed Consolidating Statement Of Operations and Comprehensive Income	Condensed Consolidating Statements of Operations and Comprehensive Income For the Three Months Ended March 31, 2016 Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 5,995 $ — $ 5,995 Net premiums earned — — 6,597 — 6,597 Net investment income 1 4 669 — 674 Equity in earnings of subsidiaries 375 506 — (881 ) — Net realized gains (losses) including OTTI — — (394 ) — (394 ) Losses and loss expenses — — 3,674 — 3,674 Policy benefits — — 126 — 126 Policy acquisition costs and administrative expenses 17 36 2,132 — 2,185 Interest (income) expense (80 ) 215 11 — 146 Other (income) expense (9 ) 10 27 — 28 Amortization of purchased intangibles — — 7 — 7 Chubb integration expenses 3 137 8 — 148 Income tax expense (benefit) 6 (150 ) 268 — 124 Net income $ 439 $ 262 $ 619 $ (881 ) $ 439 Comprehensive income (loss) $ 1,541 $ 1,056 $ 1,721 $ (2,777 ) $ 1,541 Condensed Consolidating Statements of Operations and Comprehensive Income For the Three Months Ended March 31, 2015 Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 4,076 $ — $ 4,076 Net premiums earned — — 3,927 — 3,927 Net investment income 1 1 549 — 551 Equity in earnings of subsidiaries 648 204 — (852 ) — Net realized gains (losses) including OTTI — — (89 ) — (89 ) Losses and loss expenses — — 2,122 — 2,122 Policy benefits — — 142 — 142 Policy acquisition costs and administrative expenses 14 6 1,241 — 1,261 Interest (income) expense (8 ) 69 7 — 68 Other (income) expense (41 ) (3 ) 9 — (35 ) Amortization of purchased intangibles — — 30 — 30 Income tax expense (benefit) 3 (26 ) 143 — 120 Net income $ 681 $ 159 $ 693 $ (852 ) $ 681 Comprehensive income $ 642 $ 24 $ 654 $ (678 ) $ 642
Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows For the Three Months Ended March 31, 2016 Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Consolidating Adjustments and Eliminations Chubb Limited Consolidated (in millions of U.S. dollars) Net cash flows from operating activities $ 3,272 $ 3,109 $ 1,011 $ (6,372 ) $ 1,020 Cash flows from investing activities Purchases of fixed maturities available for sale — — (8,104 ) — (8,104 ) Purchases of fixed maturities held to maturity — — (77 ) — (77 ) Purchases of equity securities — — (33 ) — (33 ) Sales of fixed maturities available for sale — — 6,329 — 6,329 Sales of equity securities — — 761 — 761 Maturities and redemptions of fixed maturities available for sale — — 1,553 — 1,553 Maturities and redemptions of fixed maturities held to maturity — — 249 — 249 Net change in short-term investments — 7,788 4,144 — 11,932 Net derivative instruments settlements — — (22 ) — (22 ) Acquisition of subsidiaries (net of cash acquired of $57) — (14,282 ) 20 — (14,262 ) Capital contribution (2,330 ) — (2,330 ) 4,660 — Other — — 59 — 59 Net cash flows (used for) from investing activities (2,330 ) (6,494 ) 2,549 4,660 (1,615 ) Cash flows from financing activities Dividends paid on Common Shares (218 ) — — — (218 ) Proceeds from issuance of repurchase agreements — — 853 — 853 Repayment of repurchase agreements — — (853 ) — (853 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 51 — 51 Dividend to parent company — — (6,372 ) 6,372 — Advances (to) from affiliates (362 ) 350 12 — — Capital contribution — 2,330 2,330 (4,660 ) — Net proceeds from (payments to) affiliated notional cash pooling programs (1) (361 ) 710 — (349 ) — Policyholder contract deposits — — 118 — 118 Policyholder contract withdrawals — — (49 ) — (49 ) Other — (4 ) — — (4 ) Net cash flows (used for) from financing activities (941 ) 3,386 (3,910 ) 1,363 (102 ) Effect of foreign currency rate changes on cash and cash equivalents — — 13 — 13 Net increase (decrease) in cash 1 1 (337 ) (349 ) (684 ) Cash – beginning of period (1) 1 2 2,743 (971 ) 1,775 Cash – end of period (1) $ 2 $ 3 $ 2,406 $ (1,320 ) $ 1,091 (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 and December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Statement of Cash Flows For the Three Months Ended March 31, 2015 Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated (in millions of U.S. dollars) Net cash flows from operating activities $ 48 $ 4 $ 1,023 $ — $ 1,075 Cash flows from investing activities Purchases of fixed maturities available for sale — — (4,336 ) — (4,336 ) Purchases of fixed maturities held to maturity — — (21 ) — (21 ) Purchases of equity securities — — (39 ) — (39 ) Sales of fixed maturities available for sale — — 2,002 — 2,002 Sales of equity securities — — 28 — 28 Maturities and redemptions of fixed maturities available for sale — — 1,481 — 1,481 Maturities and redemptions of fixed maturities held to maturity — — 324 — 324 Net change in short-term investments — 216 (471 ) — (255 ) Net derivative instruments settlements — — (51 ) — (51 ) Other — — (153 ) — (153 ) Net cash flows from (used for) investing activities — 216 (1,236 ) — (1,020 ) Cash flows from financing activities Dividends paid on Common Shares (214 ) — — — (214 ) Common Shares repurchased — — (347 ) — (347 ) Proceeds from issuance of long-term debt — 800 — — 800 Proceeds from issuance of short-term debt — — 477 — 477 Repayment of short-term debt — — (477 ) — (477 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 39 — 39 Advances (to) from affiliates 336 (340 ) 4 — — Net proceeds from (payments to) affiliated notional cash pooling programs (1) (168 ) (309 ) — 477 — Policyholder contract deposits 101 101 Policyholder contract withdrawals — — (40 ) — (40 ) Other — (6 ) — — (6 ) Net cash flows (used for) from financing activities (46 ) 145 (243 ) 477 333 Effect of foreign currency rate changes on cash and cash equivalents — — (95 ) — (95 ) Net increase (decrease) in cash 2 365 (551 ) 477 293 Cash – beginning of period (1) — 1 1,209 (555 ) 655 Cash – end of period (1) $ 2 $ 366 $ 658 $ (78 ) $ 948 (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

General Adoption of New Account

General Adoption of New Accounting Pronouncements (Details) $ in Millions	Dec. 31, 2015USD ($)
Components of Deferred Debt Issuance Costs [Line Items]
Debt Issuance Costs	$ 60
Long-term Debt [Member]
Components of Deferred Debt Issuance Costs [Line Items]
Debt Issuance Costs	58
Trust Preferred Securities [Member]
Components of Deferred Debt Issuance Costs [Line Items]
Debt Issuance Costs	$ 2

Acquisitions (Detail)

Acquisitions (Detail) $ / shares in Units, $ in Millions	Jan. 14, 2016USD ($)$ / sharesshares	Mar. 31, 2016USD ($)shares		Mar. 31, 2015USD ($)shares		Dec. 31, 2015USD ($)		Nov. 01, 2015USD ($)	Apr. 01, 2015USD ($)	Dec. 31, 2014USD ($)	[3]
Business Acquisition [Line Items]
Other intangible assets		$ 7,955				$ 887
Chubb integration expenses		$ 148		$ 0
Weighted-average shares outstanding \| shares		446,739,586		328,212,376
Goodwill		$ 15,404				4,796
Unpaid losses and loss expenses		60,206				37,303
Unearned premiums		14,896				8,439
Insurance and reinsurance balances receivable		7,692				5,323
Cash		1,091	[1],[2]	$ 948	[3]	1,775	[1],[4]			$ 655
Common Shares (CHF 24.15 par value; 479,783,864 and 342,832,412 shares issued; 464,283,520 and 324,563,441 shares outstanding)		11,121				7,833
Investments		97,586				66,251
Accrued investment income		891				513
Reinsurance recoverable on losses and loss expenses		12,891				11,386
Prepaid reinsurance premiums		2,376				2,082
Other assets		5,150				3,821
Insurance and reinsurance balances payable		4,733				4,270
Accounts payable, accrued expenses, and other liabilities		9,050				6,205
Deferred Tax Liabilities, Net		(1,142)				0
Long-term debt		$ (12,636)				$ (9,389)
The Chubb Corporation [Member]
Business Acquisition [Line Items]
Weighted-average shares outstanding \| shares	228,000,000
Business Acquisition, Expected Financing Of Acquisition With Cash	$ 9,000
Goodwill	10,445
Total Consideration	29,846
Unpaid losses and loss expenses	(22,878)
Unearned premiums	(7,016)
Insurance and reinsurance balances receivable	2,948
Cash	57
Expected purchase price	$ 29,500
Approximate number of shares to be issued \| shares	323,000,000
Senior notes issued to finance acquisition								$ 5,300
Payments to Acquire Businesses, Gross	$ 14,319
Investments	42,869
Accrued investment income	337
Reinsurance recoverable on losses and loss expenses	1,657
Indefinite-Lived Intangible Assets	2,860
Finite-Lived Intangible Assets	4,795
Prepaid reinsurance premiums	280
Other assets	989
Insurance and reinsurance balances payable	(468)
Accounts payable, accrued expenses, and other liabilities	(1,919)
Deferred Tax Liabilities, Net	(1,350)
Long-term debt	(3,760)
Attributed Value Equity Awards Assumed in Acquisition	323
Total Value of Equity Awards Issued in Acquisition	$ 525
Cash consideration per share \| $ / shares	$ 62.93
Fair value of common shares issued by Chubb Limited to common shareholders of Chubb Corp	$ 15,204
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares \| shares	137,000,000
Share Price \| $ / shares	$ 111.02
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 19,401
Shares Conversion Ratio in Acquisition	0.6019
Fireman's Fund high net worth personal lines [Member]
Business Acquisition [Line Items]
Other intangible assets									$ 278
Goodwill									196
Purchase price									365
Assumed liabilities fair value									863
Unpaid losses and loss expenses									417
Unearned premiums									428
Insurance and reinsurance balances receivable									124
Cash									629
Acquired assets fair value									$ 753

[1]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 and December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3]	maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[4]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Supplemental FInancial Informat

Supplemental FInancial Information for Acquisition (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2016	Mar. 31, 2015
Business Acquisition [Line Items]
Actual Revenue of Chubb Corp since Acquisition Date		$ 2,487
Actual Net Income of Chubb Corp since Acquisition Date		$ 255
Pro Forma Total Revenues	$ 7,322		$ 7,695
Pro Forma Net Income	$ 534		$ 959
Pro Forma Earnings Per Share, Basic	$ 1.14		$ 2.05
Pro Forma Earnings Per Share, Diluted	$ 1.14		$ 2.03

Investments (Narrative) (Detail

Investments (Narrative) (Detail) $ in Millions	3 Months Ended
Investments (Narrative) (Detail) $ in Millions	Mar. 31, 2016USD ($)Security	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)
Investment [Line Items]
Document Period End Date	Mar. 31, 2016
Total number of fixed maturities \| Security	30,019
Number of equity securities in an unrealized loss position \| Security	94
Total number of equity securities \| Security	304
Largest single unrealized loss in the equity securities	$ 2
Restricted assets in fixed maturities and short-term investments	18,200		$ 16,900
Restricted assets in cash	$ 119		110
Moodys Historical Mean Recovery Rate	42.00%
Company Assumed Recovery Rate	32.00%
Net unrealized depreciation included in AOCI	$ 24		35
Investments in partially-owned insurance companies	654		$ 653
Net unrealized appreciation (depreciation) included in OCI	$ 23	$ 4
Number of fixed maturities in an unrealized loss position \| Security	5,636
Credit losses recognized in net income for mortgage-backed securities	$ 0	0
Credit losses recognized in net income for corporate securities	$ 17	$ 4
Percentage of mortgage-backed securities represented by investments in US government agency bonds	77.00%		81.00%
Reinsurance recoverable on losses and loss expenses	$ 12,891		$ 11,386
Insurance and reinsurance balances payable	4,733		4,270
Unearned premiums	14,896		$ 8,439
Largest single unrealized loss in the fixed maturities	$ 4

Investments (Schedule Of Amorti

Investments (Schedule Of Amortized Cost And Fair Value Of Fixed Maturities And Related Other-Than-Temporary Impairment Recognized In Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Document Period End Date	Mar. 31, 2016
Held to maturity, Amortized Cost	$ 11,280	$ 8,430
Held to maturity, Gross Unrealized Appreciation	323	190
Held to maturity, Gross Unrealized Depreciation	(23)	(68)
Held to maturity, Fair Value	11,580	8,552
Available for sale, Amortized Cost	75,991	43,149
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	1,899	1,168
Available for sale, Gross Unrealized Depreciation	(352)	(730)
Available for sale, Fair Value	77,538	43,587
Available for sale, OTTI recognized in AOCI	(38)	(42)
U.S. Treasury And Agency [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	700	733
Held to maturity, Gross Unrealized Appreciation	23	13
Held to maturity, Gross Unrealized Depreciation	0	(1)
Held to maturity, Fair Value	723	745
Held to maturity, OTTI recognized in AOCI	0	0
Available for sale, Amortized Cost	2,984	2,481
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	85	52
Available for sale, Gross Unrealized Depreciation	0	(5)
Available for sale, Fair Value	3,069	2,528
Available for sale, OTTI recognized in AOCI	0	0
Foreign [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	749	763
Held to maturity, Gross Unrealized Appreciation	38	30
Held to maturity, Gross Unrealized Depreciation	(4)	(8)
Held to maturity, Fair Value	783	785
Held to maturity, OTTI recognized in AOCI	0	0
Available for sale, Amortized Cost	20,026	13,190
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	685	468
Available for sale, Gross Unrealized Depreciation	(118)	(213)
Available for sale, Fair Value	20,593	13,445
Available for sale, OTTI recognized in AOCI	(16)	(13)
Corporate [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	2,951	3,054
Held to maturity, Gross Unrealized Appreciation	98	57
Held to maturity, Gross Unrealized Depreciation	(16)	(55)
Held to maturity, Fair Value	3,033	3,056
Held to maturity, OTTI recognized in AOCI	0	0
Available for sale, Amortized Cost	21,783	15,028
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	640	355
Available for sale, Gross Unrealized Depreciation	(212)	(454)
Available for sale, Fair Value	22,211	14,929
Available for sale, OTTI recognized in AOCI	(21)	(28)
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	1,652	1,707
Held to maturity, Gross Unrealized Appreciation	65	38
Held to maturity, Gross Unrealized Depreciation	(1)	(2)
Held to maturity, Fair Value	1,716	1,743
Held to maturity, OTTI recognized in AOCI	0	0
Available for sale, Amortized Cost	11,766	9,827
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	289	183
Available for sale, Gross Unrealized Depreciation	(10)	(52)
Available for sale, Fair Value	12,045	9,958
Available for sale, OTTI recognized in AOCI	(1)	(1)
States, Municipalities, And Political Subdivisions [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	5,228	2,173
Held to maturity, Gross Unrealized Appreciation	99	52
Held to maturity, Gross Unrealized Depreciation	(2)	(2)
Held to maturity, Fair Value	5,325	2,223
Held to maturity, OTTI recognized in AOCI	0	0
Available for sale, Amortized Cost	19,432	2,623
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	200	110
Available for sale, Gross Unrealized Depreciation	(12)	(6)
Available for sale, Fair Value	19,620	2,727
Available for sale, OTTI recognized in AOCI	$ 0	$ 0

Investments (Schedule Of Fixed

Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 3,712	$ 1,856
Available for sale, Due after 1 year through 5 years, Amortized Cost	25,064	14,936
Available for sale, Due after 5 years though 10 years, Amortized Cost	25,453	12,258
Available for sale, Due after 10 years, Amortized Cost	9,996	4,272
Available for sale, Subtotal, Amortized Cost	64,225	33,322
Available for sale, Mortgage-backed securities, Amortized Cost	11,766	9,827
Available for sale, Amortized Cost	75,991	43,149
Available for sale, Fair Value	77,538	43,587
Held to maturity, Due in 1 year or less, Amortized Cost	425	492
Held to maturity, Due after 1 year through 5 years, Amortized Cost	2,505	2,443
Held to maturity, Due after 5 years through 10 years, Amortized Cost	2,918	2,292
Held to maturity, Due after 10 years, Amortized Cost	3,780	1,496
Held to maturity, Subtotal, Amortized Cost	9,628	6,723
Held to maturity, Mortgage backed securities, Amortized Cost	1,652	1,707
Available for sale, Due in 1 year or less, Fair Value	3,724	1,865
Available for sale, Due after 1 year through 5 years, Fair Value	25,492	15,104
Available for sale, Due after 5 years through 10 years, Fair Value	25,887	12,173
Available for sale, Due after 10 years, Fair Value	10,390	4,487
Available for sale, Subtotal, Fair Value	65,493	33,629
Available for sale, Mortgage backed securities, Fair Value	12,045	9,958
Held to maturity, Due in 1 year or less, Fair Value	429	495
Held to maturity, Due after 1 year through 5, Fair Value	2,597	2,517
Held to maturity, Due after 5 years through 10 years, Fair Value	2,991	2,313
Held to maturity, Due after 10 years, Fair Value	3,847	1,484
Held to maturity, Subtotal, Fair Value	9,864	6,809
Held to maturity, Mortgage backed securities, Fair Value	1,716	1,743
Held to maturity, Amortized Cost	11,280	8,430
Held to maturity, Fair Value	$ 11,580	$ 8,552

Investments (Schedule Of Cost A

Investments (Schedule Of Cost And Fair Value Of Equity Securities) (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Cost	$ 841	$ 441
Gross unrealized appreciation	84	74
Gross unrealized depreciation	(32)	(18)
Fair value	$ 893	$ 497

Investments (Net Realized Gains

Investments (Net Realized Gains (Losses) And Losses Included In Net Realized Gains (Losses) And Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
OTTI on fixed maturities, gross	$ (67)	$ (13)
OTTI on fixed maturities recognized in OCI (pre-tax)	8	0
OTTI on fixed maturities, net	(59)	(13)
Fixed maturities, Gross realized gains excluding OTTI	65	44
Fixed maturities, Gross realized losses excluding OTTI	(196)	(35)
Total fixed maturities	(190)	(4)
OTTI on equity securities	(1)	0
Equity securities, Gross realized gains excluding OTTI	40	3
Equity securities, Gross realized losses excluding OTTI	(1)	(2)
Total equity securities	38	1
OTTI on other investments	(3)	0
Foreign exchange gains (losses)	39	(31)
Investment and embedded derivative instruments	(39)	1
Fair value adjustments on insurance derivative	(228)	(45)
S&P put options and futures	(15)	(12)
Other derivative instruments	(2)	0
Other	6	1
Total net realized gains (losses) (includes $(152) and $(3) reclassified from AOCI)	$ (394)	$ (89)

Investments (Roll-Forward Of Pr

Investments (Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which Portion Of Other-Than-Temporary Impairment Was Recognized In Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which Portion Of Other-Than-Temporary Impairment Was Recognized In Other Comprehensive Income [Roll Forward]
Balance of credit losses related to securities still held – beginning of period	$ 53	$ 28
Additions where no OTTI was previously recorded	11	3
Additions where an OTTI was previously recorded	6	1
Reductions for securities sold during the period	(13)	(10)
Balance of credit losses related to securities still held – end of period	$ 57	$ 22

Investments (Aggregate Fair Val

Investments (Aggregate Fair Value And Gross Unrealized Loss By Length Of Time Security Has Continuously Been In Unrealized Loss Position) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Document Period End Date	Mar. 31, 2016
Fair Value, 0-12 Months	$ 12,795	$ 16,763
Gross Unrealized Loss, 0-12 Months	(287)	(601)
Fair Value, Over 12 Months	2,064	1,885
Gross Unrealized Loss, Over 12 Months	(138)	(226)
Total Fair Value	14,859	18,648
Total Gross Unrealized Loss	(425)	(827)
U.S. Treasury And Agency [Member]
Investment [Line Items]
Fair Value, 0-12 Months		996
Gross Unrealized Loss, 0-12 Months		(5)
Fair Value, Over 12 Months		153
Gross Unrealized Loss, Over 12 Months		(1)
Total Fair Value		1,149
Total Gross Unrealized Loss		(6)
Foreign [Member]
Investment [Line Items]
Fair Value, 0-12 Months	3,204	3,953
Gross Unrealized Loss, 0-12 Months	(69)	(148)
Fair Value, Over 12 Months	486	436
Gross Unrealized Loss, Over 12 Months	(53)	(73)
Total Fair Value	3,690	4,389
Total Gross Unrealized Loss	(122)	(221)
Corporate [Member]
Investment [Line Items]
Fair Value, 0-12 Months	4,014	7,518
Gross Unrealized Loss, 0-12 Months	(152)	(371)
Fair Value, Over 12 Months	651	738
Gross Unrealized Loss, Over 12 Months	(76)	(138)
Total Fair Value	4,665	8,256
Total Gross Unrealized Loss	(228)	(509)
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Fair Value, 0-12 Months	1,190	3,399
Gross Unrealized Loss, 0-12 Months	(4)	(42)
Fair Value, Over 12 Months	854	516
Gross Unrealized Loss, Over 12 Months	(7)	(12)
Total Fair Value	2,044	3,915
Total Gross Unrealized Loss	(11)	(54)
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Fair Value, 0-12 Months	3,848	556
Gross Unrealized Loss, 0-12 Months	(12)	(6)
Fair Value, Over 12 Months	73	42
Gross Unrealized Loss, Over 12 Months	(2)	(2)
Total Fair Value	3,921	598
Total Gross Unrealized Loss	(14)	(8)
Fixed Maturities [Member]
Investment [Line Items]
Fair Value, 0-12 Months	12,256	16,422
Gross Unrealized Loss, 0-12 Months	(237)	(572)
Fair Value, Over 12 Months	2,064	1,885
Gross Unrealized Loss, Over 12 Months	(138)	(226)
Total Fair Value	14,320	18,307
Total Gross Unrealized Loss	(375)	(798)
Equity Securities [Member]
Investment [Line Items]
Fair Value, 0-12 Months	310	131
Gross Unrealized Loss, 0-12 Months	(32)	(18)
Fair Value, Over 12 Months	0	0
Gross Unrealized Loss, Over 12 Months	0	0
Total Fair Value	310	131
Total Gross Unrealized Loss	(32)	(18)
Other Long-term Investments [Member]
Investment [Line Items]
Fair Value, 0-12 Months	229	210
Gross Unrealized Loss, 0-12 Months	(18)	(11)
Fair Value, Over 12 Months	0	0
Gross Unrealized Loss, Over 12 Months	0	0
Total Fair Value	229	210
Total Gross Unrealized Loss	$ (18)	$ (11)

Investments (Schedule Of Compon

Investments (Schedule Of Components Of Restricted Assets) (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Trust funds	$ 11,681	$ 11,862
Deposits with non-U.S. regulatory authorities	2,260	2,075
Assets pledged under repurchase agreements	1,473	1,459
Deposits with U.S. regulatory authorities	2,523	1,242
Other pledged assets	400	392
Total restricted assets	$ 18,337	$ 17,030

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value Measurements Of Financial Instruments [Line Items]
Total Liabilities Not Carried At Fair Value Not Carried At Fair Value		$ 11,100
Fair Value	$ 3,658	2,477
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Fair Value	$ 3,658	2,477
Minimum [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Notice Period For Redemption For Alternative Investments Investment Funds	5 days
Maximum [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Notice Period For Redemption For Alternative Investments Investment Funds	120 days
Financial Instruments Fair Value [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Total Liabilities Not Carried At Fair Value Not Carried At Fair Value	$ 15,672	$ 11,528

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair Value	$ 3,658	$ 2,477
Available for sale, Fair Value	77,538	43,587
Equity securities, at fair value	893	497
Short-term investments	3,382	10,446
Other investments (cost – $4,233 and $2,993)	4,493	3,291
Securities lending collateral	1,003	1,046
Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	2,444	1,712
Equity securities, at fair value	864	481
Short-term investments	1,405	7,171
Other investments (cost – $4,233 and $2,993)	362	347
Investment derivative instruments, assets	11	12
Separate account assets	1,499	1,464
Total assets measured at fair value	6,585	11,187
Investment derivative instruments, liabilities	23	13
Other derivative instruments, liability	36	4
Total liabilities measured at fair value	59	17
Fair Value, Inputs, Level 1 [Member] \| U.S. Treasury And Agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	2,444	1,712
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	74,723	41,591
Short-term investments	1,977	3,275
Other investments (cost – $4,233 and $2,993)	237	230
Securities lending collateral	1,003	1,046
Separate account assets	90	88
Total assets measured at fair value	78,030	46,230
Fair Value, Inputs, Level 2 [Member] \| U.S. Treasury And Agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	625	816
Fair Value, Inputs, Level 2 [Member] \| Foreign [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	20,531	13,388
Fair Value, Inputs, Level 2 [Member] \| Corporate [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	21,950	14,755
Fair Value, Inputs, Level 2 [Member] \| Collateralized Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	11,997	9,905
Fair Value, Inputs, Level 2 [Member] \| States, Municipalities, And Political Subdivisions [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	19,620	2,727
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	371	284
Equity securities, at fair value	29	16
Other investments (cost – $4,233 and $2,993)	211	212
Total assets measured at fair value	611	512
Other derivative instruments, liability	10	6
GLB	839	609
Total liabilities measured at fair value	849	615
Fair Value, Inputs, Level 3 [Member] \| Foreign [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	62	57
Fair Value, Inputs, Level 3 [Member] \| Corporate [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	261	174
Fair Value, Inputs, Level 3 [Member] \| Collateralized Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	48	53
Fair Value [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	77,538	43,587
Equity securities, at fair value	893	497
Short-term investments	3,382	10,446
Other investments (cost – $4,233 and $2,993)	810	789
Securities lending collateral	1,003	1,046
Investment derivative instruments, assets	11	12
Separate account assets	1,589	1,552
Total assets measured at fair value	85,226	57,929
Investment derivative instruments, liabilities	23	13
Other derivative instruments, liability	46	10
GLB	839	609
Total liabilities measured at fair value	908	632
Fair Value [Member] \| U.S. Treasury And Agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	3,069	2,528
Fair Value [Member] \| Foreign [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	20,593	13,445
Fair Value [Member] \| Corporate [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	22,211	14,929
Fair Value [Member] \| Collateralized Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	12,045	9,958
Fair Value [Member] \| States, Municipalities, And Political Subdivisions [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	$ 19,620	$ 2,727

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value And Maximum Future Funding Commitments Related To Investments) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Maximum future funding commitments	$ 2,112	$ 824
Fair Value	3,658	2,477
Financial [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Maximum future funding commitments	210	105
Fair Value	580	300
Real Assets [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Maximum future funding commitments	321	140
Fair Value	577	474
Distressed [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Maximum future funding commitments	217	218
Fair Value	451	261
Private Credit [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Maximum future funding commitments	349	209
Fair Value	272	265
Traditional [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Maximum future funding commitments	1,001	152
Fair Value	1,498	895
Vintage [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Maximum future funding commitments	14
Fair Value	36	13
Investment Funds [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Fair Value	$ 244	$ 269
Minimum [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Notice Period For Redemption For Alternative Investments Investment Funds	5 days
Minimum [Member] \| Financial [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Expected liquidation period of underlying assets	5 years	5 years
Minimum [Member] \| Real Assets [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Expected liquidation period of underlying assets	3 years	3 years
Minimum [Member] \| Distressed [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Expected liquidation period of underlying assets	5 years	5 years
Minimum [Member] \| Private Credit [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Expected liquidation period of underlying assets	3 years	3 years
Minimum [Member] \| Traditional [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Expected liquidation period of underlying assets	3 years	3 years
Minimum [Member] \| Vintage [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Expected liquidation period of underlying assets	1 year	1 year
Maximum [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Notice Period For Redemption For Alternative Investments Investment Funds	120 days
Maximum [Member] \| Financial [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Expected liquidation period of underlying assets	9 years	9 years
Maximum [Member] \| Real Assets [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Expected liquidation period of underlying assets	7 years	7 years
Maximum [Member] \| Distressed [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Expected liquidation period of underlying assets	9 years	9 years
Maximum [Member] \| Private Credit [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Expected liquidation period of underlying assets	7 years	7 years
Maximum [Member] \| Traditional [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Expected liquidation period of underlying assets	9 years	9 years
Maximum [Member] \| Vintage [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Expected liquidation period of underlying assets	2 years	2 years

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Document Period End Date		Mar. 31, 2016
Valuation Technique	[1]	Actuarial model
Minimum [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Inputs Lapse rate	[1]	1.00%
Significant Unobservable Inputs Annuitization rate	[1]	0.00%
Maximum [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Inputs Lapse rate	[1]	30.00%
Significant Unobservable Inputs Annuitization rate	[1]	55.00%
Guaranteed Living Benefit [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	[1]		$ 609

[1]	Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 4 a) Guaranteed living benefits.

Fair Value Measurements (Fina52

Fair Value Measurements (Financial Instruments Measured At Fair Value Using Significant Unobservable Inputs) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015		Dec. 31, 2015	Dec. 31, 2014
Schedule Of Fair Value Measurements [Line Items]
Document Period End Date	Mar. 31, 2016
Equity Securities [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	$ 0		$ 0
Balance- Beginning of Period, Assets	16		2
Transfers out of Level 3, Assets	0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	0		0
Purchases, Assets	13		0
Sales, Assets	0		0
Settlements, Assets	0		0
Balance-End of Period, Assets	29		2
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	0		0
Equity Securities [Member] \| Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Net Realized Gains/Losses, Assets	0		0
Other Long-term Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0		0
Balance- Beginning of Period, Assets	212		204
Transfers out of Level 3, Assets	0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	0		(2)
Purchases, Assets	6		9
Sales, Assets	0		0
Settlements, Assets	(7)		(3)
Balance-End of Period, Assets	211		208
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	0		0
Other Long-term Investments [Member] \| Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Net Realized Gains/Losses, Assets	0		0
Other Derivative Instruments Fair Value [Member]
Schedule Of Fair Value Measurements [Line Items]
Balance - Beginning of Period, Liabilities	6		4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3			0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	0		0
Purchases, Assets			0
Sales, Assets			0
Settlements, Assets	0		0
Balance-End of Period, Assets	10		4
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities	2		0
Other Derivative Instruments Fair Value [Member] \| Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Net Realized Gains/Losses, Liabilities	2		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	2
Available-for-sale Securities [Member] \| Foreign [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	6		0
Balance- Beginning of Period, Assets	57		22
Transfers out of Level 3, Assets	(2)
Change in Net Unrealized Gains (Losses) included in OCI, Assets	6		0
Purchases, Assets	5		1
Sales, Assets	(1)		(1)
Settlements, Assets	(4)		0
Balance-End of Period, Assets	62		22
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	(4)		0
Available-for-sale Securities [Member] \| Foreign [Member] \| Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Net Realized Gains/Losses, Assets	(5)		0
Available-for-sale Securities [Member] \| Corporate [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	16		1
Balance- Beginning of Period, Assets	174		187
Transfers out of Level 3, Assets	0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	2		3
Purchases, Assets	93		8
Sales, Assets	(14)		(3)
Settlements, Assets	(4)		(26)
Balance-End of Period, Assets	261		167
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	(7)		(2)
Available-for-sale Securities [Member] \| Corporate [Member] \| Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Net Realized Gains/Losses, Assets	(6)		(3)
Available-for-sale Securities [Member] \| Collateralized Mortgage Backed Securities [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0		0
Balance- Beginning of Period, Assets	53		15
Transfers out of Level 3, Assets	0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	0		0
Purchases, Assets	0		18
Sales, Assets	(5)		0
Settlements, Assets	0		0
Balance-End of Period, Assets	48		33
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	0		0
Available-for-sale Securities [Member] \| Collateralized Mortgage Backed Securities [Member] \| Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Net Realized Gains/Losses, Assets	0		0
Guaranteed Living Benefit [Member]
Schedule Of Fair Value Measurements [Line Items]
Balance - Beginning of Period, Liabilities	609	[1]	406	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0
Transfers out of Level 3, Assets	0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	0
Purchases, Assets	0
Sales, Assets	0
Settlements, Assets	0
Balance - End of Period, Liabilities	839	[1]	451	[2]
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities	230		45	[2]
Reported liabilities	1,100		716		$ 888	$ 663
Guaranteed Living Benefit [Member] \| Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Net Realized Gains/Losses, Liabilities	$ 230		$ 45

[1]	Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information.
[2]	Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. The liability for GLB reinsurance was $716 million at March 31, 2015, and $663 million at December 31, 2014, which includes a fair value derivative adjustment of $451 million and $406 million, respectively.

Fair Value Measurements (Carryi

Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Document Period End Date	Mar. 31, 2016
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	$ 11,280	$ 8,430
Unearned Premium Reserves Amortization, Next Three Months	11,580	8,552
Investments in partially-owned insurance companies	654	653
Repurchase Agreements	1,403	1,404
Short-term debt	500	0
Long-term debt	12,636	9,389
Trust preferred securities	308	307
Trust Preferred Securities Not Carried At Fair Value		307
Total liabilities	110,747	73,171
Total Liabilities Not Carried At Fair Value Not Carried At Fair Value		11,100
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unearned Premium Reserves Amortization, Next Three Months	598	583
Short-term debt	0
Long-term debt	0	0
Trust preferred securities	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unearned Premium Reserves Amortization, Next Three Months	10,969	7,955
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unearned Premium Reserves Amortization, Next Three Months	13	14
Short-term debt	0
Long-term debt	0	0
Trust preferred securities	0	0
Total liabilities	0	0
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unearned Premium Reserves Amortization, Next Three Months	11,280	8,430
Repurchase Agreements	1,403
Short-term debt	500
Long-term debt	12,636
Trust Preferred Securities Not Carried At Fair Value	308
Total Liabilities Not Carried At Fair Value Not Carried At Fair Value	14,847
U.S. Treasury And Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	723	745
U.S. Treasury And Agency [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	598	583
U.S. Treasury And Agency [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	125	162
U.S. Treasury And Agency [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	0	0
U.S. Treasury And Agency [Member] \| Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	700	733
Foreign [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	783	785
Foreign [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	0	0
Foreign [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	783	785
Foreign [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	0	0
Foreign [Member] \| Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	749	763
Corporate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	3,033	3,056
Corporate [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	0	0
Corporate [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	3,020	3,042
Corporate [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	13	14
Corporate [Member] \| Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	2,951	3,054
Collateralized Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	1,716	1,743
Collateralized Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	0	0
Collateralized Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	1,716	1,743
Collateralized Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	0	0
Collateralized Mortgage Backed Securities [Member] \| Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	1,652	1,707
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	5,325	2,223
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	5,325	2,223
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	0	0
US States and Political Subdivisions Debt Securities [Member] \| Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)	5,228	2,173
Financial Instruments Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Repurchase Agreements	1,403	1,404
Short-term Debt, Fair Value	519
Long-term debt		9,678
Long-term Debt, Fair Value	13,317
Trust Preferred Securities Not Carried At Fair Value	433	446
Total Liabilities Not Carried At Fair Value Not Carried At Fair Value	15,672	11,528
Financial Instruments Fair Value [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Repurchase Agreements	1,403	1,404
Short-term Debt, Fair Value	519
Long-term Debt, Fair Value	13,317	9,678
Trust Preferred Securities Not Carried At Fair Value	433	446
Total Liabilities Not Carried At Fair Value Not Carried At Fair Value	$ 15,672	$ 11,528

Assumed Life Reinsurance Prog54

Assumed Life Reinsurance Programs Involving Minimum Benefit Guarantees Under Annuity Contracts (Schedule Of Guaranteed Minimum Benefits Income And Expense) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Guaranteed Minimum Benefits [Line Items]
Net premiums earned	$ 6,597	$ 3,927
Policy benefits and other reserve adjustments	126	142
Net realized gains (losses)	(394)	(89)
Guaranteed Minimum Death Benefit [Member]
Guaranteed Minimum Benefits [Line Items]
Net premiums earned	14	16
Policy benefits and other reserve adjustments	8	9
Guaranteed Living Benefit [Member]
Guaranteed Minimum Benefits [Line Items]
Net premiums earned	29	32
Policy benefits and other reserve adjustments	11	12
Net realized gains (losses)	(234)	(45)
Loss recognized in Net income	(216)	(25)
Less: Net cash received	18	28
Net increase in liability	$ (234)	$ (53)

Assumed Life Reinsurance Prog55

Assumed Life Reinsurance Programs Involving Minimum Benefit Guarantees Under Annuity Contracts (Narrative) (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Guaranteed Minimum Death Benefit [Member]
Guaranteed Minimum Benefits [Line Items]
Reported liabilities	$ 115	$ 117
Guaranteed Living Benefit [Member]
Guaranteed Minimum Benefits [Line Items]
Reported liabilities	1,100	888	$ 716	$ 663
Fair value derivative adjustment in liability	$ 839	$ 609

Goodwill and other intangible56

Goodwill and other intangible assets Goodwill Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Jan. 14, 2016	Dec. 31, 2015
Goodwill [Line Items]
Other Intangible Assets, Net	$ 8,000		$ 887
Goodwill [Roll Forward]
Goodwill, beginning of period	4,796
Goodwill, Acquired During Period	10,445
Goodwill, Translation Adjustments	163
Goodwill, end of period	15,404
North America Commercial P&C Insurance [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	1,203
Goodwill, Acquired During Period	5,667
Goodwill, Translation Adjustments	40
Goodwill, end of period	6,910
North America Personal P&C Insurance [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	196
Goodwill, Acquired During Period	2,025
Goodwill, Translation Adjustments	13
Goodwill, end of period	2,234
North America Agricultural Insurance [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	134
Goodwill, Acquired During Period	0
Goodwill, Translation Adjustments	0
Goodwill, end of period	134
Overseas General Insurance [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	2,078
Goodwill, Acquired During Period	2,753
Goodwill, Translation Adjustments	109
Goodwill, end of period	4,940
Global Reinsurance [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	365
Goodwill, Acquired During Period	0
Goodwill, Translation Adjustments	0
Goodwill, end of period	365
Life Insurance [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	820
Goodwill, Acquired During Period	0
Goodwill, Translation Adjustments	1
Goodwill, end of period	821
The Chubb Corporation [Member]
Goodwill [Roll Forward]
Deferred Tax Liabilities, Intangible Assets	$ 2,465	$ 2,679
Increase Decrease on Acquired Unpaid Losses and Loss Expenses		$ 715
The Chubb Corporation [Member] \| Minimum [Member]
Goodwill [Roll Forward]
Amortization Period of Increase Decrease to Acquired Unpaid Losses and Loss Expenses	5 years
The Chubb Corporation [Member] \| Maximum [Member]
Goodwill [Roll Forward]
Amortization Period of Increase Decrease to Acquired Unpaid Losses and Loss Expenses	17 years

Goodwill and other intangible57

Goodwill and other intangible assets Schedule of finite-lived intangible assets acquired (Details) - USD ($) $ in Millions	Jan. 14, 2016	Mar. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Total identified intangible assets acquired	$ 7,655
Unearned premium reserves [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 1,550
Estimated Useful Life		1 year
Agency distribution relationships and renewal rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 3,150
Estimated Useful Life		24 years
Internally Developed Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 95
Estimated Useful Life		3 years
Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired		$ 2,800
Syndicate capacity [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired		10
Licenses [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired		$ 50

Goodwill and other intangible58

Goodwill and other intangible assets Intangible Assets (Estimated Amortization Expense Over the Next Five Years (Details) $ in Millions	Mar. 31, 2016USD ($)
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense Next Three Months	$ 1
Finite-Lived Intangible Assets Amortization Expense Next Three to Six Months	1
Finite-Lived Intangible Assets, Amortization Expense Next Six to Nine Months	1
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	244
Finite-Lived Intangible Assets, Amortization Expense, Year Two	321
Finite-Lived Intangible Assets, Amortization Expense, Year Three	281
Finite-Lived Intangible Assets, Amortization Expense, Year Four	262
Finite-Lived Intangible Assets, Amortization Expense, Year Five	248
FiniteLivedIntangibleAssetsAmortizationExpenseTotal	1,359
The Chubb Corporation [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense Next Three Months	(20)
Finite-Lived Intangible Assets Amortization Expense Next Three to Six Months	(20)
Finite-Lived Intangible Assets, Amortization Expense Next Six to Nine Months	(20)
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	165
Finite-Lived Intangible Assets, Amortization Expense, Year Two	251
Finite-Lived Intangible Assets, Amortization Expense, Year Three	217
Finite-Lived Intangible Assets, Amortization Expense, Year Four	204
Finite-Lived Intangible Assets, Amortization Expense, Year Five	196
FiniteLivedIntangibleAssetsAmortizationExpenseTotal	973
Agency distribution relationships and renewal rights [Member] \| The Chubb Corporation [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense Next Three Months	33
Finite-Lived Intangible Assets Amortization Expense Next Three to Six Months	33
Finite-Lived Intangible Assets, Amortization Expense Next Six to Nine Months	33
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	293
Finite-Lived Intangible Assets, Amortization Expense, Year Two	320
Finite-Lived Intangible Assets, Amortization Expense, Year Three	279
Finite-Lived Intangible Assets, Amortization Expense, Year Four	239
Finite-Lived Intangible Assets, Amortization Expense, Year Five	216
FiniteLivedIntangibleAssetsAmortizationExpenseTotal	1,446
Internally Developed Technology [Member] \| The Chubb Corporation [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense Next Three Months	8
Finite-Lived Intangible Assets Amortization Expense Next Three to Six Months	8
Finite-Lived Intangible Assets, Amortization Expense Next Six to Nine Months	8
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	32
Finite-Lived Intangible Assets, Amortization Expense, Year Two	32
Finite-Lived Intangible Assets, Amortization Expense, Year Three	0
Finite-Lived Intangible Assets, Amortization Expense, Year Four	0
Finite-Lived Intangible Assets, Amortization Expense, Year Five	0
FiniteLivedIntangibleAssetsAmortizationExpenseTotal	88
Fair Value Adjustment to Acquired Loss Reserves [Member] \| The Chubb Corporation [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense Next Three Months	(61)
Finite-Lived Intangible Assets Amortization Expense Next Three to Six Months	(61)
Finite-Lived Intangible Assets, Amortization Expense Next Six to Nine Months	(61)
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	(160)
Finite-Lived Intangible Assets, Amortization Expense, Year Two	(101)
Finite-Lived Intangible Assets, Amortization Expense, Year Three	(62)
Finite-Lived Intangible Assets, Amortization Expense, Year Four	(35)
Finite-Lived Intangible Assets, Amortization Expense, Year Five	(20)
FiniteLivedIntangibleAssetsAmortizationExpenseTotal	(561)
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense Next Three Months	21
Finite-Lived Intangible Assets Amortization Expense Next Three to Six Months	21
Finite-Lived Intangible Assets, Amortization Expense Next Six to Nine Months	21
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	79
Finite-Lived Intangible Assets, Amortization Expense, Year Two	70
Finite-Lived Intangible Assets, Amortization Expense, Year Three	64
Finite-Lived Intangible Assets, Amortization Expense, Year Four	58
Finite-Lived Intangible Assets, Amortization Expense, Year Five	52
FiniteLivedIntangibleAssetsAmortizationExpenseTotal	$ 386

Goodwill and other intangible59

Goodwill and other intangible assets Changes in Deferred Tax Liabilities due to Intangible Asset Amortization For the Next Five Years (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Changes in Deferred Tax Liabilities due to Intangible Asset Amortization [Line Items]
Decrease to Deferred Tax Liability Due to Intangible Amortization, Next Three to Six Months	$ (126)
Unearned Premium Reserves Amortization, Next Three Months	11,580	$ 8,552
The Chubb Corporation [Member]
Changes in Deferred Tax Liabilities due to Intangible Asset Amortization [Line Items]
Decrease to Deferred Tax Liability Due to Intangible Amortization, Next Three Months	(196)
Decrease to Deferred Tax Liability Due to Intangible Amortization, Next Six to Nine Months	(65)
Decrease to Deferred Tax Liability Due to Intangible Amortization, Next Twelve Months	(114)
Decrease to Deferred Tax Liability Due to Intangible Amortization, Year Two	(123)
Decrease to Deferred Tax Liability Due to Intangible Amortization, Year 3	(98)
Decrease to Deferred Tax Liability Due to Intangible Amortization, Year 4	(84)
Decrease to Deferred Tax Liability Due to Intangible Amortization, Year 5	(75)
Decrease to Deferred Tax Liability Due to Intangible Amortization, Total	(881)
Unearned Premium Reserves Amortization, Next Three Months	518
Unearned Premium Reserves Amortization, Next Three to Six Months	319
Unearned Premium Reserves Amortization, Next Six to Nine Months	143
Unearned Premium Reserves Amortization, Next Twelve Months	0
Unearned Premium Reserves Amortization, Year Two	0
Unearned Premium Reserves Amortization, Year Three	0
Unearned Premium Reserves Amortization, Year Four	0
Unearned Premium Reserves Amortization, Year Five	0
Unearned Premium Reserves Amortization, Total	$ 980

Debt (Details)

Debt (Details) - USD ($) $ in Millions	Mar. 31, 2016	Jan. 14, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt	$ 12,636		$ 9,389
Repurchase Agreements	1,403		$ 1,404
The Chubb Corporation [Member]
Debt Instrument [Line Items]
Long-term debt		$ 3,760
Face amount of debt		$ 3,300
Chubb INA Senior Notes Due 2067 [Member]
Debt Instrument [Line Items]
Face amount of debt	$ 1,000
Junior Subordinated Debt [Member] \| Chubb INA Senior Notes Due 2067 [Member]
Debt Instrument [Line Items]
Interest Rate	6.375%
Junior Subordinated Debt [Member] \| Chubb INA Capital Securities Due 2067 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 948
Interest Rate	6.375%

Debt (Schedule of Debt Outstand

Debt (Schedule of Debt Outstanding) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Repurchase Agreements	$ 1,403	$ 1,404
Short-term debt	500	0
Long-term debt	12,636	9,389
Trust preferred securities	308	307
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	12,636	9,389
Senior Notes [Member] \| ACE INA Senior Notes Due February 2017 [Member]
Debt Instrument [Line Items]
Short-term debt	$ 500	0
Interest Rate	5.70%
Long-term debt	$ 0	500
Make Whole Premium Additional Percent	0.20%
Senior Notes [Member] \| ACE INA Senior Notes Due March 2018 [Member]
Debt Instrument [Line Items]
Interest Rate	5.80%
Long-term debt	$ 299	299
Make Whole Premium Additional Percent	0.35%
Senior Notes [Member] \| Chubb INA Senior Notes Due May 2018 [Member]
Debt Instrument [Line Items]
Interest Rate	5.75%
Long-term debt	$ 654	0
Make Whole Premium Additional Percent	0.30%
Senior Notes [Member] \| ACE INA Senior Notes Due June 2019 [Member]
Debt Instrument [Line Items]
Interest Rate	5.90%
Long-term debt	$ 497	497
Make Whole Premium Additional Percent	0.40%
Senior Notes [Member] \| ACE INA senior notes due 2020 [Member]
Debt Instrument [Line Items]
Interest Rate	2.30%
Long-term debt	$ 1,293	1,294
Make Whole Premium Additional Percent	0.15%
Senior Notes [Member] \| ACE INA senior notes due 2022 [Member]
Debt Instrument [Line Items]
Interest Rate	2.875%
Long-term debt	$ 993	994
Make Whole Premium Additional Percent	0.20%
Senior Notes [Member] \| ACE INA Senior Notes Due March 2023 [Member]
Debt Instrument [Line Items]
Interest Rate	2.70%
Long-term debt	$ 471	471
Make Whole Premium Additional Percent	0.10%
Senior Notes [Member] \| ACE INA Senior Notes Due May 2024 [Member]
Debt Instrument [Line Items]
Interest Rate	3.35%
Long-term debt	$ 694	694
Make Whole Premium Additional Percent	0.15%
Senior Notes [Member] \| ACE INA senior notes due 2025 [Member]
Debt Instrument [Line Items]
Interest Rate	3.15%
Long-term debt	$ 794	794
Make Whole Premium Additional Percent	0.15%
Senior Notes [Member] \| ACE INA senior notes due 2026 [Member]
Debt Instrument [Line Items]
Interest Rate	3.35%
Long-term debt	$ 1,487	1,487
Make Whole Premium Additional Percent	0.20%
Senior Notes [Member] \| ACE INA Senior Notes Due May 2036 [Member]
Debt Instrument [Line Items]
Interest Rate	6.70%
Long-term debt	$ 297	297
Make Whole Premium Additional Percent	0.20%
Senior Notes [Member] \| Chubb INA Senior Notes Due 2037 [Member]
Debt Instrument [Line Items]
Interest Rate	6.00%
Long-term debt	$ 992	0
Make Whole Premium Additional Percent	0.20%
Senior Notes [Member] \| Chubb INA Senior Notes Due 2038 [Member]
Debt Instrument [Line Items]
Interest Rate	6.50%
Long-term debt	$ 784	0
Make Whole Premium Additional Percent	0.30%
Senior Notes [Member] \| ACE INA Senior Notes Due March 2043 [Member]
Debt Instrument [Line Items]
Interest Rate	4.15%
Long-term debt	$ 469	469
Make Whole Premium Additional Percent	0.15%
Senior Notes [Member] \| ACE INA senior notes due 2045 [Member]
Debt Instrument [Line Items]
Interest Rate	4.35%
Long-term debt	$ 1,482	1,482
Make Whole Premium Additional Percent	0.25%
Senior Notes [Member] \| Pennsylvania Industrial Development Authority (PIDA) AND City Of Philadelphia Urban Development Action Grant [Member]
Debt Instrument [Line Items]
Long-term debt	$ 11	11
Junior Subordinated Debt [Member] \| Chubb INA Capital Securities Due 2067 [Member]
Debt Instrument [Line Items]
Interest Rate	6.375%
Long-term debt	$ 948
Debentures Subject to Mandatory Redemption [Member] \| Chubb INA Senior Notes Due August 2018 [Member]
Debt Instrument [Line Items]
Interest Rate	6.60%
Long-term debt	$ 111
Debentures Subject to Mandatory Redemption [Member] \| ACE INA Senior Notes Due August 2029 [Member]
Debt Instrument [Line Items]
Interest Rate	8.875%
Long-term debt	$ 100	100
Unsecured Debt [Member] \| Chubb INA Senior Notes Due 2031 [Member]
Debt Instrument [Line Items]
Interest Rate	6.80%
Long-term debt	$ 260
Make Whole Premium Additional Percent	0.25%
Trust Preferred Securities [Member] \| ACE INA Capital Securities Due 2030 [Member]
Debt Instrument [Line Items]
Trust preferred securities	$ 308	307
Repurchase Agreements [Member]
Debt Instrument [Line Items]
Repurchase Agreements	$ 1,403	$ 1,404
Short-term Debt, Weighted Average Interest Rate	0.80%	0.60%
Minimum [Member] \| Senior Notes [Member] \| Pennsylvania Industrial Development Authority (PIDA) AND City Of Philadelphia Urban Development Action Grant [Member]
Debt Instrument [Line Items]
Interest Rate	2.75%
Minimum [Member] \| Junior Subordinated Debt [Member] \| Chubb INA Capital Securities Due 2067 [Member]
Debt Instrument [Line Items]
Make Whole Premium Additional Percent	0.25%
Maximum [Member] \| Senior Notes [Member] \| Pennsylvania Industrial Development Authority (PIDA) AND City Of Philadelphia Urban Development Action Grant [Member]
Debt Instrument [Line Items]
Interest Rate	7.10%
Maximum [Member] \| Junior Subordinated Debt [Member] \| Chubb INA Capital Securities Due 2067 [Member]
Debt Instrument [Line Items]
Make Whole Premium Additional Percent	0.50%

Commitments, Contingencies, A62

Commitments, Contingencies, And Guarantees (Balance Sheet Locations, Fair Values In Asset Or (Liability) Position, And Notional Values/Payment Provisions Of Derivative Instruments) (Detail) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Foreign Exchange Future [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		$ 903	$ 1,029
Cross Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		95	95
Futures contracts on notes and bonds [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		1,235	751
Convertibles and Bonds with Warrants Attached [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[1]	7	40
Investment And Embedded Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		14	43
Notional Value/Payment Provision		2,240	1,915
Single-Stock Future [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[2]	1,171	1,197
Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		71	15
Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		1,242	1,212
Guaranteed Living Benefits [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[3]	1,377	1,155
Other Assets [Member] \| Foreign Exchange Future [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		6	7
Other Assets [Member] \| Futures contracts on notes and bonds [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		5	5
Other Assets [Member] \| Single-Stock Future [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset	[2]	0	0
Other Assets [Member] \| Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		0	0
Other Assets [Member] \| Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		0	0
Other Assets [Member] \| Guaranteed Living Benefits [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset	[3]		0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] \| Foreign Exchange Future [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(19)	(11)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] \| Futures contracts on notes and bonds [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(4)	(2)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] \| Convertibles and Bonds with Warrants Attached [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability	[1]	0	0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] \| Investment And Embedded Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(23)	(13)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] \| Single-Stock Future [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability	[2]	(36)	(4)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] \| Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(10)	(6)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] \| Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(46)	(10)
Fixed Maturities Available For Sale [Member] \| Convertibles and Bonds with Warrants Attached [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset	[1]	3	31
Accounts Payable Future Policy Benefits [Member] \| Guaranteed Living Benefits [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability	[3]	$ (1,122)	$ (888)

[1]	Includes fair value of embedded derivatives.
[2]	Related to GMDB and GLB blocks of business.
[3]	Includes both future policy benefits reserves and fair value derivative adjustment. Refer to Note 5 for additional information. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts.

Commitments, contingencies, a63

Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Document Period End Date	Mar. 31, 2016
Repurchase Agreements	$ 1,403	$ 1,404
Assets pledged under repurchase agreements	1,473	1,459
Securities lending collateral	1,003	1,046
Securities lending payable	1,004	$ 1,047
U.S. Treasury And Agency [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	238
Collateralized Mortgage Backed Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	1,235
Repurchase Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Secured Borrowings, Gross, Difference, Amount	70
Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Secured Borrowings, Gross, Difference, Amount	(1)
Overnight and Continuous [Member] \| Cash and Cash Equivalents [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	434
Overnight and Continuous [Member] \| U.S. Treasury And Agency [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	$ 89

Commitments, Contingencies, A64

Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)		$ (284)	$ (56)
Foreign Exchange Future [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)		(10)	25
All Other Futures Contracts And Options [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)		(34)	(29)
Convertibles and Bonds with Warrants Attached [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	[1]	5	5
Investment And Embedded Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)		(39)	1
Guaranteed Living Benefits [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	[2]	(228)	(45)
Single-Stock Future [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	[3]	(15)	(11)
Options On Equity Market Indices [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	[3]	0	(1)
Guaranteed Living Benefit And Other Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)		(245)	(57)
Other Derivatives [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)		$ (2)	$ 0

[1]	(1) Includes embedded derivatives.
[2]	(2) Excludes foreign exchange gains (losses) related to GLB
[3]	(3) Related to GMDB and GLB blocks of business.

Commitments, Contingencies, A65

Commitments, Contingencies, And Guarantees (Narrative) (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities lending collateral	$ 1,003	$ 1,046
Carrying value of limited partnerships and partially-owned investment companies included in other investments	3,400
Funding commitments relating to limited partnerships and partially-owned investment companies	2,100
Unrecognized tax benefits	19
Derivative liability subject to a master netting agreement	(44)	$ 1
Purchase Commitment, Remaining Minimum Amount Committed	243
Overnight and Continuous [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Secured Borrowings, Gross, Difference, Amount	1
Cash and Cash Equivalents [Member] \| Overnight and Continuous [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities lending collateral	434
U.S. Treasury And Agency [Member] \| Overnight and Continuous [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities lending collateral	89
Corporate [Member] \| Overnight and Continuous [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities lending collateral	$ 2

Commitments, contingencies, a66

Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Transactions accounted for as secured borrowings) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	$ 1,003	$ 1,046
Securities lending payable	1,004	$ 1,047
Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Secured Borrowings, Gross, Difference, Amount	(1)
Cash and Cash Equivalents [Member] \| Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	434
Equity Securities [Member] \| Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	266
Corporate [Member] \| Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	2
Foreign Government Debt [Member] \| Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	212
U.S. Treasury And Agency [Member] \| Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	$ 89

Shareholders' equity Sharehol67

Shareholders' equity Shareholders' equity (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)$ / sharesshares	Mar. 31, 2016USD ($)SFr / sharesshares	Mar. 31, 2015USD ($)$ / sharesshares	Mar. 31, 2015USD ($)SFr / shares	Mar. 31, 2016SFr / shares	Dec. 31, 2015SFr / sharesshares	May. 31, 2015$ / shares	Jan. 01, 2015USD ($)	May. 31, 2014$ / shares
Equity, Class of Treasury Stock [Line Items]
Common Shares in treasury, shares \| shares	15,500,344	15,500,344				18,268,971
Par Value Reduction \| (per share)	$ 0	SFr 0	$ 0.65	SFr 0.62
Dividends Declared From Additional Paid In Capital \| (per share)	0.67	0.66	0	0
Annual dividend per share approved by shareholders \| $ / shares							$ 2.68		$ 2.60
Dividends declared per common share \| (per share)	0.67	SFr 0.66	0.65	SFr 0.62
Common Stock, Dividend Rate, Per-Dollar-Amount \| $ / shares	$ 0.67		$ 0.65
Common Shares, par value \| SFr / shares					SFr 24.15	SFr 24.15
2015 Stock Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Common Shares repurchased	$ 0		$ 340
Repurchase of outstanding common shares, shares \| shares	0		3,027,463
Share repurchase authorization remains	$ 0	SFr 0	$ 1,160	SFr 1,160
Stock repurchase program, authorized amount								$ 1,500

Share-Based Compensation (Detai

Share-Based Compensation (Detail) - USD ($) $ / shares in Units, $ in Millions	Feb. 25, 2016	Jan. 14, 2016	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period in years			3 years
Stock option term in years			10 years
The Chubb Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option term in years			10 years
Restricted stock award and units vesting period in years			3 years
Attributed Value Equity Awards Assumed in Acquisition		$ 323
Total Value of Equity Awards Issued in Acquisition		$ 525
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	1,926,842
Weighted-average grant date fair value for stock options granted	$ 21.52
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award and units vesting period in years			4 years
Restricted stock awards granted to employees and officers of the company	1,119,686
Grant date fair value of awards except for options granted to employees and officers of the company	$ 118.39
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units awarded to employees and officers of the company	337,581
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award and units vesting period in years			4 years
Restricted stock units awarded to employees and officers of the company	452,820

Postretirement benefits (Detail

Postretirement benefits (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
Postretirement benefits (Details) - USD ($) $ in Millions	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Jan. 14, 2016
Defined Benefit Plan Disclosure [Line Items]
Contributions During Current Period	$ 27
Expected Contribution For Remainder of Year	38
Service Cost		$ 2
Interest Cost		5
Expected Return on Plan Assets		(7)
Amortization of Actuarial (Gain) Loss		1
Net Periodic Benefit Cost		1
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	22
Interest Cost	35
Expected Return on Plan Assets	(47)
Amortization of Actuarial (Gain) Loss	1
Net Periodic Benefit Cost	$ 11
Pension Plan [Member] \| The Chubb Corporation [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets				$ 2,788
Projected Benefit Obligation				(3,525)
Funded Status of Plan				(737)
Pension Plan [Member] \| U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of Compensation Increase	4.00%
Expected Long-term Rate of Return on Plan Assets Assumption	7.00%
Discount Rate	4.28%
Service Cost	$ 17	0
Interest Cost	27	0
Expected Return on Plan Assets	(37)	0
Amortization of Actuarial (Gain) Loss	0	0
Net Periodic Benefit Cost	$ 7	0
Pension Plan [Member] \| U.S. [Member] \| The Chubb Corporation [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets				2,473
Projected Benefit Obligation				(3,153)
Funded Status of Plan				(680)
Pension Plan [Member] \| Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of Compensation Increase	3.40%		3.09%
Expected Long-term Rate of Return on Plan Assets Assumption	4.90%		4.81%
Discount Rate	3.74%		3.51%
Service Cost	$ 5	2
Interest Cost	8	5
Expected Return on Plan Assets	(10)	(7)
Amortization of Actuarial (Gain) Loss	1	1
Net Periodic Benefit Cost	4	$ 1
Pension Plan [Member] \| Non-US [Member] \| The Chubb Corporation [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets				315
Projected Benefit Obligation				(372)
Funded Status of Plan				(57)
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	2
Interest Cost	5
Expected Return on Plan Assets	(2)
Amortization of Actuarial (Gain) Loss	0
Net Periodic Benefit Cost	$ 5
Other Postretirement Benefit Plan [Member] \| The Chubb Corporation [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets				138
Projected Benefit Obligation				(506)
Funded Status of Plan				(368)
Other Postretirement Benefit Plan [Member] \| U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected Long-term Rate of Return on Plan Assets Assumption	7.00%
Discount Rate	4.41%
Service Cost	$ 2
Interest Cost	5
Expected Return on Plan Assets	(2)
Amortization of Actuarial (Gain) Loss	0
Net Periodic Benefit Cost	$ 5
Other Postretirement Benefit Plan [Member] \| U.S. [Member] \| The Chubb Corporation [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets				138
Projected Benefit Obligation				(491)
Funded Status of Plan				(353)
Other Postretirement Benefit Plan [Member] \| Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.30%
Service Cost	$ 0
Interest Cost	0
Expected Return on Plan Assets	0
Amortization of Actuarial (Gain) Loss	0
Net Periodic Benefit Cost	$ 0
Other Postretirement Benefit Plan [Member] \| Non-US [Member] \| The Chubb Corporation [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets				0
Projected Benefit Obligation				(15)
Funded Status of Plan				$ (15)

Segment Information (Operations

Segment Information (Operations By Segment) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net premiums written	$ 5,995	$ 4,076
Net premiums earned	6,597	3,927
Losses and loss expenses	3,674	2,122
Policy benefits	126	142
Policy acquisition costs	1,413	707
Administrative expenses	772	554
Underwriting income (loss)	612	402
Net investment income	674	551
Segment Income (loss)	1,286	953
Net realized gains (losses) including OTTI	(394)	(89)
Interest expense	146	68
(Gains) losses from fair value changes in separate account assets	3	(11)
Other	25	(24)
Other (income) expense	28	(35)
Amortization of purchased intangibles	7	30
Chubb integration expenses	148	0
Income tax expense	124	120
Net income (loss)	439	681
North America Commercial P&C Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	2,302	1,297
Net premiums earned	2,896	1,380
Losses and loss expenses	1,747	915
Policy acquisition costs	482	130
Administrative expenses	266	151
Underwriting income (loss)	401	184
Net investment income	426	258
Segment Income (loss)	827	442
North America Personal P&C Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	871	133
Net premiums earned	1,024	146
Losses and loss expenses	661	111
Policy acquisition costs	249	31
Administrative expenses	88	19
Underwriting income (loss)	26	(15)
Net investment income	47	5
Segment Income (loss)	73	$ (10)
Net realized gains (losses) including OTTI
Interest expense
Other
Amortization of purchased intangibles
Income tax expense
Net income (loss)
North America Agricultural Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	64	$ 88
Net premiums earned	23	64
Losses and loss expenses	(30)	22
Policy acquisition costs	4	(4)
Administrative expenses	(4)	(1)
Underwriting income (loss)	53	47
Net investment income	5	6
Segment Income (loss)	58	$ 53
Net realized gains (losses) including OTTI
Interest expense
Other
Amortization of purchased intangibles
Income tax expense
Net income (loss)
Overseas General Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	2,041	$ 1,794
Net premiums earned	1,955	1,637
Losses and loss expenses	1,021	814
Policy acquisition costs	503	389
Administrative expenses	263	256
Underwriting income (loss)	168	178
Net investment income	146	138
Segment Income (loss)	314	$ 316
Net realized gains (losses) including OTTI
Interest expense
Other
Amortization of purchased intangibles
Income tax expense
Net income (loss)
Global Reinsurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	201	$ 273
Net premiums earned	202	226
Losses and loss expenses	89	99
Policy acquisition costs	53	54
Administrative expenses	14	12
Underwriting income (loss)	46	61
Net investment income	67	75
Segment Income (loss)	113	$ 136
Net realized gains (losses) including OTTI
Interest expense
Other
Amortization of purchased intangibles
Income tax expense
Net income (loss)
Life Insurance [Member]
Segment Reporting Information [Line Items]
Life underwriting income	64
Net premiums written	516	$ 491
Net premiums earned	497	474
Losses and loss expenses	177	152
Policy benefits	126	142
Policy acquisition costs	122	107
Administrative expenses	72	73
Underwriting income (loss)	0	0
Net investment income	67	66
Segment Income (loss)	67	$ 66
Net realized gains (losses) including OTTI
Interest expense
(Gains) losses from fair value changes in separate account assets	3
Other
Amortization of purchased intangibles
Income tax expense
Net income (loss)
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Losses and loss expenses	9	$ 9
Policy acquisition costs		0
Administrative expenses	73	44
Underwriting income (loss)	(82)	(53)
Net investment income	(84)	3
Segment Income (loss)	(166)	(50)
Net realized gains (losses) including OTTI	(394)	(89)
Interest expense	146	68
(Gains) losses from fair value changes in separate account assets	3	(11)
Other	25	(24)
Amortization of purchased intangibles	7	30
Chubb integration expenses	148
Income tax expense	124	120
Net income (loss)	$ (1,013)	$ (322)

Earnings Per Share (Detail)

Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 439	$ 681
Weighted-average shares outstanding	446,739,586	328,212,376
Share-based compensation plans	3,270,156	3,480,344
Weighted-average shares outstanding and assumed conversions	450,009,742	331,692,720
Basic earnings per share (US$ per share)	$ 0.98	$ 2.08
Diluted earnings per share (US$ per share)	$ 0.97	$ 2.05
Potential anti-dilutive share conversions	2,074,308	715,148

Information provided in conne72

Information provided in connection with outstanding debt of subsidiaries Information provided in connection with outstanding debt of subsidiaries (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Jan. 14, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt	$ 12,636		$ 9,389
The Chubb Corporation [Member]
Debt Instrument [Line Items]
Intercompany Loan Agreements		$ 10,000
Par value of debt		3,300
Long-term debt		$ 3,760
Minimum [Member] \| The Chubb Corporation [Member]
Debt Instrument [Line Items]
Interest Rate		2.30%
Weighted Average Interest Rate		3.30%
Maximum [Member] \| The Chubb Corporation [Member]
Debt Instrument [Line Items]
Interest Rate		4.35%

Information Provided In Conne73

Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Detail) - USD ($) $ in Millions	Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015		Dec. 31, 2014	[4]
Condensed Financial Statements, Captions [Line Items]
Investments	$ 97,586		$ 66,251
Cash	1,091	[1],[2]	1,775	[1],[3]	$ 948	[4]	$ 655
Insurance and reinsurance balances receivable	7,692		5,323
Reinsurance recoverable on losses and loss expenses	12,891		11,386
Reinsurance recoverable on policy benefits	185		187
Value of business acquired	390		395
Goodwill	23,359		5,683
Investments in subsidiaries	0		0
Due from subsidiaries and affiliates, net	0		0
Other assets	13,450		11,306
Total assets	156,644		102,306
Unpaid losses and loss expenses	60,206		37,303
Unearned premiums	14,896		8,439
Future policy benefits	4,869		4,807
Due to subsidiaries and affiliates, net	0		0
Repurchase Agreements	1,403		1,404
Short-term debt	500		0
Affiliated notional cash pooling programs	0		0
Long-term debt	12,636		9,389
Trust preferred securities	308		307
Other liabilities	15,929		11,522
Total liabilities	110,747		73,171
Total shareholders' equity	45,897		29,135		29,702
Total liabilities and shareholders’ equity	156,644		102,306
Chubb Limited (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Investments	29		28
Cash	2	[1],[2]	1	[1],[3]	2	[4]	0
Insurance and reinsurance balances receivable	0		0
Reinsurance recoverable on losses and loss expenses	0		0
Reinsurance recoverable on policy benefits	0		0
Value of business acquired	0		0
Goodwill	0		0
Investments in subsidiaries	35,426		29,612
Due from subsidiaries and affiliates, net	11,267		644
Other assets	4		8
Total assets	46,728		30,293
Unpaid losses and loss expenses	0		0
Unearned premiums			0
Future policy benefits	0		0
Due to subsidiaries and affiliates, net	0		0
Repurchase Agreements	0		0
Short-term debt	0
Affiliated notional cash pooling programs	521	[2]	882	[3]
Long-term debt	0		0
Trust preferred securities	0		0
Other liabilities	310		276
Total liabilities	831		1,158
Total shareholders' equity	45,897		29,135
Total liabilities and shareholders’ equity	46,728		30,293
Chubb INA Holdings Inc (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Investments	643		7,839
Cash	3	[1],[2]	2	[1],[3]	366	[4]	1
Insurance and reinsurance balances receivable	0		0
Reinsurance recoverable on losses and loss expenses	0		0
Reinsurance recoverable on policy benefits	0		0
Value of business acquired	0		0
Goodwill	0		0
Investments in subsidiaries	49,240		18,386
Due from subsidiaries and affiliates, net	0		1,800
Other assets	503		457
Total assets	50,389		28,484
Unpaid losses and loss expenses	0		0
Unearned premiums			0
Future policy benefits	0		0
Due to subsidiaries and affiliates, net	11,199		0
Repurchase Agreements	0		0
Short-term debt	500
Affiliated notional cash pooling programs	799	[2]	89	[3]
Long-term debt	12,625		9,378
Trust preferred securities	308		307
Other liabilities	1,575		1,422
Total liabilities	27,006		11,196
Total shareholders' equity	23,383		17,288
Total liabilities and shareholders’ equity	50,389		28,484
Other Chubb Limited Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Investments	96,914		58,384
Cash	2,406	[1],[2]	2,743	[1],[3]	658	[4]	1,209
Insurance and reinsurance balances receivable	10,884		6,075
Reinsurance recoverable on losses and loss expenses	22,065		20,124
Reinsurance recoverable on policy benefits	1,144		1,129
Value of business acquired	390		395
Goodwill	23,359		5,683
Investments in subsidiaries	0		0
Due from subsidiaries and affiliates, net	0		0
Other assets	17,291		14,434
Total assets	174,453		108,967
Unpaid losses and loss expenses	68,917		45,490
Unearned premiums	18,522		10,243
Future policy benefits	5,828		5,749
Due to subsidiaries and affiliates, net	68		2,444
Repurchase Agreements	1,403		1,404
Short-term debt	0
Affiliated notional cash pooling programs	0	[2]	0	[3]
Long-term debt	11		11
Trust preferred securities	0		0
Other liabilities	18,421		12,916
Total liabilities	113,170		78,257
Total shareholders' equity	61,283		30,710
Total liabilities and shareholders’ equity	174,453		108,967
Consolidating Adjustments and Eliminations
Condensed Financial Statements, Captions [Line Items]
Investments	0		0
Cash	(1,320)	[1],[2]	(971)	[1],[3]	$ (78)	[4]	$ (555)
Insurance and reinsurance balances receivable	(3,192)		(752)
Reinsurance recoverable on losses and loss expenses	(9,174)		(8,738)
Reinsurance recoverable on policy benefits	(959)		(942)
Value of business acquired	0		0
Goodwill	0		0
Investments in subsidiaries	(84,666)		(47,998)
Due from subsidiaries and affiliates, net	(11,267)		(2,444)
Other assets	(4,348)		(3,593)
Total assets	(114,926)		(65,438)
Unpaid losses and loss expenses	(8,711)		(8,187)
Unearned premiums	(3,626)		(1,804)
Future policy benefits	(959)		(942)
Due to subsidiaries and affiliates, net	(11,267)		(2,444)
Repurchase Agreements	0		0
Short-term debt	0
Affiliated notional cash pooling programs	(1,320)	[2]	(971)	[3]
Long-term debt	0		0
Trust preferred securities	0		0
Other liabilities	(4,377)		(3,092)
Total liabilities	(30,260)		(17,440)
Total shareholders' equity	(84,666)		(47,998)
Total liabilities and shareholders’ equity	$ (114,926)		$ (65,438)

[1]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 and December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[4]	maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Information Provided In Conne74

Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	$ 5,995	$ 4,076
Net premiums earned	6,597	3,927
Net investment income	674	551
Equity in earnings of subsidiaries	0	0
Net realized gains (losses) including OTTI	(394)	(89)
Losses and loss expenses	3,674	2,122
Policy benefits	126	142
Policy acquisition costs and administrative expenses	2,185	1,261
Interest (income) expense	146	68
Other (income) expense	28	(35)
Amortization of purchased intangibles	7	30
Chubb integration expenses	148	0
Income tax expense	124	120
Net income (loss)	439	681
Comprehensive income (loss)	1,541	642
Chubb Limited (Parent Guarantor)
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	0	0
Net premiums earned	0	0
Net investment income	1	1
Equity in earnings of subsidiaries	375	648
Net realized gains (losses) including OTTI	0	0
Losses and loss expenses	0	0
Policy benefits	0	0
Policy acquisition costs and administrative expenses	17	14
Interest (income) expense	(80)	(8)
Other (income) expense	(9)	(41)
Amortization of purchased intangibles	0	0
Chubb integration expenses	3
Income tax expense	6	3
Net income (loss)	439	681
Comprehensive income (loss)	1,541	642
Chubb INA Holdings Inc (Subsidiary Issuer)
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	0	0
Net premiums earned	0	0
Net investment income	4	1
Equity in earnings of subsidiaries	506	204
Net realized gains (losses) including OTTI	0	0
Losses and loss expenses	0	0
Policy benefits	0	0
Policy acquisition costs and administrative expenses	36	6
Interest (income) expense	215	69
Other (income) expense	10	(3)
Amortization of purchased intangibles	0	0
Chubb integration expenses	137
Income tax expense	(150)	(26)
Net income (loss)	262	159
Comprehensive income (loss)	1,056	24
Other Chubb Limited Subsidiaries
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	5,995	4,076
Net premiums earned	6,597	3,927
Net investment income	669	549
Equity in earnings of subsidiaries	0	0
Net realized gains (losses) including OTTI	(394)	(89)
Losses and loss expenses	3,674	2,122
Policy benefits	126	142
Policy acquisition costs and administrative expenses	2,132	1,241
Interest (income) expense	11	7
Other (income) expense	27	9
Amortization of purchased intangibles	7	30
Chubb integration expenses	8
Income tax expense	268	143
Net income (loss)	619	693
Comprehensive income (loss)	1,721	654
Consolidating Adjustments and Eliminations
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	0	0
Net premiums earned	0	0
Net investment income	0	0
Equity in earnings of subsidiaries	(881)	(852)
Net realized gains (losses) including OTTI	0	0
Losses and loss expenses	0	0
Policy benefits	0	0
Policy acquisition costs and administrative expenses	0	0
Interest (income) expense	0	0
Other (income) expense	0	0
Amortization of purchased intangibles	0	0
Chubb integration expenses	0
Income tax expense	0	0
Net income (loss)	(881)	(852)
Comprehensive income (loss)	$ (2,777)	$ (678)

Information Provided In Conne75

Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015		Jan. 14, 2016
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	$ 1,020		$ 1,075
Purchases of fixed maturities available for sale	(8,104)		(4,336)
Purchases of fixed maturities held to maturity	(77)		(21)
Purchases of equity securities	(33)		(39)
Sales of fixed maturities available for sale	6,329		2,002
Sales of equity securities	761		28
Maturities and redemptions of fixed maturities available for sale	1,553		1,481
Maturities and redemptions of fixed maturities held to maturity	249		324
Net change in short-term investments	11,932		(255)
Net derivative instruments settlements	(22)		(51)
Cash Acquired from Acquisition	57		0
Payments to Acquire Businesses, Net of Cash Acquired	(14,262)		0
Capital contribution	0
Other	59		(153)
Net cash flows used for investing activities	(1,615)		(1,020)
Dividends paid on Common Shares	(218)		(214)
Common Shares repurchased	0		(347)
Proceeds from issuance of long-term debt	0		800
Proceeds from issuance of repurchase agreements	853		477
Repayments of Long-term Debt	853
Repayments of Short-term Debt	(853)		(477)
Proceeds from share-based compensation plans, including windfall tax benefits	51		39
Dividend to Parent Company	0
Capital contribution	0
Advances To From Affiliates Financing Activities	0		0
Net proceeds from (payments to) affiliated notional cash pooling program	0		0
Policyholder contract deposits	118		101
Policyholder contract withdrawals	(49)		(40)
Other	(4)		(6)
Net cash flows (used for) from financing activities	(102)		333
Effect of foreign currency rate changes on cash and cash equivalents	13		(95)
Net increase in cash	(684)		293
Cash – beginning of period	1,775	[1],[2]	655	[3]
Cash – end of period	1,091	[2],[4]	948	[3]
Chubb Limited (Parent Guarantor)
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	3,272		48
Purchases of fixed maturities available for sale	0		0
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Sales of fixed maturities available for sale	0		0
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	0		0
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	0		0
Net derivative instruments settlements	0		0
Capital contribution	(2,330)
Other	0		0
Net cash flows used for investing activities	(2,330)		0
Dividends paid on Common Shares	(218)		(214)
Common Shares repurchased			0
Proceeds from issuance of repurchase agreements			0
Repayments of Short-term Debt	0		0
Proceeds from share-based compensation plans, including windfall tax benefits	0		0
Dividend to Parent Company	0
Capital contribution	0
Advances To From Affiliates Financing Activities	(362)		336
Net proceeds from (payments to) affiliated notional cash pooling program	(361)	[2]	$ (168)	[3]
Policyholder contract deposits	0
Policyholder contract withdrawals	0		$ 0
Other	0		0
Net cash flows (used for) from financing activities	(941)		(46)
Effect of foreign currency rate changes on cash and cash equivalents	0		0
Net increase in cash	1		2
Cash – beginning of period	1	[1],[2]	0	[3]
Cash – end of period	2	[2],[4]	2	[3]
Chubb INA Holdings Inc (Subsidiary Issuer)
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	3,109		4
Purchases of fixed maturities available for sale	0		0
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Sales of fixed maturities available for sale	0		0
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	0		0
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	7,788		216
Net derivative instruments settlements	0		0
Payments to Acquire Businesses, Net of Cash Acquired	(14,282)
Capital contribution	0
Other	0		0
Net cash flows used for investing activities	(6,494)		216
Dividends paid on Common Shares	0		0
Common Shares repurchased			0
Proceeds from issuance of long-term debt			800
Proceeds from issuance of repurchase agreements			0
Repayments of Long-term Debt	0
Repayments of Short-term Debt	0		0
Proceeds from share-based compensation plans, including windfall tax benefits	0		0
Dividend to Parent Company	0
Capital contribution	2,330
Advances To From Affiliates Financing Activities	350		(340)
Net proceeds from (payments to) affiliated notional cash pooling program	710	[2]	$ (309)	[3]
Policyholder contract deposits	0
Policyholder contract withdrawals	0		$ 0
Other	(4)		(6)
Net cash flows (used for) from financing activities	3,386		145
Effect of foreign currency rate changes on cash and cash equivalents	0		0
Net increase in cash	1		365
Cash – beginning of period	2	[1],[2]	1	[3]
Cash – end of period	3	[2],[4]	366	[3]
Other Chubb Limited Subsidiaries
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	1,011		1,023
Purchases of fixed maturities available for sale	(8,104)		(4,336)
Purchases of fixed maturities held to maturity	(77)		(21)
Purchases of equity securities	(33)		(39)
Sales of fixed maturities available for sale	6,329		2,002
Sales of equity securities	761		28
Maturities and redemptions of fixed maturities available for sale	1,553		1,481
Maturities and redemptions of fixed maturities held to maturity	249		324
Net change in short-term investments	4,144		(471)
Net derivative instruments settlements	(22)		(51)
Payments to Acquire Businesses, Net of Cash Acquired	20
Capital contribution	(2,330)
Other	59		(153)
Net cash flows used for investing activities	2,549		(1,236)
Dividends paid on Common Shares	0		0
Common Shares repurchased			(347)
Proceeds from issuance of repurchase agreements			477
Repayments of Long-term Debt	(853)
Repayments of Short-term Debt	(853)		(477)
Proceeds from share-based compensation plans, including windfall tax benefits	51		39
Dividend to Parent Company	(6,372)
Capital contribution	2,330
Advances To From Affiliates Financing Activities	12		4
Net proceeds from (payments to) affiliated notional cash pooling program	0	[2]	0	[3]
Policyholder contract deposits	118		101
Policyholder contract withdrawals	(49)		(40)
Other	0		0
Net cash flows (used for) from financing activities	(3,910)		(243)
Effect of foreign currency rate changes on cash and cash equivalents	13		(95)
Net increase in cash	(337)		(551)
Cash – beginning of period	2,743	[1],[2]	1,209	[3]
Cash – end of period	2,406	[2],[4]	658	[3]
Consolidating Adjustments and Eliminations
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	(6,372)		0
Purchases of fixed maturities available for sale	0		0
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Sales of fixed maturities available for sale	0		0
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	0		0
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	0		0
Net derivative instruments settlements	0		0
Payments to Acquire Businesses, Net of Cash Acquired	0
Capital contribution	4,660
Other	0		0
Net cash flows used for investing activities	4,660		0
Dividends paid on Common Shares	0		0
Common Shares repurchased			0
Proceeds from issuance of repurchase agreements			0
Repayments of Short-term Debt	0		0
Proceeds from share-based compensation plans, including windfall tax benefits	0		0
Dividend to Parent Company	6,372
Capital contribution	(4,660)
Advances To From Affiliates Financing Activities	0		0
Net proceeds from (payments to) affiliated notional cash pooling program	(349)	[2]	$ 477	[3]
Policyholder contract deposits	0
Policyholder contract withdrawals	0		$ 0
Other	0		0
Net cash flows (used for) from financing activities	1,363		477
Effect of foreign currency rate changes on cash and cash equivalents	0		0
Net increase in cash	(349)		477
Cash – beginning of period	(971)	[1],[2]	(555)	[3]
Cash – end of period	$ (1,320)	[2],[4]	$ (78)	[3]
The Chubb Corporation [Member]
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Intercompany Loan Agreements					$ 10,000

[1]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 and December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3]	maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[4]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.