Chubb Limited (CB) 10-Q 3 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 21, 2016
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
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		465,339,149

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2016		Dec. 31, 2015
Investments [Abstract]
Fixed maturities available for sale, at fair value (amortized cost - $78,630 and $43,149) (includes hybrid financial instruments of $5 and $31)		$ 81,358		$ 43,587
Fixed maturities held to maturity, at amortized cost (fair value – $11,366 and $8,552)		10,927		8,430
Equity securities, at fair value (cost – $695 and $441)		803		497
Short-term investments, at fair value and amortized cost		3,548		10,446
Other investments (cost – $4,170 and $2,993)		4,400		3,291
Total investments		101,036		66,251
Cash	[1]	870	[2]	1,775	[3]
Securities lending collateral		1,140		1,046
Accrued investment income		915		513
Insurance and reinsurance balances receivable		8,493		5,323
Reinsurance recoverable on losses and loss expenses		13,448		11,386
Reinsurance recoverable on policy benefits		195		187
Deferred policy acquisition costs		4,238		2,873
Value of business acquired		368		395
Goodwill		15,481		4,796
Other intangible assets		6,991		887
Prepaid reinsurance premiums		2,449		2,082
Deferred tax assets		0		318
Investments in partially-owned insurance companies		665		653
Other assets		5,521		3,821
Total assets		161,810		102,306
Liabilities
Unpaid losses and loss expenses		61,347		37,303
Unearned premiums		15,054		8,439
Future policy benefits		5,010		4,807
Insurance and reinsurance balances payable		4,885		4,270
Securities lending payable		1,141		1,047
Accounts payable, accrued expenses, and other liabilities		9,748		6,205
Deferred tax liabilities		1,418		0
Repurchase agreements		1,406		1,404
Short-term debt		500		0
Long-term debt		12,621		9,389
Trust preferred securities		308		307
Total liabilities		113,438		73,171
Commitments and contingencies
Shareholders’ equity
Common Shares (CHF 24.15 par value; 479,783,864 and 342,832,412 shares issued; 465,286,110 and 324,563,441 shares outstanding)		11,121		7,833
Common Shares in treasury (14,497,754 and 18,268,971 shares)		(1,550)		(1,922)
Additional paid-in capital		15,601		4,481
Retained earnings		22,003		19,478
Accumulated other comprehensive income (loss) (AOCI)		1,197		(735)
Total shareholders’ equity		48,372		29,135
Total liabilities and shareholders’ equity		$ 161,810		$ 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 September 30, 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 September 30, 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	Sep. 30, 2016USD ($)shares	Dec. 31, 2015USD ($)shares
Statement of Financial Position [Abstract]
Available for sale, at amortized cost	$ 78,630	$ 43,149
Fixed maturities available for sale, hybrid financial instruments	5	31
Held to maturity, at Fair Value	11,366	8,552
Equity securities, at cost	695	441
Other investments, cost	$ 4,170	$ 2,993
Common Shares, shares issued | shares	479,783,864	342,832,412
Common Shares, shares outstanding | shares	465,286,110	324,563,441
Common Shares in treasury, shares | shares	14,497,754	18,268,971

Consolidated Statements Of Oper

Consolidated Statements Of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues
Net premiums written	$ 7,573	$ 4,709	$ 21,207	$ 13,569
Decrease (increase) in unearned premiums	115	10	483	(563)
Net premiums earned	7,688	4,719	21,690	13,006
Net investment income	739	549	2,121	1,662
Net Realized Gains Losses [Abstract]
Other-than-temporary impairment (OTTI) losses gross	(12)	(35)	(99)	(62)
Portion of OTTI losses recognized in other comprehensive income (OCI)	0	5	8	11
Net OTTI losses recognized in income	(12)	(30)	(91)	(51)
Net realized gains (losses) excluding OTTI losses	112	(367)	(419)	(309)
Total net realized gains (losses) (includes $33, $(49), $(117), and $(18) reclassified from AOCI)	100	(397)	(510)	(360)
Total revenues	8,527	4,871	23,301	14,308
Expenses
Losses and loss expenses	4,269	2,643	12,197	7,182
Policy benefits	155	89	427	384
Policy acquisition costs	1,514	771	4,487	2,205
Administrative expenses	772	568	2,373	1,700
Interest expense	152	68	451	207
Other (income) expense	(91)	12	(92)	(61)
Amortization of purchased intangibles	4	51	16	136
Chubb integration expenses	115	9	361	9
Total expenses	6,890	4,211	20,220	11,762
Income before income tax	1,637	660	3,081	2,546
Income tax expense (includes $11, $(4), $16 and $10 on reclassified unrealized gains and losses)	277	132	556	395
Net income	1,360	528	2,525	2,151
Other comprehensive income (loss)
Unrealized appreciation (depreciation)	247	(321)	2,099	(696)
Reclassification adjustment for net realized (gains) losses included in net income	(33)	49	117	18
Unrealized appreciation (Depreciation) after reclassification adjustment	214	(272)	2,216	(678)
Change in:
Cumulative translation adjustment	(124)	(575)	269	(860)
Pension liability	5	3	8	10
Other comprehensive income (loss), before income tax	95	(844)	2,493	(1,528)
Income tax (expense) benefit related to OCI items	(79)	45	(561)	145
Other comprehensive income (loss)	16	(799)	1,932	(1,383)
Comprehensive income (loss)	$ 1,376	$ (271)	$ 4,457	$ 768
Earnings per share
Basic earnings per share	$ 2.90	$ 1.63	$ 5.48	$ 6.60
Diluted earnings per share	$ 2.88	$ 1.62	$ 5.44	$ 6.53
The Chubb Corporation [Member]
Expenses
Chubb integration expenses		$ 9

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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Total net realized gains (losses) reclassified from AOCI	$ 33	$ (49)	$ (117)	$ (18)
Income tax expense on reclassified unrealized gains and loses	$ 11	$ (4)	$ 16	$ 10

Consolidated Statements Of Shar

Consolidated Statements Of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Common Stock [Member]The Chubb Corporation [Member]	Common shares in treasury [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]	Cumulative Translation Adjustment [Member]	Pension Liability 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)
Shares Issued for Chubb Corp Acquisition		0				$ 0
Dividends declared on Common Shares – par value reduction		(222)
Common Shares repurchased				(734)
Net shares redeemed under employee share-based compensation plans				208	(157)	0
Exercise of stock options					(43)
Share-based compensation expense and other					155
Funding of dividends declared to Retained earnings					(435)
Net income	$ 2,151						2,151
Funding of dividends declared from Additional paid-in capital							435
Dividends declared on Common Shares							(435)
Change in period, before reclassification from AOCI, net of income tax benefit (expense) of $(559) and $102								(594)
Amounts reclassified from AOCI, net of income tax benefit of $16 and $10								28
Change in period, net of income tax benefit (expense) of $(543) and $112								(566)
Change in period, net of income tax benefit (expense) of $(18) and $35									(825)
Change in period, net of income tax expense of nil and $(2)										8
Balance - end of period at Sep. 30, 2015	29,127	7,833		(1,974)	4,665		18,795	1,285	(1,406)	(71)	$ (192)
Balance - beginning of period at Dec. 31, 2015	29,135	7,833		(1,922)	4,481		19,478	874	(1,539)	(70)
Shares Issued for Chubb Corp Acquisition			$ 3,288			11,916
Dividends declared on Common Shares – par value reduction		0
Common Shares repurchased				0
Net shares redeemed under employee share-based compensation plans				372	(365)	$ 323
Exercise of stock options					(44)
Share-based compensation expense and other					250
Funding of dividends declared to Retained earnings					(960)
Net income	2,525						2,525
Funding of dividends declared from Additional paid-in capital							960
Dividends declared on Common Shares							(960)
Change in period, before reclassification from AOCI, net of income tax benefit (expense) of $(559) and $102								1,540
Amounts reclassified from AOCI, net of income tax benefit of $16 and $10								133
Change in period, net of income tax benefit (expense) of $(543) and $112								1,673
Change in period, net of income tax benefit (expense) of $(18) and $35									251
Change in period, net of income tax expense of nil and $(2)										8
Balance - end of period at Sep. 30, 2016	$ 48,372	$ 11,121		$ (1,550)	$ 15,601		$ 22,003	$ 2,547	$ (1,288)	$ (62)	$ 1,197

Consolidated Statements Of Sha7

Consolidated Statements Of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Statement Consolidated Statements Of Shareholders Equity [Abstract]
Change in year, before reclassification from AOCI, net of income tax benefit(expense)	$ (559)	$ 102
Income tax benefit (expense) from reclassification of unrealized gains	16	10
Net unrealized appreciation on investments, Change in period, income tax (expense) benefit	(543)	112
Cumulative translation adjustment, Change in period, income tax(expense) benefit	(18)	35
Net income	2,525	2,151
Pension liability adjustment, Change in period, income tax (expense) benefit	$ 0	$ (2)

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016		Sep. 30, 2015
Cash flows from operating activities
Net income	$ 2,525		$ 2,151
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	510		360
Amortization of premiums/discounts on fixed maturities	558		115
Amortization of UPR related to the Chubb Corp acquisition	1,415		0
Deferred income taxes	(13)		53
Unpaid losses and loss expenses	916		(225)
Unearned premiums	(547)		353
Future policy benefits	129		157
Insurance and reinsurance balances payable	149		219
Accounts payable, accrued expenses, and other liabilities	(109)		(179)
Income taxes payable	308		(8)
Insurance and reinsurance balances receivable	(201)		15
Reinsurance recoverable on losses and loss expenses	(241)		421
Reinsurance recoverable on policy benefits	(6)		20
Deferred policy acquisition costs	(1,316)		(354)
Prepaid reinsurance premiums	33		(182)
Other	(273)		(217)
Net cash flows from operating activities	3,837		2,699
Cash flows from investing activities
Purchases of fixed maturities available for sale	(23,837)		(13,029)
Purchases of to be announced mortgage-backed securities	0		(31)
Purchases of fixed maturities held to maturity	(189)		(39)
Purchases of equity securities	(100)		(122)
Sales of fixed maturities available for sale	13,863		5,202
Sales of to be announced mortgage-backed securities	0		31
Sales of equity securities	963		150
Maturities and redemptions of fixed maturities available for sale	6,936		5,257
Maturities and redemptions of fixed maturities held to maturity	627		552
Net change in short-term investments	11,866		421
Net derivative instruments settlements	(181)		62
Acquisition of subsidiaries (net of cash acquired of $71 and $620)	(14,248)		259
Other	26		(138)
Net cash flows used for investing activities	(4,274)		(1,425)
Cash flows from financing activities
Dividends paid on Common Shares	(851)		(644)
Common Shares repurchased	0		(758)
Proceeds from issuance of long-term debt	0		800
Proceeds from issuance of repurchase agreements	1,457		1,478
Repayment of long-term debt	0		(451)
Repayment of repurchase agreements	(1,455)		(1,477)
Proceeds from share-based compensation plans, including windfall tax benefits	117		89
Policyholder contract deposits	473		351
Policyholder contract withdrawals	(247)		(159)
Other	(4)		(6)
Net cash flows used for financing activities	(510)		(777)
Effect of foreign currency rate changes on cash and cash equivalents	42		(114)
Net (decrease) increase in cash	(905)		383
Cash – beginning of period	1,775	[1],[2]	655	[3]
Cash – end of period	870	[2],[4]	1,038	[3]
Supplemental cash flow information
Taxes paid	360		355
Interest paid	$ 390		$ 188
[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 September 30, 2016 and December 31, 2015, 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 September 30, 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 September 30, 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	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Statement of Cash Flows [Abstract]
Cash Acquired from Acquisition	$ 71	$ 620

General

General	9 Months Ended
	Sep. 30, 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), 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 Chubb Corp. We have also redefined Corporate to include all run-off asbestos and environmental (A&E) exposures, the results of our run-off Brandywine business, the results of Westchester specialty operations for 1996 and prior years, and certain run-off 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. Financial Instruments – Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, the FASB issued guidance that affects the recognition, measurement, presentation, and disclosure of financial instruments. The guidance requires equity investments to be measured at fair value with changes in fair value recognized through net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee) and an assessment of a valuation allowance on deferred tax assets related to unrealized losses of available for sale debt securities in combination with other deferred tax assets. The standard is effective for us in the first quarter of 2018. We are in the process of evaluating the effect the updated guidance will have on our financial condition and results of operations. Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued guidance on the accounting for credit losses of financial instruments that are measured at amortized cost, including held to maturity securities and reinsurance recoverables, by applying an approach based on the current expected credit losses (CECL). The estimate of expected credit losses should consider historical information, current information, as well as reasonable and supportable forecasts, including estimates of prepayments. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset in order to present the net carrying value at the amount expected to be collected on the financial asset on the Consolidated balance sheet. The guidance also amends the current available for sale (AFS) security other-than-temporary impairment model by requiring an estimate of the expected credit loss (ECL) only when the fair value is below the amortized cost of the asset. The length of time the fair value of an AFS debt security has been below the amortized cost will no longer impact the determination of whether a credit loss exists. The AFS debt security model will also require the use of a valuation allowance. The standard is effective for us in the first quarter of 2020 with early adoption permitted in the first quarter of 2019. We will be able to assess the effect of adopting this guidance on our financial condition and results of operations closer to the date of adoption. Stock Compensation In March 2016, the FASB issued guidance which requires recognition of the excess tax benefits or deficiencies of awards through net income rather than through additional paid in capital. Additionally, entities can elect to account for forfeitures related to share-based payments either as they occur or through an estimation method. If elected, the change to recognize forfeitures as they occur would be adopted using a modified retrospective approach, with a cumulative effect adjustment recorded to retained earnings. The updated guidance is effective for us in the first quarter of 2017 with early adoption permitted. Adoption of this guidance is not expected to have a material impact on our financial condition and results of operations. Statement of Cash Flows In August 2016, the FASB issued guidance clarifying the classification of certain cash receipts and cash payments within the statement of cash flows, including distributions received from equity method investments. The guidance requires entities to make an accounting policy election to present cash flows received either in operating cash flows or investing cash flows based on cumulative equity-method earnings or on the nature of the distributions. The updated guidance is effective for us in the first quarter of 2018 with early adoption permitted. The updated guidance should be applied retrospectively, unless it is impracticable to do so, at which point the guidance should be applied prospectively. We are in the process of evaluating the effect the updated guidance will have on our statements of cash flows.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
Acquisitions	Acquisitions The Chubb Corporation On January 14, 2016, we completed the acquisition of Chubb Corp, 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. Chubb Corp has 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 added to our presence and capabilities and positioned us to better pursue important market opportunities globally. The combined company is 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. During the second and third quarters of 2016, we reassessed certain components of our preliminary estimates of assets acquired and liabilities assumed, including the net realizable value for Reinsurance recoverables on losses and loss expenses and Insurance and reinsurance balances receivable and certain components of the Deferred tax liabilities, which resulted in an adjustment to our preliminary estimates that increased Goodwill by $85 million . These estimates remain preliminary and are subject to adjustment. 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 $ 71 Investments 42,967 Accrued investment income 337 Insurance and reinsurance balances receivable 2,981 Reinsurance recoverable on losses and loss expenses 1,645 Indefinite lived intangible assets 2,860 Finite lived intangible assets 4,795 Prepaid reinsurance premiums 280 Other assets 865 Unpaid losses and loss expenses (22,906 ) Unearned premiums (7,033 ) Insurance and reinsurance balances payable (511 ) Accounts payable, accrued expenses, and other liabilities (1,935 ) Deferred tax liabilities (1,335 ) Long-term debt (3,765 ) Total identifiable net assets acquired 19,316 Goodwill 10,530 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 $ 115 million and $ 361 million for the three and nine months ended September 30, 2016 , respectively, and include all internal and external costs directly related to the integration activities of the Chubb Corp acquisition, consisting primarily of personnel-related expenses, including severance and employee retention and relocation; consulting fees; and advisor fees. Chubb integration expenses were $ 9 million for both the three and nine months ended September 30, 2015, consisting primarily of consulting and legal fees. We recognized goodwill of $ 10.5 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 finite lived 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 operations: (in millions of U.S. dollars) Three Months Ended September 30, 2016 January 14, 2016 to September 30, 2016 Total revenues $ 2,656 $ 7,888 Net income $ 483 $ 1,064 The following table provides supplemental unaudited pro forma consolidated information for the three and nine months ended September 30, 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 Nine Months Ended September 30 September 30 (in millions of U.S. dollars, except per share data) 2016 2015 2016 2015 Total revenues $ 8,521 $ 8,314 $ 23,758 $ 24,387 Net income $ 1,345 $ 1,036 $ 2,591 $ 3,194 Earnings per share Basic earnings per share $ 2.87 $ 2.23 $ 5.54 $ 6.85 Diluted earnings per share $ 2.85 $ 2.21 $ 5.50 $ 6.78 Total revenues and net income were higher for the three months ended September 30, 2016 , compared to the prior year, principally driven by net realized gains in the current year compared to net realized losses last year, primarily in our variable annuity reinsurance business. This increase was partially offset by merger-related underwriting actions in the current year, including the purchase of additional reinsurance, which lowered net premiums earned. Total revenues and net income were lower for the nine months ended September 30, 2016 , compared to the prior year, primarily reflecting the merger-related underwriting actions in the current year, as noted above, as well as higher net realized losses in the current year, primarily in our variable annuity reinsurance business. 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 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	9 Months Ended
	Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Investments	Investments a) Fixed maturities September 30, 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 $ 2,626 $ 84 $ (2 ) $ 2,708 $ — Foreign 21,499 1,057 (48 ) 22,508 (9 ) Corporate securities 22,860 977 (64 ) 23,773 (9 ) Mortgage-backed securities 13,083 383 (5 ) 13,461 (1 ) States, municipalities, and political subdivisions 18,562 357 (11 ) 18,908 — $ 78,630 $ 2,858 $ (130 ) $ 81,358 $ (19 ) Held to maturity U.S. Treasury and agency $ 709 $ 26 $ — $ 735 $ — Foreign 694 45 — 739 — Corporate securities 2,852 131 (2 ) 2,981 — Mortgage-backed securities 1,507 72 — 1,579 — States, municipalities, and political subdivisions 5,165 167 — 5,332 — $ 10,927 $ 441 $ (2 ) $ 11,366 $ — 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 and nine months ended September 30, 2016 , $ 13 million and $ 57 million , respectively, of net unrealized appreciation related to such securities is included in OCI. For the three and nine months ended September 30, 2015 , $4 million and nil , respectively, of net unrealized depreciation related to such securities is included in OCI. At September 30, 2016 , AOCI included cumulative net unrealized appreciation of $7 million related to securities remaining in the investment portfolio for which a non-credit OTTI was recognized. At December 31, 2015 , AOCI included cumulative net unrealized depreciation of $35 million 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 81 percent of the total mortgage-backed securities at both September 30, 2016 and December 31, 2015 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: September 30 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 $ 3,402 $ 3,413 $ 1,856 $ 1,865 Due after 1 year through 5 years 25,152 25,865 14,936 15,104 Due after 5 years through 10 years 26,702 27,645 12,258 12,173 Due after 10 years 10,291 10,974 4,272 4,487 65,547 67,897 33,322 33,629 Mortgage-backed securities 13,083 13,461 9,827 9,958 $ 78,630 $ 81,358 $ 43,149 $ 43,587 Held to maturity Due in 1 year or less $ 458 $ 462 $ 492 $ 495 Due after 1 year through 5 years 2,716 2,807 2,443 2,517 Due after 5 years through 10 years 2,815 2,919 2,292 2,313 Due after 10 years 3,431 3,599 1,496 1,484 9,420 9,787 6,723 6,809 Mortgage-backed securities 1,507 1,579 1,707 1,743 $ 10,927 $ 11,366 $ 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 September 30 December 31 (in millions of U.S. dollars) 2016 2015 Cost $ 695 $ 441 Gross unrealized appreciation 122 74 Gross unrealized depreciation (14 ) (18 ) Fair value $ 803 $ 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 and nine months ended September 30, 2016 , credit losses recognized in Net income for corporate securities were $4 million and $ 28 million , respectively. For the three and nine months ended September 30, 2015 , credit losses recognized in Net income for corporate securities were $14 million and $ 23 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 and nine months ended September 30, 2016 , there were $1 million in credit losses recognized in Net income for mortgage-backed securities. For the three and nine months ended September 30, 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 Nine Months Ended September 30 September 30 (in millions of U.S. dollars) 2016 2015 2016 2015 Fixed maturities: OTTI on fixed maturities, gross $ (7 ) $ (31 ) $ (85 ) $ (57 ) OTTI on fixed maturities recognized in OCI (pre-tax) — 5 8 11 OTTI on fixed maturities, net (7 ) (26 ) (77 ) (46 ) Gross realized gains excluding OTTI 47 19 149 91 Gross realized losses excluding OTTI (13 ) (44 ) (228 ) (95 ) Total fixed maturities 27 (51 ) (156 ) (50 ) Equity securities: OTTI on equity securities (1 ) (3 ) (7 ) (4 ) Gross realized gains excluding OTTI 19 10 63 43 Gross realized losses excluding OTTI (12 ) (5 ) (17 ) (7 ) Total equity securities 6 2 39 32 OTTI on other investments (4 ) (1 ) (7 ) (1 ) Foreign exchange gains (losses) 29 (2 ) 46 (73 ) Investment and embedded derivative instruments 1 (22 ) (85 ) 6 Fair value adjustments on insurance derivative 89 (396 ) (270 ) (337 ) S&P put options and futures (45 ) 83 (88 ) 69 Other derivative instruments 3 (9 ) 1 (10 ) Other (6 ) (1 ) 10 4 Net realized gains (losses) $ 100 $ (397 ) $ (510 ) $ (360 ) 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 Nine Months Ended September 30 September 30 (in millions of U.S. dollars) 2016 2015 2016 2015 Balance of credit losses related to securities still held – beginning of period $ 51 $ 23 $ 53 $ 28 Additions where no OTTI was previously recorded 4 8 16 15 Additions where an OTTI was previously recorded 1 6 13 8 Reductions for securities sold during the period (11 ) (5 ) (37 ) (19 ) Balance of credit losses related to securities still held – end of period $ 45 $ 32 $ 45 $ 32 d) Gross unrealized loss At September 30, 2016 , there were 3,376 fixed maturities out of a total of 31,902 fixed maturities in an unrealized loss position. The largest single unrealized loss in the fixed maturities was $2 million . There were 73 equity securities out of a total of 326 equity securities in an unrealized loss position. The largest single unrealized loss in the equity securities was $3 million . Fixed maturities in an unrealized loss position at September 30, 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 September 30, 2016 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 $ 436 $ (2 ) $ — $ — $ 436 $ (2 ) Foreign 1,899 (20 ) 409 (28 ) 2,308 (48 ) Corporate securities 1,559 (21 ) 750 (45 ) 2,309 (66 ) Mortgage-backed securities 1,039 (3 ) 292 (2 ) 1,331 (5 ) States, municipalities, and political subdivisions 2,807 (10 ) 50 (1 ) 2,857 (11 ) Total fixed maturities 7,740 (56 ) 1,501 (76 ) 9,241 (132 ) Equity securities 133 (14 ) — — 133 (14 ) Other investments 233 (27 ) — — 233 (27 ) Total $ 8,106 $ (97 ) $ 1,501 $ (76 ) $ 9,607 $ (173 ) 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 September 30, 2016 and December 31, 2015 , are investments, primarily fixed maturities, totaling $19.4 billion and $16.9 billion, respectively, and cash of $162 million and $110 million, respectively. The following table presents the components of restricted assets: September 30 December 31 (in millions of U.S. dollars) 2016 2015 Trust funds $ 13,093 $ 11,862 Deposits with non-U.S. regulatory authorities 2,338 2,075 Deposits with U.S. regulatory authorities 2,232 1,242 Assets pledged under repurchase agreements 1,464 1,459 Other pledged assets 433 392 $ 19,560 $ 17,030

Fair value measurements

Fair value measurements	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair value measurements	Fair value measurements 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 September 30, 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 and nine months ended September 30, 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 September 30, 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 $ 2,155 $ 553 $ — $ 2,708 Foreign — 22,405 103 22,508 Corporate securities — 23,167 606 23,773 Mortgage-backed securities — 13,415 46 13,461 States, municipalities, and political subdivisions — 18,908 — 18,908 2,155 78,448 755 81,358 Equity securities 766 — 37 803 Short-term investments 2,127 1,359 62 3,548 Other investments (1) 404 250 223 877 Securities lending collateral — 1,140 — 1,140 Investment derivative instruments 20 — — 20 Other derivative instruments 14 — — 14 Separate account assets 1,743 97 — 1,840 Total assets measured at fair value (1) $ 7,229 $ 81,294 $ 1,077 $ 89,600 Liabilities: Investment derivative instruments $ 34 $ — $ — $ 34 Other derivative instruments — — 8 8 GLB (2) — — 883 883 Total liabilities measured at fair value $ 34 $ — $ 891 $ 925 (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $ 3,498 million and other investments of $ 25 million at September 30, 2016 measured using NAV as a practical expedient. (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 as a practical expedient. (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 and nine months ended September 30, 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: September 30 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 $ 549 $ 188 $ 300 $ 105 Real Assets 3 to 7 Years 520 274 474 140 Distressed 5 to 9 Years 463 196 261 218 Private Credit 3 to 7 Years 241 294 265 209 Traditional 3 to 9 Years 1,458 999 895 152 Vintage 1 to 2 Years 23 14 13 — Investment funds Not Applicable 244 — 269 — $ 3,498 $ 1,965 $ 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 September 30, 2016 December 31, 2015 GLB (1) $ 883 $ 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 Short-term investments Other investments Other derivative instruments GLB (1) September 30, 2016 Foreign Corporate securities MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 87 $ 281 $ 49 $ 37 $ 50 $ 216 $ 10 $ 971 Transfers into Level 3 — — — — — — — — Change in Net Unrealized Gains (Losses) included in OCI (1 ) 6 — 3 — 4 — — Net Realized Gains/Losses — (4 ) — — — — — (88 ) Purchases 20 348 — — 12 8 — — Sales (2 ) (18 ) (3 ) (3 ) — — — — Settlements (1 ) (7 ) — — — (5 ) (2 ) — Balance–End of Period $ 103 $ 606 $ 46 $ 37 $ 62 $ 223 $ 8 $ 883 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ (4 ) $ — $ — $ — $ — $ — $ (88 ) (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. Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity Other Other derivative instruments GLB (1) September 30, 2015 Foreign Corporate MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 56 $ 167 $ 55 $ 2 $ 214 $ 3 $ 347 Transfers into Level 3 1 2 — — — — — Change in Net Unrealized Gains (Losses) included in OCI 1 1 — 2 (7 ) — — Net Realized Gains/Losses (1 ) (1 ) — (1 ) — 4 397 Purchases — 22 — 1 5 — — Sales — (5 ) (1 ) — — — — Settlements (4 ) (3 ) — — (3 ) — — Balance–End of Period $ 53 $ 183 $ 54 $ 4 $ 209 $ 7 $ 744 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (1 ) $ — $ — $ (1 ) $ — $ 4 $ 397 (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 $1.0 billion at September 30, 2015 , and $615 million at June 30, 2015, which includes a fair value derivative adjustment of $744 million and $347 million, respectively. Assets Liabilities Nine Months Ended Available-for-Sale Debt Securities Equity Short-term investments Other Other GLB (1) September 30, 2016 Foreign Corporate MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 57 $ 174 $ 53 $ 16 $ — $ 212 $ 6 $ 609 Transfers into Level 3 9 18 — — — — — — Transfers out of Level 3 (2 ) — — — — — — — Change in Net Unrealized Gains (Losses) included in OCI 8 17 — 2 — 4 — — Net Realized Gains/Losses (6 ) (12 ) — 1 — — 2 274 Purchases (2) 52 472 1 23 62 22 2 — Sales (10 ) (48 ) (8 ) (5 ) — — — — Settlements (5 ) (15 ) — — — (15 ) (2 ) — Balance–End of Period $ 103 $ 606 $ 46 $ 37 $ 62 $ 223 $ 8 $ 883 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (5 ) $ (11 ) $ — $ — $ — $ — $ 2 $ 274 (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 Nine Months Ended Available-for-Sale Debt Securities Other investments Other GLB (1) September 30, 2015 Foreign Corporate MBS Equity (in millions of U.S. dollars) Balance–Beginning of Period $ 22 $ 187 $ 15 $ 2 $ 204 $ 4 $ 406 Transfers into Level 3 29 15 — — — — — Change in Net Unrealized Gains (Losses) included in OCI (1 ) 1 — 2 (7 ) — — Net Realized Gains/Losses (1 ) (4 ) — (2 ) — 3 338 Purchases 9 38 41 2 21 — — Sales (1 ) (10 ) (1 ) — — — — Settlements (4 ) (44 ) (1 ) — (9 ) — — Balance–End of Period $ 53 $ 183 $ 54 $ 4 $ 209 $ 7 $ 744 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (1 ) $ (2 ) $ — $ (2 ) $ — $ 3 $ 338 (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 $1.0 billion at September 30, 2015 , and $ 663 million at December 31, 2014, which includes a fair value derivative adjustment of $744 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: September 30, 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 $ 628 $ 107 $ — $ 735 $ 709 Foreign — 739 — 739 694 Corporate securities — 2,968 13 2,981 2,852 Mortgage-backed securities — 1,579 — 1,579 1,507 States, municipalities, and political subdivisions — 5,332 — 5,332 5,165 Total assets $ 628 $ 10,725 $ 13 $ 11,366 $ 10,927 Liabilities: Repurchase agreements $ — $ 1,406 $ — $ 1,406 $ 1,406 Short-term debt — 508 — 508 500 Long-term debt — 13,762 — 13,762 12,621 Trust preferred securities — 463 — 463 308 Total liabilities $ — $ 16,139 $ — $ 16,139 $ 14,835 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	9 Months Ended
	Sep. 30, 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 Nine Months Ended September 30 September 30 (in millions of U.S. dollars) 2016 2015 2016 2015 GMDB Net premiums earned $ 15 $ 15 $ 42 $ 47 Policy benefits and other reserve adjustments $ 11 $ 5 $ 34 $ 25 GLB Net premiums earned $ 28 $ 30 $ 88 $ 92 Policy benefits and other reserve adjustments 9 15 24 34 Net realized gains (losses) 86 (397 ) (285 ) (338 ) Loss recognized in Net income $ 105 $ (382 ) $ (221 ) $ (280 ) Less: Net cash received 15 20 57 74 Net (increase) decrease in liability $ 90 $ (402 ) $ (278 ) $ (354 ) 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 $119 million and $ 117 million at September 30, 2016 and December 31, 2015 , respectively. At September 30, 2016 and December 31, 2015 , the reported liability for GLB reinsurance was $1.2 billion and $888 million, respectively, which includes a fair value derivative adjustment of $ 883 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	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets [Text Block]	Goodwill and Other intangible assets At September 30, 2016 and December 31, 2015, Goodwill was $ 15.5 billion and $ 4.8 billion , respectively, and Other intangible assets were $ 7.0 billion and $ 887 million , respectively. The increases in Goodwill and Other intangible assets reflect the goodwill and intangible assets recorded in connection with the Chubb Corp acquisition. The following table presents a roll-forward of Goodwill by segment for the nine months ended September 30, 2016 : (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 5,711 2,025 — 2,794 — — 10,530 Foreign exchange revaluation 43 13 — 98 — 1 155 Balance at September 30, 2016 $ 6,957 $ 2,234 $ 134 $ 4,970 $ 365 $ 821 $ 15,481 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) Preliminary purchase price allocation 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 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 September 30, 2016 , the expected estimated pre-tax amortization expense (benefit), at current foreign currency exchange rates, for the fourth quarter of 2016 and the next five years, related to purchased intangibles as well as the fair value adjustment to Unpaid losses and loss expenses 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 expenses Total Other intangible assets Total Amortization of purchased intangibles Fourth quarter of 2016 $ 33 $ 8 $ (61 ) $ (20 ) $ 23 $ 3 2017 296 32 (161 ) 167 85 252 2018 324 32 (102 ) 254 73 327 2019 281 — (62 ) 219 66 285 2020 240 — (36 ) 204 59 263 2021 217 — (20 ) 197 53 250 Total $ 1,391 $ 72 $ (442 ) $ 1,021 $ 359 $ 1,380 The expected amortization, at current foreign currency exchange rates, for the remainder of the UPR intangible asset which amortizes through Policy acquisition costs on the Consolidated statements of operations is $ 144 million for the fourth quarter of 2016.

Debt

Debt	9 Months Ended
	Sep. 30, 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 at the acquisition date. Chubb INA Holdings Inc. (Chubb INA) assumed Chubb Corp's rights, duties and obligations and Chubb Limited fully and unconditionally guarantees Chubb INA'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. September 30 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) $ 1,406 $ 1,404 None Short-term debt Chubb INA senior notes: $500 million 5.7% due February 2017 $ 500 $ — Make-whole premium plus 0.20% 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 300 299 Make-whole premium plus 0.35% $600 million 5.75% due May 2018 641 — Make-whole premium plus 0.30% $100 million 6.6% due August 2018 109 — None $500 million 5.9% due June 2019 498 497 Make-whole premium plus 0.40% $1,300 million 2.3% due November 2020 1,294 1,294 Make-whole premium plus 0.15% $1,000 million 2.875% due November 2022 994 994 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 1,488 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 258 — 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 982 — Make-whole premium plus 0.20% $600 million 6.5% due May 2038 778 — 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 (1) 961 — 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 $ 12,621 $ 9,389 Trust preferred securities Chubb INA capital securities due April 2030 $ 308 $ 307 Redemption prices (2) (1) 6.375% interest rate through April 14, 2017; interest rate equal to three month LIBOR rate plus 2.25% thereafter. (2) 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. Certain of Chubb INA's senior notes and capital securities 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 and capital securities are also redeemable at par plus accrued and unpaid interest in the event of certain changes in tax law. We have outstanding $ 1.0 billion of unsecured junior subordinated capital securities at September 30, 2016 , which were assumed by Chubb INA 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 scheduled 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 $ 1.0 billion capital securities may be redeemed, in whole or in part, at any time (i) on or after April 15, 2017 at a redemption price equal to the principal amount plus any accrued interest or (ii) prior to April 15, 2017 at a redemption price equal to the greater of (1) the principal amount or (2) a make-whole premium, in each case plus any accrued interest.

Commitments, contingencies, and

Commitments, contingencies, and guarantees	9 Months Ended
	Sep. 30, 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 September 30, 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: September 30, 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) $ 10 $ (32 ) $ 2,025 $ 7 $ (11 ) $ 1,029 Cross-currency swaps OA / (AP) — — 95 — — 95 Options/Futures contracts on bonds and equities OA / (AP) 10 (2 ) 1,353 5 (2 ) 751 Convertible securities (1) FM AFS / ES 5 — 8 31 — 40 $ 25 $ (34 ) $ 3,481 $ 43 $ (13 ) $ 1,915 Other derivative instruments Futures contracts on equities (2) OA / (AP) $ 4 $ — $ 1,275 $ — $ (4 ) $ 1,197 Other OA / (AP) 10 (8 ) 243 — (6 ) 15 $ 14 $ (8 ) $ 1,518 $ — $ (10 ) $ 1,212 GLB (3) (AP) / (FPB) $ — $ (1,166 ) $ 1,436 $ — $ (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 September 30, 2016 and December 31, 2015, derivative assets of $9 million and $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 September 30, 2016 and December 31, 2015, our securities lending collateral was $1,140 million and $1,046 million, respectively, and our securities lending payable, reflecting our obligation to return the collateral plus interest, was $1,141 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 September 30, 2016 Overnight and Continuous (in millions of U.S. dollars) Collateral held under securities lending agreements: Cash $ 449 U.S. Treasury and agency 53 Foreign 324 Corporate securities 4 Mortgage-backed securities 38 Equity securities 272 $ 1,140 Gross amount of recognized liability for securities lending payable $ 1,141 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 September 30, 2016 and December 31, 2015, our repurchase agreement obligations of $1,406 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 September 30, 2016 Up to 30 Days 30 - 90 Days Greater than 90 Days Total (in millions of U.S. dollars) Collateral pledged under repurchase agreements: U.S. Treasury and agency $ 5 $ — $ 232 $ 237 Mortgage-backed securities 408 484 335 1,227 $ 413 $ 484 $ 567 $ 1,464 Gross amount of recognized liabilities for repurchase agreements $ 1,406 Difference (1) $ 58 (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 Nine Months Ended September 30 September 30 (in millions of U.S. dollars) 2016 2015 2016 2015 Investment and embedded derivative instruments Foreign currency forward contracts $ (10 ) $ 15 $ (30 ) $ 30 All other futures contracts and options 8 (23 ) (63 ) (10 ) Convertible securities (1) 3 (14 ) 8 (14 ) Total investment and embedded derivative instruments $ 1 $ (22 ) $ (85 ) $ 6 GLB and other derivative instruments GLB (2) $ 89 $ (396 ) $ (270 ) $ (337 ) Futures contracts on equities (3) (45 ) 84 (88 ) 71 Options on equity market indices (3) — (1 ) — (2 ) Other 3 (9 ) 1 (10 ) Total GLB and other derivative instruments $ 47 $ (322 ) $ (357 ) $ (278 ) $ 48 $ (344 ) $ (442 ) $ (272 ) (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 September 30, 2016 , we have commitments to purchase fixed income securities of $788 million over the next several years. e) Other investments At September 30, 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 $3.3 billion. In connection with these investments, we have commitments that may require funding of up to $2.0 billion over the next several years. f) Taxation In September, the IRS completed its examination of one of our subsidiary’s federal tax returns for the 2010-2012 tax years. No material adjustments resulted from this examination. At September 30, 2016 , $17 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 2006. 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	9 Months Ended
	Sep. 30, 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 September 30, 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. At our May 2016 annual general meeting, our shareholders approved an annual dividend for the following year of up to $ 2.76 per share, expected to be paid in four quarterly installments of $ 0.69 per share after the annual general meeting by way of distribution from capital contribution reserves, transferred to free reserves for payment. The Board will determine the record and payment dates at which the annual dividend may be paid until the date of the 2017 annual general meeting, and is authorized to abstain from distributing a dividend at their discretion. The following table presents dividend distributions per Common Share in Swiss francs (CHF) and U.S. dollars (USD): Three Months Ended Nine Months Ended September 30 September 30 2016 2015 2016 2015 CHF USD CHF USD CHF USD CHF USD Dividends – par value reduction — $ — — $ — — $ — 0.62 $ 0.65 Dividends – distributed from capital contribution reserves 0.67 0.69 0.65 0.67 2.01 2.05 1.27 1.34 Total dividend distributions per common share 0.67 $ 0.69 0.65 $ 0.67 2.01 $ 2.05 1.89 $ 1.99 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 September 30, 2016 , 14,497,754 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 authorized a share repurchase program of $1.5 billion of Chubb's Common Shares for the period January 1, 2015 through December 31, 2015 . For the three and nine months ended September 30, 2015, Chubb repurchased nil and $734 million ( 6,677,663 Common Shares), respectively. There are no outstanding repurchase authorizations subsequent to December 31, 2015.

Share-based compensation

Share-based compensation	9 Months Ended
	Sep. 30, 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) permitted 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 permitted 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 stock 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. In May 2016, our shareholders approved the Chubb Limited 2016 Long-Term Incentive Plan (the 2016 LTIP), which replaced both the 2004 LTIP and The Chubb Corporation Long-Term Incentive Plan (2014). The 2016 LTIP is substantially similar to the 2004 LTIP in its operation and the types of awards that may be granted. Under the 2016 LTIP, 19,500,000 Common Shares were authorized to be issued, in addition to any shares that have not been delivered pursuant to the 2004 LTIP and remain available for grant pursuant to the 2004 LTIP, including any shares covered by awards granted under the 2004 LTIP that are forfeited, expire, or are canceled after the effective date of the 2016 LTIP without delivery of shares or which result in the forfeiture of the shares back to Chubb.

Postretirement benefits Postret

Postretirement benefits Postretirement benefits	9 Months Ended
	Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Compensation and Employee Benefit Plans [Text Block]	Postretirement benefits We maintain non-contributory defined benefit pension 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 postretirement 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 legacy Chubb Corp, which consisted of several non-contributory defined benefit pension plans covering substantially all its employees. We also assumed 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 legacy Chubb Corp to the accounting policies of Chubb, including selecting 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 January 14, 2016 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 obligations (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 and nine months ended September 30, 2016 , we contributed $ 24 million and $ 156 million , respectively, to our U.S. and non-U.S. pension and other postretirement benefits plans. At September 30, 2016 , we estimate that we will contribute an additional $ 8 million for the remainder of 2016. These estimates are subject to change due to contribution decisions that are affected by various factors including our liquidity, market performance and management discretion. The following tables summarize the components of net periodic benefit costs for our pension and postretirement benefit plans recognized in the Consolidated statements of operations: Three Months Ended September 30 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 2016 Net periodic benefit cost: Service cost $ 20 $ 6 $ 26 $ 4 $ — $ 4 Interest cost 26 8 34 4 — 4 Expected return on plan assets (42 ) (10 ) (52 ) (3 ) — (3 ) Amortization of net actuarial loss — — — — — — Curtailments (4 ) — (4 ) — — — Settlements (1 ) — (1 ) — — — Net periodic benefit cost $ (1 ) $ 4 $ 3 $ 5 $ — $ 5 2015 Net periodic benefit cost: Service cost $ — $ 2 $ 2 Interest cost — 5 5 Expected return on plan assets — (7 ) (7 ) Amortization of net actuarial loss — — — Net periodic benefit cost $ — $ — $ — Nine Months Ended September 30 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 2016 Net periodic benefit cost: Service cost $ 57 $ 15 $ 72 $ 8 $ 1 $ 9 Interest cost 80 24 104 13 — 13 Expected return on plan assets (121 ) (30 ) (151 ) (7 ) — (7 ) Amortization of net actuarial loss — 2 2 — — — Curtailments (4 ) — (4 ) — — — Settlements (1 ) — (1 ) — — — Net periodic benefit cost $ 11 $ 11 $ 22 $ 14 $ 1 $ 15 2015 Net periodic benefit cost: Service cost $ — $ 5 $ 5 Interest cost — 15 15 Expected return on plan assets — (21 ) (21 ) Amortization of net actuarial loss — 2 2 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 September 30, 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 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	9 Months Ended
	Sep. 30, 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 other run-off 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. This segment includes our North American Major Accounts and Specialty Insurance (principally large corporate accounts and wholesale business), and the Commercial Insurance divisions (principally middle market and small commercial accounts). • The North America Personal P&C Insurance segment includes the business written by Chubb’s North America Personal Risk Services division, which comprises Chubb high net worth personal lines business and ACE Private Risk Services, with operations in U.S. and Canada. This segment 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 includes the business written by Rain and Hail Insurance 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 Corp run-off Reinsurance business. • The Life Insurance segment includes the business written by Chubb Life, Chubb Tempest Life Re and Combined Insurance’s North America operations. 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, legacy Chubb Corp run-off business in 2016, and certain other run-off exposures. In addition, revenue and expenses managed at the corporate level, including realized gains and losses, interest expense, the non-operating income of our partially-owned entities, and income taxes are reported within Corporate. Chubb integration expenses and other merger-related expenses (both included in Chubb integration expenses in the consolidated statements of operations) are also reported within Corporate. Chubb integration expenses are one-time costs that are directly attributable to the achievement of the annualized savings, including employee severance, third-party consulting fees, and systems integration expenses. Other merger-related expenses are one-time costs directly attributable to the merger, including rebranding, employee retention costs and other professional and legal fees related to the Chubb Corp acquisition. These items will not be allocated to the segment level as they are one-time in nature and are not related to the ongoing business activities of the segment. 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. Therefore, the segment income statement will only include underwriting income, net investment income, and other operating income and expense items such as each segment's share of the operating income (loss) related to partially-owned entities and miscellaneous income and expense items for which the segments are held accountable. Beginning with the third quarter of 2016, segment income also included amortization of purchased intangibles related to business combination intangible assets acquired by the segment and other purchase accounting related intangible assets, including agency relationships, renewal rights, and client lists. These costs were previously included in Corporate. The amortization of intangible assets purchased as part of the Chubb Corp acquisition is considered a Corporate cost as these are incurred by the overall company. We determined that this definition of segment income is appropriate and aligns with how the business is managed. The prior periods have been adjusted to conform to the new segment presentation. As we progress through the integration and refine our processes, we may continue to further refine our segments and segment income measures. 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, the operating portion of other (income) expense, and amortization of purchased intangibles. For the North America Agricultural Insurance segment, management includes gains and losses on crop derivatives as a component of underwriting income. For example, for the three months ended September 30, 2016, underwriting income in our North America Agricultural Insurance segment was $90 million . This amount includes $3 million of realized gains related to crop derivatives which are reported in Net realized gains (losses) in the Corporate column below. For the Life Insurance segment, management includes Net investment income and (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 underwriting income. For example, for the three months ended September 30, 2016, Life underwriting income of $72 million includes Net investment income of $71 million and gains from fair value changes in separate account assets of $22 million . The gains from fair value changes in separate account assets are reported in other (income) expense in the table below. The following tables present the Statement of Operations by segment: 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 For the Three Months Ended September 30, 2016 (in millions of U.S. dollars) Net premiums written $ 3,110 $ 1,011 $ 849 $ 1,940 $ 131 $ 532 $ — $ 7,573 Net premiums earned 3,086 1,081 819 2,034 156 512 — 7,688 Losses and loss expenses 1,863 594 683 843 49 174 63 4,269 Policy benefits — — — — — 155 — 155 Policy acquisition costs 522 229 48 546 42 127 — 1,514 Administrative expenses 275 89 1 261 12 77 57 772 Underwriting income (loss) 426 169 87 384 53 (21 ) (120 ) 978 Net investment income (loss) 477 53 5 152 67 71 (86 ) 739 Other (income) expense 3 2 — (6 ) — (20 ) (70 ) (91 ) Amortization expense (benefit) of purchased intangibles — 4 7 12 — 1 (20 ) 4 Segment income (loss) 900 216 85 530 120 69 (116 ) 1,804 Net realized gains including OTTI 100 100 Interest expense 152 152 Chubb integration expenses 115 115 Income tax expense 277 277 Net income (loss) $ (560 ) $ 1,360 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 For the Three Months Ended September 30, 2015 (in millions of U.S. dollars) Net premiums written $ 1,433 $ 278 $ 737 $ 1,584 $ 185 $ 492 $ — $ 4,709 Net premiums earned 1,410 272 739 1,615 203 480 — 4,719 Losses and loss expenses 913 179 620 674 20 153 84 2,643 Policy benefits — — — — — 89 — 89 Policy acquisition costs 142 13 42 405 52 117 — 771 Administrative expenses 154 36 — 246 12 74 46 568 Underwriting income (loss) 201 44 77 290 119 47 (130 ) 648 Net investment income 260 7 5 132 76 66 3 549 Other (income) expense (3 ) 1 (1 ) (6 ) (4 ) 48 (23 ) 12 Amortization of purchased intangibles — 31 8 12 — — — 51 Segment income (loss) 464 19 75 416 199 65 (104 ) 1,134 Net realized gains (losses) including OTTI (397 ) (397 ) Interest expense 68 68 Chubb integration expenses 9 9 Income tax expense 132 132 Net income (loss) $ (710 ) $ 528 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 For the Nine Months Ended September 30, 2016 (in millions of U.S. dollars) Net premiums written $ 8,657 $ 3,113 $ 1,288 $ 6,012 $ 562 $ 1,575 $ — $ 21,207 Net premiums earned 9,130 3,245 1,169 6,082 543 1,521 — 21,690 Losses and loss expenses 5,581 1,916 937 2,953 225 498 87 12,197 Policy benefits — — — — — 427 — 427 Policy acquisition costs 1,549 747 77 1,586 142 386 — 4,487 Administrative expenses 840 275 (1 ) 801 40 226 192 2,373 Underwriting income (loss) 1,160 307 156 742 136 (16 ) (279 ) 2,206 Net investment income (loss) 1,371 155 15 445 199 207 (271 ) 2,121 Other (income) expense (6 ) 6 — (16 ) (3 ) (14 ) (59 ) (92 ) Amortization expense (benefit) of purchased intangibles — 16 22 36 — 2 (60 ) 16 Segment income (loss) 2,537 440 149 1,167 338 203 (431 ) 4,403 Net realized gains (losses) including OTTI (510 ) (510 ) Interest expense 451 451 Chubb integration expenses 361 361 Income tax expense 556 556 Net income (loss) $ (2,309 ) $ 2,525 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 For the Nine Months Ended September 30, 2015 (in millions of U.S. dollars) Net premiums written $ 4,158 $ 958 $ 1,204 $ 5,047 $ 719 $ 1,483 $ — $ 13,569 Net premiums earned 4,209 687 1,124 4,896 649 1,441 — 13,006 Losses and loss expenses 2,744 446 913 2,304 191 442 142 7,182 Policy benefits — — — — — 384 — 384 Policy acquisition costs 403 43 61 1,190 166 342 — 2,205 Administrative expenses 459 89 3 756 37 221 135 1,700 Underwriting income (loss) 603 109 147 646 255 52 (277 ) 1,535 Net investment income 780 19 17 409 230 198 9 1,662 Other (income) expense (5 ) 1 1 (12 ) (5 ) 32 (73 ) (61 ) Amortization of purchased intangibles — 63 22 50 — 1 — 136 Segment income (loss) 1,388 64 141 1,017 490 217 (195 ) 3,122 Net realized gains (losses) including OTTI (360 ) (360 ) Interest expense 207 207 Chubb integration expenses 9 9 Income tax expense 395 395 Net income (loss) $ (1,166 ) $ 2,151 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	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Earnings per share	Earnings per share Three Months Ended Nine Months Ended September 30 September 30 (in millions of U.S. dollars, except share and per share data) 2016 2015 2016 2015 Numerator: Net income $ 1,360 $ 528 $ 2,525 $ 2,151 Denominator: Denominator for basic earnings per share: Weighted-average shares outstanding 468,021,093 324,210,936 460,631,794 325,904,502 Denominator for diluted earnings per share: Share-based compensation plans 3,375,269 2,962,484 3,439,017 3,269,724 Weighted-average shares outstanding and assumed conversions 471,396,362 327,173,420 464,070,811 329,174,226 Basic earnings per share $ 2.90 $ 1.63 $ 5.48 $ 6.60 Diluted earnings per share $ 2.88 $ 1.62 $ 5.44 $ 6.53 Potential anti-dilutive share conversions 1,306,710 1,907,815 1,635,337 1,503,830 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	9 Months Ended
	Sep. 30, 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 at the acquisition date. 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 September 30, 2016 and December 31, 2015 , and for the three and nine months ended September 30, 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 September 30, 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 $ 25 $ 812 $ 100,199 $ — $ 101,036 Cash (1) 6 2 2,158 (1,296 ) 870 Insurance and reinsurance balances receivable — — 11,392 (2,899 ) 8,493 Reinsurance recoverable on losses and loss expenses — — 23,642 (10,194 ) 13,448 Reinsurance recoverable on policy benefits — — 1,167 (972 ) 195 Value of business acquired — — 368 — 368 Goodwill and other intangible assets — — 22,472 — 22,472 Investments in subsidiaries 38,403 50,316 — (88,719 ) — Due from subsidiaries and affiliates, net 11,186 — — (11,186 ) — Other assets 5 366 18,856 (4,299 ) 14,928 Total assets $ 49,625 $ 51,496 $ 180,254 $ (119,565 ) $ 161,810 Liabilities Unpaid losses and loss expenses $ — $ — $ 70,882 $ (9,535 ) $ 61,347 Unearned premiums — — 18,773 (3,719 ) 15,054 Future policy benefits — — 5,982 (972 ) 5,010 Due to subsidiaries and affiliates, net — 10,996 190 (11,186 ) — Affiliated notional cash pooling programs (1) 927 369 — (1,296 ) — Repurchase agreements — — 1,406 — 1,406 Short-term debt — 500 — — 500 Long-term debt — 12,610 11 — 12,621 Trust preferred securities — 308 — — 308 Other liabilities 326 1,588 19,416 (4,138 ) 17,192 Total liabilities 1,253 26,371 116,660 (30,846 ) 113,438 Total shareholders’ equity 48,372 25,125 63,594 (88,719 ) 48,372 Total liabilities and shareholders’ equity $ 49,625 $ 51,496 $ 180,254 $ (119,565 ) $ 161,810 (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 September 30, 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 September 30, 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 $ — $ — $ 7,573 $ — $ 7,573 Net premiums earned — — 7,688 — 7,688 Net investment income 1 2 736 — 739 Equity in earnings of subsidiaries 1,292 748 — (2,040 ) — Net realized gains (losses) including OTTI — (2 ) 102 — 100 Losses and loss expenses — — 4,269 — 4,269 Policy benefits — — 155 — 155 Policy acquisition costs and administrative expenses 15 12 2,259 — 2,286 Interest (income) expense (93 ) 233 12 — 152 Other (income) expense (7 ) 6 (90 ) — (91 ) Amortization of purchased intangibles — — 4 — 4 Chubb integration expenses 12 16 87 — 115 Income tax expense (benefit) 6 (136 ) 407 — 277 Net income $ 1,360 $ 617 $ 1,423 $ (2,040 ) $ 1,360 Comprehensive income $ 1,376 $ 627 $ 1,439 $ (2,066 ) $ 1,376 Condensed Consolidating Statements of Operations and Comprehensive Income For the Three Months Ended September 30, 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 $ — $ — $ 4,709 $ — $ 4,709 Net premiums earned — — 4,719 — 4,719 Net investment income 1 1 547 — 549 Equity in earnings of subsidiaries 488 255 — (743 ) — Net realized gains (losses) including OTTI — (4 ) (393 ) — (397 ) Losses and loss expenses — — 2,643 — 2,643 Policy benefits — — 89 — 89 Policy acquisition costs and administrative expenses 15 7 1,317 — 1,339 Interest (income) expense (8 ) 68 8 — 68 Other (income) expense (51 ) (5 ) 68 — 12 Amortization of purchased intangibles — — 51 — 51 Chubb integration expenses 1 8 — — 9 Income tax expense (benefit) 4 (31 ) 159 — 132 Net income $ 528 $ 205 $ 538 $ (743 ) $ 528 Comprehensive income (loss) $ (271 ) $ (265 ) $ (262 ) $ 527 $ (271 ) Condensed Consolidating Statements of Operations and Comprehensive Income Nine Months Ended September 30, 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 $ — $ — $ 21,207 $ — $ 21,207 Net premiums earned — — 21,690 — 21,690 Net investment income 3 9 2,109 — 2,121 Equity in earnings of subsidiaries 2,331 1,803 — (4,134 ) — Net realized gains (losses) including OTTI (1 ) (3 ) (506 ) — (510 ) Losses and loss expenses — — 12,197 — 12,197 Policy benefits — — 427 — 427 Policy acquisition costs and administrative expenses 48 144 6,668 — 6,860 Interest (income) expense (266 ) 681 36 — 451 Other (income) expense (20 ) 26 (98 ) — (92 ) Amortization of purchased intangibles — — 16 — 16 Chubb integration expenses 29 56 276 — 361 Income tax expense (benefit) 17 (323 ) 862 — 556 Net income $ 2,525 $ 1,225 $ 2,909 $ (4,134 ) $ 2,525 Comprehensive income $ 4,457 $ 2,687 $ 4,841 $ (7,528 ) $ 4,457 Condensed Consolidating Statements of Operations and Comprehensive Income Nine Months Ended September 30, 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 $ — $ — $ 13,569 $ — $ 13,569 Net premiums earned — — 13,006 — 13,006 Net investment income 2 2 1,658 — 1,662 Equity in earnings of subsidiaries 2,037 755 — (2,792 ) — Net realized gains (losses) including OTTI — (6 ) (354 ) — (360 ) Losses and loss expenses — — 7,182 — 7,182 Policy benefits — — 384 — 384 Policy acquisition costs and administrative expenses 47 20 3,838 — 3,905 Interest (income) expense (23 ) 206 24 — 207 Other (income) expense (149 ) (12 ) 100 — (61 ) Amortization of purchased intangibles — — 136 — 136 Chubb integration expenses 1 8 — — 9 Income tax expense (benefit) 12 (84 ) 467 — 395 Net income $ 2,151 $ 613 $ 2,179 $ (2,792 ) $ 2,151 Comprehensive income (loss) $ 768 $ (332 ) $ 795 $ (463 ) $ 768 Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 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 $ 3,399 $ 3,892 $ 3,918 $ (7,372 ) $ 3,837 Cash flows from investing activities Purchases of fixed maturities available for sale — (154 ) (23,683 ) — (23,837 ) Purchases of fixed maturities held to maturity — — (189 ) — (189 ) Purchases of equity securities — — (100 ) — (100 ) Sales of fixed maturities available for sale — 66 13,797 — 13,863 Sales of equity securities — — 963 — 963 Maturities and redemptions of fixed maturities available for sale — 59 6,877 — 6,936 Maturities and redemptions of fixed maturities held to maturity — — 627 — 627 Net change in short-term investments — 7,627 4,239 — 11,866 Net derivative instruments settlements — (10 ) (171 ) — (181 ) Acquisition of subsidiaries (net of cash acquired of $71) — (14,282 ) 34 — (14,248 ) Capital contribution (2,330 ) (20 ) (2,330 ) 4,680 — Other — (3 ) 29 — 26 Net cash flows (used for) from investing activities (2,330 ) (6,717 ) 93 4,680 (4,274 ) Cash flows from financing activities Dividends paid on Common Shares (851 ) — — — (851 ) Proceeds from issuance of repurchase agreements — — 1,457 — 1,457 Repayment of repurchase agreements — — (1,455 ) — (1,455 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 117 — 117 Dividend to parent company — — (7,372 ) 7,372 — Advances (to) from affiliates (258 ) 219 39 — — Capital contribution — 2,330 2,350 (4,680 ) — Net proceeds from (payments to) affiliated notional cash pooling programs (1) 45 280 — (325 ) — Policyholder contract deposits — — 473 — 473 Policyholder contract withdrawals — — (247 ) — (247 ) Other — (4 ) — — (4 ) Net cash flows (used for) from financing activities (1,064 ) 2,825 (4,638 ) 2,367 (510 ) Effect of foreign currency rate changes on cash and cash equivalents — — 42 — 42 Net increase (decrease) in cash 5 — (585 ) (325 ) (905 ) Cash – beginning of period (1) 1 2 2,743 (971 ) 1,775 Cash – end of period (1) $ 6 $ 2 $ 2,158 $ (1,296 ) $ 870 (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 September 30, 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 Nine Months Ended September 30, 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 (used for) operating activities $ 350 $ (46 ) $ 2,671 $ (276 ) $ 2,699 Cash flows from investing activities Purchases of fixed maturities available for sale — — (13,052 ) (8 ) (13,060 ) Purchases of fixed maturities held to maturity — — (39 ) — (39 ) Purchases of equity securities — — (122 ) — (122 ) Sales of fixed maturities available for sale — — 5,233 — 5,233 Sales of equity securities — — 150 — 150 Maturities and redemptions of fixed maturities available for sale — — 5,257 — 5,257 Maturities and redemptions of fixed maturities held to maturity — — 552 — 552 Net change in short-term investments — 215 206 — 421 Net derivative instruments settlements — (10 ) 72 — 62 Acquisition of subsidiaries (net of cash acquired of $620) — — 259 — 259 Capital contribution — (625 ) — 625 — Other — (25 ) (121 ) 8 (138 ) Net cash flows from (used for) investing activities — (445 ) (1,605 ) 625 (1,425 ) Cash flows from financing activities Dividends paid on Common Shares (644 ) — — — (644 ) Common Shares repurchased — — (758 ) — (758 ) Proceeds from issuance of long-term debt — 800 — — 800 Proceeds from issuance of repurchase agreements — — 1,478 — 1,478 Repayment of long-term debt — (450 ) (1 ) — (451 ) Repayment of repurchase agreements — — (1,477 ) — (1,477 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 89 — 89 Dividend to parent company — — (276 ) 276 — Advances (to) from affiliates (416 ) 272 144 — — Capital contribution — — 625 (625 ) — Net proceeds from (payments to) affiliated notional cash pooling programs (1) 727 (121 ) — (606 ) — Policyholder contract deposits — — 351 — 351 Policyholder contract withdrawals — — (159 ) — (159 ) Other — (6 ) — — (6 ) Net cash flows used for financing activities (333 ) 495 16 (955 ) (777 ) Effect of foreign currency rate changes on cash and cash equivalents — — (114 ) — (114 ) Net increase in cash 17 4 968 (606 ) 383 Cash – beginning of period (1) — 1 1,209 (555 ) 655 Cash – end of period (1) $ 17 $ 5 $ 2,177 $ (1,161 ) $ 1,038 (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 September 30, 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)	9 Months Ended
	Sep. 30, 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), 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 Chubb Corp. We have also redefined Corporate to include all run-off asbestos and environmental (A&E) exposures, the results of our run-off Brandywine business, the results of Westchester specialty operations for 1996 and prior years, and certain run-off 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 2016	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. Financial Instruments – Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, the FASB issued guidance that affects the recognition, measurement, presentation, and disclosure of financial instruments. The guidance requires equity investments to be measured at fair value with changes in fair value recognized through net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee) and an assessment of a valuation allowance on deferred tax assets related to unrealized losses of available for sale debt securities in combination with other deferred tax assets. The standard is effective for us in the first quarter of 2018. We are in the process of evaluating the effect the updated guidance will have on our financial condition and results of operations. Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued guidance on the accounting for credit losses of financial instruments that are measured at amortized cost, including held to maturity securities and reinsurance recoverables, by applying an approach based on the current expected credit losses (CECL). The estimate of expected credit losses should consider historical information, current information, as well as reasonable and supportable forecasts, including estimates of prepayments. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset in order to present the net carrying value at the amount expected to be collected on the financial asset on the Consolidated balance sheet. The guidance also amends the current available for sale (AFS) security other-than-temporary impairment model by requiring an estimate of the expected credit loss (ECL) only when the fair value is below the amortized cost of the asset. The length of time the fair value of an AFS debt security has been below the amortized cost will no longer impact the determination of whether a credit loss exists. The AFS debt security model will also require the use of a valuation allowance. The standard is effective for us in the first quarter of 2020 with early adoption permitted in the first quarter of 2019. We will be able to assess the effect of adopting this guidance on our financial condition and results of operations closer to the date of adoption. Stock Compensation In March 2016, the FASB issued guidance which requires recognition of the excess tax benefits or deficiencies of awards through net income rather than through additional paid in capital. Additionally, entities can elect to account for forfeitures related to share-based payments either as they occur or through an estimation method. If elected, the change to recognize forfeitures as they occur would be adopted using a modified retrospective approach, with a cumulative effect adjustment recorded to retained earnings. The updated guidance is effective for us in the first quarter of 2017 with early adoption permitted. Adoption of this guidance is not expected to have a material impact on our financial condition and results of operations. Statement of Cash Flows In August 2016, the FASB issued guidance clarifying the classification of certain cash receipts and cash payments within the statement of cash flows, including distributions received from equity method investments. The guidance requires entities to make an accounting policy election to present cash flows received either in operating cash flows or investing cash flows based on cumulative equity-method earnings or on the nature of the distributions. The updated guidance is effective for us in the first quarter of 2018 with early adoption permitted. The updated guidance should be applied retrospectively, unless it is impracticable to do so, at which point the guidance should be applied prospectively. We are in the process of evaluating the effect the updated guidance will have on our statements of cash flows.

Acquisitions Acquisitions (Tabl

Acquisitions Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2016
Acquisition [Abstract]
Schedule of Assets Acquired and Liabilities Assumed in the Chubb Corp Acquisition [Table Text Block]	The table below details the purchase consideration and preliminary allocation of assets acquired and liabilities assumed. During the second and third quarters of 2016, we reassessed certain components of our preliminary estimates of assets acquired and liabilities assumed, including the net realizable value for Reinsurance recoverables on losses and loss expenses and Insurance and reinsurance balances receivable and certain components of the Deferred tax liabilities, which resulted in an adjustment to our preliminary estimates that increased Goodwill by $85 million . These estimates remain preliminary and are subject to adjustment. 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 $ 71 Investments 42,967 Accrued investment income 337 Insurance and reinsurance balances receivable 2,981 Reinsurance recoverable on losses and loss expenses 1,645 Indefinite lived intangible assets 2,860 Finite lived intangible assets 4,795 Prepaid reinsurance premiums 280 Other assets 865 Unpaid losses and loss expenses (22,906 ) Unearned premiums (7,033 ) Insurance and reinsurance balances payable (511 ) Accounts payable, accrued expenses, and other liabilities (1,935 ) Deferred tax liabilities (1,335 ) Long-term debt (3,765 ) Total identifiable net assets acquired 19,316 Goodwill 10,530 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 operations: (in millions of U.S. dollars) Three Months Ended September 30, 2016 January 14, 2016 to September 30, 2016 Total revenues $ 2,656 $ 7,888 Net income $ 483 $ 1,064
Pro Forma Financial Information for the Chubb Corp Acquisition [Table Text Block]	The following table provides supplemental unaudited pro forma consolidated information for the three and nine months ended September 30, 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 Nine Months Ended September 30 September 30 (in millions of U.S. dollars, except per share data) 2016 2015 2016 2015 Total revenues $ 8,521 $ 8,314 $ 23,758 $ 24,387 Net income $ 1,345 $ 1,036 $ 2,591 $ 3,194 Earnings per share Basic earnings per share $ 2.87 $ 2.23 $ 5.54 $ 6.85 Diluted earnings per share $ 2.85 $ 2.21 $ 5.50 $ 6.78

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities and Related OTTI Recognized in AOCI	September 30, 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 $ 2,626 $ 84 $ (2 ) $ 2,708 $ — Foreign 21,499 1,057 (48 ) 22,508 (9 ) Corporate securities 22,860 977 (64 ) 23,773 (9 ) Mortgage-backed securities 13,083 383 (5 ) 13,461 (1 ) States, municipalities, and political subdivisions 18,562 357 (11 ) 18,908 — $ 78,630 $ 2,858 $ (130 ) $ 81,358 $ (19 ) Held to maturity U.S. Treasury and agency $ 709 $ 26 $ — $ 735 $ — Foreign 694 45 — 739 — Corporate securities 2,852 131 (2 ) 2,981 — Mortgage-backed securities 1,507 72 — 1,579 — States, municipalities, and political subdivisions 5,165 167 — 5,332 — $ 10,927 $ 441 $ (2 ) $ 11,366 $ — 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 Amortized Cost And Fair Value Of Fixed Maturities And Related OTTI Recognized In AOCI	September 30, 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 $ 2,626 $ 84 $ (2 ) $ 2,708 $ — Foreign 21,499 1,057 (48 ) 22,508 (9 ) Corporate securities 22,860 977 (64 ) 23,773 (9 ) Mortgage-backed securities 13,083 383 (5 ) 13,461 (1 ) States, municipalities, and political subdivisions 18,562 357 (11 ) 18,908 — $ 78,630 $ 2,858 $ (130 ) $ 81,358 $ (19 ) Held to maturity U.S. Treasury and agency $ 709 $ 26 $ — $ 735 $ — Foreign 694 45 — 739 — Corporate securities 2,852 131 (2 ) 2,981 — Mortgage-backed securities 1,507 72 — 1,579 — States, municipalities, and political subdivisions 5,165 167 — 5,332 — $ 10,927 $ 441 $ (2 ) $ 11,366 $ — 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	The following table presents fixed maturities by contractual maturity: September 30 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 $ 3,402 $ 3,413 $ 1,856 $ 1,865 Due after 1 year through 5 years 25,152 25,865 14,936 15,104 Due after 5 years through 10 years 26,702 27,645 12,258 12,173 Due after 10 years 10,291 10,974 4,272 4,487 65,547 67,897 33,322 33,629 Mortgage-backed securities 13,083 13,461 9,827 9,958 $ 78,630 $ 81,358 $ 43,149 $ 43,587 Held to maturity Due in 1 year or less $ 458 $ 462 $ 492 $ 495 Due after 1 year through 5 years 2,716 2,807 2,443 2,517 Due after 5 years through 10 years 2,815 2,919 2,292 2,313 Due after 10 years 3,431 3,599 1,496 1,484 9,420 9,787 6,723 6,809 Mortgage-backed securities 1,507 1,579 1,707 1,743 $ 10,927 $ 11,366 $ 8,430 $ 8,552
Schedule Of Cost And Fair Value Of Equity Securities	September 30 December 31 (in millions of U.S. dollars) 2016 2015 Cost $ 695 $ 441 Gross unrealized appreciation 122 74 Gross unrealized depreciation (14 ) (18 ) Fair value $ 803 $ 497
Schedule of Realized Gain (Loss)	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 Nine Months Ended September 30 September 30 (in millions of U.S. dollars) 2016 2015 2016 2015 Fixed maturities: OTTI on fixed maturities, gross $ (7 ) $ (31 ) $ (85 ) $ (57 ) OTTI on fixed maturities recognized in OCI (pre-tax) — 5 8 11 OTTI on fixed maturities, net (7 ) (26 ) (77 ) (46 ) Gross realized gains excluding OTTI 47 19 149 91 Gross realized losses excluding OTTI (13 ) (44 ) (228 ) (95 ) Total fixed maturities 27 (51 ) (156 ) (50 ) Equity securities: OTTI on equity securities (1 ) (3 ) (7 ) (4 ) Gross realized gains excluding OTTI 19 10 63 43 Gross realized losses excluding OTTI (12 ) (5 ) (17 ) (7 ) Total equity securities 6 2 39 32 OTTI on other investments (4 ) (1 ) (7 ) (1 ) Foreign exchange gains (losses) 29 (2 ) 46 (73 ) Investment and embedded derivative instruments 1 (22 ) (85 ) 6 Fair value adjustments on insurance derivative 89 (396 ) (270 ) (337 ) S&P put options and futures (45 ) 83 (88 ) 69 Other derivative instruments 3 (9 ) 1 (10 ) Other (6 ) (1 ) 10 4 Net realized gains (losses) $ 100 $ (397 ) $ (510 ) $ (360 )
Schedule Of Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which A Portion Of OTTI Was Recognized In OCI	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 Nine Months Ended September 30 September 30 (in millions of U.S. dollars) 2016 2015 2016 2015 Balance of credit losses related to securities still held – beginning of period $ 51 $ 23 $ 53 $ 28 Additions where no OTTI was previously recorded 4 8 16 15 Additions where an OTTI was previously recorded 1 6 13 8 Reductions for securities sold during the period (11 ) (5 ) (37 ) (19 ) Balance of credit losses related to securities still held – end of period $ 45 $ 32 $ 45 $ 32
Schedule Of Aggregate Fair Value And Gross Unrealized Loss By Length Of Time The Security Has Continuously Been In An Unrealized Loss Position	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 September 30, 2016 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 $ 436 $ (2 ) $ — $ — $ 436 $ (2 ) Foreign 1,899 (20 ) 409 (28 ) 2,308 (48 ) Corporate securities 1,559 (21 ) 750 (45 ) 2,309 (66 ) Mortgage-backed securities 1,039 (3 ) 292 (2 ) 1,331 (5 ) States, municipalities, and political subdivisions 2,807 (10 ) 50 (1 ) 2,857 (11 ) Total fixed maturities 7,740 (56 ) 1,501 (76 ) 9,241 (132 ) Equity securities 133 (14 ) — — 133 (14 ) Other investments 233 (27 ) — — 233 (27 ) Total $ 8,106 $ (97 ) $ 1,501 $ (76 ) $ 9,607 $ (173 ) 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	The following table presents the components of restricted assets: September 30 December 31 (in millions of U.S. dollars) 2016 2015 Trust funds $ 13,093 $ 11,862 Deposits with non-U.S. regulatory authorities 2,338 2,075 Deposits with U.S. regulatory authorities 2,232 1,242 Assets pledged under repurchase agreements 1,464 1,459 Other pledged assets 433 392 $ 19,560 $ 17,030

Fair value measurements (Tables

Fair value measurements (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Financial Instruments Measured At Fair Value On A Recurring Basis	Financial instruments measured at fair value on a recurring basis, by valuation hierarchy September 30, 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 $ 2,155 $ 553 $ — $ 2,708 Foreign — 22,405 103 22,508 Corporate securities — 23,167 606 23,773 Mortgage-backed securities — 13,415 46 13,461 States, municipalities, and political subdivisions — 18,908 — 18,908 2,155 78,448 755 81,358 Equity securities 766 — 37 803 Short-term investments 2,127 1,359 62 3,548 Other investments (1) 404 250 223 877 Securities lending collateral — 1,140 — 1,140 Investment derivative instruments 20 — — 20 Other derivative instruments 14 — — 14 Separate account assets 1,743 97 — 1,840 Total assets measured at fair value (1) $ 7,229 $ 81,294 $ 1,077 $ 89,600 Liabilities: Investment derivative instruments $ 34 $ — $ — $ 34 Other derivative instruments — — 8 8 GLB (2) — — 883 883 Total liabilities measured at fair value $ 34 $ — $ 891 $ 925 (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $ 3,498 million and other investments of $ 25 million at September 30, 2016 measured using NAV as a practical expedient. (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 as a practical expedient. (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	The following table presents, by investment category, the expected liquidation period, fair value, and maximum future funding commitments of alternative investments: September 30 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 $ 549 $ 188 $ 300 $ 105 Real Assets 3 to 7 Years 520 274 474 140 Distressed 5 to 9 Years 463 196 261 218 Private Credit 3 to 7 Years 241 294 265 209 Traditional 3 to 9 Years 1,458 999 895 152 Vintage 1 to 2 Years 23 14 13 — Investment funds Not Applicable 244 — 269 — $ 3,498 $ 1,965 $ 2,477 $ 824
Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations	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 September 30, 2016 December 31, 2015 GLB (1) $ 883 $ 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.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	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 Short-term investments Other investments Other derivative instruments GLB (1) September 30, 2016 Foreign Corporate securities MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 87 $ 281 $ 49 $ 37 $ 50 $ 216 $ 10 $ 971 Transfers into Level 3 — — — — — — — — Change in Net Unrealized Gains (Losses) included in OCI (1 ) 6 — 3 — 4 — — Net Realized Gains/Losses — (4 ) — — — — — (88 ) Purchases 20 348 — — 12 8 — — Sales (2 ) (18 ) (3 ) (3 ) — — — — Settlements (1 ) (7 ) — — — (5 ) (2 ) — Balance–End of Period $ 103 $ 606 $ 46 $ 37 $ 62 $ 223 $ 8 $ 883 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ (4 ) $ — $ — $ — $ — $ — $ (88 ) (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. Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity Other Other derivative instruments GLB (1) September 30, 2015 Foreign Corporate MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 56 $ 167 $ 55 $ 2 $ 214 $ 3 $ 347 Transfers into Level 3 1 2 — — — — — Change in Net Unrealized Gains (Losses) included in OCI 1 1 — 2 (7 ) — — Net Realized Gains/Losses (1 ) (1 ) — (1 ) — 4 397 Purchases — 22 — 1 5 — — Sales — (5 ) (1 ) — — — — Settlements (4 ) (3 ) — — (3 ) — — Balance–End of Period $ 53 $ 183 $ 54 $ 4 $ 209 $ 7 $ 744 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (1 ) $ — $ — $ (1 ) $ — $ 4 $ 397 (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 $1.0 billion at September 30, 2015 , and $615 million at June 30, 2015, which includes a fair value derivative adjustment of $744 million and $347 million, respectively. Assets Liabilities Nine Months Ended Available-for-Sale Debt Securities Equity Short-term investments Other Other GLB (1) September 30, 2016 Foreign Corporate MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 57 $ 174 $ 53 $ 16 $ — $ 212 $ 6 $ 609 Transfers into Level 3 9 18 — — — — — — Transfers out of Level 3 (2 ) — — — — — — — Change in Net Unrealized Gains (Losses) included in OCI 8 17 — 2 — 4 — — Net Realized Gains/Losses (6 ) (12 ) — 1 — — 2 274 Purchases (2) 52 472 1 23 62 22 2 — Sales (10 ) (48 ) (8 ) (5 ) — — — — Settlements (5 ) (15 ) — — — (15 ) (2 ) — Balance–End of Period $ 103 $ 606 $ 46 $ 37 $ 62 $ 223 $ 8 $ 883 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (5 ) $ (11 ) $ — $ — $ — $ — $ 2 $ 274 (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 Nine Months Ended Available-for-Sale Debt Securities Other investments Other GLB (1) September 30, 2015 Foreign Corporate MBS Equity (in millions of U.S. dollars) Balance–Beginning of Period $ 22 $ 187 $ 15 $ 2 $ 204 $ 4 $ 406 Transfers into Level 3 29 15 — — — — — Change in Net Unrealized Gains (Losses) included in OCI (1 ) 1 — 2 (7 ) — — Net Realized Gains/Losses (1 ) (4 ) — (2 ) — 3 338 Purchases 9 38 41 2 21 — — Sales (1 ) (10 ) (1 ) — — — — Settlements (4 ) (44 ) (1 ) — (9 ) — — Balance–End of Period $ 53 $ 183 $ 54 $ 4 $ 209 $ 7 $ 744 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (1 ) $ (2 ) $ — $ (2 ) $ — $ 3 $ 338 (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 $1.0 billion at September 30, 2015 , and $ 663 million at December 31, 2014, which includes a fair value derivative adjustment of $744 million and $ 406 million , respectively.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	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 Short-term investments Other investments Other derivative instruments GLB (1) September 30, 2016 Foreign Corporate securities MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 87 $ 281 $ 49 $ 37 $ 50 $ 216 $ 10 $ 971 Transfers into Level 3 — — — — — — — — Change in Net Unrealized Gains (Losses) included in OCI (1 ) 6 — 3 — 4 — — Net Realized Gains/Losses — (4 ) — — — — — (88 ) Purchases 20 348 — — 12 8 — — Sales (2 ) (18 ) (3 ) (3 ) — — — — Settlements (1 ) (7 ) — — — (5 ) (2 ) — Balance–End of Period $ 103 $ 606 $ 46 $ 37 $ 62 $ 223 $ 8 $ 883 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ (4 ) $ — $ — $ — $ — $ — $ (88 ) (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. Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity Other Other derivative instruments GLB (1) September 30, 2015 Foreign Corporate MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 56 $ 167 $ 55 $ 2 $ 214 $ 3 $ 347 Transfers into Level 3 1 2 — — — — — Change in Net Unrealized Gains (Losses) included in OCI 1 1 — 2 (7 ) — — Net Realized Gains/Losses (1 ) (1 ) — (1 ) — 4 397 Purchases — 22 — 1 5 — — Sales — (5 ) (1 ) — — — — Settlements (4 ) (3 ) — — (3 ) — — Balance–End of Period $ 53 $ 183 $ 54 $ 4 $ 209 $ 7 $ 744 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (1 ) $ — $ — $ (1 ) $ — $ 4 $ 397 (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 $1.0 billion at September 30, 2015 , and $615 million at June 30, 2015, which includes a fair value derivative adjustment of $744 million and $347 million, respectively. Assets Liabilities Nine Months Ended Available-for-Sale Debt Securities Equity Short-term investments Other Other GLB (1) September 30, 2016 Foreign Corporate MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 57 $ 174 $ 53 $ 16 $ — $ 212 $ 6 $ 609 Transfers into Level 3 9 18 — — — — — — Transfers out of Level 3 (2 ) — — — — — — — Change in Net Unrealized Gains (Losses) included in OCI 8 17 — 2 — 4 — — Net Realized Gains/Losses (6 ) (12 ) — 1 — — 2 274 Purchases (2) 52 472 1 23 62 22 2 — Sales (10 ) (48 ) (8 ) (5 ) — — — — Settlements (5 ) (15 ) — — — (15 ) (2 ) — Balance–End of Period $ 103 $ 606 $ 46 $ 37 $ 62 $ 223 $ 8 $ 883 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (5 ) $ (11 ) $ — $ — $ — $ — $ 2 $ 274 (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 Nine Months Ended Available-for-Sale Debt Securities Other investments Other GLB (1) September 30, 2015 Foreign Corporate MBS Equity (in millions of U.S. dollars) Balance–Beginning of Period $ 22 $ 187 $ 15 $ 2 $ 204 $ 4 $ 406 Transfers into Level 3 29 15 — — — — — Change in Net Unrealized Gains (Losses) included in OCI (1 ) 1 — 2 (7 ) — — Net Realized Gains/Losses (1 ) (4 ) — (2 ) — 3 338 Purchases 9 38 41 2 21 — — Sales (1 ) (10 ) (1 ) — — — — Settlements (4 ) (44 ) (1 ) — (9 ) — — Balance–End of Period $ 53 $ 183 $ 54 $ 4 $ 209 $ 7 $ 744 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (1 ) $ (2 ) $ — $ (2 ) $ — $ 3 $ 338 (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 $1.0 billion at September 30, 2015 , and $ 663 million at December 31, 2014, which includes a fair value derivative adjustment of $744 million and $ 406 million , respectively.
Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value	The following tables present fair value, by valuation hierarchy, and carrying value of the financial instruments not measured at fair value: September 30, 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 $ 628 $ 107 $ — $ 735 $ 709 Foreign — 739 — 739 694 Corporate securities — 2,968 13 2,981 2,852 Mortgage-backed securities — 1,579 — 1,579 1,507 States, municipalities, and political subdivisions — 5,332 — 5,332 5,165 Total assets $ 628 $ 10,725 $ 13 $ 11,366 $ 10,927 Liabilities: Repurchase agreements $ — $ 1,406 $ — $ 1,406 $ 1,406 Short-term debt — 508 — 508 500 Long-term debt — 13,762 — 13,762 12,621 Trust preferred securities — 463 — 463 308 Total liabilities $ — $ 16,139 $ — $ 16,139 $ 14,835 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)	9 Months Ended
	Sep. 30, 2016
Reinsurance Disclosures [Abstract]
Schedule Of Guaranteed Minimum Death Benefits And Guaranteed Minimum Income Benefits Income And Expense	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 Nine Months Ended September 30 September 30 (in millions of U.S. dollars) 2016 2015 2016 2015 GMDB Net premiums earned $ 15 $ 15 $ 42 $ 47 Policy benefits and other reserve adjustments $ 11 $ 5 $ 34 $ 25 GLB Net premiums earned $ 28 $ 30 $ 88 $ 92 Policy benefits and other reserve adjustments 9 15 24 34 Net realized gains (losses) 86 (397 ) (285 ) (338 ) Loss recognized in Net income $ 105 $ (382 ) $ (221 ) $ (280 ) Less: Net cash received 15 20 57 74 Net (increase) decrease in liability $ 90 $ (402 ) $ (278 ) $ (354 )

Goodwill and other intangible29

Goodwill and other intangible assets Goodwill and other intangible assets (Tables)	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	The following table presents a roll-forward of Goodwill by segment for the nine months ended September 30, 2016 : (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 5,711 2,025 — 2,794 — — 10,530 Foreign exchange revaluation 43 13 — 98 — 1 155 Balance at September 30, 2016 $ 6,957 $ 2,234 $ 134 $ 4,970 $ 365 $ 821 $ 15,481
Intangible assets acquired as part of 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) Preliminary purchase price allocation 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]	The following table presents, as of September 30, 2016 , the expected estimated pre-tax amortization expense (benefit), at current foreign currency exchange rates, for the fourth quarter of 2016 and the next five years, related to purchased intangibles as well as the fair value adjustment to Unpaid losses and loss expenses 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 expenses Total Other intangible assets Total Amortization of purchased intangibles Fourth quarter of 2016 $ 33 $ 8 $ (61 ) $ (20 ) $ 23 $ 3 2017 296 32 (161 ) 167 85 252 2018 324 32 (102 ) 254 73 327 2019 281 — (62 ) 219 66 285 2020 240 — (36 ) 204 59 263 2021 217 — (20 ) 197 53 250 Total $ 1,391 $ 72 $ (442 ) $ 1,021 $ 359 $ 1,380

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Schedule of Debt [Table Text Block]	September 30 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) $ 1,406 $ 1,404 None Short-term debt Chubb INA senior notes: $500 million 5.7% due February 2017 $ 500 $ — Make-whole premium plus 0.20% 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 300 299 Make-whole premium plus 0.35% $600 million 5.75% due May 2018 641 — Make-whole premium plus 0.30% $100 million 6.6% due August 2018 109 — None $500 million 5.9% due June 2019 498 497 Make-whole premium plus 0.40% $1,300 million 2.3% due November 2020 1,294 1,294 Make-whole premium plus 0.15% $1,000 million 2.875% due November 2022 994 994 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 1,488 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 258 — 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 982 — Make-whole premium plus 0.20% $600 million 6.5% due May 2038 778 — 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 (1) 961 — 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 $ 12,621 $ 9,389 Trust preferred securities Chubb INA capital securities due April 2030 $ 308 $ 307 Redemption prices (2) (1) 6.375% interest rate through April 14, 2017; interest rate equal to three month LIBOR rate plus 2.25% thereafter. (2) 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)	9 Months Ended
	Sep. 30, 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	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: September 30, 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) $ 10 $ (32 ) $ 2,025 $ 7 $ (11 ) $ 1,029 Cross-currency swaps OA / (AP) — — 95 — — 95 Options/Futures contracts on bonds and equities OA / (AP) 10 (2 ) 1,353 5 (2 ) 751 Convertible securities (1) FM AFS / ES 5 — 8 31 — 40 $ 25 $ (34 ) $ 3,481 $ 43 $ (13 ) $ 1,915 Other derivative instruments Futures contracts on equities (2) OA / (AP) $ 4 $ — $ 1,275 $ — $ (4 ) $ 1,197 Other OA / (AP) 10 (8 ) 243 — (6 ) 15 $ 14 $ (8 ) $ 1,518 $ — $ (10 ) $ 1,212 GLB (3) (AP) / (FPB) $ — $ (1,166 ) $ 1,436 $ — $ (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.
Transfer of Certain Financial Assets Accounted for as Secured Borrowings	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 September 30, 2016 Overnight and Continuous (in millions of U.S. dollars) Collateral held under securities lending agreements: Cash $ 449 U.S. Treasury and agency 53 Foreign 324 Corporate securities 4 Mortgage-backed securities 38 Equity securities 272 $ 1,140 Gross amount of recognized liability for securities lending payable $ 1,141 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]	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 September 30, 2016 Up to 30 Days 30 - 90 Days Greater than 90 Days Total (in millions of U.S. dollars) Collateral pledged under repurchase agreements: U.S. Treasury and agency $ 5 $ — $ 232 $ 237 Mortgage-backed securities 408 484 335 1,227 $ 413 $ 484 $ 567 $ 1,464 Gross amount of recognized liabilities for repurchase agreements $ 1,406 Difference (1) $ 58 (1) Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.
Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations	The following table presents net realized gains (losses) related to derivative instrument activity in the Consolidated statements of operations: Three Months Ended Nine Months Ended September 30 September 30 (in millions of U.S. dollars) 2016 2015 2016 2015 Investment and embedded derivative instruments Foreign currency forward contracts $ (10 ) $ 15 $ (30 ) $ 30 All other futures contracts and options 8 (23 ) (63 ) (10 ) Convertible securities (1) 3 (14 ) 8 (14 ) Total investment and embedded derivative instruments $ 1 $ (22 ) $ (85 ) $ 6 GLB and other derivative instruments GLB (2) $ 89 $ (396 ) $ (270 ) $ (337 ) Futures contracts on equities (3) (45 ) 84 (88 ) 71 Options on equity market indices (3) — (1 ) — (2 ) Other 3 (9 ) 1 (10 ) Total GLB and other derivative instruments $ 47 $ (322 ) $ (357 ) $ (278 ) $ 48 $ (344 ) $ (442 ) $ (272 ) (1) Includes embedded derivatives. (2) Excludes foreign exchange gains (losses) related to GLB. (3) Related to GMDB and GLB blocks of business.

Shareholders' equity Shareholde

Shareholders' equity Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 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 Nine Months Ended September 30 September 30 2016 2015 2016 2015 CHF USD CHF USD CHF USD CHF USD Dividends – par value reduction — $ — — $ — — $ — 0.62 $ 0.65 Dividends – distributed from capital contribution reserves 0.67 0.69 0.65 0.67 2.01 2.05 1.27 1.34 Total dividend distributions per common share 0.67 $ 0.69 0.65 $ 0.67 2.01 $ 2.05 1.89 $ 1.99

Postretirement benefits (Tables

Postretirement benefits (Tables)	9 Months Ended
	Sep. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]	At the date of the acquisition of Chubb Corp, we assumed the following postretirement benefit plan assets and obligations: Pension Benefits Other Postretirement Benefits January 14, 2016 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 obligations (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 tables summarize the components of net periodic benefit costs for our pension and postretirement benefit plans recognized in the Consolidated statements of operations: Three Months Ended September 30 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 2016 Net periodic benefit cost: Service cost $ 20 $ 6 $ 26 $ 4 $ — $ 4 Interest cost 26 8 34 4 — 4 Expected return on plan assets (42 ) (10 ) (52 ) (3 ) — (3 ) Amortization of net actuarial loss — — — — — — Curtailments (4 ) — (4 ) — — — Settlements (1 ) — (1 ) — — — Net periodic benefit cost $ (1 ) $ 4 $ 3 $ 5 $ — $ 5 2015 Net periodic benefit cost: Service cost $ — $ 2 $ 2 Interest cost — 5 5 Expected return on plan assets — (7 ) (7 ) Amortization of net actuarial loss — — — Net periodic benefit cost $ — $ — $ — Nine Months Ended September 30 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 2016 Net periodic benefit cost: Service cost $ 57 $ 15 $ 72 $ 8 $ 1 $ 9 Interest cost 80 24 104 13 — 13 Expected return on plan assets (121 ) (30 ) (151 ) (7 ) — (7 ) Amortization of net actuarial loss — 2 2 — — — Curtailments (4 ) — (4 ) — — — Settlements (1 ) — (1 ) — — — Net periodic benefit cost $ 11 $ 11 $ 22 $ 14 $ 1 $ 15 2015 Net periodic benefit cost: Service cost $ — $ 5 $ 5 Interest cost — 15 15 Expected return on plan assets — (21 ) (21 ) Amortization of net actuarial loss — 2 2 Net periodic benefit cost $ — $ 1 $ 1
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 September 30, 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 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 (Tables)

Segment information (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Operations By Segment	The following tables present the Statement of Operations by segment: 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 For the Three Months Ended September 30, 2016 (in millions of U.S. dollars) Net premiums written $ 3,110 $ 1,011 $ 849 $ 1,940 $ 131 $ 532 $ — $ 7,573 Net premiums earned 3,086 1,081 819 2,034 156 512 — 7,688 Losses and loss expenses 1,863 594 683 843 49 174 63 4,269 Policy benefits — — — — — 155 — 155 Policy acquisition costs 522 229 48 546 42 127 — 1,514 Administrative expenses 275 89 1 261 12 77 57 772 Underwriting income (loss) 426 169 87 384 53 (21 ) (120 ) 978 Net investment income (loss) 477 53 5 152 67 71 (86 ) 739 Other (income) expense 3 2 — (6 ) — (20 ) (70 ) (91 ) Amortization expense (benefit) of purchased intangibles — 4 7 12 — 1 (20 ) 4 Segment income (loss) 900 216 85 530 120 69 (116 ) 1,804 Net realized gains including OTTI 100 100 Interest expense 152 152 Chubb integration expenses 115 115 Income tax expense 277 277 Net income (loss) $ (560 ) $ 1,360 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 For the Three Months Ended September 30, 2015 (in millions of U.S. dollars) Net premiums written $ 1,433 $ 278 $ 737 $ 1,584 $ 185 $ 492 $ — $ 4,709 Net premiums earned 1,410 272 739 1,615 203 480 — 4,719 Losses and loss expenses 913 179 620 674 20 153 84 2,643 Policy benefits — — — — — 89 — 89 Policy acquisition costs 142 13 42 405 52 117 — 771 Administrative expenses 154 36 — 246 12 74 46 568 Underwriting income (loss) 201 44 77 290 119 47 (130 ) 648 Net investment income 260 7 5 132 76 66 3 549 Other (income) expense (3 ) 1 (1 ) (6 ) (4 ) 48 (23 ) 12 Amortization of purchased intangibles — 31 8 12 — — — 51 Segment income (loss) 464 19 75 416 199 65 (104 ) 1,134 Net realized gains (losses) including OTTI (397 ) (397 ) Interest expense 68 68 Chubb integration expenses 9 9 Income tax expense 132 132 Net income (loss) $ (710 ) $ 528 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 For the Nine Months Ended September 30, 2016 (in millions of U.S. dollars) Net premiums written $ 8,657 $ 3,113 $ 1,288 $ 6,012 $ 562 $ 1,575 $ — $ 21,207 Net premiums earned 9,130 3,245 1,169 6,082 543 1,521 — 21,690 Losses and loss expenses 5,581 1,916 937 2,953 225 498 87 12,197 Policy benefits — — — — — 427 — 427 Policy acquisition costs 1,549 747 77 1,586 142 386 — 4,487 Administrative expenses 840 275 (1 ) 801 40 226 192 2,373 Underwriting income (loss) 1,160 307 156 742 136 (16 ) (279 ) 2,206 Net investment income (loss) 1,371 155 15 445 199 207 (271 ) 2,121 Other (income) expense (6 ) 6 — (16 ) (3 ) (14 ) (59 ) (92 ) Amortization expense (benefit) of purchased intangibles — 16 22 36 — 2 (60 ) 16 Segment income (loss) 2,537 440 149 1,167 338 203 (431 ) 4,403 Net realized gains (losses) including OTTI (510 ) (510 ) Interest expense 451 451 Chubb integration expenses 361 361 Income tax expense 556 556 Net income (loss) $ (2,309 ) $ 2,525 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 For the Nine Months Ended September 30, 2015 (in millions of U.S. dollars) Net premiums written $ 4,158 $ 958 $ 1,204 $ 5,047 $ 719 $ 1,483 $ — $ 13,569 Net premiums earned 4,209 687 1,124 4,896 649 1,441 — 13,006 Losses and loss expenses 2,744 446 913 2,304 191 442 142 7,182 Policy benefits — — — — — 384 — 384 Policy acquisition costs 403 43 61 1,190 166 342 — 2,205 Administrative expenses 459 89 3 756 37 221 135 1,700 Underwriting income (loss) 603 109 147 646 255 52 (277 ) 1,535 Net investment income 780 19 17 409 230 198 9 1,662 Other (income) expense (5 ) 1 1 (12 ) (5 ) 32 (73 ) (61 ) Amortization of purchased intangibles — 63 22 50 — 1 — 136 Segment income (loss) 1,388 64 141 1,017 490 217 (195 ) 3,122 Net realized gains (losses) including OTTI (360 ) (360 ) Interest expense 207 207 Chubb integration expenses 9 9 Income tax expense 395 395 Net income (loss) $ (1,166 ) $ 2,151

Earnings per share (Tables)

Earnings per share (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Schedule Of Earnings Per Share, Basic And Diluted	Three Months Ended Nine Months Ended September 30 September 30 (in millions of U.S. dollars, except share and per share data) 2016 2015 2016 2015 Numerator: Net income $ 1,360 $ 528 $ 2,525 $ 2,151 Denominator: Denominator for basic earnings per share: Weighted-average shares outstanding 468,021,093 324,210,936 460,631,794 325,904,502 Denominator for diluted earnings per share: Share-based compensation plans 3,375,269 2,962,484 3,439,017 3,269,724 Weighted-average shares outstanding and assumed conversions 471,396,362 327,173,420 464,070,811 329,174,226 Basic earnings per share $ 2.90 $ 1.63 $ 5.48 $ 6.60 Diluted earnings per share $ 2.88 $ 1.62 $ 5.44 $ 6.53 Potential anti-dilutive share conversions 1,306,710 1,907,815 1,635,337 1,503,830

Information provided in conne36

Information provided in connection with outstanding debt of subsidiaries (Tables)	9 Months Ended
	Sep. 30, 2016
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract]
Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet at September 30, 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 $ 25 $ 812 $ 100,199 $ — $ 101,036 Cash (1) 6 2 2,158 (1,296 ) 870 Insurance and reinsurance balances receivable — — 11,392 (2,899 ) 8,493 Reinsurance recoverable on losses and loss expenses — — 23,642 (10,194 ) 13,448 Reinsurance recoverable on policy benefits — — 1,167 (972 ) 195 Value of business acquired — — 368 — 368 Goodwill and other intangible assets — — 22,472 — 22,472 Investments in subsidiaries 38,403 50,316 — (88,719 ) — Due from subsidiaries and affiliates, net 11,186 — — (11,186 ) — Other assets 5 366 18,856 (4,299 ) 14,928 Total assets $ 49,625 $ 51,496 $ 180,254 $ (119,565 ) $ 161,810 Liabilities Unpaid losses and loss expenses $ — $ — $ 70,882 $ (9,535 ) $ 61,347 Unearned premiums — — 18,773 (3,719 ) 15,054 Future policy benefits — — 5,982 (972 ) 5,010 Due to subsidiaries and affiliates, net — 10,996 190 (11,186 ) — Affiliated notional cash pooling programs (1) 927 369 — (1,296 ) — Repurchase agreements — — 1,406 — 1,406 Short-term debt — 500 — — 500 Long-term debt — 12,610 11 — 12,621 Trust preferred securities — 308 — — 308 Other liabilities 326 1,588 19,416 (4,138 ) 17,192 Total liabilities 1,253 26,371 116,660 (30,846 ) 113,438 Total shareholders’ equity 48,372 25,125 63,594 (88,719 ) 48,372 Total liabilities and shareholders’ equity $ 49,625 $ 51,496 $ 180,254 $ (119,565 ) $ 161,810 (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 September 30, 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 September 30, 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 $ — $ — $ 7,573 $ — $ 7,573 Net premiums earned — — 7,688 — 7,688 Net investment income 1 2 736 — 739 Equity in earnings of subsidiaries 1,292 748 — (2,040 ) — Net realized gains (losses) including OTTI — (2 ) 102 — 100 Losses and loss expenses — — 4,269 — 4,269 Policy benefits — — 155 — 155 Policy acquisition costs and administrative expenses 15 12 2,259 — 2,286 Interest (income) expense (93 ) 233 12 — 152 Other (income) expense (7 ) 6 (90 ) — (91 ) Amortization of purchased intangibles — — 4 — 4 Chubb integration expenses 12 16 87 — 115 Income tax expense (benefit) 6 (136 ) 407 — 277 Net income $ 1,360 $ 617 $ 1,423 $ (2,040 ) $ 1,360 Comprehensive income $ 1,376 $ 627 $ 1,439 $ (2,066 ) $ 1,376 Condensed Consolidating Statements of Operations and Comprehensive Income For the Three Months Ended September 30, 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 $ — $ — $ 4,709 $ — $ 4,709 Net premiums earned — — 4,719 — 4,719 Net investment income 1 1 547 — 549 Equity in earnings of subsidiaries 488 255 — (743 ) — Net realized gains (losses) including OTTI — (4 ) (393 ) — (397 ) Losses and loss expenses — — 2,643 — 2,643 Policy benefits — — 89 — 89 Policy acquisition costs and administrative expenses 15 7 1,317 — 1,339 Interest (income) expense (8 ) 68 8 — 68 Other (income) expense (51 ) (5 ) 68 — 12 Amortization of purchased intangibles — — 51 — 51 Chubb integration expenses 1 8 — — 9 Income tax expense (benefit) 4 (31 ) 159 — 132 Net income $ 528 $ 205 $ 538 $ (743 ) $ 528 Comprehensive income (loss) $ (271 ) $ (265 ) $ (262 ) $ 527 $ (271 ) Condensed Consolidating Statements of Operations and Comprehensive Income Nine Months Ended September 30, 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 $ — $ — $ 21,207 $ — $ 21,207 Net premiums earned — — 21,690 — 21,690 Net investment income 3 9 2,109 — 2,121 Equity in earnings of subsidiaries 2,331 1,803 — (4,134 ) — Net realized gains (losses) including OTTI (1 ) (3 ) (506 ) — (510 ) Losses and loss expenses — — 12,197 — 12,197 Policy benefits — — 427 — 427 Policy acquisition costs and administrative expenses 48 144 6,668 — 6,860 Interest (income) expense (266 ) 681 36 — 451 Other (income) expense (20 ) 26 (98 ) — (92 ) Amortization of purchased intangibles — — 16 — 16 Chubb integration expenses 29 56 276 — 361 Income tax expense (benefit) 17 (323 ) 862 — 556 Net income $ 2,525 $ 1,225 $ 2,909 $ (4,134 ) $ 2,525 Comprehensive income $ 4,457 $ 2,687 $ 4,841 $ (7,528 ) $ 4,457 Condensed Consolidating Statements of Operations and Comprehensive Income Nine Months Ended September 30, 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 $ — $ — $ 13,569 $ — $ 13,569 Net premiums earned — — 13,006 — 13,006 Net investment income 2 2 1,658 — 1,662 Equity in earnings of subsidiaries 2,037 755 — (2,792 ) — Net realized gains (losses) including OTTI — (6 ) (354 ) — (360 ) Losses and loss expenses — — 7,182 — 7,182 Policy benefits — — 384 — 384 Policy acquisition costs and administrative expenses 47 20 3,838 — 3,905 Interest (income) expense (23 ) 206 24 — 207 Other (income) expense (149 ) (12 ) 100 — (61 ) Amortization of purchased intangibles — — 136 — 136 Chubb integration expenses 1 8 — — 9 Income tax expense (benefit) 12 (84 ) 467 — 395 Net income $ 2,151 $ 613 $ 2,179 $ (2,792 ) $ 2,151 Comprehensive income (loss) $ 768 $ (332 ) $ 795 $ (463 ) $ 768
Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 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 $ 3,399 $ 3,892 $ 3,918 $ (7,372 ) $ 3,837 Cash flows from investing activities Purchases of fixed maturities available for sale — (154 ) (23,683 ) — (23,837 ) Purchases of fixed maturities held to maturity — — (189 ) — (189 ) Purchases of equity securities — — (100 ) — (100 ) Sales of fixed maturities available for sale — 66 13,797 — 13,863 Sales of equity securities — — 963 — 963 Maturities and redemptions of fixed maturities available for sale — 59 6,877 — 6,936 Maturities and redemptions of fixed maturities held to maturity — — 627 — 627 Net change in short-term investments — 7,627 4,239 — 11,866 Net derivative instruments settlements — (10 ) (171 ) — (181 ) Acquisition of subsidiaries (net of cash acquired of $71) — (14,282 ) 34 — (14,248 ) Capital contribution (2,330 ) (20 ) (2,330 ) 4,680 — Other — (3 ) 29 — 26 Net cash flows (used for) from investing activities (2,330 ) (6,717 ) 93 4,680 (4,274 ) Cash flows from financing activities Dividends paid on Common Shares (851 ) — — — (851 ) Proceeds from issuance of repurchase agreements — — 1,457 — 1,457 Repayment of repurchase agreements — — (1,455 ) — (1,455 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 117 — 117 Dividend to parent company — — (7,372 ) 7,372 — Advances (to) from affiliates (258 ) 219 39 — — Capital contribution — 2,330 2,350 (4,680 ) — Net proceeds from (payments to) affiliated notional cash pooling programs (1) 45 280 — (325 ) — Policyholder contract deposits — — 473 — 473 Policyholder contract withdrawals — — (247 ) — (247 ) Other — (4 ) — — (4 ) Net cash flows (used for) from financing activities (1,064 ) 2,825 (4,638 ) 2,367 (510 ) Effect of foreign currency rate changes on cash and cash equivalents — — 42 — 42 Net increase (decrease) in cash 5 — (585 ) (325 ) (905 ) Cash – beginning of period (1) 1 2 2,743 (971 ) 1,775 Cash – end of period (1) $ 6 $ 2 $ 2,158 $ (1,296 ) $ 870 (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 September 30, 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 Nine Months Ended September 30, 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 (used for) operating activities $ 350 $ (46 ) $ 2,671 $ (276 ) $ 2,699 Cash flows from investing activities Purchases of fixed maturities available for sale — — (13,052 ) (8 ) (13,060 ) Purchases of fixed maturities held to maturity — — (39 ) — (39 ) Purchases of equity securities — — (122 ) — (122 ) Sales of fixed maturities available for sale — — 5,233 — 5,233 Sales of equity securities — — 150 — 150 Maturities and redemptions of fixed maturities available for sale — — 5,257 — 5,257 Maturities and redemptions of fixed maturities held to maturity — — 552 — 552 Net change in short-term investments — 215 206 — 421 Net derivative instruments settlements — (10 ) 72 — 62 Acquisition of subsidiaries (net of cash acquired of $620) — — 259 — 259 Capital contribution — (625 ) — 625 — Other — (25 ) (121 ) 8 (138 ) Net cash flows from (used for) investing activities — (445 ) (1,605 ) 625 (1,425 ) Cash flows from financing activities Dividends paid on Common Shares (644 ) — — — (644 ) Common Shares repurchased — — (758 ) — (758 ) Proceeds from issuance of long-term debt — 800 — — 800 Proceeds from issuance of repurchase agreements — — 1,478 — 1,478 Repayment of long-term debt — (450 ) (1 ) — (451 ) Repayment of repurchase agreements — — (1,477 ) — (1,477 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 89 — 89 Dividend to parent company — — (276 ) 276 — Advances (to) from affiliates (416 ) 272 144 — — Capital contribution — — 625 (625 ) — Net proceeds from (payments to) affiliated notional cash pooling programs (1) 727 (121 ) — (606 ) — Policyholder contract deposits — — 351 — 351 Policyholder contract withdrawals — — (159 ) — (159 ) Other — (6 ) — — (6 ) Net cash flows used for financing activities (333 ) 495 16 (955 ) (777 ) Effect of foreign currency rate changes on cash and cash equivalents — — (114 ) — (114 ) Net increase in cash 17 4 968 (606 ) 383 Cash – beginning of period (1) — 1 1,209 (555 ) 655 Cash – end of period (1) $ 17 $ 5 $ 2,177 $ (1,161 ) $ 1,038 (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 September 30, 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 ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Issuance Costs	$ 60
Long-term Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Issuance Costs	58
Trust Preferred Securities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Issuance Costs	$ 2

Acquisitions (Detail)

Acquisitions (Detail) $ / shares in Units, $ in Millions	Jan. 14, 2016USD ($)$ / sharesshares	Apr. 01, 2015USD ($)	Sep. 30, 2016USD ($)shares		Sep. 30, 2015USD ($)shares		Sep. 30, 2016USD ($)shares		Sep. 30, 2015USD ($)shares		Dec. 31, 2015USD ($)		Dec. 31, 2014USD ($)	[3]
Business Acquisition [Line Items]
Other intangible assets			$ 6,991				$ 6,991				$ 887
Weighted-average shares outstanding | shares			468,021,093		324,210,936		460,631,794		325,904,502
Cash			$ 870	[1],[2]	$ 1,038	[3]	$ 870	[1],[2]	$ 1,038	[3]	1,775	[1],[4]	$ 655
Investments			101,036				101,036				66,251
Accrued investment income			915				915				513
Insurance and reinsurance balances receivable			8,493				8,493				5,323
Reinsurance recoverable on losses and loss expenses			13,448				13,448				11,386
Prepaid reinsurance premiums			2,449				2,449				2,082
Other assets			5,521				5,521				3,821
Unpaid losses and loss expenses			(61,347)				(61,347)				(37,303)
Unearned premiums			(15,054)				(15,054)				(8,439)
Insurance and reinsurance balances payable			(4,885)				(4,885)				(4,270)
Accounts payable, accrued expenses, and other liabilities			(9,748)				(9,748)				(6,205)
Long-term debt			(12,621)				(12,621)				(9,389)
Goodwill			15,481				15,481				$ 4,796
Chubb integration expenses			$ 115		9		361		9
The Chubb Corporation [Member]
Business Acquisition [Line Items]
Purchase price	$ 29,500
Goodwill, Purchase Accounting Adjustment							$ 85
Business Acquisition, Financing Of Acquisition With Cash	9,000
Senior notes issued to finance acquisition	$ 5,300
Weighted-average shares outstanding | shares	228,000,000
Per share exchange ratio	0.6019
Common shares issued by Chubb Limited | shares	137,000,000
Share Price | $ / shares	$ 111.02
Fair value of common shares issued by Chubb Limited to common shareholders of Chubb Corp	$ 15,204
Agreed cash price per share paid to common shareholders of Chubb Corp | $ / shares	$ 62.93
Payments to Acquire Businesses, Gross	$ 14,319
Attributed Value Equity Awards Assumed in Acquisition	323
Purchase price	29,846
Cash	71
Investments	42,967
Accrued investment income	337
Insurance and reinsurance balances receivable	2,981
Reinsurance recoverable on losses and loss expenses	1,645
Indefinite-Lived Intangible Assets	2,860
Finite lived intangible assets	4,795
Prepaid reinsurance premiums	280
Other assets	865
Unpaid losses and loss expenses	(22,906)
Unearned premiums	(7,033)
Insurance and reinsurance balances payable	(511)
Accounts payable, accrued expenses, and other liabilities	(1,935)
Deferred Tax Liabilities, Net	(1,335)
Long-term debt	(3,765)
Total identifiable net assets acquired	19,316
Goodwill	10,530
Chubb integration expenses					$ 9
Total Value of Equity Awards Issued in Acquisition	525
Fireman's Fund high net worth personal lines [Member]
Business Acquisition [Line Items]
Acquired assets fair value		$ 753
Other intangible assets		278
Payments to Acquire Businesses, Gross		365
Cash		629
Insurance and reinsurance balances receivable		124
Unpaid losses and loss expenses		(417)
Unearned premiums		(428)
Goodwill		196
Assumed liabilities fair value		$ 863
Minimum [Member]
Business Acquisition [Line Items]
Estimated Useful Life							1 year
Maximum [Member]
Business Acquisition [Line Items]
Estimated Useful Life							24 years
Additional Paid-in Capital [Member]
Business Acquisition [Line Items]
Attributed Value Equity Awards Assumed in Acquisition							$ (365)		(157)
Additional Paid-in Capital [Member] | The Chubb Corporation [Member]
Business Acquisition [Line Items]
Attributed Value Equity Awards Assumed in Acquisition	$ 323						$ 323		$ 0
[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 September 30, 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 September 30, 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 September 30, 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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Chubb integration expenses	$ 115	$ 9		$ 361	$ 9
Actual Revenue of Chubb Corp since Acquisition Date	2,656		$ 7,888
Actual Net Income of Chubb Corp since Acquisition Date	483		$ 1,064
Pro Forma Total Revenues	8,521	8,314		23,758	24,387
Pro Forma Net Income	$ 1,345	$ 1,036		$ 2,591	$ 3,194
Pro Forma Earnings Per Share, Basic	$ 2.87	$ 2.23		$ 5.54	$ 6.85
Pro Forma Earnings Per Share, Diluted	$ 2.85	$ 2.21		$ 5.50	$ 6.78
The Chubb Corporation [Member]
Business Acquisition [Line Items]
Chubb integration expenses		$ 9

Investments (Narrative) (Detail

Investments (Narrative) (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)Security	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)Security	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Investment [Line Items]
Total number of fixed maturities | Security	31,902		31,902
Number of equity securities in an unrealized loss position | Security	73		73
Total number of equity securities | Security	326		326
Largest single unrealized loss in the equity securities	$ (3)		$ (3)
Restricted assets in fixed maturities and short-term investments	19,400		19,400		$ 16,900
Restricted assets in cash	162		$ 162		110
Moodys Historical Mean Recovery Rate			42.00%
Company Assumed Recovery Rate			32.00%
Net unrealized appreciation (depreciation) included in OCI	13	$ (4)	$ 57	$ 0
Unrealized appreciation (depreciation) portion of AOCI with OTTI included in AOCI	$ 7		$ 7		$ (35)
Number of fixed maturities in an unrealized loss position | Security	3,376		3,376
Percentage of mortgage-backed securities represented by investments in US government agency bonds	81.00%		81.00%		81.00%
Largest single unrealized loss in the fixed maturities	$ (2)		$ (2)
Corporate [Member]
Investment [Line Items]
Credit losses recognized in net income	4	14	28	23
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Credit losses recognized in net income	$ 1	$ 0	$ 1	$ 0

Investments Investments (Schedu

Investments Investments (Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities and Related OTTI Recognized in AOCI) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	$ 78,630	$ 43,149
Available-for-sale,Gross Unrealized Gain	2,858	1,168
Available-for-sale, Gross Unrealized Depreciation	(130)	(730)
Available for sale, Fair Value	81,358	43,587
Available for sale, OTTI recognized in AOCI	(19)	(42)
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	2,626	2,481
Available-for-sale,Gross Unrealized Gain	84	52
Available-for-sale, Gross Unrealized Depreciation	(2)	(5)
Available for sale, Fair Value	2,708	2,528
Available for sale, OTTI recognized in AOCI	0	0
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	21,499	13,190
Available-for-sale,Gross Unrealized Gain	1,057	468
Available-for-sale, Gross Unrealized Depreciation	(48)	(213)
Available for sale, Fair Value	22,508	13,445
Available for sale, OTTI recognized in AOCI	(9)	(13)
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	22,860	15,028
Available-for-sale,Gross Unrealized Gain	977	355
Available-for-sale, Gross Unrealized Depreciation	(64)	(454)
Available for sale, Fair Value	23,773	14,929
Available for sale, OTTI recognized in AOCI	(9)	(28)
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	13,083	9,827
Available-for-sale,Gross Unrealized Gain	383	183
Available-for-sale, Gross Unrealized Depreciation	(5)	(52)
Available for sale, Fair Value	13,461	9,958
Available for sale, OTTI recognized in AOCI	(1)	(1)
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	18,562	2,623
Available-for-sale,Gross Unrealized Gain	357	110
Available-for-sale, Gross Unrealized Depreciation	(11)	(6)
Available for sale, Fair Value	18,908	2,727
Available for sale, OTTI recognized in AOCI	$ 0	$ 0

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	Sep. 30, 2016	Dec. 31, 2015
Investment [Line Items]
Held to maturity, Amortized Cost	$ 10,927	$ 8,430
Held to maturity, Gross Unrealized Appreciation	441	190
Held to maturity, Gross Unrealized Depreciation	(2)	(68)
Held to maturity, at Fair Value	11,366	8,552
U.S. Treasury And Agency [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	709	733
Held to maturity, Gross Unrealized Appreciation	26	13
Held to maturity, Gross Unrealized Depreciation	0	(1)
Held to maturity, at Fair Value	735	745
Held to maturity, OTTI recognized in AOCI	0	0
Foreign [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	694	763
Held to maturity, Gross Unrealized Appreciation	45	30
Held to maturity, Gross Unrealized Depreciation	0	(8)
Held to maturity, at Fair Value	739	785
Held to maturity, OTTI recognized in AOCI	0	0
Corporate [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	2,852	3,054
Held to maturity, Gross Unrealized Appreciation	131	57
Held to maturity, Gross Unrealized Depreciation	(2)	(55)
Held to maturity, at Fair Value	2,981	3,056
Held to maturity, OTTI recognized in AOCI	0	0
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	1,507	1,707
Held to maturity, Gross Unrealized Appreciation	72	38
Held to maturity, Gross Unrealized Depreciation	0	(2)
Held to maturity, at Fair Value	1,579	1,743
Held to maturity, OTTI recognized in AOCI	0	0
States, Municipalities, And Political Subdivisions [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	5,165	2,173
Held to maturity, Gross Unrealized Appreciation	167	52
Held to maturity, Gross Unrealized Depreciation	0	(2)
Held to maturity, at Fair Value	5,332	2,223
Held to maturity, OTTI recognized in AOCI	$ 0	$ 0

Investments (Schedule Of Fixed

Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 3,402	$ 1,856
Available for sale, Due after 1 year through 5 years, Amortized Cost	25,152	14,936
Available for sale, Due after 5 years though 10 years, Amortized Cost	26,702	12,258
Available for sale, Due after 10 years, Amortized Cost	10,291	4,272
Available for sale, Subtotal, Amortized Cost	65,547	33,322
Available for sale, Mortgage-backed securities, Amortized Cost	13,083	9,827
Available for sale, at amortized cost	78,630	43,149
Available for sale, Fair Value	81,358	43,587
Held to maturity, Due in 1 year or less, Amortized Cost	458	492
Held to maturity, Due after 1 year through 5 years, Amortized Cost	2,716	2,443
Held to maturity, Due after 5 years through 10 years, Amortized Cost	2,815	2,292
Held to maturity, Due after 10 years, Amortized Cost	3,431	1,496
Held to maturity, Subtotal, Amortized Cost	9,420	6,723
Held to maturity, Mortgage backed securities, Amortized Cost	1,507	1,707
Available for sale, Due in 1 year or less, Fair Value	3,413	1,865
Available for sale, Due after 1 year through 5 years, Fair Value	25,865	15,104
Available for sale, Due after 5 years through 10 years, Fair Value	27,645	12,173
Available for sale, Due after 10 years, Fair Value	10,974	4,487
Available for sale, Subtotal, Fair Value	67,897	33,629
Available for sale, Mortgage backed securities, Fair Value	13,461	9,958
Held to maturity, Due in 1 year or less, Fair Value	462	495
Held to maturity, Due after 1 year through 5, Fair Value	2,807	2,517
Held to maturity, Due after 5 years through 10 years, Fair Value	2,919	2,313
Held to maturity, Due after 10 years, Fair Value	3,599	1,484
Held to maturity, Subtotal, Fair Value	9,787	6,809
Held to maturity, Mortgage backed securities, Fair Value	1,579	1,743
Held to maturity, Amortized Cost	10,927	8,430
Held to maturity, Fair Value	$ 11,366	$ 8,552

Investments (Schedule Of Cost A

Investments (Schedule Of Cost And Fair Value Of Equity Securities) (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Cost	$ 695	$ 441
Gross unrealized appreciation	122	74
Gross unrealized depreciation	(14)	(18)
Equity securities, at fair value	$ 803	$ 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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
OTTI on fixed maturities, gross	$ (7)	$ (31)	$ (85)	$ (57)
OTTI on fixed maturities recognized in OCI (pre-tax)	0	5	8	11
OTTI on fixed maturities, net	(7)	(26)	(77)	(46)
Gross realized gains excluding OTTI	47	19	149	91
Gross realized losses excluding OTTI	(13)	(44)	(228)	(95)
Fixed Maturities Net Realized Gains Losses Total	27	(51)	(156)	(50)
Other Than Temporary Impairment on Equity Securities	(1)	(3)	(7)	(4)
Equity securities, Gross realized gains excluding OTTI	19	10	63	43
Equity securities, Gross realized losses excluding OTTI	(12)	(5)	(17)	(7)
Equity Securities Net Realized Gains Losses Total	6	2	39	32
Other Than Temporary Impairment on Other Investment	(4)	(1)	(7)	(1)
Foreign exchange gains (losses)	29	(2)	46	(73)
Investment and embedded derivative instruments	1	(22)	(85)	6
Fair value adjustments on insurance derivative	89	(396)	(270)	(337)
S&P put options and futures	(45)	83	(88)	69
Other derivative instruments	3	(9)	1	(10)
Other	(6)	(1)	10	4
Total net realized gains (losses) (includes $33, $(49), $(117), and $(18) reclassified from AOCI)	$ 100	$ (397)	$ (510)	$ (360)

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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 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	$ 51	$ 23	$ 53	$ 28
Additions where no OTTI was previously recorded	4	8	16	15
Additions where an OTTI was previously recorded	1	6	13	8
Reductions for securities sold during the period	(11)	(5)	(37)	(19)
Balance of credit losses related to securities still held – end of period	$ 45	$ 32	$ 45	$ 32

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	Sep. 30, 2016	Dec. 31, 2015
Investment [Line Items]
Fair Value, 0-12 Months	$ 8,106	$ 16,763
Gross Unrealized Loss, 0-12 Months	(97)	(601)
Fair Value, Over 12 Months	1,501	1,885
Gross Unrealized Loss, Over 12 Months	(76)	(226)
Total Fair Value	9,607	18,648
Total Gross Unrealized Loss	(173)	(827)
U.S. Treasury And Agency [Member]
Investment [Line Items]
Fair Value, 0-12 Months	436	996
Gross Unrealized Loss, 0-12 Months	(2)	(5)
Fair Value, Over 12 Months	0	153
Gross Unrealized Loss, Over 12 Months	0	(1)
Total Fair Value	436	1,149
Total Gross Unrealized Loss	(2)	(6)
Foreign [Member]
Investment [Line Items]
Fair Value, 0-12 Months	1,899	3,953
Gross Unrealized Loss, 0-12 Months	(20)	(148)
Fair Value, Over 12 Months	409	436
Gross Unrealized Loss, Over 12 Months	(28)	(73)
Total Fair Value	2,308	4,389
Total Gross Unrealized Loss	(48)	(221)
Corporate [Member]
Investment [Line Items]
Fair Value, 0-12 Months	1,559	7,518
Gross Unrealized Loss, 0-12 Months	(21)	(371)
Fair Value, Over 12 Months	750	738
Gross Unrealized Loss, Over 12 Months	(45)	(138)
Total Fair Value	2,309	8,256
Total Gross Unrealized Loss	(66)	(509)
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Fair Value, 0-12 Months	1,039	3,399
Gross Unrealized Loss, 0-12 Months	(3)	(42)
Fair Value, Over 12 Months	292	516
Gross Unrealized Loss, Over 12 Months	(2)	(12)
Total Fair Value	1,331	3,915
Total Gross Unrealized Loss	(5)	(54)
States, Municipalities, And Political Subdivisions [Member]
Investment [Line Items]
Fair Value, 0-12 Months	2,807	556
Gross Unrealized Loss, 0-12 Months	(10)	(6)
Fair Value, Over 12 Months	50	42
Gross Unrealized Loss, Over 12 Months	(1)	(2)
Total Fair Value	2,857	598
Total Gross Unrealized Loss	(11)	(8)
Fixed Maturities [Member]
Investment [Line Items]
Fair Value, 0-12 Months	7,740	16,422
Gross Unrealized Loss, 0-12 Months	(56)	(572)
Fair Value, Over 12 Months	1,501	1,885
Gross Unrealized Loss, Over 12 Months	(76)	(226)
Total Fair Value	9,241	18,307
Total Gross Unrealized Loss	(132)	(798)
Equity Securities [Member]
Investment [Line Items]
Fair Value, 0-12 Months	133	131
Gross Unrealized Loss, 0-12 Months	(14)	(18)
Fair Value, Over 12 Months	0	0
Gross Unrealized Loss, Over 12 Months	0	0
Total Fair Value	133	131
Total Gross Unrealized Loss	(14)	(18)
Other Long-term Investments [Member]
Investment [Line Items]
Fair Value, 0-12 Months	233	210
Gross Unrealized Loss, 0-12 Months	(27)	(11)
Fair Value, Over 12 Months	0	0
Gross Unrealized Loss, Over 12 Months	0	0
Total Fair Value	233	210
Total Gross Unrealized Loss	$ (27)	$ (11)

Investments (Schedule Of Compon

Investments (Schedule Of Components Of Restricted Assets) (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Trust funds	$ 13,093	$ 11,862
Deposits with non-U.S. regulatory authorities	2,338	2,075
Deposits with U.S. regulatory authorities	2,232	1,242
Assets pledged under repurchase agreements	1,464	1,459
Other pledged assets	433	392
Total restricted assets	$ 19,560	$ 17,030

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Fair Value Measurements Of Financial Instruments [Line Items]
Other Long-term Investments	$ 4,400		$ 4,400		$ 3,291
Fair Value, Level 1 to Level 2 transfers, Amount	0	$ 0	0	$ 0
Fair Value, Level 2 to Level 1 Transfers, Amount	0	$ 0	$ 0	$ 0
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
Equity Option [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Derivative Asset, Fair Value, Gross Liability	$ 0		$ 0

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	$ 81,358	$ 43,587
Equity securities, at fair value	803	497
Other investments (cost – $4,170 and $2,993)	4,400	3,291
Securities lending collateral	1,140	1,046
Other Other investment [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Other investments (cost – $4,170 and $2,993)	25	25
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Other investments (cost – $4,170 and $2,993)	3,498	2,477
Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	81,358	43,587
Equity securities, at fair value	803	497
Short-term investments	3,548	10,446
Other investments (cost – $4,170 and $2,993)	877	789
Securities lending collateral	1,140	1,046
Investment derivative instruments, assets	20	12
Other Derivative Instruments Fair Value	14
Separate Account Assets	1,840	1,552
Total assets measured at fair value	89,600	57,929
Investment derivative instruments, liabilities	34	13
Other derivative instruments, liability	8	10
GLB (2)	883	609
Total liabilities measured at fair value	925	632
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	755	284
Equity securities, at fair value	37	16
Short-term investments	62
Other investments (cost – $4,170 and $2,993)	223	212
Other Derivative Instruments Fair Value	0
Total assets measured at fair value	1,077	512
Other derivative instruments, liability	8	6
GLB (2)	883	609
Total liabilities measured at fair value	891	615
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	2,155	1,712
Equity securities, at fair value	766	481
Short-term investments	2,127	7,171
Other investments (cost – $4,170 and $2,993)	404	347
Investment derivative instruments, assets	20	12
Other Derivative Instruments Fair Value	14
Separate Account Assets	1,743	1,464
Total assets measured at fair value	7,229	11,187
Investment derivative instruments, liabilities	34	13
Other derivative instruments, liability		4
Total liabilities measured at fair value	34	17
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	78,448	41,591
Short-term investments	1,359	3,275
Other investments (cost – $4,170 and $2,993)	250	230
Securities lending collateral	1,140	1,046
Other Derivative Instruments Fair Value	0
Separate Account Assets	97	88
Total assets measured at fair value	81,294	46,230
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	2,708	2,528
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	2,155	1,712
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	553	816
Fair Value, Measurements, Recurring [Member] | Foreign [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	22,508	13,445
Fair Value, Measurements, Recurring [Member] | Foreign [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	103	57
Fair Value, Measurements, Recurring [Member] | Foreign [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	22,405	13,388
Fair Value, Measurements, Recurring [Member] | Corporate [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	23,773	14,929
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	606	174
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	23,167	14,755
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	13,461	9,958
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	46	53
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	13,415	9,905
Fair Value, Measurements, Recurring [Member] | States, Municipalities, And Political Subdivisions [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	18,908	2,727
Fair Value, Measurements, Recurring [Member] | States, Municipalities, And Political Subdivisions [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	18,908	2,727
Guaranteed Minimum Income Benefit [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Guaranteed Benefit Liability, Net	$ 1,200	$ 888	$ 1,000	$ 615	$ 663

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value And Maximum Future Funding Commitments Related To Investments) (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 1,965	$ 824
Fair Value	$ 3,498	2,477
Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notice Period For Redemption For Alternative Investments Investment Funds	5 days
Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notice Period For Redemption For Alternative Investments Investment Funds	120 days
Financial [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 188	105
Fair Value	$ 549	$ 300
Financial [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Expected liquidation period of underlying assets	5 years	5 years
Financial [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Expected liquidation period of underlying assets	9 years	9 years
Real Assets [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 274	$ 140
Fair Value	$ 520	$ 474
Real Assets [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Expected liquidation period of underlying assets	3 years	3 years
Real Assets [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Expected liquidation period of underlying assets	7 years	7 years
Distressed [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 196	$ 218
Fair Value	$ 463	$ 261
Distressed [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Expected liquidation period of underlying assets	5 years	5 years
Distressed [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Expected liquidation period of underlying assets	9 years	9 years
Private Credit [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 294	$ 209
Fair Value	$ 241	$ 265
Private Credit [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Expected liquidation period of underlying assets	3 years	3 years
Private Credit [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Expected liquidation period of underlying assets	7 years	7 years
Traditional [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 999	$ 152
Fair Value	$ 1,458	$ 895
Traditional [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Expected liquidation period of underlying assets	3 years	3 years
Traditional [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Expected liquidation period of underlying assets	9 years	9 years
Vintage [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 14
Fair Value	$ 23	$ 13
Vintage [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Expected liquidation period of underlying assets	1 year	1 year
Vintage [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Expected liquidation period of underlying assets	2 years	2 years
Investment Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 244	$ 269

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations) (Detail) - USD ($) $ in Millions

9 Months Ended

Sep. 30, 2016

Jun. 30, 2016

[3]

Dec. 31, 2015

Sep. 30, 2015

[2],[3]

Jun. 30, 2015

[3]

Dec. 31, 2014

[3]

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

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 Minimum Income Benefit [Member]

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value

$ 883

[2]

$ 971

$ 609

[3]

$ 744

$ 347

$ 406

Fair Value, Inputs, Level 3 [Member] | Guaranteed Minimum Income Benefit [Member]

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value

$ 883

[3]

$ 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.

[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 $1.0 billion at September 30, 2015, and $615 million at June 30, 2015, which includes a fair value derivative adjustment of $744 million and $347 million, respectively. Assets Liabilities Nine Months EndedAvailable-for-Sale Debt Securities EquitysecuritiesShort-term investmentsOtherinvestments OtherderivativeinstrumentsGLB(1)September 30, 2016Foreign Corporatesecurities MBS (in millions of U.S. dollars) Balance–Beginning of Period$57 $174 $53 $16$—$212 $6$609Transfers into Level 39 18 — ——— ——Transfers out of Level 3(2) — — ——— ——Change in Net Unrealized Gains (Losses) included in OCI8 17 — 2—4 ——Net Realized Gains/Losses(6) (12) — 1—— 2274Purchases (2)52 472 1 236222 2—Sales(10) (48) (8) (5)—— ——Settlements(5) (15) — ——(15) (2)—Balance–End of Period$103 $606 $46 $37$62$223 $8$883Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date$(5) $(11) $— $—$—$— $2$274(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 LiabilitiesNine Months Ended Available-for-Sale Debt Securities Other investments OtherderivativeinstrumentsGLB(1)September 30, 2015 Foreign Corporatesecurities MBS Equitysecurities (in millions of U.S. dollars) Balance–Beginning of Period $22 $187 $15 $2 $204 $4$406Transfers into Level 3 29 15 — — — ——Change in Net Unrealized Gains (Losses) included in OCI (1) 1 — 2 (7) ——Net Realized Gains/Losses (1) (4) — (2) — 3338Purchases 9 38 41 2 21 ——Sales (1) (10) (1) — — ——Settlements (4) (44) (1) — (9) ——Balance–End of Period $53$183$54 $4$209 $7$744Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $(1) $(2) $— $(2) $— $3$338(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 $1.0 billion at September 30, 2015, and $663 million at December 31, 2014, which includes a fair value derivative adjustment of $744 million and $406 million, respectively.

[3]

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 Measurements (Assets

Fair Value Measurements (Assets Measured At Fair Value Using Significant Unobservable Inputs) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Document Period End Date			Sep. 30, 2016
Foreign [Member] | Available-for-sale Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	$ 87	$ 56	$ 57	$ 22
Transfers Into Level 3, Asset	0	1	9	29
Transfers out of Level 3, Assets			(2)
Change in Net Unrealized Gains (Losses) included in OCI, Assets	1	(1)	8	(1)
Net Realized Gains/Losses, Assets	0	(1)	(6)	(1)
Purchases, Assets	20	0	52	9
Sales, Assets	(2)	0	(10)	(1)
Settlements, Assets	(1)	(4)	(5)	(4)
Balance-End of Period, Assets	103	53	103	53
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	0	(1)	(5)	(1)
Corporate [Member] | Available-for-sale Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	281	167	174	187
Transfers Into Level 3, Asset	0	2	18	15
Transfers out of Level 3, Assets			0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	(6)	(1)	17	1
Net Realized Gains/Losses, Assets	(4)	(1)	(12)	(4)
Purchases, Assets	348	22	472	38
Sales, Assets	(18)	(5)	(48)	(10)
Settlements, Assets	(7)	(3)	(15)	(44)
Balance-End of Period, Assets	606	183	606	183
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	(4)	0	(11)	(2)
Collateralized Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	49	55	53	15
Transfers Into Level 3, Asset	0	0	0	0
Transfers out of Level 3, Assets			0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	0	0	0	0
Net Realized Gains/Losses, Assets	0	0	0	0
Purchases, Assets	0	0	1	41
Sales, Assets	(3)	(1)	(8)	(1)
Settlements, Assets	0	0	0	(1)
Balance-End of Period, Assets	46	54	46	54
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	0	0	0	0
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	37	2	16	2
Transfers Into Level 3, Asset	0	0	0	0
Transfers out of Level 3, Assets			0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	(3)	(2)	2	2
Net Realized Gains/Losses, Assets	0	(1)	1	(2)
Purchases, Assets	0	1	23	2
Sales, Assets	(3)	0	(5)	0
Settlements, Assets	0	0	0	0
Balance-End of Period, Assets	37	4	37	4
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	0	(1)	0	(2)
Short-term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	50		0
Transfers Into Level 3, Asset	0		0
Transfers out of Level 3, Assets			0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	0		0
Net Realized Gains/Losses, Assets	0		0
Purchases, Assets	12		62
Sales, Assets	0		0
Settlements, Assets	0		0
Balance-End of Period, Assets	62		62
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	0		0
Other Long-term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	216	214	212	204
Transfers Into Level 3, Asset	0	0	0	0
Transfers out of Level 3, Assets			0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	(4)	7	4	(7)
Net Realized Gains/Losses, Assets	0	0	0	0
Purchases, Assets	8	5	22	21
Sales, Assets	0	0	0	0
Settlements, Assets	(5)	(3)	(15)	(9)
Balance-End of Period, Assets	223	209	223	209
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	$ 0	$ 0	$ 0	$ 0

Fair value measurements Fair Va

Fair value measurements Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015		Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Guaranteed Minimum Income Benefit [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Reported liabilities		$ 1,200	$ 1,000		$ 1,200		$ 1,000		$ 888	$ 615	$ 663
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance - Beginning of Period, Liabilities	[1]	971	347		609		406
Transfers into level 3, liability		0	0		0		0
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities		0	0		0		0
Net Realized Gains/Losses, Liabilities		(88)	397		274		338
Transfers out of Level 3, Liabilities					0
Purchases, Liabilities		0	0		0		0
Sales, Liabilities		0	0		0		0
Settlements, Liabilities		0	0		0		0
Balance - End of Period, Liabilities	[2]	883	744	[1]	883		744	[1]
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities		(88)	397		274	[2]	338	[2]
Guaranteed Minimum Income Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance - Beginning of Period, Liabilities					609
Balance - End of Period, Liabilities	[1]	883			883
Other Derivative Instruments Fair Value [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance - Beginning of Period, Liabilities		10	3		6		4
Transfers into level 3, liability			0		0		0
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities			0		0		0
Net Realized Gains/Losses, Liabilities		0	4		2		3
Transfers out of Level 3, Liabilities					0
Purchases, Liabilities		0	0		2		0
Sales, Liabilities			0		0		0
Settlements, Liabilities			0		2		0
Balance - End of Period, Liabilities		8	7		8		7
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities		$ 0	$ 4		$ 2		$ 3
[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 $1.0 billion at September 30, 2015, and $615 million at June 30, 2015, which includes a fair value derivative adjustment of $744 million and $347 million, respectively. Assets Liabilities Nine Months EndedAvailable-for-Sale Debt Securities EquitysecuritiesShort-term investmentsOtherinvestments OtherderivativeinstrumentsGLB(1)September 30, 2016Foreign Corporatesecurities MBS (in millions of U.S. dollars) Balance–Beginning of Period$57 $174 $53 $16$—$212 $6$609Transfers into Level 39 18 — ——— ——Transfers out of Level 3(2) — — ——— ——Change in Net Unrealized Gains (Losses) included in OCI8 17 — 2—4 ——Net Realized Gains/Losses(6) (12) — 1—— 2274Purchases (2)52 472 1 236222 2—Sales(10) (48) (8) (5)—— ——Settlements(5) (15) — ——(15) (2)—Balance–End of Period$103 $606 $46 $37$62$223 $8$883Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date$(5) $(11) $— $—$—$— $2$274(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 LiabilitiesNine Months Ended Available-for-Sale Debt Securities Other investments OtherderivativeinstrumentsGLB(1)September 30, 2015 Foreign Corporatesecurities MBS Equitysecurities (in millions of U.S. dollars) Balance–Beginning of Period $22 $187 $15 $2 $204 $4$406Transfers into Level 3 29 15 — — — ——Change in Net Unrealized Gains (Losses) included in OCI (1) 1 — 2 (7) ——Net Realized Gains/Losses (1) (4) — (2) — 3338Purchases 9 38 41 2 21 ——Sales (1) (10) (1) — — ——Settlements (4) (44) (1) — (9) ——Balance–End of Period $53$183$54 $4$209 $7$744Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $(1) $(2) $— $(2) $— $3$338(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 $1.0 billion at September 30, 2015, and $663 million at December 31, 2014, which includes a fair value derivative adjustment of $744 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	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	$ 11,366	$ 8,552
Repurchase agreements	1,406	1,404
Total liabilities	113,438	73,171
Long-term debt	12,621	9,389
Short-term debt	500	0
Trust preferred securities	308	307
Held-to-maturity Securities	10,927	8,430
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	628	583
Repurchase agreements	0	0
Total liabilities	0	0
Long-term Debt, Fair Value	0	0
Short-term Debt, Fair Value	0
Trust preferred securities	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	10,725	7,955
Repurchase agreements	1,406	1,404
Total liabilities	16,139	11,528
Long-term Debt, Fair Value	13,762	9,678
Short-term Debt, Fair Value	508
Trust preferred securities	463	446
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	13	14
Repurchase agreements	0	0
Total liabilities	0	0
Long-term Debt, Fair Value	0	0
Short-term Debt, Fair Value	0
Trust preferred securities	0	0
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	628	583
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	107	162
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Foreign [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Foreign [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	739	785
Foreign [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Corporate [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Corporate [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	2,968	3,042
Corporate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	13	14
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	1,579	1,743
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
States, Municipalities, And Political Subdivisions [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
States, Municipalities, And Political Subdivisions [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	5,332	2,223
States, Municipalities, And Political Subdivisions [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	11,366	8,552
Repurchase agreements	1,406	1,404
Total liabilities	16,139	11,528
Long-term Debt, Fair Value	13,762	9,678
Short-term Debt, Fair Value	508
Trust preferred securities	463	446
Estimate of Fair Value Measurement [Member] | U.S. Treasury And Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	735	745
Estimate of Fair Value Measurement [Member] | Foreign [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	739	785
Estimate of Fair Value Measurement [Member] | Corporate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	2,981	3,056
Estimate of Fair Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	1,579	1,743
Estimate of Fair Value Measurement [Member] | States, Municipalities, And Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	5,332	2,223
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Repurchase agreements	1,406	1,404
Total liabilities	14,835	11,100
Long-term debt	12,621	9,389
Short-term debt	500
Trust preferred securities	308	307
Held-to-maturity Securities	10,927	8,430
Reported Value Measurement [Member] | U.S. Treasury And Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	709	733
Reported Value Measurement [Member] | Foreign [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	694	763
Reported Value Measurement [Member] | Corporate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	2,852	3,054
Reported Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	1,507	1,707
Reported Value Measurement [Member] | States, Municipalities, And Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	$ 5,165	$ 2,173

Assumed Life Reinsurance Prog56

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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Net premiums earned	$ 7,688	$ 4,719	$ 21,690	$ 13,006
Policy benefits and other reserve adjustments	155	89	427	384
Net realized gains (losses)	100	(397)	(510)	(360)
Guaranteed Minimum Death Benefit [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Net premiums earned	15	15	42	47
Policy benefits and other reserve adjustments	11	5	34	25
Guaranteed Minimum Income Benefit [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Net premiums earned	28	30	88	92
Policy benefits and other reserve adjustments	9	15	24	34
Net realized gains (losses)	86	(397)	(285)	(338)
Loss recognized in Net income	105	(382)	(221)	(280)
Less: Net cash received	15	20	57	74
Net (increase) decrease in liability	$ 90	$ (402)	$ (278)	$ (354)

Assumed Life Reinsurance Prog57

Assumed Life Reinsurance Programs Involving Minimum Benefit Guarantees Under Annuity Contracts (Narrative) (Detail) - USD ($) $ in Millions

Sep. 30, 2016

Jun. 30, 2016

[2]

Dec. 31, 2015

Sep. 30, 2015

Jun. 30, 2015

Dec. 31, 2014

Guaranteed Minimum Death Benefit [Member]

Liabilities for Guarantees on Long-Duration Contracts [Line Items]

Reported liabilities

$ 119

$ 117

Guaranteed Minimum Income Benefit [Member]

Liabilities for Guarantees on Long-Duration Contracts [Line Items]

Reported liabilities

1,200

888

$ 1,000

$ 615

$ 663

Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value

883

[1]

$ 971

609

[2]

$ 744

[1],[2]

$ 347

[2]

$ 406

[2]

Fair Value, Inputs, Level 3 [Member] | Guaranteed Minimum Income Benefit [Member]

Liabilities for Guarantees on Long-Duration Contracts [Line Items]

Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value

$ 883

[2]

$ 609

[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 $1.0 billion at September 30, 2015, and $615 million at June 30, 2015, which includes a fair value derivative adjustment of $744 million and $347 million, respectively. Assets Liabilities Nine Months EndedAvailable-for-Sale Debt Securities EquitysecuritiesShort-term investmentsOtherinvestments OtherderivativeinstrumentsGLB(1)September 30, 2016Foreign Corporatesecurities MBS (in millions of U.S. dollars) Balance–Beginning of Period$57 $174 $53 $16$—$212 $6$609Transfers into Level 39 18 — ——— ——Transfers out of Level 3(2) — — ——— ——Change in Net Unrealized Gains (Losses) included in OCI8 17 — 2—4 ——Net Realized Gains/Losses(6) (12) — 1—— 2274Purchases (2)52 472 1 236222 2—Sales(10) (48) (8) (5)—— ——Settlements(5) (15) — ——(15) (2)—Balance–End of Period$103 $606 $46 $37$62$223 $8$883Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date$(5) $(11) $— $—$—$— $2$274(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 LiabilitiesNine Months Ended Available-for-Sale Debt Securities Other investments OtherderivativeinstrumentsGLB(1)September 30, 2015 Foreign Corporatesecurities MBS Equitysecurities (in millions of U.S. dollars) Balance–Beginning of Period $22 $187 $15 $2 $204 $4$406Transfers into Level 3 29 15 — — — ——Change in Net Unrealized Gains (Losses) included in OCI (1) 1 — 2 (7) ——Net Realized Gains/Losses (1) (4) — (2) — 3338Purchases 9 38 41 2 21 ——Sales (1) (10) (1) — — ——Settlements (4) (44) (1) — (9) ——Balance–End of Period $53$183$54 $4$209 $7$744Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $(1) $(2) $— $(2) $— $3$338(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 $1.0 billion at September 30, 2015, and $663 million at December 31, 2014, which includes a fair value derivative adjustment of $744 million and $406 million, respectively.

[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.

Goodwill and other intangible58

Goodwill and other intangible assets Schedule of Goodwill (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Jan. 14, 2016	Dec. 31, 2015
Goodwill [Line Items]
Other Intangible Assets, Net	$ 6,991		$ 887
Goodwill [Roll Forward]
Goodwill, beginning of period	4,796
Goodwill, Acquired During Period	10,530
Goodwill, Translation Adjustments	155
Goodwill, end of period	15,481
North America Commercial P&C Insurance [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	1,203
Goodwill, Acquired During Period	5,711
Goodwill, Translation Adjustments	43
Goodwill, end of period	6,957
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	2,794
Goodwill, Translation Adjustments	98
Goodwill, end of period	4,970
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 [Line Items]
Increase Decrease on Acquired Unpaid Losses and Loss Expenses		$ 715
The Chubb Corporation [Member] | Minimum [Member]
Goodwill [Line Items]
Amortization Period of Increase Decrease to Acquired Unpaid Losses and Loss Expenses	5 years
The Chubb Corporation [Member] | Maximum [Member]
Goodwill [Line Items]
Amortization Period of Increase Decrease to Acquired Unpaid Losses and Loss Expenses	17 years

Goodwill and other intangible59

Goodwill and other intangible assets Intangible Assets Acquiredd as part of Chubb acquisition (Details) - USD ($) $ in Millions	Jan. 14, 2016	Sep. 30, 2016
Acquired Indefinite-lived Intangible Assets [Line Items]
Total identified intangible assets acquired	$ 7,655
Internally developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life		3 years
Internally developed technology | The Chubb Corporation [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 95
Agency distribution relationships and renewal rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life		24 years
Agency distribution relationships and renewal rights [Member] | The Chubb Corporation [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 3,150
Unearned premium reserves [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life		1 year
Unearned premium reserves [Member] | The Chubb Corporation [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 1,550
Maximum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life		24 years
Minimum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life		1 year
Trademarks [Member] | The Chubb Corporation [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired		$ 2,800
Licensing Agreements [Member] | The Chubb Corporation [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired		50
Syndicate capacity [Member] | The Chubb Corporation [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired		$ 10

Goodwill and other intangible60

Goodwill and other intangible assets Intangible Assets (Estimated Amortization Expense Over the Next Five Years (Details) $ in Millions	Sep. 30, 2016USD ($)
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets Amortization Expense Next Three to Six Months	$ 3
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	252
Finite-Lived Intangible Assets, Amortization Expense, Year Two	327
Finite-Lived Intangible Assets, Amortization Expense, Year Three	285
Finite-Lived Intangible Assets, Amortization Expense, Year Four	263
Finite-Lived Intangible Assets, Amortization Expense, Year Five	250
FiniteLivedIntangibleAssetsAmortizationExpenseTotal	1,380
The Chubb Corporation [Member]
Finite-Lived Intangible Assets [Line Items]
Unearned Premium Reserves Amortization, Next Three to Six Months	144
Finite-Lived Intangible Assets Amortization Expense Next Three to Six Months	(20)
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	167
Finite-Lived Intangible Assets, Amortization Expense, Year Two	254
Finite-Lived Intangible Assets, Amortization Expense, Year Three	219
Finite-Lived Intangible Assets, Amortization Expense, Year Four	204
Finite-Lived Intangible Assets, Amortization Expense, Year Five	197
FiniteLivedIntangibleAssetsAmortizationExpenseTotal	1,021
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 to Six Months	33
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	296
Finite-Lived Intangible Assets, Amortization Expense, Year Two	324
Finite-Lived Intangible Assets, Amortization Expense, Year Three	281
Finite-Lived Intangible Assets, Amortization Expense, Year Four	240
Finite-Lived Intangible Assets, Amortization Expense, Year Five	217
FiniteLivedIntangibleAssetsAmortizationExpenseTotal	1,391
Internally Developed Technology [Member] | The Chubb Corporation [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets Amortization Expense Next Three to Six 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	72
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 to Six Months	(61)
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	(161)
Finite-Lived Intangible Assets, Amortization Expense, Year Two	(102)
Finite-Lived Intangible Assets, Amortization Expense, Year Three	(62)
Finite-Lived Intangible Assets, Amortization Expense, Year Four	(36)
Finite-Lived Intangible Assets, Amortization Expense, Year Five	(20)
FiniteLivedIntangibleAssetsAmortizationExpenseTotal	(442)
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets Amortization Expense Next Three to Six Months	23
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	85
Finite-Lived Intangible Assets, Amortization Expense, Year Two	73
Finite-Lived Intangible Assets, Amortization Expense, Year Three	66
Finite-Lived Intangible Assets, Amortization Expense, Year Four	59
Finite-Lived Intangible Assets, Amortization Expense, Year Five	53
FiniteLivedIntangibleAssetsAmortizationExpenseTotal	$ 359

Debt (Details)

Debt (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Jan. 14, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt	$ 12,621		$ 9,389
Repurchase agreements	1,406		1,404
The Chubb Corporation [Member]
Debt Instrument [Line Items]
Long-term debt		$ 3,765
Debt Instrument, Face Amount		$ 3,300
Chubb INA $1,000 million 6.375% capital securities due March 2067(1)
Debt Instrument [Line Items]
Debt Instrument, Face Amount	1,000
Junior Subordinated Debt [Member] | Chubb INA $1,000 million 6.375% capital securities due March 2067(1)
Debt Instrument [Line Items]
Long-term debt	961		$ 0
Debt Instrument, Face Amount	$ 1,000
Interest Rate	6.375%
London Interbank Offered Rate (LIBOR) [Member] | Junior Subordinated Debt [Member] | Chubb INA $1,000 million 6.375% capital securities due March 2067(1)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%

Debt (Schedule of Debt Outstand

Debt (Schedule of Debt Outstanding) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Jan. 14, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Repurchase agreements	$ 1,406		$ 1,404
Short-term debt	500		0
Long-term debt	12,621		9,389
Trust preferred securities	308		307
Chubb INA $1,000 million 6.375% capital securities due March 2067(1)
Debt Instrument [Line Items]
Debt Instrument, Face Amount	1,000
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	12,621		9,389
Senior Notes [Member] | INA Senior Notes Due February 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500
Short-term debt	$ 500		0
Interest Rate	5.70%
Long-term debt	$ 0		500
Make Whole Premium Additional Percent	0.20%
Senior Notes [Member] | INA Senior Notes Due March 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 300
Interest Rate	5.80%
Long-term debt	$ 300		299
Make Whole Premium Additional Percent	0.35%
Senior Notes [Member] | Chubb INA Senior Notes Due May 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 600
Interest Rate	5.75%
Long-term debt	$ 641		0
Make Whole Premium Additional Percent	0.30%
Senior Notes [Member] | INA Senior Notes Due June 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500
Interest Rate	5.90%
Long-term debt	$ 498		497
Make Whole Premium Additional Percent	0.40%
Senior Notes [Member] | INA Senior Notes Due November 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,300
Interest Rate	2.30%
Long-term debt	$ 1,294		1,294
Make Whole Premium Additional Percent	0.15%
Senior Notes [Member] | INA Senior Notes Due November 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,000
Interest Rate	2.875%
Long-term debt	$ 994		994
Make Whole Premium Additional Percent	0.20%
Senior Notes [Member] | INA Senior Notes Due March 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 475
Interest Rate	2.70%
Long-term debt	$ 471		471
Make Whole Premium Additional Percent	0.10%
Senior Notes [Member] | INA Senior Notes Due May 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 700
Interest Rate	3.35%
Long-term debt	$ 694		694
Make Whole Premium Additional Percent	0.15%
Senior Notes [Member] | INA Senior Notes Due March 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 800
Interest Rate	3.15%
Long-term debt	$ 794		794
Make Whole Premium Additional Percent	0.15%
Senior Notes [Member] | INA Senior Notes Due May 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,500
Interest Rate	3.35%
Long-term debt	$ 1,488		1,487
Make Whole Premium Additional Percent	0.20%
Senior Notes [Member] | INA Senior Notes Due May 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 300
Interest Rate	6.70%
Long-term debt	$ 297		297
Make Whole Premium Additional Percent	0.20%
Senior Notes [Member] | $800 million 6.0% due May 2037
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 800
Interest Rate	6.00%
Long-term debt	$ 982		0
Make Whole Premium Additional Percent	0.20%
Senior Notes [Member] | $600 million 6.5% due May 2038
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 600
Interest Rate	6.50%
Long-term debt	$ 778		0
Make Whole Premium Additional Percent	0.30%
Senior Notes [Member] | INA Senior Notes Due March 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 475
Interest Rate	4.15%
Long-term debt	$ 469		469
Make Whole Premium Additional Percent	0.15%
Senior Notes [Member] | INA Senior Notes Due November 2045 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,500
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 $1,000 million 6.375% capital securities due March 2067(1)
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,000
Interest Rate	6.375%
Long-term debt	$ 961		0
Debentures Subject to Mandatory Redemption [Member] | Chubb INA Senior Notes Due August 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 100
Interest Rate	6.60%
Long-term debt	$ 109		0
Debentures Subject to Mandatory Redemption [Member] | INA Senior Notes Due August 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 100
Interest Rate	8.875%
Long-term debt	$ 100		100
Unsecured Debt [Member] | Chubb INA Senior Notes Due 2031 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 200
Interest Rate	6.80%
Long-term debt	$ 258		0
Make Whole Premium Additional Percent	0.25%
Trust Preferred Securities [Member] | INA Capital Securities Due April 2030 [Member]
Debt Instrument [Line Items]
Trust preferred securities	$ 308		307
Repurchase Agreements [Member]
Debt Instrument [Line Items]
Repurchase agreements	$ 1,406		$ 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 $1,000 million 6.375% capital securities due March 2067(1)
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 $1,000 million 6.375% capital securities due March 2067(1)
Debt Instrument [Line Items]
Make Whole Premium Additional Percent	0.50%
The Chubb Corporation [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 3,300
Long-term debt		$ 3,765
The Chubb Corporation [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest Rate		2.30%
The Chubb Corporation [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest Rate		4.35%

Commitments, Contingencies, A63

Commitments, Contingencies, And Guarantees (Narrative) (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities lending collateral	$ 1,140	$ 1,046
Carrying value of limited partnerships and partially-owned investment companies included in other investments	3,300
Funding commitments relating to limited partnerships and partially-owned investment companies	2,000
Unrecognized tax benefits	17
Derivative liability subject to a master netting agreement	9	$ 1
Purchase Commitment, Remaining Minimum Amount Committed	788
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	449
U.S. Treasury And Agency [Member] | Overnight and Continuous [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities lending collateral	53
Corporate [Member] | Overnight and Continuous [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities lending collateral	4
Equity Option [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Derivative Asset, Fair Value, Gross Liability	$ 0

Commitments, Contingencies, A64

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		Sep. 30, 2016	Dec. 31, 2015
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		$ 2,025	$ 1,029
Cross Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		0	0
Fair Value, Asset		0	0
Notional Value/Payment Provision		95	95
Options/Futures contracts on bonds and equities
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		1,353	751
Convertibles and Bonds with Warrants Attached [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		8	40	[1]
Investment And Embedded Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		25	43
Notional Value/Payment Provision		3,481	1,915
Single-Stock Future [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[2]	1,275	1,197
Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		243	15
Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		1,518	1,212
Guaranteed Living Benefits [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[3]	1,436	1,155
Equity Option [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		0
Other Assets [Member] | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Fair Value, Asset		10	7
Other Assets [Member] | Options/Futures contracts on bonds and equities
Derivatives, Fair Value [Line Items]
Fair Value, Asset		10	5
Other Assets [Member] | Single-Stock Future [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset	[2]	4	0
Other Assets [Member] | Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		10	0
Other Assets [Member] | Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		14	0
Other Assets [Member] | Guaranteed Living Benefits [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset	[3]	0	0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(32)	(11)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Options/Futures contracts on bonds and equities
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(2)	(2)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Convertibles and Bonds with Warrants Attached [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		0	0	[1]
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Investment And Embedded Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(34)	(13)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Single-Stock Future [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability	[2]	0	(4)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(8)	(6)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(8)	(10)
Fixed Maturities Available For Sale [Member] | Convertibles and Bonds with Warrants Attached [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		5	31	[1]
Accounts Payable Future Policy Benefits [Member] | Guaranteed Living Benefits [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability	[3]	$ (1,166)	$ (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, a65

Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Transactions accounted for as secured borrowings) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	$ 1,140	$ 1,046
Securities lending payable	1,141	$ 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	449
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	53
Foreign Government Debt [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	324
Corporate [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	4
Collateralized Mortgage Backed Securities [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	38
Equity Securities [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	$ 272

Commitments, contingencies, a66

Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 1,406	$ 1,404
Assets pledged under repurchase agreements	1,464	1,459
Securities lending collateral	1,140	1,046
Securities lending payable	1,141	$ 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	237
Collateralized Mortgage Backed Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	1,227
Repurchase Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Secured Borrowings, Gross, Difference, Amount	58
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	449
Overnight and Continuous [Member] | Corporate [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	4
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	53
Overnight and Continuous [Member] | Collateralized Mortgage Backed Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	38
Maturity Less than 30 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	413
Maturity Less than 30 Days [Member] | U.S. Treasury And Agency [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	5
Maturity Less than 30 Days [Member] | Collateralized Mortgage Backed Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	408
Maturity 30 to 90 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	484
Maturity 30 to 90 Days [Member] | U.S. Treasury And Agency [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	0
Maturity 30 to 90 Days [Member] | Collateralized Mortgage Backed Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	484
Maturity Greater than 90 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	567
Maturity Greater than 90 Days [Member] | U.S. Treasury And Agency [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	232
Maturity Greater than 90 Days [Member] | Collateralized Mortgage Backed Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	$ 335

Commitments, Contingencies, A67

Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative		$ 48	$ (344)	$ (442)	$ (272)
Foreign currency forward contracts
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative		(10)	15	(30)	30
All Other Futures Contracts And Options [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative		8	(23)	(63)	(10)
Convertibles and Bonds with Warrants Attached [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative	[1]	3	(14)	8	(14)
Investment And Embedded Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative		1	(22)	(85)	6
Guaranteed Living Benefits [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative	[2]	89	(396)	(270)	(337)
Single-Stock Future [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative	[3]	(45)	84	(88)	71
Options On Equity Market Indices [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative	[3]	0	(1)	0	(2)
Guaranteed Living Benefit And Other Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative		47	(322)	(357)	(278)
Other Derivatives [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative		$ 3	$ (9)	$ 1	$ (10)
[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.

Shareholders' equity Sharehol68

Shareholders' equity Shareholders' equity (Details) $ / shares in Units, $ in Millions

1 Months Ended

3 Months Ended

9 Months Ended

May 31, 2016$ / shares

May 31, 2015$ / shares

May 31, 2014$ / shares

Sep. 30, 2016$ / sharesSFr / sharesshares

Sep. 30, 2016SFr / sharesshares

Sep. 30, 2015USD ($)$ / shares

Sep. 30, 2015SFr / shares

Sep. 30, 2016$ / sharesSFr / sharesshares

Sep. 30, 2016SFr / sharesshares

Sep. 30, 2015USD ($)$ / sharesshares

Sep. 30, 2015SFr / shares

Jan. 01, 2016USD ($)

Dec. 31, 2015SFr / sharesshares

Jan. 01, 2015USD ($)

Equity, Class of Treasury Stock [Line Items]

Common Shares, par value | SFr / shares

SFr 24.15

SFr 24.15

SFr 24.15

SFr 24.15

SFr 24.15

Common Stock, Dividend Rate, Per-Dollar-Amount Approved by Shareholders | $ / shares

$ 0.69

$ 0.67

$ 0.65

Dividends declared per common share | (per share)

SFr 0.69

SFr 0.67

$ 0.67

SFr 0.65

SFr 2.05

SFr 2.01

$ 1.99

SFr 1.89

Common Shares in treasury, shares | shares

14,497,754

14,497,754

14,497,754

14,497,754

18,268,971

Annual dividend per share approved by shareholders | $ / shares

$ 2.76

$ 2.68

$ 2.60

Common Stock [Member]

Equity, Class of Treasury Stock [Line Items]

Dividends declared per common share | (per share)

SFr 0

SFr 0

0

0

SFr 0

SFr 0

0.65

0.62

Additional Paid-in Capital [Member]

Equity, Class of Treasury Stock [Line Items]

Dividends declared per common share | (per share)

SFr 0.69

SFr 0.67

$ 0.67

SFr 0.65

SFr 2.05

SFr 2.01

$ 1.34

SFr 1.27

2015 Stock Repurchase Plan [Member]

Equity, Class of Treasury Stock [Line Items]

Common Shares repurchased

$ 0

$ 734

Repurchase of outstanding common shares, shares | shares

6,677,663

Authorized amount of share repurchase program

$ 1,500

2016 Stock Repurchase Plan [Member]

Equity, Class of Treasury Stock [Line Items]

Authorized amount of share repurchase program

$ 0

Share-Based Compensation (Detai

Share-Based Compensation (Detail) - USD ($) $ / shares in Units, $ in Millions	Feb. 25, 2016	Jan. 14, 2016	Sep. 30, 2016	May 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be issued				19,500,000
The Chubb Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period in years			3 years
Award term period in years			10 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]
Award vesting period in years			3 years
Award term period in years			10 years
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]
Award 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]
Award vesting period in years			4 years
Restricted stock awards granted to employees and officers of the company	452,820

Postretirement benefits (Detail

Postretirement benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Jan. 14, 2016
Defined Benefit Plan Disclosure [Line Items]
Contributions During Current Period	$ 24		$ 156
Expected Contribution For Remainder of Year			8
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	26	$ 2	72	$ 5
Interest Cost	34	5	104	15
Expected Return on Plan Assets	(52)	(7)	(151)	(21)
Amortization of Actuarial (Gain) Loss	0	0	2	2
Curtailments	(4)		(4)
Settlements	(1)		(1)
Net Periodic Benefit Cost	3	0	22	1
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] | Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	6	2	15	5
Interest Cost	8	5	24	15
Expected Return on Plan Assets	(10)	(7)	(30)	(21)
Amortization of Actuarial (Gain) Loss	0	0	2	2
Curtailments	0		0
Settlements	0		0
Net Periodic Benefit Cost	4	0	$ 11	1
Discount Rate			3.74%		3.51%
Rate of Compensation Increase			3.40%		3.09%
Expected Long-term Rate of Return on Plan Assets Assumption			4.90%		4.81%
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)
Pension Plan [Member] | U.S.
Defined Benefit Plan Disclosure [Line Items]
Service Cost	20	0	$ 57	0
Interest Cost	26	0	80	0
Expected Return on Plan Assets	(42)	0	(121)	0
Amortization of Actuarial (Gain) Loss	0	0	0	0
Curtailments	(4)		(4)
Settlements	(1)		(1)
Net Periodic Benefit Cost	(1)	$ 0	$ 11	$ 0
Discount Rate			4.28%
Rate of Compensation Increase			4.00%
Expected Long-term Rate of Return on Plan Assets Assumption			7.00%
Pension Plan [Member] | U.S. | 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)
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	4		$ 9
Interest Cost	4		13
Expected Return on Plan Assets	(3)		(7)
Amortization of Actuarial (Gain) Loss			0
Curtailments	0		0
Settlements	0		0
Net Periodic Benefit Cost	5		15
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] | Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	0		1
Interest Cost	0		0
Expected Return on Plan Assets	0		0
Amortization of Actuarial (Gain) Loss	0		0
Curtailments	0		0
Settlements	0		0
Net Periodic Benefit Cost	0		$ 1
Discount Rate			4.30%
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)
Other Postretirement Benefit Plan [Member] | U.S.
Defined Benefit Plan Disclosure [Line Items]
Service Cost	4		$ 8
Interest Cost	4		13
Expected Return on Plan Assets	(3)		(7)
Amortization of Actuarial (Gain) Loss	0		0
Curtailments	0		0
Settlements	0		0
Net Periodic Benefit Cost	$ 5		$ 14
Discount Rate			4.41%
Expected Long-term Rate of Return on Plan Assets Assumption			7.00%
Other Postretirement Benefit Plan [Member] | U.S. | 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)

Segment Information (Operations

Segment Information (Operations By Segment) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net premiums written	$ 7,573	$ 4,709	$ 21,207	$ 13,569
Net premiums earned	7,688	4,719	21,690	13,006
Losses and loss expenses	4,269	2,643	12,197	7,182
Policy benefits	155	89	427	384
Policy acquisition costs	1,514	771	4,487	2,205
Administrative expenses	772	568	2,373	1,700
Underwriting income (loss)	978	648	2,206	1,535
Net investment income	739	549	2,121	1,662
Other (income) expense	(91)	12	(92)	(61)
Amortization of purchased intangibles	4	51	16	136
Segment Income (loss)	1,804	1,134	4,403	3,122
Net realized gains including OTTI	100	(397)	(510)	(360)
Interest expense	152	68	451	207
Chubb integration expenses	115	9	361	9
Income tax expense	277	132	556	395
Net income	1,360	528	2,525	2,151
Gain (Loss) on Derivative	48	(344)	(442)	(272)
North America Commercial P&C Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	3,110	1,433	8,657	4,158
Net premiums earned	3,086	1,410	9,130	4,209
Losses and loss expenses	1,863	913	5,581	2,744
Policy acquisition costs	522	142	1,549	403
Administrative expenses	275	154	840	459
Underwriting income (loss)	426	201	1,160	603
Net investment income	477	260	1,371	780
Other (income) expense	3	(3)	(6)	(5)
Amortization of purchased intangibles	0	0	0	0
Segment Income (loss)	900	464	2,537	1,388
North America Personal P&C Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	1,011	278	3,113	958
Net premiums earned	1,081	272	3,245	687
Losses and loss expenses	594	179	1,916	446
Policy acquisition costs	229	13	747	43
Administrative expenses	89	36	275	89
Underwriting income (loss)	169	44	307	109
Net investment income	53	7	155	19
Other (income) expense	2	1	6	1
Amortization of purchased intangibles	4	31	16	63
Segment Income (loss)	216	19	440	64
North America Agricultural Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	849	737	1,288	1,204
Net premiums earned	819	739	1,169	1,124
Losses and loss expenses	683	620	937	913
Policy acquisition costs	48	42	77	61
Administrative expenses	1	0	(1)	3
Underwriting income (loss)	87	77	156	147
Net investment income	5	5	15	17
Other (income) expense	0	(1)	0	1
Amortization of purchased intangibles	7	8	22	22
Segment Income (loss)	85	75	149	141
Management North America Agricultural Insurance segment income	90
Overseas General Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	1,940	1,584	6,012	5,047
Net premiums earned	2,034	1,615	6,082	4,896
Losses and loss expenses	843	674	2,953	2,304
Policy acquisition costs	546	405	1,586	1,190
Administrative expenses	261	246	801	756
Underwriting income (loss)	384	290	742	646
Net investment income	152	132	445	409
Other (income) expense	(6)	(6)	(16)	(12)
Amortization of purchased intangibles	12	12	36	50
Segment Income (loss)	530	416	1,167	1,017
Global Reinsurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	131	185	562	719
Net premiums earned	156	203	543	649
Losses and loss expenses	49	20	225	191
Policy acquisition costs	42	52	142	166
Administrative expenses	12	12	40	37
Underwriting income (loss)	53	119	136	255
Net investment income	67	76	199	230
Other (income) expense	0	(4)	(3)	(5)
Amortization of purchased intangibles	0	0	0	0
Segment Income (loss)	120	199	338	490
Life Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	532	492	1,575	1,483
Net premiums earned	512	480	1,521	1,441
Losses and loss expenses	174	153	498	442
Policy benefits	155	89	427	384
Policy acquisition costs	127	117	386	342
Administrative expenses	77	74	226	221
Underwriting income (loss)	(21)	47	(16)	52
Net investment income	71	66	207	198
Other (income) expense	(20)	48	(14)	32
Amortization of purchased intangibles	1	0	2	1
Segment Income (loss)	69	65	203	217
Management Underwriting Income (Loss)	72
Gains Losses On Fair Value Changes In Separate Account Assets	22
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Losses and loss expenses	63	84	87	142
Policy acquisition costs		0		0
Administrative expenses	57	46	192	135
Underwriting income (loss)	(120)	(130)	(279)	(277)
Net investment income	(86)	3	(271)	9
Other (income) expense	(70)	(23)	(59)	(73)
Amortization of purchased intangibles	(20)	0	(60)	0
Segment Income (loss)	(116)	(104)	(431)	(195)
Net realized gains including OTTI	100	(397)	(510)	(360)
Interest expense	152	68	451	207
Chubb integration expenses	115	9	361	9
Income tax expense	277	132	556	395
Net income	(560)	$ (710)	$ (2,309)	$ (1,166)
Commodity [Member] | North America Agricultural Insurance [Member]
Segment Reporting Information [Line Items]
Gain (Loss) on Derivative	$ 3

Earnings Per Share (Detail)

Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 1,360	$ 528	$ 2,525	$ 2,151
Weighted-average shares outstanding	468,021,093	324,210,936	460,631,794	325,904,502
Share-based compensation plans	3,375,269	2,962,484	3,439,017	3,269,724
Weighted-average shares outstanding and assumed conversions	471,396,362	327,173,420	464,070,811	329,174,226
Basic earnings per share (US$ per share)	$ 2.90	$ 1.63	$ 5.48	$ 6.60
Diluted earnings per share (US$ per share)	$ 2.88	$ 1.62	$ 5.44	$ 6.53
Potential anti-dilutive share conversions	1,306,710	1,907,815	1,635,337	1,503,830

Information provided in conne73

Information provided in connection with outstanding debt of subsidiaries Information provided in connection with outstanding debt of subsidiaries (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Jan. 14, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Equity Method Investment, Ownership Percentage	100.00%
Long-term debt	$ 12,621		$ 9,389
The Chubb Corporation [Member]
Debt Instrument [Line Items]
Intercompany Loan Agreements		$ 10,000
Debt Instrument, Face Amount		3,300
Long-term debt		$ 3,765
Weighted Average Interest Rate		3.30%
Minimum [Member] | The Chubb Corporation [Member]
Debt Instrument [Line Items]
Interest Rate		2.30%
Maximum [Member] | The Chubb Corporation [Member]
Debt Instrument [Line Items]
Interest Rate		4.35%

Information Provided In Conne74

Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Detail) - USD ($) $ in Millions	Sep. 30, 2016		Dec. 31, 2015		Sep. 30, 2015		Dec. 31, 2014	[4]
Condensed Financial Statements, Captions [Line Items]
Investments	$ 101,036		$ 66,251
Cash	870	[1],[2]	1,775	[1],[3]	$ 1,038	[4]	$ 655
Insurance and reinsurance balances receivable	8,493		5,323
Reinsurance recoverable on losses and loss expenses	13,448		11,386
Reinsurance recoverable on policy benefits	195		187
Value of business acquired	368		395
Goodwill and other intangible assets	22,472		5,683
Investments in subsidiaries	0		0
Due from subsidiaries and affiliates, net	0		0
Other assets	14,928		11,306
Total assets	161,810		102,306
Unpaid losses and loss expenses	61,347		37,303
Unearned premiums	15,054		8,439
Future policy benefits	5,010		4,807
Due to subsidiaries and affiliates, net	0		0
Repurchase agreements	1,406		1,404
Short-term debt	500		0
Affiliated notional cash pooling programs	0		0
Long-term debt	12,621		9,389
Trust preferred securities	308		307
Other liabilities	17,192		11,522
Total liabilities	113,438		73,171
Total shareholders' equity	48,372		29,135		29,127
Total liabilities and shareholders’ equity	161,810		102,306
Consolidating Adjustments and Eliminations
Condensed Financial Statements, Captions [Line Items]
Investments	0		0
Cash	(1,296)	[1],[2]	(971)	[1],[3]	(1,161)	[4]	(555)
Insurance and reinsurance balances receivable	(2,899)		(752)
Reinsurance recoverable on losses and loss expenses	(10,194)		(8,738)
Reinsurance recoverable on policy benefits	(972)		(942)
Value of business acquired	0		0
Goodwill and other intangible assets	0		0
Investments in subsidiaries	(88,719)		(47,998)
Due from subsidiaries and affiliates, net	(11,186)		(2,444)
Other assets	(4,299)		(3,593)
Total assets	(119,565)		(65,438)
Unpaid losses and loss expenses	(9,535)		(8,187)
Unearned premiums	(3,719)		(1,804)
Future policy benefits	(972)		(942)
Due to subsidiaries and affiliates, net	(11,186)		(2,444)
Repurchase agreements	0		0
Short-term debt	0
Affiliated notional cash pooling programs	(1,296)	[2]	(971)	[3]
Long-term debt	0		0
Trust preferred securities	0		0
Other liabilities	(4,138)		(3,092)
Total liabilities	(30,846)		(17,440)
Total shareholders' equity	(88,719)		(47,998)
Total liabilities and shareholders’ equity	(119,565)		(65,438)
Chubb Limited (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Investments	25		28
Cash	6	[1],[2]	1	[1],[3]	17	[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 and other intangible assets	0		0
Investments in subsidiaries	38,403		29,612
Due from subsidiaries and affiliates, net	11,186		644
Other assets	5		8
Total assets	49,625		30,293
Unpaid losses and loss expenses	0		0
Unearned premiums	0		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	927	[2]	882	[3]
Long-term debt	0		0
Trust preferred securities	0		0
Other liabilities	326		276
Total liabilities	1,253		1,158
Total shareholders' equity	48,372		29,135
Total liabilities and shareholders’ equity	49,625		30,293
Chubb INA Holdings Inc (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Investments	812		7,839
Cash	2	[1],[2]	2	[1],[3]	5	[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 and other intangible assets	0		0
Investments in subsidiaries	50,316		18,386
Due from subsidiaries and affiliates, net	0		1,800
Other assets	366		457
Total assets	51,496		28,484
Unpaid losses and loss expenses	0		0
Unearned premiums	0		0
Future policy benefits	0		0
Due to subsidiaries and affiliates, net	10,996		0
Repurchase agreements	0		0
Short-term debt	500
Affiliated notional cash pooling programs	369	[2]	89	[3]
Long-term debt	12,610		9,378
Trust preferred securities	308		307
Other liabilities	1,588		1,422
Total liabilities	26,371		11,196
Total shareholders' equity	25,125		17,288
Total liabilities and shareholders’ equity	51,496		28,484
Other Chubb Limited Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Investments	100,199		58,384
Cash	2,158	[1],[2]	2,743	[1],[3]	$ 2,177	[4]	$ 1,209
Insurance and reinsurance balances receivable	11,392		6,075
Reinsurance recoverable on losses and loss expenses	23,642		20,124
Reinsurance recoverable on policy benefits	1,167		1,129
Value of business acquired	368		395
Goodwill and other intangible assets	22,472		5,683
Investments in subsidiaries	0		0
Due from subsidiaries and affiliates, net	0		0
Other assets	18,856		14,434
Total assets	180,254		108,967
Unpaid losses and loss expenses	70,882		45,490
Unearned premiums	18,773		10,243
Future policy benefits	5,982		5,749
Due to subsidiaries and affiliates, net	190		2,444
Repurchase agreements	1,406		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	19,416		12,916
Total liabilities	116,660		78,257
Total shareholders' equity	63,594		30,710
Total liabilities and shareholders’ equity	$ 180,254		$ 108,967
[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 September 30, 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 September 30, 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]	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 September 30, 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 Conne75

Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	$ 7,573	$ 4,709	$ 21,207	$ 13,569
Net premiums earned	7,688	4,719	21,690	13,006
Net investment income	739	549	2,121	1,662
Equity in earnings of subsidiaries	0	0	0	0
Net realized gains including OTTI	100	(397)	(510)	(360)
Losses and loss expenses	4,269	2,643	12,197	7,182
Policy benefits	155	89	427	384
Policy acquisition costs and administrative expenses	2,286	1,339	6,860	3,905
Interest (income) expense	152	68	451	207
Other (income) expense	(91)	12	(92)	(61)
Amortization of purchased intangibles	4	51	16	136
Chubb integration expenses	115	9	361	9
Income tax expense	277	132	556	395
Net income	1,360	528	2,525	2,151
Comprehensive income (loss)	1,376	(271)	4,457	768
Chubb Limited (Parent Guarantor)
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	0	0	0	0
Net premiums earned	0	0	0	0
Net investment income	1	1	3	2
Equity in earnings of subsidiaries	1,292	488	2,331	2,037
Net realized gains including OTTI	0	0	(1)	0
Losses and loss expenses	0	0	0	0
Policy benefits	0	0	0	0
Policy acquisition costs and administrative expenses	15	15	48	47
Interest (income) expense	(93)	(8)	(266)	(23)
Other (income) expense	(7)	(51)	(20)	(149)
Amortization of purchased intangibles	0	0	0	0
Chubb integration expenses	12	1	29	1
Income tax expense	6	4	17	12
Net income	1,360	528	2,525	2,151
Comprehensive income (loss)	1,376	(271)	4,457	768
Chubb INA Holdings Inc (Subsidiary Issuer)
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	0	0	0	0
Net premiums earned	0	0	0	0
Net investment income	2	1	9	2
Equity in earnings of subsidiaries	748	255	1,803	755
Net realized gains including OTTI	(2)	(4)	(3)	(6)
Losses and loss expenses	0	0	0	0
Policy benefits	0	0	0	0
Policy acquisition costs and administrative expenses	12	7	144	20
Interest (income) expense	233	68	681	206
Other (income) expense	6	(5)	26	(12)
Amortization of purchased intangibles	0	0	0	0
Chubb integration expenses	16	8	56	8
Income tax expense	(136)	(31)	(323)	(84)
Net income	617	205	1,225	613
Comprehensive income (loss)	627	(265)	2,687	(332)
Other Chubb Limited Subsidiaries
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	7,573	4,709	21,207	13,569
Net premiums earned	7,688	4,719	21,690	13,006
Net investment income	736	547	2,109	1,658
Equity in earnings of subsidiaries	0	0	0	0
Net realized gains including OTTI	102	(393)	(506)	(354)
Losses and loss expenses	4,269	2,643	12,197	7,182
Policy benefits	155	89	427	384
Policy acquisition costs and administrative expenses	2,259	1,317	6,668	3,838
Interest (income) expense	12	8	36	24
Other (income) expense	(90)	68	(98)	100
Amortization of purchased intangibles	4	51	16	136
Chubb integration expenses	87		276	0
Income tax expense	407	159	862	467
Net income	1,423	538	2,909	2,179
Comprehensive income (loss)	1,439	(262)	4,841	795
Consolidating Adjustments and Eliminations
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	0	0	0	0
Net premiums earned	0	0	0	0
Net investment income	0	0	0	0
Equity in earnings of subsidiaries	(2,040)	(743)	(4,134)	(2,792)
Net realized gains including OTTI	0	0	0	0
Losses and loss expenses	0	0	0	0
Policy benefits	0	0	0	0
Policy acquisition costs and administrative expenses	0	0	0	0
Interest (income) expense	0	0	0	0
Other (income) expense	0	0	0	0
Amortization of purchased intangibles	0	0	0	0
Chubb integration expenses	0		0	0
Income tax expense	0	0	0	0
Net income	(2,040)	(743)	(4,134)	(2,792)
Comprehensive income (loss)	$ (2,066)	$ 527	$ (7,528)	$ (463)

Information Provided In Conne76

Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016		Sep. 30, 2015		Jan. 14, 2016
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Equity Method Investment, Ownership Percentage	100.00%
Net cash flows from operating activities	$ 3,837		$ 2,699
Payments To Acquire Available For Sale Securities Debt Condensed	(23,837)		(13,060)
Purchases of fixed maturities held to maturity	(189)		(39)
Purchases of equity securities	(100)		(122)
Proceeds From Sale Of Available For Sale Securities Debt Condensed	13,863		5,233
Sales of equity securities	963		150
Maturities and redemptions of fixed maturities available for sale	6,936		5,257
Maturities and redemptions of fixed maturities held to maturity	627		552
Net change in short-term investments	11,866		421
Net derivative instruments settlements	(181)		62
Cash Acquired from Acquisition	71		620
Acquisition of subsidiaries (net of cash acquired of $71 and $620)	(14,248)		259
Payment Of Contributions To Subsidiary	0		0
Other	26		(138)
Net cash flows used for investing activities	(4,274)		(1,425)
Dividends paid on Common Shares	(851)		(644)
Common Shares repurchased	0		(758)
Proceeds from issuance of long-term debt	0		800
Proceeds from issuance of repurchase agreements	1,457		1,478
Repayment of long-term debt	0		(451)
Repayments of repurchase agreements	(1,455)		(1,477)
Proceeds from share-based compensation plans, including windfall tax benefits	117		89
Dividend to Parent Company	0		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	473		351
Policyholder contract withdrawals	(247)		(159)
Other	(4)		(6)
Net cash flows used for financing activities	(510)		(777)
Effect of foreign currency rate changes on cash and cash equivalents	42		(114)
Net increase (decrease) in cash	(905)		383
Cash – beginning of period	1,775	[1],[2]	655	[3]
Cash – end of period	870	[2],[4]	1,038	[3]
Consolidating Adjustments and Eliminations
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	(7,372)		(276)
Payments To Acquire Available For Sale Securities Debt Condensed	0		(8)
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Proceeds From Sale Of Available For Sale Securities Debt Condensed	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
Acquisition of subsidiaries (net of cash acquired of $71 and $620)	0		0
Payment Of Contributions To Subsidiary	4,680		625
Other	0		8
Net cash flows used for investing activities	4,680		625
Dividends paid on Common Shares	0		0
Common Shares repurchased			0
Proceeds from issuance of long-term debt			0
Proceeds from issuance of repurchase agreements	0		0
Repayment of long-term debt			0
Repayments of repurchase agreements	0		0
Proceeds from share-based compensation plans, including windfall tax benefits	0		0
Dividend to Parent Company	7,372		276
Capital contribution	(4,680)		(625)
Advances To From Affiliates Financing Activities	0		0
Net proceeds from (payments to) affiliated notional cash pooling program	(325)	[2]	(606)
Policyholder contract deposits	0		0
Policyholder contract withdrawals	0		0
Other	0		0
Net cash flows used for financing activities	2,367		(955)
Effect of foreign currency rate changes on cash and cash equivalents	0		0
Net increase (decrease) in cash	(325)		(606)
Cash – beginning of period	(971)	[1],[2]	(555)	[3]
Cash – end of period	(1,296)	[2],[4]	(1,161)	[3]
Chubb Limited (Parent Guarantor)
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	3,399		350
Payments To Acquire Available For Sale Securities Debt Condensed	0		0
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Proceeds From Sale Of Available For Sale Securities Debt Condensed	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
Acquisition of subsidiaries (net of cash acquired of $71 and $620)	0		0
Payment Of Contributions To Subsidiary	(2,330)		0
Other	0		0
Net cash flows used for investing activities	(2,330)		0
Dividends paid on Common Shares	(851)		(644)
Common Shares repurchased			0
Proceeds from issuance of long-term debt			0
Proceeds from issuance of repurchase agreements	0		0
Repayment of long-term debt			0
Repayments of repurchase agreements	0		0
Proceeds from share-based compensation plans, including windfall tax benefits	0		0
Dividend to Parent Company	0		0
Capital contribution	0
Advances To From Affiliates Financing Activities	(258)		(416)
Net proceeds from (payments to) affiliated notional cash pooling program	45	[2]	727	[3]
Policyholder contract deposits	0		0
Policyholder contract withdrawals	0		0
Other	0		0
Net cash flows used for financing activities	(1,064)		(333)
Effect of foreign currency rate changes on cash and cash equivalents	0		0
Net increase (decrease) in cash	5		17
Cash – beginning of period	1	[1],[2]	0	[3]
Cash – end of period	6	[2],[4]	17	[3]
Chubb INA Holdings Inc (Subsidiary Issuer)
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	3,892		(46)
Payments To Acquire Available For Sale Securities Debt Condensed	(154)
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Proceeds From Sale Of Available For Sale Securities Debt Condensed	66		0
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	59		0
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	7,627		215
Net derivative instruments settlements	(10)		(10)
Acquisition of subsidiaries (net of cash acquired of $71 and $620)	(14,282)		0
Payment Of Contributions To Subsidiary	(20)		(625)
Other	(3)		(25)
Net cash flows used for investing activities	(6,717)		(445)
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		0
Repayment of long-term debt			(450)
Repayments of repurchase agreements	0		0
Proceeds from share-based compensation plans, including windfall tax benefits	0		0
Dividend to Parent Company	0		0
Capital contribution	2,330
Advances To From Affiliates Financing Activities	219		272
Net proceeds from (payments to) affiliated notional cash pooling program	280	[2]	(121)	[3]
Policyholder contract deposits	0		0
Policyholder contract withdrawals	0		0
Other	(4)		(6)
Net cash flows used for financing activities	2,825		495
Effect of foreign currency rate changes on cash and cash equivalents	0		0
Net increase (decrease) in cash	0		4
Cash – beginning of period	2	[1],[2]	1	[3]
Cash – end of period	2	[2],[4]	5	[3]
Other Chubb Limited Subsidiaries
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	3,918		2,671
Payments To Acquire Available For Sale Securities Debt Condensed	(23,683)		(13,052)
Purchases of fixed maturities held to maturity	(189)		(39)
Purchases of equity securities	(100)		(122)
Proceeds From Sale Of Available For Sale Securities Debt Condensed	13,797		5,233
Sales of equity securities	963		150
Maturities and redemptions of fixed maturities available for sale	6,877		5,257
Maturities and redemptions of fixed maturities held to maturity	627		552
Net change in short-term investments	4,239		206
Net derivative instruments settlements	(171)		72
Acquisition of subsidiaries (net of cash acquired of $71 and $620)	34		259
Payment Of Contributions To Subsidiary	(2,330)		0
Other	29		(121)
Net cash flows used for investing activities	93		(1,605)
Dividends paid on Common Shares	0		0
Common Shares repurchased			(758)
Proceeds from issuance of long-term debt			0
Proceeds from issuance of repurchase agreements	1,457		1,478
Repayment of long-term debt			(1)
Repayments of repurchase agreements	(1,455)		(1,477)
Proceeds from share-based compensation plans, including windfall tax benefits	117		89
Dividend to Parent Company	(7,372)		(276)
Capital contribution	2,350		625
Advances To From Affiliates Financing Activities	39		144
Net proceeds from (payments to) affiliated notional cash pooling program	0	[2]	0	[3]
Policyholder contract deposits	473		351
Policyholder contract withdrawals	(247)		(159)
Other	0		0
Net cash flows used for financing activities	(4,638)		16
Effect of foreign currency rate changes on cash and cash equivalents	42		(114)
Net increase (decrease) in cash	(585)		968
Cash – beginning of period	2,743	[1],[2]	1,209	[3]
Cash – end of period	$ 2,158	[2],[4]	$ 2,177	[3]
The Chubb Corporation [Member]
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Debt Instrument, Face Amount					$ 3,300
[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 September 30, 2016 and December 31, 2015, 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 September 30, 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 September 30, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.