Chubb Limited (CB) 10-Q 4 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 21, 2017
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Trading Symbol	CB
Entity Registrant Name	Chubb Ltd
Entity Central Index Key	896,159
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Common Shares Outstanding		466,925,420

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2017		Dec. 31, 2016
Investments [Abstract]
Fixed maturities available for sale, at fair value (amortized cost - $79,957 and $79,536) (includes hybrid financial instruments of $2)		$ 80,806		$ 80,115
Fixed maturities held to maturity, at amortized cost (fair value – $10,604 and $10,670)		10,519		10,644
Equity securities, at fair value (cost – $699 and $706)		835		814
Short-term investments, at fair value and amortized cost		2,780		3,002
Other investments (cost – $4,271 and $4,270)		4,551		4,519
Total investments		99,491		99,094
Cash	[1]	1,063	[2]	985	[3]
Securities lending collateral		1,071		1,092
Accrued investment income		897		918
Insurance and reinsurance balances receivable		8,880		8,970
Reinsurance recoverable on losses and loss expenses		13,769		13,577
Reinsurance recoverable on policy benefits		187		182
Deferred policy acquisition costs		4,406		4,314
Value of business acquired		345		355
Goodwill		15,387		15,332
Other intangible assets		6,674		6,763
Prepaid reinsurance premiums		2,549		2,448
Investments in partially-owned insurance companies		666		666
Other assets		5,582		5,090
Total assets		160,967		159,786
Liabilities
Unpaid losses and loss expenses		60,579		60,540
Unearned premiums		14,857		14,779
Future policy benefits		5,086		5,036
Insurance and reinsurance balances payable		5,797		5,637
Securities lending payable		1,072		1,093
Accounts payable, accrued expenses, and other liabilities		9,073		8,617
Deferred tax liabilities		967		988
Repurchase agreements		1,404		1,403
Short-term debt		300		500
Long-term debt		12,300		12,610
Trust preferred securities		308		308
Total liabilities		111,743		111,511
Commitments and contingencies
Shareholders’ equity
Common Shares (CHF 24.15 par value; 479,783,864 shares issued; 467,223,019 and 465,968,716 shares outstanding)		11,121		11,121
Common Shares in treasury (12,560,845 and 13,815,148 shares)		(1,398)		(1,480)
Additional paid-in capital		14,795		15,335
Retained earnings		24,706		23,613
Accumulated other comprehensive income (loss) (AOCI)		0		(314)
Total shareholders’ equity		49,224		48,275
Total liabilities and shareholders’ equity		$ 160,967		$ 159,786
[1]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2017 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2017, 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, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) $ in Millions	Mar. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)shares
Statement of Financial Position [Abstract]
Available for sale, at amortized cost	$ 79,957	$ 79,536
Fixed maturities available for sale, hybrid financial instruments	2	2
Held to maturity, at Fair Value	10,604	10,670
Equity securities, at cost	699	706
Other investments, cost	$ 4,271	$ 4,270
Common Shares, shares issued | shares	479,783,864	479,783,864
Common Shares, shares outstanding | shares	467,223,019	465,968,716
Common Shares in treasury, shares | shares	12,560,845	13,815,148

Consolidated Statements Of Oper

Consolidated Statements Of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues
Net premiums written	$ 6,710	$ 5,995
Decrease in unearned premiums	62	602
Net premiums earned	6,772	6,597
Net investment income	745	674
Net Realized Gains Losses [Abstract]
Other-than-temporary impairment (OTTI) losses gross	(19)	(71)
Portion of OTTI losses recognized in other comprehensive income (OCI)	0	8
Net OTTI losses recognized in income	(19)	(63)
Net realized gains (losses) excluding OTTI losses	12	(331)
Total net realized gains (losses) (includes $(8) and $(152) reclassified from AOCI)	(7)	(394)
Total revenues	7,510	6,877
Expenses
Losses and loss expenses	3,789	3,674
Policy benefits	168	126
Policy acquisition costs	1,397	1,413
Administrative expenses	676	772
Interest expense	154	146
Other (income) expense	(70)	28
Amortization of purchased intangibles	64	7
Chubb integration expenses	111	148
Total expenses	6,289	6,314
Income before income tax	1,221	563
Income tax (benefit) expense (includes $(6) and $(1) on reclassified unrealized losses)	128	124
Net income	1,093	439
Other comprehensive income
Unrealized appreciation	307	905
Reclassification adjustment for net realized losses included in net income	8	152
Unrealized appreciation (Depreciation) after reclassification adjustment	315	1,057
Change in:
Cumulative foreign currency translation adjustment	134	312
Postretirement benefit liability adjustment	(20)	2
Other comprehensive income, before income tax	429	1,371
Income tax expense related to OCI items	(115)	(269)
Other comprehensive income	314	1,102
Comprehensive income	$ 1,407	$ 1,541
Earnings per share
Basic earnings per share	$ 2.33	$ 0.98
Diluted earnings per share	$ 2.31	$ 0.97

Consolidated Statements Of Ope5

Consolidated Statements Of Operations and Comprehensive Income Consolidated Statements of Operations and Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Total net realized gains (losses) reclassified from AOCI	$ (8)	$ (152)
Income tax expense on reclassified unrealized gains and loses	$ (6)	$ (1)

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 Foreign Currency Translation Adjustment [Member]	Postretirement Benefit Liability Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance - beginning of period at Dec. 31, 2015		$ 7,833		$ (1,922)	$ 4,481		$ 19,478	$ 874	$ (1,539)	$ (70)
Shares Issued for Chubb Corp Acquisition			$ 3,288			$ 11,916
Common Shares repurchased				0
Net shares redeemed under employee share-based compensation plans				274	(310)	323
Exercise of stock options					(21)
Share-based compensation expense and other					65
Funding of dividends declared to Retained earnings					(314)
Net income	$ 439						439
Funding of dividends declared from Additional paid-in capital							314
Dividends declared on Common Shares							(314)
Change in period, before reclassification from AOCI, net of income tax expense of $(102) and $(232)								673
Amounts reclassified from AOCI, net of income tax expense of $(6) and $(1)								151
Change in period, net of income tax expense of $(108) and $(233)								824
Change in period, net of income tax expense of $(3) and $(35)									277
Change in period, net of income tax expense of $(4) and $(1)										1
Balance - end of period at Mar. 31, 2016	45,897	11,121		(1,648)	16,140		19,917	1,698	(1,262)	(69)	$ 367
Balance - beginning of period at Dec. 31, 2016	48,275	11,121		(1,480)	15,335		23,613	1,058	(1,663)	291
Shares Issued for Chubb Corp Acquisition			$ 0			0
Common Shares repurchased				(140)
Net shares redeemed under employee share-based compensation plans				222	(260)	$ 0
Exercise of stock options					(21)
Share-based compensation expense and other					65
Funding of dividends declared to Retained earnings					(324)
Net income	1,093						1,093
Funding of dividends declared from Additional paid-in capital							324
Dividends declared on Common Shares							(324)
Change in period, before reclassification from AOCI, net of income tax expense of $(102) and $(232)								205
Amounts reclassified from AOCI, net of income tax expense of $(6) and $(1)								2
Change in period, net of income tax expense of $(108) and $(233)								207
Change in period, net of income tax expense of $(3) and $(35)									131
Change in period, net of income tax expense of $(4) and $(1)										(24)
Balance - end of period at Mar. 31, 2017	$ 49,224	$ 11,121		$ (1,398)	$ 14,795		$ 24,706	$ 1,265	$ (1,532)	$ 267	$ 0

Consolidated Statements Of Sha7

Consolidated Statements Of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement Consolidated Statements Of Shareholders Equity [Abstract]
Change in year, before reclassification from AOCI, net of income tax benefit(expense)	$ (102)	$ (232)
Income tax benefit (expense) from reclassification of unrealized gains	(6)	(1)
Net unrealized appreciation on investments, Change in period, income tax (expense) benefit	(108)	(233)
Cumulative translation adjustment, Change in period, income tax(expense) benefit	(3)	(35)
Net income	1,093	439
Pension liability adjustment, Change in period, income tax (expense) benefit	$ (4)	$ (1)

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Cash flows from operating activities
Net income	$ 1,093		$ 439
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	7		394
Amortization of premiums/discounts on fixed maturities	184		174
Amortization of UPR related to the Chubb Corp acquisition	0		570
Deferred income taxes	(127)		(42)
Unpaid losses and loss expenses	(154)		(72)
Unearned premiums	17		(616)
Future policy benefits	40		28
Insurance and reinsurance balances payable	252		(15)
Accounts payable, accrued expenses, and other liabilities	(491)		(34)
Income taxes payable	191		143
Insurance and reinsurance balances receivable	30		601
Reinsurance recoverable on losses and loss expenses	(122)		194
Reinsurance recoverable on policy benefits	(5)		3
Deferred policy acquisition costs	(59)		(480)
Prepaid reinsurance premiums	(81)		14
Other	238		(281)
Net cash flows from operating activities	1,013		1,020
Cash flows from investing activities
Purchases of fixed maturities available for sale	(6,250)		(8,104)
Purchases of fixed maturities held to maturity	(157)		(77)
Purchases of equity securities	(37)		(33)
Sales of fixed maturities available for sale	3,395		6,329
Sales of equity securities	46		761
Maturities and redemptions of fixed maturities available for sale	2,543		1,553
Maturities and redemptions of fixed maturities held to maturity	240		249
Net change in short-term investments	232		11,932
Net derivative instruments settlements	(89)		(22)
Acquisition of subsidiaries (net of cash acquired of nil and $57)	0		(14,262)
Other	17		59
Net cash flows used for investing activities	(60)		(1,615)
Cash flows from financing activities
Dividends paid on Common Shares	(324)		(218)
Common Shares repurchased	(128)		0
Repayment of long-term debt	(500)		0
Proceeds from issuance of repurchase agreements	753		853
Repayment of repurchase agreements	(752)		(853)
Proceeds from share-based compensation plans	42		51
Policyholder contract deposits	109		118
Policyholder contract withdrawals	(58)		(49)
Other	0		(4)
Net cash flows used for financing activities	(858)		(102)
Effect of foreign currency rate changes on cash and cash equivalents	(17)		13
Net (decrease) increase in cash	78		(684)
Cash – beginning of period	985	[1],[2]	1,775	[3]
Cash – end of period	1,063	[2],[4]	1,091	[3]
Supplemental cash flow information
Taxes paid	54		106
Interest paid	$ 75		$ 71
[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, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2017 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 and 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 March 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Consolidated Statements of Cas9

Consolidated Statements of Cash Flows (Parentheticals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Cash Flows [Abstract]
Cash Acquired from Acquisition	$ 0	$ 57

General

General	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General a) Basis of presentation 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. Chubb operates 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. Refer to Note 10 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 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 2016 Form 10-K. b) Goodwill During the three months ended March 31, 2017, Goodwill increased $ 55 million , reflecting the impact of foreign exchange. c) Debt In February 2017, Chubb INA Holdings Inc.’s $ 500 million of 5.7 percent senior notes matured and were fully paid. In March 2017, we reclassified $300 million of 5.8 percent senior notes, due to mature in March 2018, from Long-term debt to Short-term debt in the Consolidated balance sheets. Effective April 15, 2017, the interest rate on our $ 1.0 billion of unsecured junior subordinated capital securities converted to a floating rate, equal to the three-month LIBOR plus 2.25 percentage points, or approximately 3.41 percent on the conversion date. Previously, these capital securities carried interest at a rate of 6.375 percent. The scheduled maturity date for these securities is April 15, 2037. d) Accounting guidance adopted in 2017 Stock Compensation Effective January 2017, we prospectively adopted new guidance on stock compensation which requires recognition of the excess tax benefits or deficiencies of share-based compensation awards to employees through net income rather than through additional paid in capital. The calculation of the excess tax benefits or deficiencies is based on the difference between the market value of a stock award at the date of vesting, or at the time of exercise for a stock option, compared to the grant date fair value recognized as compensation expense in the Consolidated statements of operations. For the three months ended March 31, 2017, the excess tax benefit recorded to Income tax expense on the Consolidated statement of operations was $ 25 million . Additionally, the guidance allows for an election to account for forfeitures related to share-based payments either as they occur or through an estimation method. We elected to retain our current accounting for compensation expense using a forfeiture estimation process. e) Accounting guidance not yet adopted Revenue from Contracts with Customers In May 2014, the Financial Accounting Standards Board (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 given that the majority of our business is outside the scope of this guidance. 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 (AFS) debt securities in combination with other deferred tax assets. The standard will be 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 debt 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 potential credit loss exists. The AFS debt security model will also require the use of a valuation allowance as compared to the current practice of writing down the asset. The standard will be 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. 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 will be 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. Goodwill Impairment In January 2017, the FASB issued updated guidance on goodwill impairment testing that eliminates Step 2 of the goodwill impairment test requiring entities to calculate the implied fair value of goodwill through a hypothetical purchase price allocation. Under the updated guidance, impairment will now be recognized as the amount by which a reporting unit’s carrying value exceeds its fair value. The standard will be effective for us in the first quarter of 2020 on a prospective basis with early adoption permitted. We do not expect the adoption of this guidance to have a material effect on our financial condition and results of operations.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2017
Business Combinations [Abstract]
Acquisitions	Acquisition The Chubb Corporation (Chubb Corp) 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. In addition, we assumed outstanding equity awards to employees and directors with an attributed value of $323 million . The total consideration, including the assumption of equity awards, was $29.8 billion . 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. Refer to the 2016 Form 10-K for additional information on this acquisition. The consolidated financial statements include the results of Chubb Corp from the acquisition date. The following table summarizes the results of the acquired Chubb Corp operations from January 14, 2016 to March 31, 2016 included within our 2016 Consolidated statement of operations: (in millions of U.S. dollars) January 14, 2016 to March 31, 2016 Total revenues $ 2,487 Net income $ 255 The following table provides supplemental unaudited pro forma consolidated information for the three months ended March 31, 2016 , 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 (in millions of U.S. dollars, except per share data) March 31, 2016 Total revenues $ 7,322 Net income $ 534 Earnings per share Basic earnings per share $ 1.14 Diluted earnings per share $ 1.14

Investments

Investments	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	Investments a) Fixed maturities March 31, 2017 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 $ 2,900 $ 34 $ (35 ) $ 2,899 $ — Foreign 20,795 651 (79 ) 21,367 (3 ) Corporate securities 24,372 603 (133 ) 24,842 (8 ) Mortgage-backed securities 14,217 127 (198 ) 14,146 (1 ) States, municipalities, and political subdivisions 17,673 81 (202 ) 17,552 — $ 79,957 $ 1,496 $ (647 ) $ 80,806 $ (12 ) Held to maturity U.S. Treasury and agency $ 601 $ 10 $ (3 ) $ 608 $ — Foreign 625 27 (1 ) 651 — Corporate securities 2,710 50 (20 ) 2,740 — Mortgage-backed securities 1,319 35 — 1,354 — States, municipalities, and political subdivisions 5,264 37 (50 ) 5,251 — $ 10,519 $ 159 $ (74 ) $ 10,604 $ — December 31, 2016 Amortized Cost Gross Unrealized Appreciation Gross Unrealized Depreciation Fair Value OTTI Recognized in AOCI (in millions of U.S. dollars) Available for sale U.S. Treasury and agency $ 2,883 $ 32 $ (45 ) $ 2,870 $ — Foreign 20,929 636 (125 ) 21,440 (5 ) Corporate securities 23,736 580 (167 ) 24,149 (8 ) Mortgage-backed securities 14,066 135 (194 ) 14,007 (1 ) States, municipalities, and political subdivisions 17,922 72 (345 ) 17,649 — $ 79,536 $ 1,455 $ (876 ) $ 80,115 $ (14 ) Held to maturity U.S. Treasury and agency $ 655 $ 9 $ (3 ) $ 661 $ — Foreign 640 28 (1 ) 667 — Corporate securities 2,771 50 (26 ) 2,795 — Mortgage-backed securities 1,393 35 — 1,428 — States, municipalities, and political subdivisions 5,185 26 (92 ) 5,119 — $ 10,644 $ 148 $ (122 ) $ 10,670 $ — 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 Net unrealized appreciation on investments in the Consolidated statement of shareholders’ equity. For the three months ended March 31, 2017 and 2016, nil and $ 23 million , respectively, of net unrealized appreciation related to such securities is included in OCI. At both March 31, 2017 and December 31, 2016 , AOCI included cumulative net unrealized appreciation of $10 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-backed securities (TBAs) held (refer to Note 6 c) (iv)) and are included in the category, “Mortgage-backed securities”. Approximately 82 percent and 81 percent of the total mortgage-backed securities at March 31, 2017 and December 31, 2016 , respectively, are represented by investments in U.S. government agency bonds. The remainder of the mortgage exposure consists of collateralized mortgage obligations and non-government mortgage-backed securities, the majority of which provide a planned structure for principal and interest payments and carry a rating of AAA by the major credit rating agencies. The following table presents fixed maturities by contractual maturity: March 31 December 31 2017 2016 (in millions of U.S. dollars) Amortized Cost Fair Value Amortized Cost Fair Value Available for sale Due in 1 year or less $ 3,828 $ 3,851 $ 3,892 $ 3,913 Due after 1 year through 5 years 23,950 24,413 24,027 24,429 Due after 5 years through 10 years 27,693 27,955 27,262 27,379 Due after 10 years 10,269 10,441 10,289 10,387 65,740 66,660 65,470 66,108 Mortgage-backed securities 14,217 14,146 14,066 14,007 $ 79,957 $ 80,806 $ 79,536 $ 80,115 Held to maturity Due in 1 year or less $ 481 $ 486 $ 430 $ 435 Due after 1 year through 5 years 2,648 2,695 2,646 2,691 Due after 5 years through 10 years 2,973 2,980 2,969 2,944 Due after 10 years 3,098 3,089 3,206 3,172 9,200 9,250 9,251 9,242 Mortgage-backed securities 1,319 1,354 1,393 1,428 $ 10,519 $ 10,604 $ 10,644 $ 10,670 Expected maturities could differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties. b) Equity securities March 31 December 31 (in millions of U.S. dollars) 2017 2016 Cost $ 699 $ 706 Gross unrealized appreciation 144 129 Gross unrealized depreciation (8 ) (21 ) Fair value $ 835 $ 814 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, we 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 sheets, we employ analysis similar to fixed maturities, when applicable. Evaluation of potential credit losses related to fixed maturities 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. Corporate securities Projected cash flows for corporate securities (principally senior unsecured bonds) are driven primarily by assumptions regarding probability of default and also the timing and amount of recoveries associated with defaults. Chubb developed projected cash flows for corporate securities using market observable data, issuer-specific information, and credit ratings. We use historical default data by Moody’s Investors Service (Moody’s) rating category to calculate a 1-in-100 year probability of default, which results in a default assumption in excess of the historical mean default rate. Consistent with management's approach, Chubb assumed a 32 percent recovery rate (the par value of a defaulted security that will be recovered) across all rating categories rather than using Moody's historical mean recovery rate of 42 percent. We believe that use of a default assumption in excess of the historical mean is conservative in light of current market conditions. For the three months ended March 31, 2017 and 2016 , credit losses recognized in Net income for corporate securities were $1 million and $ 17 million , respectively. Mortgage-backed securities For mortgage-backed securities, credit impairment is assessed using a cash flow model that estimates the cash flows on the underlying mortgages, using the security-specific collateral and transaction structure. The model estimates cash flows from the underlying mortgage loans and distributes those cash flows to various tranches of securities, considering the transaction structure and any subordination and credit enhancements that exist in that structure. The cash flow model incorporates actual cash flows on the mortgage-backed securities through the current period and then projects the remaining cash flows using a number of assumptions, including default rates, prepayment rates, and loss severity rates (the par value of a defaulted security that will not be recovered) on foreclosed properties. For both the three months ended March 31, 2017 and 2016, there were no credit losses recognized in Net income for mortgage-backed securities. The following table presents the Net realized gains (losses) and the losses included in Net realized gains (losses) and OCI as a result of conditions which caused us to conclude the decline in fair value of certain investments was “other-than-temporary”: Three Months Ended March 31 (in millions of U.S. dollars) 2017 2016 Fixed maturities: OTTI on fixed maturities, gross $ (6 ) $ (67 ) OTTI on fixed maturities recognized in OCI (pre-tax) — 8 OTTI on fixed maturities, net (6 ) (59 ) Gross realized gains excluding OTTI 34 65 Gross realized losses excluding OTTI (40 ) (196 ) Total fixed maturities (12 ) (190 ) Equity securities: OTTI on equity securities (5 ) (1 ) Gross realized gains excluding OTTI 9 40 Gross realized losses excluding OTTI — (1 ) Total equity securities 4 38 OTTI on other investments (8 ) (3 ) Foreign exchange gains (losses) (19 ) 39 Investment and embedded derivative instruments 6 (39 ) Fair value adjustments on insurance derivative 93 (228 ) S&P put options and futures (74 ) (15 ) Other derivative instruments 2 (2 ) Other 1 6 Net realized gains (losses) $ (7 ) $ (394 ) The following table presents a roll-forward of pre-tax credit losses related to fixed maturities for which a portion of OTTI was recognized in OCI: Three Months Ended March 31 (in millions of U.S. dollars) 2017 2016 Balance of credit losses related to securities still held – beginning of period $ 35 $ 53 Additions where no OTTI was previously recorded — 11 Additions where an OTTI was previously recorded 1 6 Reductions for securities sold during the period (4 ) (13 ) Balance of credit losses related to securities still held – end of period $ 32 $ 57 d) Gross unrealized loss At March 31, 2017 , there were 9,408 fixed maturities out of a total of 31,098 fixed maturities in an unrealized loss position. The largest single unrealized loss in the fixed maturities was $6 million . There were 70 equity securities out of a total of 325 equity securities in an unrealized loss position. The largest single unrealized loss in the equity securities was $1 million . Fixed maturities in an unrealized loss position at March 31, 2017 , comprised both investment grade and below investment grade securities for which fair value declined primarily due to widening credit spreads since the date of purchase. The following tables present, for all securities in an unrealized loss position (including securities on loan), the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position: 0 – 12 Months Over 12 Months Total March 31, 2017 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 $ 2,011 $ (38 ) $ — $ — $ 2,011 $ (38 ) Foreign 4,428 (59 ) 684 (21 ) 5,112 (80 ) Corporate securities 6,139 (121 ) 491 (32 ) 6,630 (153 ) Mortgage-backed securities 8,735 (195 ) 131 (3 ) 8,866 (198 ) States, municipalities, and political subdivisions 16,731 (248 ) 123 (4 ) 16,854 (252 ) Total fixed maturities 38,044 (661 ) 1,429 (60 ) 39,473 (721 ) Equity securities 150 (8 ) — — 150 (8 ) Other investments 84 (9 ) — — 84 (9 ) Total $ 38,278 $ (678 ) $ 1,429 $ (60 ) $ 39,707 $ (738 ) 0 – 12 Months Over 12 Months Total December 31, 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 $ 2,216 $ (48 ) $ — $ — $ 2,216 $ (48 ) Foreign 5,918 (99 ) 386 (27 ) 6,304 (126 ) Corporate securities 7,021 (149 ) 641 (44 ) 7,662 (193 ) Mortgage-backed securities 8,638 (189 ) 234 (5 ) 8,872 (194 ) States, municipalities, and political subdivisions 19,448 (435 ) 49 (2 ) 19,497 (437 ) Total fixed maturities 43,241 (920 ) 1,310 (78 ) 44,551 (998 ) Equity securities 199 (21 ) — — 199 (21 ) Other investments 201 (18 ) — — 201 (18 ) Total $ 43,641 $ (959 ) $ 1,310 $ (78 ) $ 44,951 $ (1,037 ) e) Restricted assets Chubb is required to maintain assets on deposit with various regulatory authorities to support its insurance and reinsurance operations. These requirements are generally promulgated in the statutory regulations of the individual jurisdictions. The assets on deposit are available to settle insurance and reinsurance liabilities. Chubb is also required to restrict assets pledged under repurchase agreements, which represent Chubb's agreement to sell securities and repurchase them at a future date for a predetermined price. We also use trust funds in certain large reinsurance transactions where the trust funds are set up for the benefit of the ceding companies and generally take the place of letter of credit (LOC) requirements. We also have investments in segregated portfolios primarily to provide collateral or guarantees for LOC and derivative transactions. Included in restricted assets at March 31, 2017 and December 31, 2016 are investments, primarily fixed maturities, totaling $20.6 billion and $20.1 billion, respectively, and cash of $97 million and $103 million, respectively. The following table presents the components of restricted assets: March 31 December 31 (in millions of U.S. dollars) 2017 2016 Trust funds $ 14,359 $ 13,880 Deposits with U.S. regulatory authorities 2,356 2,203 Deposits with non-U.S. regulatory authorities 2,192 2,191 Assets pledged under repurchase agreements 1,453 1,461 Other pledged assets 366 435 $ 20,726 $ 20,170

Fair value measurements

Fair value measurements	3 Months Ended
	Mar. 31, 2017
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 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. 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. The GMIB annuitization rate is the percentage of policies for which the policyholder will elect to annuitize using the guaranteed benefit provided under the GMIB. All else equal, as GMIB annuitization rates increase, ultimate claim payments will increase, subject to treaty claim limits. The effect of changes in key market factors on assumed lapse and annuitization rates reflect emerging trends using data available from cedants. For treaties with limited experience, rates are established in line with data received from other ceding companies adjusted, as appropriate, with industry estimates. The model and related assumptions are regularly re-evaluated by management and enhanced, as appropriate, based upon additional experience obtained related to policyholder behavior and availability of updated information such as market conditions, market participant assumptions, and demographics of in-force annuities. Because of the significant use of unobservable inputs including policyholder behavior, GLB reinsurance is classified within Level 3. For the three months ended March 31, 2017 and 2016, 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 2016 Form 10-K. Financial instruments measured at fair value on a recurring basis, by valuation hierarchy March 31, 2017 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available for sale U.S. Treasury and agency $ 2,222 $ 677 $ — $ 2,899 Foreign — 21,287 80 21,367 Corporate securities — 24,105 737 24,842 Mortgage-backed securities — 14,101 45 14,146 States, municipalities, and political subdivisions — 17,552 — 17,552 2,222 77,722 862 80,806 Equity securities 794 — 41 835 Short-term investments 1,548 1,211 21 2,780 Other investments (1) 425 280 232 937 Securities lending collateral — 1,071 — 1,071 Investment derivative instruments 15 — — 15 Other derivative instruments 8 — — 8 Separate account assets 1,970 97 — 2,067 Total assets measured at fair value (1) $ 6,982 $ 80,381 $ 1,156 $ 88,519 Liabilities: Investment derivative instruments $ 30 $ — $ — $ 30 Other derivative instruments — — 11 11 GLB (2) — — 466 466 Total liabilities measured at fair value $ 30 $ — $ 477 $ 507 (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $ 3,594 million and other investments of $ 20 million at March 31, 2017 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. December 31, 2016 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available for sale U.S. Treasury and agency $ 2,175 $ 695 $ — $ 2,870 Foreign — 21,366 74 21,440 Corporate securities — 23,468 681 24,149 Mortgage-backed securities — 13,962 45 14,007 States, municipalities, and political subdivisions — 17,649 — 17,649 2,175 77,140 800 80,115 Equity securities 773 — 41 814 Short-term investments 1,757 1,220 25 3,002 Other investments (1) 384 259 225 868 Securities lending collateral — 1,092 — 1,092 Investment derivative instruments 31 — — 31 Other derivative instruments 3 — — 3 Separate account assets 1,784 95 — 1,879 Total assets measured at fair value (1) $ 6,907 $ 79,806 $ 1,091 $ 87,804 Liabilities: Investment derivative instruments $ 54 $ — $ — $ 54 Other derivative instruments — — 13 13 GLB (2) — — 559 559 Total liabilities measured at fair value $ 54 $ — $ 572 $ 626 (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $3,626 million and other investments of $25 million at December 31, 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. There were no transfers of financial instruments between Level 1 and Level 2 for both the three months ended March 31, 2017 and 2016. Fair value of alternative investments Alternative investments include investment funds, limited partnerships, and partially-owned investment companies measured at fair value using NAV as a practical expedient. The following table presents, by investment category, the expected liquidation period, fair value, and maximum future funding commitments of alternative investments: March 31 December 31 Expected Liquidation Period of Underlying Assets 2017 2016 (in millions of U.S. dollars) Fair Value Maximum Future Funding Commitments Fair Value Maximum Future Funding Commitments Financial 5 to 9 Years $ 548 $ 398 $ 548 $ 428 Real Assets 3 to 7 Years 612 186 536 230 Distressed 5 to 9 Years 350 179 485 179 Private Credit 3 to 7 Years 244 248 236 259 Traditional 3 to 9 Years 1,563 870 1,550 930 Vintage 1 to 2 Years 18 14 21 14 Investment funds Not Applicable 259 — 251 — $ 3,594 $ 1,895 $ 3,627 $ 2,040 Included in all categories in the above table, except for Investment funds, are investments for which Chubb will never have the contractual option to redeem but receives distributions based on the liquidation of the underlying assets. Further, for all categories except for Investment funds, Chubb does not have the ability to sell or transfer the investments without the consent from the general partner of individual funds. Investment Category: Consists of investments in private equity funds: Financial targeting financial services companies such as financial institutions and insurance services worldwide Real Assets targeting investments related to hard physical assets such as real estate, infrastructure and natural resources Distressed targeting distressed corporate debt/credit and equity opportunities in the U.S. Private Credit targeting privately originated corporate debt investments including senior secured loans and subordinated bonds Traditional employing traditional private equity investment strategies such as buyout and growth equity globally Vintage made before 2002 and where the funds’ commitment periods had already expired Investment funds Chubb’s investment funds employ various investment strategies such as long/short equity and arbitrage/distressed. Included in this category are investments for which Chubb has the option to redeem at agreed upon value as described in each investment fund’s subscription agreement. Depending on the terms of the various subscription agreements, investment fund investments may be redeemed monthly, quarterly, semi-annually, or annually. If Chubb wishes to redeem an investment fund investment, it must first determine if the investment fund is still in a lock-up period (a time when Chubb cannot redeem its investment so that the investment fund manager has time to build the portfolio). If the investment fund is no longer in its lock-up period, Chubb must then notify the investment fund manager of its intention to redeem by the notification date prescribed by the subscription agreement. Subsequent to notification, the investment fund can redeem Chubb’s investment within several months of the notification. Notice periods for redemption of the investment funds range between 5 and 120 days. Chubb can redeem its investment funds without consent from the investment fund managers. Level 3 financial instruments The fair values of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) consist of various inputs and assumptions that management makes when determining fair value. Management analyzes changes in fair value measurements classified within Level 3 by comparing pricing and returns of our investments to benchmarks, including month-over-month movements, investment credit spreads, interest rate movements, and credit quality of securities. The following table presents the significant unobservable inputs used in the Level 3 liability valuations. Excluded from the table below are inputs used to determine the fair value of Level 3 assets which are based on single broker quotes and contain no quantitative unobservable inputs developed by management. (in millions of U.S. dollars, except for percentages) Fair Value Valuation Technique Significant Unobservable Inputs Ranges March 31, 2017 December 31, 2016 GLB (1) $ 466 $ 559 Actuarial model Lapse rate 3% – 34% Annuitization rate 0% – 78% (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) March 31, 2017 Foreign Corporate securities MBS (in millions of U.S. dollars) Balance – beginning of period $ 74 $ 681 $ 45 $ 41 $ 25 $ 225 $ 13 $ 559 Transfers into Level 3 — 29 — — — — — — Transfers out of Level 3 — (54 ) — — — — — — Change in Net Unrealized Gains (Losses) included in OCI (1 ) (8 ) — — — 4 — — Net Realized Gains/Losses (1 ) (1 ) — — — — (2 ) (93 ) Purchases 14 156 1 — 7 8 — — Sales (3 ) (27 ) (1 ) — — — — — Settlements (3 ) (39 ) — — (11 ) (4 ) — — Balance – end of period $ 80 $ 737 $ 45 $ 41 $ 21 $ 233 $ 11 $ 466 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ — $ — $ — $ — $ — $ (2 ) $ (93 ) (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 $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 million, respectively. Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity Other Other derivative instruments GLB (1) March 31, 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 6 16 — — — — — Transfers out of Level 3 (2 ) — — — — — — Change in Net Unrealized Gains (Losses) included in OCI 6 2 — — — — — Net Realized Gains/Losses (5 ) (6 ) — — — 2 230 Purchases (2) 5 93 — 13 6 2 — Sales (1 ) (14 ) (5 ) — — — — Settlements (4 ) (4 ) — — (7 ) — — Balance – end of period $ 62 $ 261 $ 48 $ 29 $ 211 $ 10 $ 839 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (4 ) $ (7 ) $ — $ — $ — $ 2 $ 230 (1) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $1.1 billion at March 31, 2016 , and $888 million at December 31, 2015, which includes a fair value derivative adjustment of $839 million and $609 million, respectively. (2) Includes acquired invested assets as a result of the Chubb Corp acquisition. b) Financial instruments disclosed, but not measured, at fair value Chubb uses various financial instruments in the normal course of its business. Our insurance contracts are excluded from fair value of financial instruments accounting guidance, and therefore, are not included in the amounts discussed below. The carrying values of cash, other assets, other liabilities, and other financial instruments not included below approximated their fair values. Investments in partially-owned insurance companies Fair values for investments in partially-owned insurance companies are based on Chubb’s share of the net assets based on the financial statements provided by those companies and are excluded from the valuation hierarchy tables below. Short- and long-term debt, repurchase agreements, and trust preferred securities Where practical, fair values for short-term debt, long-term debt, repurchase agreements, and trust preferred securities are estimated using discounted cash flow calculations based principally on observable inputs including incremental borrowing rates, which reflect Chubb’s credit rating, for similar types of borrowings with maturities consistent with those remaining for the debt being valued. The following tables present fair value, by valuation hierarchy, and carrying value of the financial instruments not measured at fair value: March 31, 2017 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 $ 518 $ 90 $ — $ 608 $ 601 Foreign — 651 — 651 625 Corporate securities — 2,728 12 2,740 2,710 Mortgage-backed securities — 1,354 — 1,354 1,319 States, municipalities, and political subdivisions — 5,251 — 5,251 5,264 Total assets $ 518 $ 10,074 $ 12 $ 10,604 $ 10,519 Liabilities: Repurchase agreements $ — $ 1,404 $ — $ 1,404 $ 1,404 Short-term debt — 312 — 312 300 Long-term debt — 12,757 — 12,757 12,300 Trust preferred securities — 458 — 458 308 Total liabilities $ — $ 14,931 $ — $ 14,931 $ 14,312 December 31, 2016 Fair Value Carrying Value (in millions of U.S. dollars) Level 1 Level 2 Level 3 Total Assets: Fixed maturities held to maturity U.S. Treasury and agency $ 555 $ 106 $ — $ 661 $ 655 Foreign — 667 — 667 640 Corporate securities — 2,782 13 2,795 2,771 Mortgage-backed securities — 1,428 — 1,428 1,393 States, municipalities, and political subdivisions — 5,119 — 5,119 5,185 Total assets $ 555 $ 10,102 $ 13 $ 10,670 $ 10,644 Liabilities: Repurchase agreements $ — $ 1,403 $ — $ 1,403 $ 1,403 Short-term debt — 503 — 503 500 Long-term debt — 12,998 — 12,998 12,610 Trust preferred securities — 456 — 456 308 Total liabilities $ — $ 15,360 $ — $ 15,360 $ 14,821

Unpaid losses and loss expenses

Unpaid losses and loss expenses Unpaid losses and loss expenses	3 Months Ended
	Mar. 31, 2017
Liability for Claims and Claims Adjustment Expense [Abstract]
Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block]	5. Unpaid losses and loss expenses The following table presents a reconciliation of beginning and ending Unpaid losses and loss expenses: Three Months Ended March 31 (in millions of U.S. dollars) 2017 2016 Gross unpaid losses and loss expenses – beginning of period $ 60,540 $ 37,303 Reinsurance recoverable on unpaid losses (1) (12,708 ) (10,741 ) Net unpaid losses and loss expenses – beginning of period 47,832 26,562 Acquisition of subsidiaries — 21,363 Total 47,832 47,925 Net losses and loss expenses incurred in respect of losses occurring in: Current year 4,078 3,965 Prior years (2) (289 ) (291 ) Total 3,789 3,674 Net losses and loss expenses paid in respect of losses occurring in: Current year 798 586 Prior years 3,109 2,963 Total 3,907 3,549 Foreign currency revaluation and other 54 29 Net unpaid losses and loss expenses – end of period 47,768 48,079 Reinsurance recoverable on unpaid losses (1) 12,811 12,127 Gross unpaid losses and loss expenses – end of period $ 60,579 $ 60,206 (1) Net of provision for uncollectible reinsurance. (2) Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, and earned premiums.

Commitments, contingencies, and

Commitments, contingencies, and guarantees	3 Months Ended
	Mar. 31, 2017
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 on equity market indices to limit equity exposure in the GMDB and GLB blocks of business. All derivative instruments are carried at fair value with changes in fair value recorded in Net realized gains (losses) in the Consolidated statements of operations. None of the derivative instruments are designated as hedges for accounting purposes. The following table presents the balance sheet locations, fair values of derivative instruments in an asset or (liability) position, and notional values/payment provisions of our derivative instruments: March 31, 2017 December 31, 2016 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) $ 12 $ (26 ) $ 2,303 $ 25 $ (50 ) $ 2,220 Cross-currency swaps OA / (AP) — — 95 — — 95 Options/Futures contracts on notes and bonds OA / (AP) 3 (4 ) 834 6 (4 ) 2,344 Convertible securities (1) FM AFS / ES 2 — 7 2 — 7 $ 17 $ (30 ) $ 3,239 $ 33 $ (54 ) $ 4,666 Other derivative instruments Futures contracts on equities (2) OA / (AP) $ 4 $ — $ 1,391 $ 1 $ — $ 1,316 Other OA / (AP) 4 (11 ) 254 2 (13 ) 214 $ 8 $ (11 ) $ 1,645 $ 3 $ (13 ) $ 1,530 GLB (3) (AP) / (FPB) $ — $ (774 ) $ 1,186 $ — $ (853 ) $ 1,264 (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. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts. At March 31, 2017 and December 31, 2016, derivative liabilities of $1 million and $10 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. 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. 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 the carrying value of collateral held under securities lending agreements by investment category and remaining contractual maturity of the underlying agreements: Remaining contractual maturity March 31 December 31 2017 2016 (in millions of U.S. dollars) Overnight and Continuous Collateral held under securities lending agreements: Cash $ 570 $ 423 U.S. Treasury and agency 22 54 Foreign 233 578 Corporate securities — 37 Mortgage-backed securities 33 — Equity securities 213 — $ 1,071 $ 1,092 Gross amount of recognized liability for securities lending payable $ 1,072 $ 1,093 Difference (1) $ (1 ) $ (1 ) (1) The carrying value of the securities lending collateral held is $ 1 million lower than the securities lending payable at both March 31, 2017 and December 31, 2016, due to accrued interest recorded in the securities lending payable. At March 31, 2017 and December 31, 2016, our repurchase agreement obligations of $1,404 million and $1,403 million , respectively, were fully collateralized. In contrast to securities lending programs, the use of cash received is not restricted for the repurchase obligations. The fair value of the underlying securities sold remains in Fixed maturities available for sale and Equity securities and the repurchase agreement obligation is recorded in Repurchase agreements in the Consolidated balance sheets. The following table presents the carrying value of collateral pledged under repurchase agreements by investment category and remaining contractual maturity of the underlying agreements: Remaining contractual maturity March 31, 2017 December 31, 2016 Up to 30 Days Greater than 90 Days Total Up to 30 Days Greater than 90 Days Total (in millions of U.S. dollars) Collateral pledged under repurchase agreements: Cash $ — $ — $ — $ — $ 1 $ 1 U.S. Treasury and agency 9 236 245 230 10 240 Mortgage-backed securities 360 848 1,208 339 881 1,220 $ 369 $ 1,084 $ 1,453 $ 569 $ 892 $ 1,461 Gross amount of recognized liabilities for repurchase agreements $ 1,404 $ 1,403 Difference (1) $ 49 $ 58 (1) Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability. The following table presents net realized gains (losses) related to derivative instrument activity in the Consolidated statements of operations: Three Months Ended March 31 (in millions of U.S. dollars) 2017 2016 Investment and embedded derivative instruments Foreign currency forward contracts $ 14 $ (10 ) All other futures contracts and options (8 ) (34 ) Convertible securities (1) — 5 Total investment and embedded derivative instruments $ 6 $ (39 ) GLB and other derivative instruments GLB (2) $ 93 $ (228 ) Futures contracts on equities (3) (74 ) (15 ) Other 2 (2 ) Total GLB and other derivative instruments $ 21 $ (245 ) $ 27 $ (284 ) (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. The price of an option is influenced by the underlying security, expected volatility, time to expiration, and supply and demand. The credit risk associated with the above derivative financial instruments relates to the potential for non-performance by counterparties. Although non-performance is not anticipated, in order to minimize the risk of loss, management monitors the creditworthiness of its counterparties and obtains collateral. The performance of exchange-traded instruments is guaranteed by the exchange on which they trade. For non-exchange-traded instruments, the counterparties are principally banks which must meet certain criteria according to our investment guidelines. Cross-currency swaps Cross-currency swaps are agreements under which two counterparties exchange interest payments and principal denominated in different currencies at a future date. We use cross-currency swaps to reduce the foreign currency and interest rate risk by converting cash flows back into local currency. We invest in foreign currency denominated investments to improve credit diversification and also to obtain better duration matching to our liabilities that is limited in the local currency market. Other Included within Other are derivatives intended to reduce potential losses which may arise from certain exposures in our insurance business. The economic benefit provided by these derivatives is similar to purchased reinsurance. For example, Chubb may enter into crop derivative contracts to protect underwriting results in the event of a significant decline in commodity prices. Also included within Other are certain life insurance products that meet the definition of a derivative instrument for accounting purposes. (iii) Convertible security investments A convertible security is a debt instrument or preferred stock that can be converted into a predetermined amount of the issuer’s equity. The convertible option is an embedded derivative within the host instruments which are classified in the investment portfolio as either available for sale or as an equity security. Chubb purchases convertible securities for their total return and not specifically for the conversion feature. (iv) TBA By acquiring TBAs, we make a commitment to purchase a future issuance of mortgage-backed securities. For the period between purchase of the TBAs and issuance of the underlying security, we account for our position as a derivative in the consolidated financial statements. Chubb purchases TBAs both for their total return and for the flexibility they provide related to our mortgage-backed security strategy. (v) GLB Under the GLB program, as the assuming entity, Chubb is obligated to provide coverage until the expiration or maturity of the underlying deferred annuity contracts or the expiry of the reinsurance treaty. Premiums received under the reinsurance treaties are classified as premium. Expected losses allocated to premiums received are classified as Future policy benefits and valued similar to GMDB reinsurance. Other changes in fair value, principally arising from changes in expected losses allocated to expected future premiums, are classified as Net realized gains (losses). Fair value represents management’s estimate of an exit price and thus, includes a risk margin. We may recognize a realized loss for other changes in fair value due to adverse changes in the capital markets (e.g., declining interest rates and/or declining equity markets) and changes in actual or estimated future policyholder behavior (e.g., increased annuitization or decreased lapse rates) although we expect the business to be profitable. We believe this presentation provides the most meaningful disclosure of changes in the underlying risk within the GLB reinsurance programs for a given reporting period. d) Fixed maturities At March 31, 2017 , we have commitments to purchase fixed income securities of $603 million over the next several years. In April 2017, we increased these commitments by $250 million , bringing our total commitments to $853 million . e) Other investments At March 31, 2017 , included in Other investments in the Consolidated balance sheets 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 $1.9 billion over the next several years. f) Taxation At March 31, 2017 , $18 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 and the closing of tax statute limitations. With few exceptions, Chubb is no longer subject to state and local or non-U.S. income tax examinations for years before 2009. g) Legal proceedings Our insurance subsidiaries are subject to claims litigation involving disputed interpretations of policy coverages and, in some jurisdictions, direct actions by allegedly-injured persons seeking damages from policyholders. These lawsuits, involving claims on policies issued by our subsidiaries which are typical to the insurance industry in general and in the normal course of business, are considered in our loss and loss expense reserves. In addition to claims litigation, we are subject to lawsuits and regulatory actions in the normal course of business that do not arise from or directly relate to claims on insurance policies. This category of business litigation typically involves, among other things, allegations of underwriting errors or misconduct, employment claims, regulatory activity, or disputes arising from our business ventures. In the opinion of management, our ultimate liability for these matters could be, but we believe is not likely to be, material to our consolidated financial condition and results of operations.

Shareholders' equity

Shareholders' equity	3 Months Ended
	Mar. 31, 2017
Stockholders' Equity Note [Abstract]
Shareholders' equity	Shareholders’ equity All of Chubb’s Common Shares are authorized under Swiss corporate law. Though the par value of Common Shares is stated in Swiss francs, Chubb continues to use U.S. dollars as its reporting currency for preparing consolidated financial statements. Under Swiss corporate law, dividends, including distributions through a reduction in par value (par value reduction) or from legal reserves, must be stated in Swiss francs though dividend payments are made by Chubb in U.S. dollars. At March 31, 2017, our Common Shares had a par value of CHF 24.15 per share. At our May 2016 and 2015 annual general meetings, our shareholders approved an annual dividend for the following year of up to $ 2.76 per share and $ 2.68 per share, respectively, which were paid in four quarterly installments of $ 0.69 per share and $ 0.67 per share, respectively, at dates determined by the Board of Directors (Board) after the annual general meetings by way of a distribution from capital contribution reserves, transferred to free reserves for payment. Dividend distributions per Common Share for the three months ended March 31, 2017 and 2016 were $ 0.69 (CHF 0.69 ) and $ 0.67 (CHF 0.66 ), per Common Share, respectively. Common Shares in treasury are used principally for issuance upon the exercise of employee stock options, grants of restricted stock, and purchases under the Employee Stock Purchase Plan (ESPP). At March 31, 2017 , 12,560,845 Common Shares remain in treasury after net shares redeemed under employee share-based compensation plans. Chubb Limited securities repurchase authorization There was no share repurchase program from January 2016 through October 2016. In November 2016, the Board authorized a share repurchase program of $1.0 billion of Chubb's Common Shares through December 31, 2017. Repurchases of Chubb's Common Shares conducted in a series of open market transactions from January 1, 2017 through May 3, 2017 under the Board authorization are as follows: (in millions of U.S. dollars, except share data) Three Months Ended March 31, 2017 April 1, 2017 through May 3, 2017 Number of shares repurchased 1,036,064 664,301 Cost of shares repurchased $ 140 $ 91 Repurchase authorization remaining at end of period $ 860 $ 769

Share-based compensation

Share-based compensation	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation	Share-based compensation The Chubb Limited 2016 Long-Term Incentive Plan (the 2016 LTIP) permits grants of incentive and non-qualified stock options; restricted stock and restricted stock units; and performance-based restricted stock awards. The incentive and non-qualified stock options are granted 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 and typically vest in equal annual installments over the vesting period, which is also the requisite service period. On February 23, 2017 , Chubb granted 2,065,620 stock options with a weighted-average grant date fair value of $22.97 each estimated using the Black-Scholes option pricing model. The service-based restricted stock and restricted stock units are generally granted with a 4-year vesting period, based on a graded vesting schedule. Performance-based restricted stock awards granted prior to January 2017 comprised target awards which have four installments that vest annually based on tangible book value (shareholders' equity less goodwill and intangible assets, net of tax) 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 terms of performance-based restricted stock awards granted beginning in January 2017 were updated to now include a 3-year cliff vesting provision in place of the 4-year graded vesting period. In addition, these awards now include an additional vesting criteria based on the P&C combined ratio compared to a defined group of peer companies as well as an additional vesting provision based on total shareholder return (TSR) compared to a defined group of peer companies. Chubb's restricted stock is granted at market close price on the grant date. On February 23, 2017 , Chubb granted 1,105,118 service-based restricted stock awards, 326,272 service-based restricted stock units, and 202,251 performance-based stock awards to employees and officers with a grant date fair value of $139.01 each. Each restricted stock unit represents our obligation to deliver to the holder one Common Share upon vesting.

Postretirement benefits Postret

Postretirement benefits Postretirement benefits	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Compensation and Employee Benefit Plans [Text Block]	Postretirement benefits The components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows: Three Months Ended March 31 Pension Benefits Other Postretirement Benefits U.S. Plans Non-U.S. Plans Total U.S. Plans Non-U.S. Plans Total (in millions of U.S. dollars) 2017 Service cost $ 16 $ 4 $ 20 $ — $ — $ — Interest cost 26 7 33 1 — 1 Expected return on plan assets (47 ) (10 ) (57 ) (1 ) — (1 ) Amortization of prior service cost — — — (23 ) — (23 ) Net periodic (benefit) cost $ (5 ) $ 1 $ (4 ) $ (23 ) $ — $ (23 ) 2016 Service cost $ 17 $ 5 $ 22 $ 2 $ — $ 2 Interest cost 27 8 35 5 — 5 Expected return on plan assets (37 ) (10 ) (47 ) (2 ) — (2 ) Amortization of net actuarial loss — 1 1 — — — Net periodic cost $ 7 $ 4 $ 11 $ 5 $ — $ 5

Segment information

Segment information	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Segment information	Segment information Chubb operates through six 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. Corporate primarily includes loss and loss expenses of asbestos and environmental (A&E) run-off liabilities, and the results of our non-insurance companies including Chubb Limited, Chubb Group Management and Holdings Ltd, and Chubb INA Holdings Inc. Our exposure to A&E claims principally arises out of liabilities acquired when we purchased Westchester Specialty in 1998, CIGNA’s P&C business in 1999, and legacy Chubb Corp run-off business in 2016. For segment reporting purposes, certain items are 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, other (income) expense, and amortization of purchased intangibles. 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 March 31, 2017, Life Insurance underwriting income of $64 million includes Net investment income of $75 million and gains from fair value changes in separate account assets of $30 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 March 31, 2017 (in millions of U.S. dollars) Net premiums written $ 2,742 $ 984 $ 61 $ 2,200 $ 199 $ 524 $ — $ 6,710 Net premiums earned 3,041 1,086 14 1,936 189 506 — 6,772 Losses and loss expenses 1,860 633 (73 ) 1,071 94 193 11 3,789 Policy benefits — — — — — 168 — 168 Policy acquisition costs 487 217 (1 ) 529 51 114 — 1,397 Administrative expenses 231 65 (5 ) 245 10 72 58 676 Underwriting income (loss) 463 171 93 91 34 (41 ) (69 ) 742 Net investment income (loss) 478 55 6 148 62 75 (79 ) 745 Other (income) expense 4 1 — (1 ) — (29 ) (45 ) (70 ) Amortization expense of purchased intangibles — 3 7 11 — 1 42 64 Segment income (loss) $ 937 $ 222 $ 92 $ 229 $ 96 $ 62 $ (145 ) $ 1,493 Net realized gains (losses) including OTTI (7 ) (7 ) Interest expense 154 154 Chubb integration expenses 111 111 Income tax expense 128 128 Net income (loss) $ (545 ) $ 1,093 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 March 31, 2016 (in millions of U.S. dollars) Net premiums written $ 2,302 $ 871 $ 64 $ 2,041 $ 201 $ 516 $ — $ 5,995 Net premiums earned 2,896 1,024 23 1,955 202 497 — 6,597 Losses and loss expenses 1,747 661 (30 ) 1,021 89 177 9 3,674 Policy benefits — — — — — 126 — 126 Policy acquisition costs 482 249 4 503 53 122 — 1,413 Administrative expenses 266 88 (4 ) 263 14 72 73 772 Underwriting income (loss) 401 26 53 168 46 — (82 ) 612 Net investment income (loss) 426 47 5 146 67 67 (84 ) 674 Other (income) expense — 1 — (5 ) (1 ) 6 27 28 Amortization expense (benefit) of purchased intangibles — 8 7 11 — 1 (20 ) 7 Segment income (loss) $ 827 $ 64 $ 51 $ 308 $ 114 $ 60 $ (173 ) $ 1,251 Net realized gains (losses) including OTTI (394 ) (394 ) Interest expense 146 146 Chubb integration expenses 148 148 Income tax expense 124 124 Net income (loss) $ (985 ) $ 439 Underwriting assets are reviewed in total by management for purposes of decision-making. Other than Unpaid losses and loss expenses, Reinsurance recoverables, Goodwill and Other intangible assets, Chubb does not allocate assets to its segments.

Earnings per share

Earnings per share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Earnings per share	Earnings per share Three Months Ended March 31 (in millions of U.S. dollars, except share and per share data) 2017 2016 Numerator: Net income $ 1,093 $ 439 Denominator: Denominator for basic earnings per share: Weighted-average shares outstanding 468,903,086 446,739,586 Denominator for diluted earnings per share: Share-based compensation plans 3,828,604 3,270,156 Weighted-average shares outstanding and assumed conversions 472,731,690 450,009,742 Basic earnings per share $ 2.33 $ 0.98 Diluted earnings per share $ 2.31 $ 0.97 Potential anti-dilutive share conversions 969,654 2,074,308 Excluded from weighted-average shares outstanding and assumed conversions is the impact of securities that would have been anti-dilutive during the respective periods.

Information provided in connect

Information provided in connection with outstanding debt of subsidiaries	3 Months Ended
	Mar. 31, 2017
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 The following tables present condensed consolidating financial information at March 31, 2017 and December 31, 2016 , and for the three months ended March 31, 2017 and 2016 for Chubb Limited (Parent Guarantor) and Chubb INA Holdings Inc. (Subsidiary Issuer). The Subsidiary Issuer is an indirect 100 percent-owned subsidiary of the Parent Guarantor. The Parent Guarantor fully and unconditionally guarantees certain of the debt of the Subsidiary Issuer. Condensed consolidating financial information of the Parent Guarantor and Subsidiary Issuer are presented on the equity method of accounting. The revenues and expenses and cash flows of the subsidiaries of the Subsidiary Issuer are presented in the Other Chubb Limited Subsidiaries column on a combined basis. Condensed Consolidating Balance Sheet at March 31, 2017 (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 $ 304 $ 99,162 $ — $ 99,491 Cash (1) 6 1 2,328 (1,272 ) 1,063 Insurance and reinsurance balances receivable — — 10,956 (2,076 ) 8,880 Reinsurance recoverable on losses and loss expenses — — 24,015 (10,246 ) 13,769 Reinsurance recoverable on policy benefits — — 1,145 (958 ) 187 Value of business acquired — — 345 — 345 Goodwill and other intangible assets — — 22,061 — 22,061 Investments in subsidiaries 39,156 50,242 — (89,398 ) — Due from subsidiaries and affiliates, net 10,396 — — (10,396 ) — Other assets 4 519 18,642 (3,994 ) 15,171 Total assets $ 49,587 $ 51,066 $ 178,654 $ (118,340 ) $ 160,967 Liabilities Unpaid losses and loss expenses $ — $ — $ 70,269 $ (9,690 ) $ 60,579 Unearned premiums — — 18,343 (3,486 ) 14,857 Future policy benefits — — 6,044 (958 ) 5,086 Due to subsidiaries and affiliates, net — 10,028 368 (10,396 ) — Affiliated notional cash pooling programs (1) — 1,272 — (1,272 ) — Repurchase agreements — — 1,404 — 1,404 Short-term debt — 300 — — 300 Long-term debt — 12,289 11 — 12,300 Trust preferred securities — 308 — — 308 Other liabilities 363 1,699 17,987 (3,140 ) 16,909 Total liabilities 363 25,896 114,426 (28,942 ) 111,743 Total shareholders’ equity 49,224 25,170 64,228 (89,398 ) 49,224 Total liabilities and shareholders’ equity $ 49,587 $ 51,066 $ 178,654 $ (118,340 ) $ 160,967 (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 March 31, 2017 , the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Balance Sheet at December 31, 2016 (in millions of U.S. dollars) Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated Assets Investments $ 27 $ 485 $ 98,582 $ — $ 99,094 Cash (1) 1 1 1,965 (982 ) 985 Insurance and reinsurance balances receivable — — 10,498 (1,528 ) 8,970 Reinsurance recoverable on losses and loss expenses — — 24,496 (10,919 ) 13,577 Reinsurance recoverable on policy benefits — — 1,153 (971 ) 182 Value of business acquired — — 355 — 355 Goodwill and other intangible assets — — 22,095 — 22,095 Investments in subsidiaries 38,408 49,509 — (87,917 ) — Due from subsidiaries and affiliates, net 10,482 — — (10,482 ) — Other assets 3 436 18,442 (4,353 ) 14,528 Total assets $ 48,921 $ 50,431 $ 177,586 $ (117,152 ) $ 159,786 Liabilities Unpaid losses and loss expenses $ — $ — $ 70,683 $ (10,143 ) $ 60,540 Unearned premiums — — 18,538 (3,759 ) 14,779 Future policy benefits — — 6,007 (971 ) 5,036 Due to subsidiaries and affiliates, net — 10,209 273 (10,482 ) — Affiliated notional cash pooling programs (1) 363 619 — (982 ) — Repurchase agreements — — 1,403 — 1,403 Short-term debt — 500 — — 500 Long-term debt — 12,599 11 — 12,610 Trust preferred securities — 308 — — 308 Other liabilities 283 1,582 17,368 (2,898 ) 16,335 Total liabilities 646 25,817 114,283 (29,235 ) 111,511 Total shareholders’ equity 48,275 24,614 63,303 (87,917 ) 48,275 Total liabilities and shareholders’ equity $ 48,921 $ 50,431 $ 177,586 $ (117,152 ) $ 159,786 (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, 2016 , the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Statements of Operations and Comprehensive Income For the Three Months Ended March 31, 2017 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 $ — $ — $ 6,710 $ — $ 6,710 Net premiums earned — — 6,772 — 6,772 Net investment income — 3 742 — 745 Equity in earnings of subsidiaries 1,027 701 — (1,728 ) — Net realized gains (losses) including OTTI — (13 ) 6 — (7 ) Losses and loss expenses — — 3,789 — 3,789 Policy benefits — — 168 — 168 Policy acquisition costs and administrative expenses 18 14 2,041 — 2,073 Interest (income) expense (84 ) 221 17 — 154 Other (income) expense (6 ) 15 (79 ) — (70 ) Amortization of purchased intangibles — — 64 — 64 Chubb integration expenses — 49 62 — 111 Income tax expense (benefit) 6 (112 ) 234 — 128 Net income $ 1,093 $ 504 $ 1,224 $ (1,728 ) $ 1,093 Comprehensive income $ 1,407 $ 791 $ 1,538 $ (2,329 ) $ 1,407 Condensed Consolidating Statements of Operations and Comprehensive Income For the Three Months Ended March 31, 2016 Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 5,995 $ — $ 5,995 Net premiums earned — — 6,597 — 6,597 Net investment income 1 4 669 — 674 Equity in earnings of subsidiaries 375 506 — (881 ) — Net realized gains (losses) including OTTI — — (394 ) — (394 ) Losses and loss expenses — — 3,674 — 3,674 Policy benefits — — 126 — 126 Policy acquisition costs and administrative expenses 17 36 2,132 — 2,185 Interest (income) expense (80 ) 215 11 — 146 Other (income) expense (9 ) 10 27 — 28 Amortization of purchased intangibles — — 7 — 7 Chubb integration expenses 3 137 8 — 148 Income tax expense (benefit) 6 (150 ) 268 — 124 Net income $ 439 $ 262 $ 619 $ (881 ) $ 439 Comprehensive income (loss) $ 1,541 $ 1,056 $ 1,721 $ (2,777 ) $ 1,541 Condensed Consolidating Statement of Cash Flows Three Months Ended March 31, 2017 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 (used for) operating activities $ 584 $ (156 ) $ 1,081 $ (496 ) $ 1,013 Cash flows from investing activities Purchases of fixed maturities available for sale — (4 ) (6,246 ) — (6,250 ) Purchases of fixed maturities held to maturity — — (157 ) — (157 ) Purchases of equity securities — — (37 ) — (37 ) Sales of fixed maturities available for sale — — 3,395 — 3,395 Sales of equity securities — — 46 — 46 Maturities and redemptions of fixed maturities available for sale — 7 2,536 — 2,543 Maturities and redemptions of fixed maturities held to maturity — — 240 — 240 Net change in short-term investments — 173 59 — 232 Net derivative instruments settlements — (2 ) (87 ) — (89 ) Other — — 17 — 17 Net cash flows from (used for) investing activities — 174 (234 ) — (60 ) Cash flows from financing activities Dividends paid on Common Shares (324 ) — — — (324 ) Common Shares repurchased — — (128 ) — (128 ) Repayment of long-term debt — (500 ) — — (500 ) Proceeds from issuance of repurchase agreements — — 753 — 753 Repayment of repurchase agreements — — (752 ) — (752 ) Proceeds from share-based compensation plans — — 42 — 42 Dividend to parent company — — (496 ) 496 — Advances (to) from affiliates 108 (171 ) 63 — — Net proceeds from (payments to) affiliated notional cash pooling programs (1) (363 ) 653 — (290 ) — Policyholder contract deposits — — 109 — 109 Policyholder contract withdrawals — — (58 ) — (58 ) Net cash flows used for financing activities (579 ) (18 ) (467 ) 206 (858 ) Effect of foreign currency rate changes on cash and cash equivalents — — (17 ) — (17 ) Net increase in cash 5 — 363 (290 ) 78 Cash – beginning of period (1) 1 1 1,965 (982 ) 985 Cash – end of period (1) $ 6 $ 1 $ 2,328 $ (1,272 ) $ 1,063 (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2017 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Statement of Cash Flows Three Months Ended March 31, 2016 Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated (in millions of U.S. dollars) Net cash flows from operating activities $ 3,272 $ 3,109 $ 1,011 $ (6,372 ) $ 1,020 Cash flows from investing activities Purchases of fixed maturities available for sale — — (8,104 ) — (8,104 ) Purchases of fixed maturities held to maturity — — (77 ) — (77 ) Purchases of equity securities — — (33 ) — (33 ) Sales of fixed maturities available for sale — — 6,329 — 6,329 Sales of equity securities — — 761 — 761 Maturities and redemptions of fixed maturities available for sale — — 1,553 — 1,553 Maturities and redemptions of fixed maturities held to maturity — — 249 — 249 Net change in short-term investments — 7,788 4,144 — 11,932 Net derivative instruments settlements — — (22 ) — (22 ) Acquisition of subsidiaries (net of cash acquired of $57) — (14,282 ) 20 — (14,262 ) Capital contribution (2,330 ) — (2,330 ) 4,660 — Other — — 59 — 59 Net cash flows from (used for) investing activities (2,330 ) (6,494 ) 2,549 4,660 (1,615 ) Cash flows from financing activities Dividends paid on Common Shares (218 ) — — — (218 ) Proceeds from issuance of repurchase agreements — — 853 — 853 Repayment of repurchase agreements — — (853 ) — (853 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 51 — 51 Dividend to parent company — — (6,372 ) 6,372 — Advances (to) from affiliates (362 ) 350 12 — — Capital contribution — 2,330 2,330 (4,660 ) — Net proceeds from (payments to) affiliated notional cash pooling programs (1) (361 ) 710 — (349 ) — Policyholder contract deposits — — 118 — 118 Policyholder contract withdrawals — — (49 ) — (49 ) Other — (4 ) — — (4 ) Net cash flows from (used for) financing activities (941 ) 3,386 (3,910 ) 1,363 (102 ) Effect of foreign currency rate changes on cash and cash equivalents — — 13 — 13 Net increase (decrease) in cash 1 1 (337 ) (349 ) (684 ) Cash – beginning of period (1) 1 2 2,743 (971 ) 1,775 Cash – end of period (1) $ 2 $ 3 $ 2,406 $ (1,320 ) $ 1,091 (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 and December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

General (Policies)

General (Policies)	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of presentation	a) Basis of presentation 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. Chubb operates 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. Refer to Note 10 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 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 2016 Form 10-K.
Accounting guidance adopted in 2017	d) Accounting guidance adopted in 2017 Stock Compensation Effective January 2017, we prospectively adopted new guidance on stock compensation which requires recognition of the excess tax benefits or deficiencies of share-based compensation awards to employees through net income rather than through additional paid in capital. The calculation of the excess tax benefits or deficiencies is based on the difference between the market value of a stock award at the date of vesting, or at the time of exercise for a stock option, compared to the grant date fair value recognized as compensation expense in the Consolidated statements of operations. For the three months ended March 31, 2017, the excess tax benefit recorded to Income tax expense on the Consolidated statement of operations was $ 25 million . Additionally, the guidance allows for an election to account for forfeitures related to share-based payments either as they occur or through an estimation method. We elected to retain our current accounting for compensation expense using a forfeiture estimation process.
Accounting guidance not yet adopted	e) Accounting guidance not yet adopted Revenue from Contracts with Customers In May 2014, the Financial Accounting Standards Board (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 given that the majority of our business is outside the scope of this guidance. 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 (AFS) debt securities in combination with other deferred tax assets. The standard will be 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 debt 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 potential credit loss exists. The AFS debt security model will also require the use of a valuation allowance as compared to the current practice of writing down the asset. The standard will be 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. 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 will be 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. Goodwill Impairment In January 2017, the FASB issued updated guidance on goodwill impairment testing that eliminates Step 2 of the goodwill impairment test requiring entities to calculate the implied fair value of goodwill through a hypothetical purchase price allocation. Under the updated guidance, impairment will now be recognized as the amount by which a reporting unit’s carrying value exceeds its fair value. The standard will be effective for us in the first quarter of 2020 on a prospective basis with early adoption permitted. We do not expect the adoption of this guidance to have a material effect on our financial condition and results of operations.

Acquisitions Acquisitions (Tabl

Acquisitions Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2017
Acquisition [Abstract]
Results of Operations From Date of Business Combination [Table Text Block]	The following table summarizes the results of the acquired Chubb Corp operations from January 14, 2016 to March 31, 2016 included within our 2016 Consolidated statement of operations: (in millions of U.S. dollars) January 14, 2016 to March 31, 2016 Total revenues $ 2,487 Net income $ 255
Pro Forma Financial Information for the Chubb Corp Acquisition [Table Text Block]	The following table provides supplemental unaudited pro forma consolidated information for the three months ended March 31, 2016 , 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 (in millions of U.S. dollars, except per share data) March 31, 2016 Total revenues $ 7,322 Net income $ 534 Earnings per share Basic earnings per share $ 1.14 Diluted earnings per share $ 1.14

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities and Related OTTI Recognized in AOCI	March 31 December 31 (in millions of U.S. dollars) 2017 2016 Cost $ 699 $ 706 Gross unrealized appreciation 144 129 Gross unrealized depreciation (8 ) (21 ) Fair value $ 835 $ 814 March 31, 2017 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 $ 2,900 $ 34 $ (35 ) $ 2,899 $ — Foreign 20,795 651 (79 ) 21,367 (3 ) Corporate securities 24,372 603 (133 ) 24,842 (8 ) Mortgage-backed securities 14,217 127 (198 ) 14,146 (1 ) States, municipalities, and political subdivisions 17,673 81 (202 ) 17,552 — $ 79,957 $ 1,496 $ (647 ) $ 80,806 $ (12 ) Held to maturity U.S. Treasury and agency $ 601 $ 10 $ (3 ) $ 608 $ — Foreign 625 27 (1 ) 651 — Corporate securities 2,710 50 (20 ) 2,740 — Mortgage-backed securities 1,319 35 — 1,354 — States, municipalities, and political subdivisions 5,264 37 (50 ) 5,251 — $ 10,519 $ 159 $ (74 ) $ 10,604 $ — December 31, 2016 Amortized Cost Gross Unrealized Appreciation Gross Unrealized Depreciation Fair Value OTTI Recognized in AOCI (in millions of U.S. dollars) Available for sale U.S. Treasury and agency $ 2,883 $ 32 $ (45 ) $ 2,870 $ — Foreign 20,929 636 (125 ) 21,440 (5 ) Corporate securities 23,736 580 (167 ) 24,149 (8 ) Mortgage-backed securities 14,066 135 (194 ) 14,007 (1 ) States, municipalities, and political subdivisions 17,922 72 (345 ) 17,649 — $ 79,536 $ 1,455 $ (876 ) $ 80,115 $ (14 ) Held to maturity U.S. Treasury and agency $ 655 $ 9 $ (3 ) $ 661 $ — Foreign 640 28 (1 ) 667 — Corporate securities 2,771 50 (26 ) 2,795 — Mortgage-backed securities 1,393 35 — 1,428 — States, municipalities, and political subdivisions 5,185 26 (92 ) 5,119 — $ 10,644 $ 148 $ (122 ) $ 10,670 $ —
Schedule Of Amortized Cost And Fair Value Of HTM Fixed Maturities And Related OTTI Recognized In AOCI	March 31, 2017 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 $ 2,900 $ 34 $ (35 ) $ 2,899 $ — Foreign 20,795 651 (79 ) 21,367 (3 ) Corporate securities 24,372 603 (133 ) 24,842 (8 ) Mortgage-backed securities 14,217 127 (198 ) 14,146 (1 ) States, municipalities, and political subdivisions 17,673 81 (202 ) 17,552 — $ 79,957 $ 1,496 $ (647 ) $ 80,806 $ (12 ) Held to maturity U.S. Treasury and agency $ 601 $ 10 $ (3 ) $ 608 $ — Foreign 625 27 (1 ) 651 — Corporate securities 2,710 50 (20 ) 2,740 — Mortgage-backed securities 1,319 35 — 1,354 — States, municipalities, and political subdivisions 5,264 37 (50 ) 5,251 — $ 10,519 $ 159 $ (74 ) $ 10,604 $ — December 31, 2016 Amortized Cost Gross Unrealized Appreciation Gross Unrealized Depreciation Fair Value OTTI Recognized in AOCI (in millions of U.S. dollars) Available for sale U.S. Treasury and agency $ 2,883 $ 32 $ (45 ) $ 2,870 $ — Foreign 20,929 636 (125 ) 21,440 (5 ) Corporate securities 23,736 580 (167 ) 24,149 (8 ) Mortgage-backed securities 14,066 135 (194 ) 14,007 (1 ) States, municipalities, and political subdivisions 17,922 72 (345 ) 17,649 — $ 79,536 $ 1,455 $ (876 ) $ 80,115 $ (14 ) Held to maturity U.S. Treasury and agency $ 655 $ 9 $ (3 ) $ 661 $ — Foreign 640 28 (1 ) 667 — Corporate securities 2,771 50 (26 ) 2,795 — Mortgage-backed securities 1,393 35 — 1,428 — States, municipalities, and political subdivisions 5,185 26 (92 ) 5,119 — $ 10,644 $ 148 $ (122 ) $ 10,670 $ —
Schedule Of Fixed Maturities By Contractual Maturity	The following table presents fixed maturities by contractual maturity: March 31 December 31 2017 2016 (in millions of U.S. dollars) Amortized Cost Fair Value Amortized Cost Fair Value Available for sale Due in 1 year or less $ 3,828 $ 3,851 $ 3,892 $ 3,913 Due after 1 year through 5 years 23,950 24,413 24,027 24,429 Due after 5 years through 10 years 27,693 27,955 27,262 27,379 Due after 10 years 10,269 10,441 10,289 10,387 65,740 66,660 65,470 66,108 Mortgage-backed securities 14,217 14,146 14,066 14,007 $ 79,957 $ 80,806 $ 79,536 $ 80,115 Held to maturity Due in 1 year or less $ 481 $ 486 $ 430 $ 435 Due after 1 year through 5 years 2,648 2,695 2,646 2,691 Due after 5 years through 10 years 2,973 2,980 2,969 2,944 Due after 10 years 3,098 3,089 3,206 3,172 9,200 9,250 9,251 9,242 Mortgage-backed securities 1,319 1,354 1,393 1,428 $ 10,519 $ 10,604 $ 10,644 $ 10,670
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 March 31 (in millions of U.S. dollars) 2017 2016 Fixed maturities: OTTI on fixed maturities, gross $ (6 ) $ (67 ) OTTI on fixed maturities recognized in OCI (pre-tax) — 8 OTTI on fixed maturities, net (6 ) (59 ) Gross realized gains excluding OTTI 34 65 Gross realized losses excluding OTTI (40 ) (196 ) Total fixed maturities (12 ) (190 ) Equity securities: OTTI on equity securities (5 ) (1 ) Gross realized gains excluding OTTI 9 40 Gross realized losses excluding OTTI — (1 ) Total equity securities 4 38 OTTI on other investments (8 ) (3 ) Foreign exchange gains (losses) (19 ) 39 Investment and embedded derivative instruments 6 (39 ) Fair value adjustments on insurance derivative 93 (228 ) S&P put options and futures (74 ) (15 ) Other derivative instruments 2 (2 ) Other 1 6 Net realized gains (losses) $ (7 ) $ (394 )
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 March 31 (in millions of U.S. dollars) 2017 2016 Balance of credit losses related to securities still held – beginning of period $ 35 $ 53 Additions where no OTTI was previously recorded — 11 Additions where an OTTI was previously recorded 1 6 Reductions for securities sold during the period (4 ) (13 ) Balance of credit losses related to securities still held – end of period $ 32 $ 57
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 March 31, 2017 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 $ 2,011 $ (38 ) $ — $ — $ 2,011 $ (38 ) Foreign 4,428 (59 ) 684 (21 ) 5,112 (80 ) Corporate securities 6,139 (121 ) 491 (32 ) 6,630 (153 ) Mortgage-backed securities 8,735 (195 ) 131 (3 ) 8,866 (198 ) States, municipalities, and political subdivisions 16,731 (248 ) 123 (4 ) 16,854 (252 ) Total fixed maturities 38,044 (661 ) 1,429 (60 ) 39,473 (721 ) Equity securities 150 (8 ) — — 150 (8 ) Other investments 84 (9 ) — — 84 (9 ) Total $ 38,278 $ (678 ) $ 1,429 $ (60 ) $ 39,707 $ (738 ) 0 – 12 Months Over 12 Months Total December 31, 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 $ 2,216 $ (48 ) $ — $ — $ 2,216 $ (48 ) Foreign 5,918 (99 ) 386 (27 ) 6,304 (126 ) Corporate securities 7,021 (149 ) 641 (44 ) 7,662 (193 ) Mortgage-backed securities 8,638 (189 ) 234 (5 ) 8,872 (194 ) States, municipalities, and political subdivisions 19,448 (435 ) 49 (2 ) 19,497 (437 ) Total fixed maturities 43,241 (920 ) 1,310 (78 ) 44,551 (998 ) Equity securities 199 (21 ) — — 199 (21 ) Other investments 201 (18 ) — — 201 (18 ) Total $ 43,641 $ (959 ) $ 1,310 $ (78 ) $ 44,951 $ (1,037 )
Schedule Of Components Of Restricted Assets	The following table presents the components of restricted assets: March 31 December 31 (in millions of U.S. dollars) 2017 2016 Trust funds $ 14,359 $ 13,880 Deposits with U.S. regulatory authorities 2,356 2,203 Deposits with non-U.S. regulatory authorities 2,192 2,191 Assets pledged under repurchase agreements 1,453 1,461 Other pledged assets 366 435 $ 20,726 $ 20,170

Fair value measurements (Tables

Fair value measurements (Tables)	3 Months Ended
	Mar. 31, 2017
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 March 31, 2017 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available for sale U.S. Treasury and agency $ 2,222 $ 677 $ — $ 2,899 Foreign — 21,287 80 21,367 Corporate securities — 24,105 737 24,842 Mortgage-backed securities — 14,101 45 14,146 States, municipalities, and political subdivisions — 17,552 — 17,552 2,222 77,722 862 80,806 Equity securities 794 — 41 835 Short-term investments 1,548 1,211 21 2,780 Other investments (1) 425 280 232 937 Securities lending collateral — 1,071 — 1,071 Investment derivative instruments 15 — — 15 Other derivative instruments 8 — — 8 Separate account assets 1,970 97 — 2,067 Total assets measured at fair value (1) $ 6,982 $ 80,381 $ 1,156 $ 88,519 Liabilities: Investment derivative instruments $ 30 $ — $ — $ 30 Other derivative instruments — — 11 11 GLB (2) — — 466 466 Total liabilities measured at fair value $ 30 $ — $ 477 $ 507 (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $ 3,594 million and other investments of $ 20 million at March 31, 2017 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. December 31, 2016 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available for sale U.S. Treasury and agency $ 2,175 $ 695 $ — $ 2,870 Foreign — 21,366 74 21,440 Corporate securities — 23,468 681 24,149 Mortgage-backed securities — 13,962 45 14,007 States, municipalities, and political subdivisions — 17,649 — 17,649 2,175 77,140 800 80,115 Equity securities 773 — 41 814 Short-term investments 1,757 1,220 25 3,002 Other investments (1) 384 259 225 868 Securities lending collateral — 1,092 — 1,092 Investment derivative instruments 31 — — 31 Other derivative instruments 3 — — 3 Separate account assets 1,784 95 — 1,879 Total assets measured at fair value (1) $ 6,907 $ 79,806 $ 1,091 $ 87,804 Liabilities: Investment derivative instruments $ 54 $ — $ — $ 54 Other derivative instruments — — 13 13 GLB (2) — — 559 559 Total liabilities measured at fair value $ 54 $ — $ 572 $ 626 (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $3,626 million and other investments of $25 million at December 31, 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.
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: March 31 December 31 Expected Liquidation Period of Underlying Assets 2017 2016 (in millions of U.S. dollars) Fair Value Maximum Future Funding Commitments Fair Value Maximum Future Funding Commitments Financial 5 to 9 Years $ 548 $ 398 $ 548 $ 428 Real Assets 3 to 7 Years 612 186 536 230 Distressed 5 to 9 Years 350 179 485 179 Private Credit 3 to 7 Years 244 248 236 259 Traditional 3 to 9 Years 1,563 870 1,550 930 Vintage 1 to 2 Years 18 14 21 14 Investment funds Not Applicable 259 — 251 — $ 3,594 $ 1,895 $ 3,627 $ 2,040
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 March 31, 2017 December 31, 2016 GLB (1) $ 466 $ 559 Actuarial model Lapse rate 3% – 34% Annuitization rate 0% – 78% (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) March 31, 2017 Foreign Corporate securities MBS (in millions of U.S. dollars) Balance – beginning of period $ 74 $ 681 $ 45 $ 41 $ 25 $ 225 $ 13 $ 559 Transfers into Level 3 — 29 — — — — — — Transfers out of Level 3 — (54 ) — — — — — — Change in Net Unrealized Gains (Losses) included in OCI (1 ) (8 ) — — — 4 — — Net Realized Gains/Losses (1 ) (1 ) — — — — (2 ) (93 ) Purchases 14 156 1 — 7 8 — — Sales (3 ) (27 ) (1 ) — — — — — Settlements (3 ) (39 ) — — (11 ) (4 ) — — Balance – end of period $ 80 $ 737 $ 45 $ 41 $ 21 $ 233 $ 11 $ 466 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ — $ — $ — $ — $ — $ (2 ) $ (93 ) (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 $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 million, respectively. Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity Other Other derivative instruments GLB (1) March 31, 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 6 16 — — — — — Transfers out of Level 3 (2 ) — — — — — — Change in Net Unrealized Gains (Losses) included in OCI 6 2 — — — — — Net Realized Gains/Losses (5 ) (6 ) — — — 2 230 Purchases (2) 5 93 — 13 6 2 — Sales (1 ) (14 ) (5 ) — — — — Settlements (4 ) (4 ) — — (7 ) — — Balance – end of period $ 62 $ 261 $ 48 $ 29 $ 211 $ 10 $ 839 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (4 ) $ (7 ) $ — $ — $ — $ 2 $ 230 (1) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $1.1 billion at March 31, 2016 , and $888 million at December 31, 2015, which includes a fair value derivative adjustment of $839 million and $609 million, respectively. (2) Includes acquired invested assets as a result of the Chubb Corp acquisition.
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) March 31, 2017 Foreign Corporate securities MBS (in millions of U.S. dollars) Balance – beginning of period $ 74 $ 681 $ 45 $ 41 $ 25 $ 225 $ 13 $ 559 Transfers into Level 3 — 29 — — — — — — Transfers out of Level 3 — (54 ) — — — — — — Change in Net Unrealized Gains (Losses) included in OCI (1 ) (8 ) — — — 4 — — Net Realized Gains/Losses (1 ) (1 ) — — — — (2 ) (93 ) Purchases 14 156 1 — 7 8 — — Sales (3 ) (27 ) (1 ) — — — — — Settlements (3 ) (39 ) — — (11 ) (4 ) — — Balance – end of period $ 80 $ 737 $ 45 $ 41 $ 21 $ 233 $ 11 $ 466 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ — $ — $ — $ — $ — $ (2 ) $ (93 ) (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 $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 million, respectively. Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity Other Other derivative instruments GLB (1) March 31, 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 6 16 — — — — — Transfers out of Level 3 (2 ) — — — — — — Change in Net Unrealized Gains (Losses) included in OCI 6 2 — — — — — Net Realized Gains/Losses (5 ) (6 ) — — — 2 230 Purchases (2) 5 93 — 13 6 2 — Sales (1 ) (14 ) (5 ) — — — — Settlements (4 ) (4 ) — — (7 ) — — Balance – end of period $ 62 $ 261 $ 48 $ 29 $ 211 $ 10 $ 839 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ (4 ) $ (7 ) $ — $ — $ — $ 2 $ 230 (1) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $1.1 billion at March 31, 2016 , and $888 million at December 31, 2015, which includes a fair value derivative adjustment of $839 million and $609 million, respectively. (2) Includes acquired invested assets as a result of the Chubb Corp acquisition.
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: March 31, 2017 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 $ 518 $ 90 $ — $ 608 $ 601 Foreign — 651 — 651 625 Corporate securities — 2,728 12 2,740 2,710 Mortgage-backed securities — 1,354 — 1,354 1,319 States, municipalities, and political subdivisions — 5,251 — 5,251 5,264 Total assets $ 518 $ 10,074 $ 12 $ 10,604 $ 10,519 Liabilities: Repurchase agreements $ — $ 1,404 $ — $ 1,404 $ 1,404 Short-term debt — 312 — 312 300 Long-term debt — 12,757 — 12,757 12,300 Trust preferred securities — 458 — 458 308 Total liabilities $ — $ 14,931 $ — $ 14,931 $ 14,312 December 31, 2016 Fair Value Carrying Value (in millions of U.S. dollars) Level 1 Level 2 Level 3 Total Assets: Fixed maturities held to maturity U.S. Treasury and agency $ 555 $ 106 $ — $ 661 $ 655 Foreign — 667 — 667 640 Corporate securities — 2,782 13 2,795 2,771 Mortgage-backed securities — 1,428 — 1,428 1,393 States, municipalities, and political subdivisions — 5,119 — 5,119 5,185 Total assets $ 555 $ 10,102 $ 13 $ 10,670 $ 10,644 Liabilities: Repurchase agreements $ — $ 1,403 $ — $ 1,403 $ 1,403 Short-term debt — 503 — 503 500 Long-term debt — 12,998 — 12,998 12,610 Trust preferred securities — 456 — 456 308 Total liabilities $ — $ 15,360 $ — $ 15,360 $ 14,821

Unpaid losses and loss expens26

Unpaid losses and loss expenses Unpaid losses and loss expenses (Tables)	3 Months Ended
	Mar. 31, 2017
Liability for Claims and Claims Adjustment Expense [Abstract]
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]	The following table presents a reconciliation of beginning and ending Unpaid losses and loss expenses: Three Months Ended March 31 (in millions of U.S. dollars) 2017 2016 Gross unpaid losses and loss expenses – beginning of period $ 60,540 $ 37,303 Reinsurance recoverable on unpaid losses (1) (12,708 ) (10,741 ) Net unpaid losses and loss expenses – beginning of period 47,832 26,562 Acquisition of subsidiaries — 21,363 Total 47,832 47,925 Net losses and loss expenses incurred in respect of losses occurring in: Current year 4,078 3,965 Prior years (2) (289 ) (291 ) Total 3,789 3,674 Net losses and loss expenses paid in respect of losses occurring in: Current year 798 586 Prior years 3,109 2,963 Total 3,907 3,549 Foreign currency revaluation and other 54 29 Net unpaid losses and loss expenses – end of period 47,768 48,079 Reinsurance recoverable on unpaid losses (1) 12,811 12,127 Gross unpaid losses and loss expenses – end of period $ 60,579 $ 60,206 (1) Net of provision for uncollectible reinsurance. (2) Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, and earned premiums.

Commitments, contingencies, a27

Commitments, contingencies, and guarantees (Tables)	3 Months Ended
	Mar. 31, 2017
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: March 31, 2017 December 31, 2016 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) $ 12 $ (26 ) $ 2,303 $ 25 $ (50 ) $ 2,220 Cross-currency swaps OA / (AP) — — 95 — — 95 Options/Futures contracts on notes and bonds OA / (AP) 3 (4 ) 834 6 (4 ) 2,344 Convertible securities (1) FM AFS / ES 2 — 7 2 — 7 $ 17 $ (30 ) $ 3,239 $ 33 $ (54 ) $ 4,666 Other derivative instruments Futures contracts on equities (2) OA / (AP) $ 4 $ — $ 1,391 $ 1 $ — $ 1,316 Other OA / (AP) 4 (11 ) 254 2 (13 ) 214 $ 8 $ (11 ) $ 1,645 $ 3 $ (13 ) $ 1,530 GLB (3) (AP) / (FPB) $ — $ (774 ) $ 1,186 $ — $ (853 ) $ 1,264 (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. 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 March 31 December 31 2017 2016 (in millions of U.S. dollars) Overnight and Continuous Collateral held under securities lending agreements: Cash $ 570 $ 423 U.S. Treasury and agency 22 54 Foreign 233 578 Corporate securities — 37 Mortgage-backed securities 33 — Equity securities 213 — $ 1,071 $ 1,092 Gross amount of recognized liability for securities lending payable $ 1,072 $ 1,093 Difference (1) $ (1 ) $ (1 ) (1) The carrying value of the securities lending collateral held is $ 1 million lower than the securities lending payable at both March 31, 2017 and December 31, 2016, due to accrued interest recorded in the securities lending payable. At March 31, 2017 and December 31, 2016, our repurchase agreement obligations of $1,404 million and $1,403 million , respectively, were fully collateralized. In contrast to securities lending programs, the use of cash received is not restricted for the repurchase obligations. The fair value of the underlying securities sold remains in Fixed maturities available for sale and Equity securities and the repurchase agreement obligation is recorded in Repurchase agreements in the Consolidated balance sheets. The following table presents the carrying value of collateral pledged under repurchase agreements by investment category and remaining contractual maturity of the underlying agreements: Remaining contractual maturity March 31, 2017 December 31, 2016 Up to 30 Days Greater than 90 Days Total Up to 30 Days Greater than 90 Days Total (in millions of U.S. dollars) Collateral pledged under repurchase agreements: Cash $ — $ — $ — $ — $ 1 $ 1 U.S. Treasury and agency 9 236 245 230 10 240 Mortgage-backed securities 360 848 1,208 339 881 1,220 $ 369 $ 1,084 $ 1,453 $ 569 $ 892 $ 1,461 Gross amount of recognized liabilities for repurchase agreements $ 1,404 $ 1,403 Difference (1) $ 49 $ 58
Secured Borrowings Securities Lending Table Text Block [Table Text Block]	Remaining contractual maturity March 31, 2017 December 31, 2016 Up to 30 Days Greater than 90 Days Total Up to 30 Days Greater than 90 Days Total (in millions of U.S. dollars) Collateral pledged under repurchase agreements: Cash $ — $ — $ — $ — $ 1 $ 1 U.S. Treasury and agency 9 236 245 230 10 240 Mortgage-backed securities 360 848 1,208 339 881 1,220 $ 369 $ 1,084 $ 1,453 $ 569 $ 892 $ 1,461 Gross amount of recognized liabilities for repurchase agreements $ 1,404 $ 1,403 Difference (1) $ 49 $ 58
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 March 31 (in millions of U.S. dollars) 2017 2016 Investment and embedded derivative instruments Foreign currency forward contracts $ 14 $ (10 ) All other futures contracts and options (8 ) (34 ) Convertible securities (1) — 5 Total investment and embedded derivative instruments $ 6 $ (39 ) GLB and other derivative instruments GLB (2) $ 93 $ (228 ) Futures contracts on equities (3) (74 ) (15 ) Other 2 (2 ) Total GLB and other derivative instruments $ 21 $ (245 ) $ 27 $ (284 ) (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)	3 Months Ended
	Mar. 31, 2017
Stockholders' Equity Note [Abstract]
Share Repurchase Program [Table Text Block]	Repurchases of Chubb's Common Shares conducted in a series of open market transactions from January 1, 2017 through May 3, 2017 under the Board authorization are as follows: (in millions of U.S. dollars, except share data) Three Months Ended March 31, 2017 April 1, 2017 through May 3, 2017 Number of shares repurchased 1,036,064 664,301 Cost of shares repurchased $ 140 $ 91 Repurchase authorization remaining at end of period $ 860 $ 769

Postretirement benefits (Tables

Postretirement benefits (Tables)	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Schedule of Net Benefit Costs [Table Text Block]	he components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows: Three Months Ended March 31 Pension Benefits Other Postretirement Benefits U.S. Plans Non-U.S. Plans Total U.S. Plans Non-U.S. Plans Total (in millions of U.S. dollars) 2017 Service cost $ 16 $ 4 $ 20 $ — $ — $ — Interest cost 26 7 33 1 — 1 Expected return on plan assets (47 ) (10 ) (57 ) (1 ) — (1 ) Amortization of prior service cost — — — (23 ) — (23 ) Net periodic (benefit) cost $ (5 ) $ 1 $ (4 ) $ (23 ) $ — $ (23 ) 2016 Service cost $ 17 $ 5 $ 22 $ 2 $ — $ 2 Interest cost 27 8 35 5 — 5 Expected return on plan assets (37 ) (10 ) (47 ) (2 ) — (2 ) Amortization of net actuarial loss — 1 1 — — — Net periodic cost $ 7 $ 4 $ 11 $ 5 $ — $ 5

Segment information (Tables)

Segment information (Tables)	3 Months Ended
	Mar. 31, 2017
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 March 31, 2017 (in millions of U.S. dollars) Net premiums written $ 2,742 $ 984 $ 61 $ 2,200 $ 199 $ 524 $ — $ 6,710 Net premiums earned 3,041 1,086 14 1,936 189 506 — 6,772 Losses and loss expenses 1,860 633 (73 ) 1,071 94 193 11 3,789 Policy benefits — — — — — 168 — 168 Policy acquisition costs 487 217 (1 ) 529 51 114 — 1,397 Administrative expenses 231 65 (5 ) 245 10 72 58 676 Underwriting income (loss) 463 171 93 91 34 (41 ) (69 ) 742 Net investment income (loss) 478 55 6 148 62 75 (79 ) 745 Other (income) expense 4 1 — (1 ) — (29 ) (45 ) (70 ) Amortization expense of purchased intangibles — 3 7 11 — 1 42 64 Segment income (loss) $ 937 $ 222 $ 92 $ 229 $ 96 $ 62 $ (145 ) $ 1,493 Net realized gains (losses) including OTTI (7 ) (7 ) Interest expense 154 154 Chubb integration expenses 111 111 Income tax expense 128 128 Net income (loss) $ (545 ) $ 1,093 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 March 31, 2016 (in millions of U.S. dollars) Net premiums written $ 2,302 $ 871 $ 64 $ 2,041 $ 201 $ 516 $ — $ 5,995 Net premiums earned 2,896 1,024 23 1,955 202 497 — 6,597 Losses and loss expenses 1,747 661 (30 ) 1,021 89 177 9 3,674 Policy benefits — — — — — 126 — 126 Policy acquisition costs 482 249 4 503 53 122 — 1,413 Administrative expenses 266 88 (4 ) 263 14 72 73 772 Underwriting income (loss) 401 26 53 168 46 — (82 ) 612 Net investment income (loss) 426 47 5 146 67 67 (84 ) 674 Other (income) expense — 1 — (5 ) (1 ) 6 27 28 Amortization expense (benefit) of purchased intangibles — 8 7 11 — 1 (20 ) 7 Segment income (loss) $ 827 $ 64 $ 51 $ 308 $ 114 $ 60 $ (173 ) $ 1,251 Net realized gains (losses) including OTTI (394 ) (394 ) Interest expense 146 146 Chubb integration expenses 148 148 Income tax expense 124 124 Net income (loss) $ (985 ) $ 439

Earnings per share (Tables)

Earnings per share (Tables)	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Schedule Of Earnings Per Share, Basic And Diluted	Three Months Ended March 31 (in millions of U.S. dollars, except share and per share data) 2017 2016 Numerator: Net income $ 1,093 $ 439 Denominator: Denominator for basic earnings per share: Weighted-average shares outstanding 468,903,086 446,739,586 Denominator for diluted earnings per share: Share-based compensation plans 3,828,604 3,270,156 Weighted-average shares outstanding and assumed conversions 472,731,690 450,009,742 Basic earnings per share $ 2.33 $ 0.98 Diluted earnings per share $ 2.31 $ 0.97 Potential anti-dilutive share conversions 969,654 2,074,308

Information provided in conne32

Information provided in connection with outstanding debt of subsidiaries (Tables)	3 Months Ended
	Mar. 31, 2017
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract]
Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet at March 31, 2017 (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 $ 304 $ 99,162 $ — $ 99,491 Cash (1) 6 1 2,328 (1,272 ) 1,063 Insurance and reinsurance balances receivable — — 10,956 (2,076 ) 8,880 Reinsurance recoverable on losses and loss expenses — — 24,015 (10,246 ) 13,769 Reinsurance recoverable on policy benefits — — 1,145 (958 ) 187 Value of business acquired — — 345 — 345 Goodwill and other intangible assets — — 22,061 — 22,061 Investments in subsidiaries 39,156 50,242 — (89,398 ) — Due from subsidiaries and affiliates, net 10,396 — — (10,396 ) — Other assets 4 519 18,642 (3,994 ) 15,171 Total assets $ 49,587 $ 51,066 $ 178,654 $ (118,340 ) $ 160,967 Liabilities Unpaid losses and loss expenses $ — $ — $ 70,269 $ (9,690 ) $ 60,579 Unearned premiums — — 18,343 (3,486 ) 14,857 Future policy benefits — — 6,044 (958 ) 5,086 Due to subsidiaries and affiliates, net — 10,028 368 (10,396 ) — Affiliated notional cash pooling programs (1) — 1,272 — (1,272 ) — Repurchase agreements — — 1,404 — 1,404 Short-term debt — 300 — — 300 Long-term debt — 12,289 11 — 12,300 Trust preferred securities — 308 — — 308 Other liabilities 363 1,699 17,987 (3,140 ) 16,909 Total liabilities 363 25,896 114,426 (28,942 ) 111,743 Total shareholders’ equity 49,224 25,170 64,228 (89,398 ) 49,224 Total liabilities and shareholders’ equity $ 49,587 $ 51,066 $ 178,654 $ (118,340 ) $ 160,967 (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 March 31, 2017 , the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Balance Sheet at December 31, 2016 (in millions of U.S. dollars) Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated Assets Investments $ 27 $ 485 $ 98,582 $ — $ 99,094 Cash (1) 1 1 1,965 (982 ) 985 Insurance and reinsurance balances receivable — — 10,498 (1,528 ) 8,970 Reinsurance recoverable on losses and loss expenses — — 24,496 (10,919 ) 13,577 Reinsurance recoverable on policy benefits — — 1,153 (971 ) 182 Value of business acquired — — 355 — 355 Goodwill and other intangible assets — — 22,095 — 22,095 Investments in subsidiaries 38,408 49,509 — (87,917 ) — Due from subsidiaries and affiliates, net 10,482 — — (10,482 ) — Other assets 3 436 18,442 (4,353 ) 14,528 Total assets $ 48,921 $ 50,431 $ 177,586 $ (117,152 ) $ 159,786 Liabilities Unpaid losses and loss expenses $ — $ — $ 70,683 $ (10,143 ) $ 60,540 Unearned premiums — — 18,538 (3,759 ) 14,779 Future policy benefits — — 6,007 (971 ) 5,036 Due to subsidiaries and affiliates, net — 10,209 273 (10,482 ) — Affiliated notional cash pooling programs (1) 363 619 — (982 ) — Repurchase agreements — — 1,403 — 1,403 Short-term debt — 500 — — 500 Long-term debt — 12,599 11 — 12,610 Trust preferred securities — 308 — — 308 Other liabilities 283 1,582 17,368 (2,898 ) 16,335 Total liabilities 646 25,817 114,283 (29,235 ) 111,511 Total shareholders’ equity 48,275 24,614 63,303 (87,917 ) 48,275 Total liabilities and shareholders’ equity $ 48,921 $ 50,431 $ 177,586 $ (117,152 ) $ 159,786 (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, 2016 , the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
Condensed Consolidating Statement Of Operations and Comprehensive Income	Condensed Consolidating Statements of Operations and Comprehensive Income For the Three Months Ended March 31, 2017 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 $ — $ — $ 6,710 $ — $ 6,710 Net premiums earned — — 6,772 — 6,772 Net investment income — 3 742 — 745 Equity in earnings of subsidiaries 1,027 701 — (1,728 ) — Net realized gains (losses) including OTTI — (13 ) 6 — (7 ) Losses and loss expenses — — 3,789 — 3,789 Policy benefits — — 168 — 168 Policy acquisition costs and administrative expenses 18 14 2,041 — 2,073 Interest (income) expense (84 ) 221 17 — 154 Other (income) expense (6 ) 15 (79 ) — (70 ) Amortization of purchased intangibles — — 64 — 64 Chubb integration expenses — 49 62 — 111 Income tax expense (benefit) 6 (112 ) 234 — 128 Net income $ 1,093 $ 504 $ 1,224 $ (1,728 ) $ 1,093 Comprehensive income $ 1,407 $ 791 $ 1,538 $ (2,329 ) $ 1,407 Condensed Consolidating Statements of Operations and Comprehensive Income For the Three Months Ended March 31, 2016 Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 5,995 $ — $ 5,995 Net premiums earned — — 6,597 — 6,597 Net investment income 1 4 669 — 674 Equity in earnings of subsidiaries 375 506 — (881 ) — Net realized gains (losses) including OTTI — — (394 ) — (394 ) Losses and loss expenses — — 3,674 — 3,674 Policy benefits — — 126 — 126 Policy acquisition costs and administrative expenses 17 36 2,132 — 2,185 Interest (income) expense (80 ) 215 11 — 146 Other (income) expense (9 ) 10 27 — 28 Amortization of purchased intangibles — — 7 — 7 Chubb integration expenses 3 137 8 — 148 Income tax expense (benefit) 6 (150 ) 268 — 124 Net income $ 439 $ 262 $ 619 $ (881 ) $ 439 Comprehensive income (loss) $ 1,541 $ 1,056 $ 1,721 $ (2,777 ) $ 1,541
Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows Three Months Ended March 31, 2017 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 (used for) operating activities $ 584 $ (156 ) $ 1,081 $ (496 ) $ 1,013 Cash flows from investing activities Purchases of fixed maturities available for sale — (4 ) (6,246 ) — (6,250 ) Purchases of fixed maturities held to maturity — — (157 ) — (157 ) Purchases of equity securities — — (37 ) — (37 ) Sales of fixed maturities available for sale — — 3,395 — 3,395 Sales of equity securities — — 46 — 46 Maturities and redemptions of fixed maturities available for sale — 7 2,536 — 2,543 Maturities and redemptions of fixed maturities held to maturity — — 240 — 240 Net change in short-term investments — 173 59 — 232 Net derivative instruments settlements — (2 ) (87 ) — (89 ) Other — — 17 — 17 Net cash flows from (used for) investing activities — 174 (234 ) — (60 ) Cash flows from financing activities Dividends paid on Common Shares (324 ) — — — (324 ) Common Shares repurchased — — (128 ) — (128 ) Repayment of long-term debt — (500 ) — — (500 ) Proceeds from issuance of repurchase agreements — — 753 — 753 Repayment of repurchase agreements — — (752 ) — (752 ) Proceeds from share-based compensation plans — — 42 — 42 Dividend to parent company — — (496 ) 496 — Advances (to) from affiliates 108 (171 ) 63 — — Net proceeds from (payments to) affiliated notional cash pooling programs (1) (363 ) 653 — (290 ) — Policyholder contract deposits — — 109 — 109 Policyholder contract withdrawals — — (58 ) — (58 ) Net cash flows used for financing activities (579 ) (18 ) (467 ) 206 (858 ) Effect of foreign currency rate changes on cash and cash equivalents — — (17 ) — (17 ) Net increase in cash 5 — 363 (290 ) 78 Cash – beginning of period (1) 1 1 1,965 (982 ) 985 Cash – end of period (1) $ 6 $ 1 $ 2,328 $ (1,272 ) $ 1,063 (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2017 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Statement of Cash Flows Three Months Ended March 31, 2016 Chubb Limited (Parent Guarantor) Chubb INA Holdings Inc. (Subsidiary Issuer) Other Chubb Limited Subsidiaries Consolidating Adjustments and Eliminations Chubb Limited Consolidated (in millions of U.S. dollars) Net cash flows from operating activities $ 3,272 $ 3,109 $ 1,011 $ (6,372 ) $ 1,020 Cash flows from investing activities Purchases of fixed maturities available for sale — — (8,104 ) — (8,104 ) Purchases of fixed maturities held to maturity — — (77 ) — (77 ) Purchases of equity securities — — (33 ) — (33 ) Sales of fixed maturities available for sale — — 6,329 — 6,329 Sales of equity securities — — 761 — 761 Maturities and redemptions of fixed maturities available for sale — — 1,553 — 1,553 Maturities and redemptions of fixed maturities held to maturity — — 249 — 249 Net change in short-term investments — 7,788 4,144 — 11,932 Net derivative instruments settlements — — (22 ) — (22 ) Acquisition of subsidiaries (net of cash acquired of $57) — (14,282 ) 20 — (14,262 ) Capital contribution (2,330 ) — (2,330 ) 4,660 — Other — — 59 — 59 Net cash flows from (used for) investing activities (2,330 ) (6,494 ) 2,549 4,660 (1,615 ) Cash flows from financing activities Dividends paid on Common Shares (218 ) — — — (218 ) Proceeds from issuance of repurchase agreements — — 853 — 853 Repayment of repurchase agreements — — (853 ) — (853 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 51 — 51 Dividend to parent company — — (6,372 ) 6,372 — Advances (to) from affiliates (362 ) 350 12 — — Capital contribution — 2,330 2,330 (4,660 ) — Net proceeds from (payments to) affiliated notional cash pooling programs (1) (361 ) 710 — (349 ) — Policyholder contract deposits — — 118 — 118 Policyholder contract withdrawals — — (49 ) — (49 ) Other — (4 ) — — (4 ) Net cash flows from (used for) financing activities (941 ) 3,386 (3,910 ) 1,363 (102 ) Effect of foreign currency rate changes on cash and cash equivalents — — 13 — 13 Net increase (decrease) in cash 1 1 (337 ) (349 ) (684 ) Cash – beginning of period (1) 1 2 2,743 (971 ) 1,775 Cash – end of period (1) $ 2 $ 3 $ 2,406 $ (1,320 ) $ 1,091 (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 and December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

General Adoption of New Account

General Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense	$ 128	$ 124
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense	$ 25

General Goodwill (Details)

General Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Period Increase (Decrease)	$ 55

General Schedule of long-term d

General Schedule of long-term debt (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Apr. 15, 2017	Feb. 28, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Short-term debt	$ 300			$ 500
Chubb INA Capital Securities Due 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,000
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2037 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.41%
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2037 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Senior Notes [Member] | INA Senior Notes Due February 2017 [Member]
Debt Instrument [Line Items]
Short-term debt			$ 500
Debt Instrument, Interest Rate, Stated Percentage			5.70%
Senior Notes [Member] | INA Senior Notes Due March 2018 [Member]
Debt Instrument [Line Items]
Short-term debt	$ 300
Debt Instrument, Interest Rate, Stated Percentage	5.80%

Acquisitions Acquisitions (narr

Acquisitions Acquisitions (narrative) (Details) - USD ($) $ in Millions	Jan. 14, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 15,387		$ 15,332
The Chubb Corporation [Member]
Business Acquisition [Line Items]
Purchase price	$ 29,500
Cash consideration paid by Chubb Limited to common shareholders of Chubb Corp	14,300
Equity Issued in Business Combination, Fair Value Disclosure	15,200
Business Combination, Consideration Transferred	29,800
Goodwill	10,500
Additional Paid-in Capital [Member]
Business Acquisition [Line Items]
Attributed Value Equity Awards Assumed in Acquisition		(260)	$ (310)
Additional Paid-in Capital [Member] | The Chubb Corporation [Member]
Business Acquisition [Line Items]
Attributed Value Equity Awards Assumed in Acquisition	$ 323	$ 0	$ 323

Supplemental Financial Informat

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

Investments (Narrative) (Detail

Investments (Narrative) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)Security	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)
Investment [Line Items]
Net unrealized appreciation (depreciation) included in OCI	$ 0	$ 23
Unrealized appreciation (depreciation) portion of AOCI with OTTI included in AOCI	$ 10		$ 10
Percentage of mortgage-backed securities represented by investments in US government agency bonds	82.00%		81.00%
Total number of fixed maturities | Security	31,098
Number of equity securities in an unrealized loss position | Security	70
Total number of equity securities | Security	325
Largest single unrealized loss in the equity securities	$ 1
Restricted assets in fixed maturities and short-term investments	20,600		$ 20,100
Restricted assets in cash	$ 97		$ 103
Moodys Historical Mean Recovery Rate	42.00%
Company Assumed Recovery Rate	32.00%
Number of fixed maturities in an unrealized loss position | Security	9,408
Largest single unrealized loss in the fixed maturities	$ 6
Corporate [Member]
Investment [Line Items]
Credit losses recognized in net income	1	17
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Credit losses recognized in net income	$ 0	$ 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	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	$ 79,957	$ 79,536
Available-for-sale,Gross Unrealized Gain	1,496	1,455
Available-for-sale, Gross Unrealized Depreciation	(647)	(876)
Available for sale, Fair Value	80,806	80,115
Available for sale, OTTI recognized in AOCI	(12)	(14)
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	2,900	2,883
Available-for-sale,Gross Unrealized Gain	34	32
Available-for-sale, Gross Unrealized Depreciation	(35)	(45)
Available for sale, Fair Value	2,899	2,870
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	20,795	20,929
Available-for-sale,Gross Unrealized Gain	651	636
Available-for-sale, Gross Unrealized Depreciation	(79)	(125)
Available for sale, Fair Value	21,367	21,440
Available for sale, OTTI recognized in AOCI	(3)	(5)
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	24,372	23,736
Available-for-sale,Gross Unrealized Gain	603	580
Available-for-sale, Gross Unrealized Depreciation	(133)	(167)
Available for sale, Fair Value	24,842	24,149
Available for sale, OTTI recognized in AOCI	(8)	(8)
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	14,217	14,066
Available-for-sale,Gross Unrealized Gain	127	135
Available-for-sale, Gross Unrealized Depreciation	(198)	(194)
Available for sale, Fair Value	14,146	14,007
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	17,673	17,922
Available-for-sale,Gross Unrealized Gain	81	72
Available-for-sale, Gross Unrealized Depreciation	(202)	(345)
Available for sale, Fair Value	17,552	17,649
Available for sale, OTTI recognized in AOCI	$ 0	$ 0

Investments (Schedule Of Amorti

Investments (Schedule Of Amortized Cost And Fair Value Of HTM Fixed Maturities And Related OTTI Recognized In Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Held to maturity, Amortized Cost	$ 10,519	$ 10,644
Held to maturity, Gross Unrealized Appreciation	159	148
Held to maturity, Gross Unrealized Depreciation	(74)	(122)
Held to maturity, at Fair Value	10,604	10,670
U.S. Treasury And Agency [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	601	655
Held to maturity, Gross Unrealized Appreciation	10	9
Held to maturity, Gross Unrealized Depreciation	(3)	(3)
Held to maturity, at Fair Value	608	661
Held to maturity, OTTI recognized in AOCI	0	0
Foreign [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	625	640
Held to maturity, Gross Unrealized Appreciation	27	28
Held to maturity, Gross Unrealized Depreciation	(1)	(1)
Held to maturity, at Fair Value	651	667
Held to maturity, OTTI recognized in AOCI	0	0
Corporate [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	2,710	2,771
Held to maturity, Gross Unrealized Appreciation	50	50
Held to maturity, Gross Unrealized Depreciation	(20)	(26)
Held to maturity, at Fair Value	2,740	2,795
Held to maturity, OTTI recognized in AOCI	0	0
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	1,319	1,393
Held to maturity, Gross Unrealized Appreciation	35	35
Held to maturity, Gross Unrealized Depreciation	0	0
Held to maturity, at Fair Value	1,354	1,428
Held to maturity, OTTI recognized in AOCI	0	0
States, Municipalities, And Political Subdivisions [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	5,264	5,185
Held to maturity, Gross Unrealized Appreciation	37	26
Held to maturity, Gross Unrealized Depreciation	(50)	(92)
Held to maturity, at Fair Value	5,251	5,119
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	Mar. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 3,828	$ 3,892
Available for sale, Due after 1 year through 5 years, Amortized Cost	23,950	24,027
Available for sale, Due after 5 years though 10 years, Amortized Cost	27,693	27,262
Available for sale, Due after 10 years, Amortized Cost	10,269	10,289
Available for sale, Subtotal, Amortized Cost	65,740	65,470
Available for sale, Mortgage-backed securities, Amortized Cost	14,217	14,066
Available for sale, at amortized cost	79,957	79,536
Available for sale, Due in 1 year or less, Fair Value	3,851	3,913
Available for sale, Due after 1 year through 5 years, Fair Value	24,413	24,429
Available for sale, Due after 5 years through 10 years, Fair Value	27,955	27,379
Available for sale, Due after 10 years, Fair Value	10,441	10,387
Available for sale, Subtotal, Fair Value	66,660	66,108
Available for sale, Mortgage backed securities, Fair Value	14,146	14,007
Available for sale, Fair Value	80,806	80,115
Held to maturity, Due in 1 year or less, Amortized Cost	481	430
Held to maturity, Due after 1 year through 5 years, Amortized Cost	2,648	2,646
Held to maturity, Due after 5 years through 10 years, Amortized Cost	2,973	2,969
Held to maturity, Due after 10 years, Amortized Cost	3,098	3,206
Held to maturity, Subtotal, Amortized Cost	9,200	9,251
Held to maturity, Mortgage backed securities, Amortized Cost	1,319	1,393
Held to maturity, Amortized Cost	10,519	10,644
Held to maturity, Due in 1 year or less, Fair Value	486	435
Held to maturity, Due after 1 year through 5, Fair Value	2,695	2,691
Held to maturity, Due after 5 years through 10 years, Fair Value	2,980	2,944
Held to maturity, Due after 10 years, Fair Value	3,089	3,172
Held to maturity, Subtotal, Fair Value	9,250	9,242
Held to maturity, Mortgage backed securities, Fair Value	1,354	1,428
Held to maturity, Fair Value	$ 10,604	$ 10,670

Investments (Schedule Of Cost A

Investments (Schedule Of Cost And Fair Value Of Equity Securities) (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Cost	$ 699	$ 706
Gross unrealized appreciation	144	129
Gross unrealized depreciation	(8)	(21)
Equity securities, at fair value	$ 835	$ 814

Investments (Net Realized Gains

Investments (Net Realized Gains (Losses) And Losses Included In Net Realized Gains (Losses) And Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment (OTTI) losses gross	$ (19)	$ (71)
OTTI on fixed maturities recognized in OCI (pre-tax)	0	8
Foreign exchange gains (losses)	(19)	39
Derivative instrument	27	(284)
Fair Value Adjustments On Insurance Derivative Gains Losses	93	(228)
Net realized gains (losses)	(7)	(394)
Investment and embedded derivative instruments
Gain (Loss) on Investments [Line Items]
Derivative instrument	6	(39)
S&P put options and futures
Gain (Loss) on Investments [Line Items]
Derivative instrument	(74)	(15)
Other derivative instruments
Gain (Loss) on Investments [Line Items]
Derivative instrument	2	(2)
Other Investments [Member]
Gain (Loss) on Investments [Line Items]
OTTI on equity securities	(8)	(3)
Other	1	6
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
OTTI on equity securities	(5)	(1)
Equity Securities, Gross realized gains excluding OTTI	9	40
Equity Securities, Gross realized losses excluding OTTI	0	(1)
Total equity securities	4	38
Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment (OTTI) losses gross	(6)	(67)
OTTI on fixed maturities recognized in OCI (pre-tax)	0	8
OTTI on fixed maturities, net	(6)	(59)
Fixed maturities, Gross realized gains excluding OTTI	34	65
Fixed maturities, Gross realized losses excluding OTTI	(40)	(196)
Total fixed maturities	$ (12)	$ (190)

Investments (Roll-Forward Of Pr

Investments (Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which Portion Of Other-Than-Temporary Impairment Was Recognized In Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
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	$ 35	$ 53
Additions where no OTTI was previously recorded	0	11
Additions where an OTTI was previously recorded	1	6
Reductions for securities sold during the period	(4)	(13)
Balance of credit losses related to securities still held – end of period	$ 32	$ 57

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	Mar. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Fair Value, 0-12 Months	$ 38,278	$ 43,641
Gross Unrealized Loss, 0-12 Months	(678)	(959)
Fair Value, Over 12 Months	1,429	1,310
Gross Unrealized Loss, Over 12 Months	(60)	(78)
Total Fair Value	39,707	44,951
Total Gross Unrealized Loss	(738)	(1,037)
U.S. Treasury And Agency [Member]
Investment [Line Items]
Fair Value, 0-12 Months	2,011	2,216
Gross Unrealized Loss, 0-12 Months	(38)	(48)
Fair Value, Over 12 Months	0	0
Gross Unrealized Loss, Over 12 Months	0	0
Total Fair Value	2,011	2,216
Total Gross Unrealized Loss	(38)	(48)
Foreign [Member]
Investment [Line Items]
Fair Value, 0-12 Months	4,428	5,918
Gross Unrealized Loss, 0-12 Months	(59)	(99)
Fair Value, Over 12 Months	684	386
Gross Unrealized Loss, Over 12 Months	(21)	(27)
Total Fair Value	5,112	6,304
Total Gross Unrealized Loss	(80)	(126)
Corporate [Member]
Investment [Line Items]
Fair Value, 0-12 Months	6,139	7,021
Gross Unrealized Loss, 0-12 Months	(121)	(149)
Fair Value, Over 12 Months	491	641
Gross Unrealized Loss, Over 12 Months	(32)	(44)
Total Fair Value	6,630	7,662
Total Gross Unrealized Loss	(153)	(193)
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Fair Value, 0-12 Months	8,735	8,638
Gross Unrealized Loss, 0-12 Months	(195)	(189)
Fair Value, Over 12 Months	131	234
Gross Unrealized Loss, Over 12 Months	(3)	(5)
Total Fair Value	8,866	8,872
Total Gross Unrealized Loss	(198)	(194)
States, Municipalities, And Political Subdivisions [Member]
Investment [Line Items]
Fair Value, 0-12 Months	16,731	19,448
Gross Unrealized Loss, 0-12 Months	(248)	(435)
Fair Value, Over 12 Months	123	49
Gross Unrealized Loss, Over 12 Months	(4)	(2)
Total Fair Value	16,854	19,497
Total Gross Unrealized Loss	(252)	(437)
Fixed Maturities [Member]
Investment [Line Items]
Fair Value, 0-12 Months	38,044	43,241
Gross Unrealized Loss, 0-12 Months	(661)	(920)
Fair Value, Over 12 Months	1,429	1,310
Gross Unrealized Loss, Over 12 Months	(60)	(78)
Total Fair Value	39,473	44,551
Total Gross Unrealized Loss	(721)	(998)
Equity Securities [Member]
Investment [Line Items]
Fair Value, 0-12 Months	150	199
Gross Unrealized Loss, 0-12 Months	(8)	(21)
Fair Value, Over 12 Months	0	0
Gross Unrealized Loss, Over 12 Months	0	0
Total Fair Value	150	199
Total Gross Unrealized Loss	(8)	(21)
Other Long-term Investments [Member]
Investment [Line Items]
Fair Value, 0-12 Months	84	201
Gross Unrealized Loss, 0-12 Months	(9)	(18)
Fair Value, Over 12 Months	0	0
Gross Unrealized Loss, Over 12 Months	0	0
Total Fair Value	84	201
Total Gross Unrealized Loss	$ (9)	$ (18)

Investments (Schedule Of Compon

Investments (Schedule Of Components Of Restricted Assets) (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Trust funds	$ 14,359	$ 13,880
Deposits with U.S. regulatory authorities	2,356	2,203
Deposits with non-U.S. regulatory authorities	2,192	2,191
Assets pledged under repurchase agreements	1,453	1,461
Other pledged assets	366	435
Total restricted assets	$ 20,726	$ 20,170

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016		Dec. 31, 2016		Dec. 31, 2015	[2]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	$ 80,806				$ 80,115
Equity securities, at fair value	835				814
Other Investments	4,551				4,519
Securities lending collateral	1,071				1,092
Fair Value, Level 1 to Level 2 transfers, Amount	0		$ 0
Fair Value, Level 2 to Level 1 Transfers, Amount	0		0
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Other Investments	3,594				3,626
Other Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Other Investments	20				25
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	80,806				80,115
Equity securities, at fair value	835				814
Short-term investments	2,780				3,002
Other Investments	937				868
Securities lending collateral	1,071				1,092
Investment derivative instruments, assets	15				31
Other Derivative Instruments Fair Value	8				3
Separate Account Assets	2,067				1,879
Total assets measured at fair value	88,519				87,804
Investment derivative instruments, liabilities	30				54
Other derivative instruments, liability	11				13
Liabilities, Fair Value Disclosure, Recurring	507				626
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	862				800
Equity securities, at fair value	41				41
Short-term investments	21				25
Other Investments	232				225
Total assets measured at fair value	1,156				1,091
Other derivative instruments, liability	11				13
Liabilities, Fair Value Disclosure, Recurring	477				572
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	2,222				2,175
Equity securities, at fair value	794				773
Short-term investments	1,548				1,757
Other Investments	425				384
Investment derivative instruments, assets	15				31
Other Derivative Instruments Fair Value	8				3
Separate Account Assets	1,970				1,784
Total assets measured at fair value	6,982				6,907
Investment derivative instruments, liabilities	30				54
Liabilities, Fair Value Disclosure, Recurring	30				54
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	77,722				77,140
Short-term investments	1,211				1,220
Other Investments	280				259
Securities lending collateral	1,071				1,092
Separate Account Assets	97				95
Total assets measured at fair value	80,381				79,806
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	2,899				2,870
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	2,222				2,175
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	677				695
Fair Value, Measurements, Recurring [Member] | Foreign [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	21,367				21,440
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	80				74
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	21,287				21,366
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	24,842				24,149
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	737				681
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	24,105				23,468
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	14,146				14,007
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	45				45
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	14,101				13,962
Fair Value, Measurements, Recurring [Member] | States, Municipalities, And Political Subdivisions [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value	17,552				17,649
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	17,552				17,649
Guaranteed Minimum Income Benefit [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	466	[1]	$ 839	[1],[2]	559	[1]	$ 609
Guaranteed Minimum Income Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value					559
Guaranteed Minimum Income Benefit [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	466	[3]			559
Guaranteed Minimum Income Benefit [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	$ 466	[4]			$ 559
[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 $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 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. The liability for GLB reinsurance was $1.1 billion at March 31, 2016, and $888 million at December 31, 2015, which includes a fair value derivative adjustment of $839 million and $609 million, respectively.(2) Includes acquired invested assets as a result of the Chubb Corp acquisition.
[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.
[4]	Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 4 a) Guaranteed living benefits.

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value And Maximum Future Funding Commitments Related To Investments) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 1,895	$ 2,040
Fair Value	$ 3,594	3,627
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	$ 398	428
Fair Value	$ 548	$ 548
Financial [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	5 years	5 years
Financial [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	9 years	9 years
Real Assets [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 186	$ 230
Fair Value	$ 612	$ 536
Real Assets [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	3 years	3 years
Real Assets [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	7 years	7 years
Distressed [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 179	$ 179
Fair Value	$ 350	$ 485
Distressed [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	5 years	5 years
Distressed [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	9 years	9 years
Private Credit [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 248	$ 259
Fair Value	$ 244	$ 236
Private Credit [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	3 years	3 years
Private Credit [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	7 years	7 years
Traditional [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 870	$ 930
Fair Value	$ 1,563	$ 1,550
Traditional [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	3 years	3 years
Traditional [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	9 years	9 years
Vintage [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 14	$ 14
Fair Value	$ 18	$ 21
Vintage [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	1 year	1 year
Vintage [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	2 years	2 years
Investment Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 259	$ 251

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017		Dec. 31, 2016		Mar. 31, 2016	[2],[3]	Dec. 31, 2015	[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]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate	[1]	3.00%
Significant Unobservable Inputs Annuitization Rate	[1]	0.00%
Maximum [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate	[1]	34.00%
Significant Unobservable Inputs Annuitization Rate	[1]	78.00%
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		$ 466	[2]	$ 559	[2]	$ 839		$ 609
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				$ 559
[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 $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 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. The liability for GLB reinsurance was $1.1 billion at March 31, 2016, and $888 million at December 31, 2015, which includes a fair value derivative adjustment of $839 million and $609 million, respectively.(2) Includes acquired invested assets as a result of the Chubb Corp acquisition.

Fair Value Measurements (Assets

Fair Value Measurements (Assets Measured At Fair Value Using Significant Unobservable Inputs) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 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	$ 74	$ 57
Transfers Into Level 3, Asset	0	6
Transfers out of Level 3, Assets	0	(2)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(1)	6
Net Realized Gains/Losses, Assets	(1)	(5)
Purchases, Assets	14	5
Sales, Assets	(3)	(1)
Settlements, Assets	(3)	(4)
Balance-End of Period, Assets	80	62
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	(4)
Corporate [Member] | Available-for-sale Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	681	174
Transfers Into Level 3, Asset	29	16
Transfers out of Level 3, Assets	(54)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(8)	2
Net Realized Gains/Losses, Assets	(1)	(6)
Purchases, Assets	156	93
Sales, Assets	(27)	(14)
Settlements, Assets	(39)	(4)
Balance-End of Period, Assets	737	261
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	(7)
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	45	53
Transfers Into Level 3, Asset	0	0
Transfers out of Level 3, Assets	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Net Realized Gains/Losses, Assets	0	0
Purchases, Assets	1	0
Sales, Assets	(1)	(5)
Settlements, Assets	0	0
Balance-End of Period, Assets	45	48
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	41	16
Transfers Into Level 3, Asset	0	0
Transfers out of Level 3, Assets	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Net Realized Gains/Losses, Assets	0	0
Purchases, Assets	0	13
Sales, Assets	0	0
Settlements, Assets	0	0
Balance-End of Period, Assets	41	29
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Short-term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	25
Transfers Into Level 3, Asset	0
Transfers out of Level 3, Assets	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0
Net Realized Gains/Losses, Assets	0
Purchases, Assets	7
Sales, Assets	0
Settlements, Assets	(11)
Balance-End of Period, Assets	21
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0
Other Long-term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	225	212
Transfers Into Level 3, Asset	0	0
Transfers out of Level 3, Assets	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	4	0
Net Realized Gains/Losses, Assets	0	0
Purchases, Assets	8	6
Sales, Assets	0	0
Settlements, Assets	(4)	(7)
Balance-End of Period, Assets	233	211
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ 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
		Mar. 31, 2017		Mar. 31, 2016		Dec. 31, 2015
Guaranteed Minimum Income Benefit [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Reported liabilities				$ 1,100		$ 888
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance - Beginning of Period, Liabilities		$ 559	[1]	609	[2]
Transfers into level 3, liability		0		0
Transfers out of Level 3, Liabilities		0		0
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities		0		0
Net Realized Gains/Losses, Liabilities		(93)		230	[2]
Purchases, Liabilities		0		0
Sales, Liabilities		0		0
Settlements, Liabilities		0		0
Balance - End of Period, Liabilities	[1]	466		839	[2]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(93)		230
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		559
Other Derivative Instruments Fair Value [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance - Beginning of Period, Liabilities		13		6
Transfers into level 3, liability		0		0
Transfers out of Level 3, Liabilities		0
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities		0		0
Net Realized Gains/Losses, Liabilities		(2)		2
Purchases, Liabilities		0		2
Sales, Liabilities		0		0
Settlements, Liabilities		0		0
Balance - End of Period, Liabilities		11		10
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)		$ (2)		$ 2
[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 $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 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. The liability for GLB reinsurance was $1.1 billion at March 31, 2016, and $888 million at December 31, 2015, which includes a fair value derivative adjustment of $839 million and $609 million, respectively.(2) Includes acquired invested assets as a result of the Chubb Corp acquisition.

Fair Value Measurements (Carryi

Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	$ 10,604	$ 10,670
Held-to-maturity Securities	10,519	10,644
Repurchase agreements	1,404	1,403
Long-term debt	12,300	12,610
Short-term debt	300	500
Trust preferred securities	308	308
Total liabilities	111,743	111,511
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	518	555
Repurchase agreements	0	0
Long-term Debt, Fair Value	0	0
Short-term Debt, Fair Value	0	0
Trust preferred securities	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	10,074	10,102
Repurchase agreements	1,404	1,403
Long-term Debt, Fair Value	12,757	12,998
Short-term Debt, Fair Value	312	503
Trust preferred securities	458	456
Total liabilities	14,931	15,360
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	12	13
Repurchase agreements	0	0
Long-term Debt, Fair Value	0	0
Short-term Debt, Fair Value	0	0
Trust preferred securities	0	0
Total liabilities	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	518	555
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	90	106
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	651	667
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	2,728	2,782
Corporate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	12	13
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	1,354	1,428
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	5,251	5,119
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	10,604	10,670
Repurchase agreements	1,404	1,403
Long-term Debt, Fair Value	12,757	12,998
Short-term Debt, Fair Value	312	503
Trust preferred securities	458	456
Total liabilities	14,931	15,360
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	608	661
Estimate of Fair Value Measurement [Member] | Foreign [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	651	667
Estimate of Fair Value Measurement [Member] | Corporate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	2,740	2,795
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	1,354	1,428
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	5,251	5,119
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	10,519	10,644
Repurchase agreements	1,404	1,403
Long-term debt	12,300	12,610
Short-term debt	300	500
Trust preferred securities	308	308
Total liabilities	14,312	14,821
Reported Value Measurement [Member] | U.S. Treasury And Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	601	655
Reported Value Measurement [Member] | Foreign [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	625	640
Reported Value Measurement [Member] | Corporate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	2,710	2,771
Reported Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	1,319	1,393
Reported Value Measurement [Member] | States, Municipalities, And Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	$ 5,264	$ 5,185

Unpaid losses and loss expens53

Unpaid losses and loss expenses Unpaid losses and loss expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Jan. 14, 2016
Liability for Claims and Claims Adjustment Expense [Abstract]
Gross unpaid losses and loss expenses, beginning of year	$ 60,540	$ 37,303
Reinsurance Recoverable on unpaid losses, beginning of year	(12,708)	(10,741)
Net unpaid loss, beginning of period	47,832	26,562
Acquisition of subsidiaries			$ 0	$ 21,363
Total, Beginning of year	47,832	47,925
Current Year Claims and Claims Adjustment Expense	4,078	3,965
Prior Year Claims and Claims Adjustment Expense	(289)	(291)
Total, Incurred	3,789	3,674
Net loss and loss expenses paid, Current Year	798	586
Net losses and loss expenses Paid, Prior Years	3,109	2,963
Total, Paid	3,907	3,549
Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other	54	29
Net unpaid Loss, end of period	47,768	48,079
Reinsurance Recoverables on unpaid losses, end of year	12,811	12,127
Gross unpaid losses and loss expenses, end of year	$ 60,579	$ 60,206

Commitments, Contingencies, A54

Commitments, Contingencies, And Guarantees (Narrative) (Detail) - USD ($) $ in Millions	1 Months Ended
	May 04, 2017	Mar. 31, 2017	Dec. 31, 2016
Financial Instruments Owned and Pledged as Collateral [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed		$ 603
Securities lending collateral		1,071	$ 1,092
Securities lending payable		1,072	1,093
Derivative liability subject to a master netting agreement		1	10
Unrecognized tax benefits		18
Repurchase agreements		1,404	$ 1,403
Funding commitments relating to limited partnerships and partially-owned investment companies		1,900
Carrying value of limited partnerships and partially-owned investment companies included in other investments		$ 3,300
Subsequent Event [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	$ 853
Long-term Purchase Commitment, Amount	$ 250

Commitments, Contingencies, A55

Commitments, Contingencies, And Guarantees (Balance Sheet Locations, Fair Values In Asset Or (Liability) Position, And Notional Values/Payment Provisions Of Derivative Instruments) (Detail) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		$ 2,303	$ 2,220
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 notes and bonds
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		834	2,344
Convertibles and Bonds with Warrants Attached [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		7	7	[1]
Investment And Embedded Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		17	33
Notional Value/Payment Provision		3,239	4,666
Single-Stock Future [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[2]	1,391	1,316
Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		254	214
Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		1,645	1,530
Guaranteed Living Benefits [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[3]	1,186	1,264
Other Assets [Member] | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Fair Value, Asset		12	25
Other Assets [Member] | Options/Futures contracts on notes and bonds
Derivatives, Fair Value [Line Items]
Fair Value, Asset		3	6
Other Assets [Member] | Single-Stock Future [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset	[2]	4	1
Other Assets [Member] | Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		4	2
Other Assets [Member] | Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		8	3
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		(26)	(50)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Options/Futures contracts on notes and bonds
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(4)	(4)
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		(30)	(54)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Single-Stock Future [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability	[2]	0	0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(11)	(13)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(11)	(13)
Fixed Maturities Available For Sale [Member] | Convertibles and Bonds with Warrants Attached [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		2	2	[1]
Accounts Payable Future Policy Benefits [Member] | Guaranteed Living Benefits [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability	[3]	$ (774)	$ (853)
[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. 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, a56

Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Transactions accounted for as secured borrowings) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	$ 1,071	$ 1,092
Securities lending payable	1,072	1,093
Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Secured Borrowings, Gross, Difference, Amount	(1)	(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	570	423
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	22	54
Foreign Government Debt [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	233	578
Corporate [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	0	37
Collateralized Mortgage Backed Securities [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	33	0
Equity Securities [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	$ 213	$ 0

Commitments, contingencies, a57

Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	$ 1,453	$ 1,461
Repurchase agreements	1,404	1,403
Cash and Cash Equivalents [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	0	1
U.S. Treasury And Agency [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	245	240
Collateralized Mortgage Backed Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	1,208	1,220
Repurchase Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Secured Borrowings, Gross, Difference, Amount	49	58
Maturity Less than 30 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	369	569
Maturity Less than 30 Days [Member] | Cash and Cash Equivalents [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	0	0
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	9	230
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	360	339
Maturity Greater than 90 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	1,084	892
Maturity Greater than 90 Days [Member] | Cash and Cash Equivalents [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements	0	1
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	236	10
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	$ 848	$ 881

Commitments, Contingencies, A58

Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	$ 27	$ (284)
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	14	(10)
All Other Futures Contracts And Options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	(8)	(34)
Convertibles and Bonds with Warrants Attached [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	0	5
Investment And Embedded Derivative Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	6	(39)
Guaranteed Minimum Income Benefit [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	93	(228)
Single-Stock Future [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	(74)	(15)
Other Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	2	(2)
Guaranteed Living Benefit And Other Derivative Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	$ 21	$ (245)

Shareholders' equity Sharehol59

Shareholders' equity Shareholders' equity (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017$ / sharesSFr / sharesshares	Mar. 31, 2017SFr / sharesshares	Mar. 31, 2016$ / shares	Mar. 31, 2016SFr / shares	Dec. 31, 2016SFr / sharesshares	Nov. 30, 2016USD ($)	May 31, 2016$ / shares	May 31, 2015$ / shares
Equity, Class of Treasury Stock [Line Items]
Common Shares, par value | SFr / shares	SFr 24.15	SFr 24.15			SFr 24.15
Common Stock, Dividend Rate Declared | (per share)	SFr 0.69	SFr 0.69	$ 0.67	SFr 0.66
Common Shares in treasury, shares | shares	12,560,845	12,560,845			13,815,148
Annual dividend per share approved by shareholders							$ 2.76	$ 2.68
Common Stock, Dividend Rate Approved							$ 0.69	$ 0.67
Nov 2016 Stock Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount of share repurchase program | $						$ 1,000

Shareholders' equity Share Repu

Shareholders' equity Share Repurchases (Details) - Nov 2016 Stock Repurchase Plan [Member] - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	May 04, 2017	Mar. 31, 2017
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired		1,036,064
Treasury Stock, Value, Acquired, Cost Method		$ 140
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 860
Subsequent Event [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	664,301
Treasury Stock, Value, Acquired, Cost Method	$ 91
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 769

Share-Based Compensation (Detai

Share-Based Compensation (Detail) - $ / shares	Feb. 23, 2017	Mar. 31, 2017
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	2,065,620
Weighted-average grant date fair value for stock options granted	$ 22.97
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	1,105,118
Grant date fair value of awards except for options granted to employees and officers of the company	$ 139.01
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	326,272
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	202,251

Postretirement benefits Compone

Postretirement benefits Components of net periodic benefit costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 20	$ 22
Interest Cost	33	35
Expected Return on Plan Assets	(57)	(47)
Amortization of Actuarial (Gain) Loss		1
Amortization of Prior Service Cost	0
Net Periodic Benefit Cost	(4)	11
Pension Plan [Member] | UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	16	17
Interest Cost	26	27
Expected Return on Plan Assets	(47)	(37)
Amortization of Actuarial (Gain) Loss		0
Amortization of Prior Service Cost	0
Net Periodic Benefit Cost	(5)	7
Pension Plan [Member] | Non-US [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	4	5
Interest Cost	7	8
Expected Return on Plan Assets	(10)	(10)
Amortization of Actuarial (Gain) Loss		1
Amortization of Prior Service Cost	0
Net Periodic Benefit Cost	1	4
Other Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0	2
Interest Cost	1	5
Expected Return on Plan Assets	(1)	(2)
Amortization of Actuarial (Gain) Loss		0
Amortization of Prior Service Cost	(23)
Net Periodic Benefit Cost	(23)	5
Other Postretirement Benefit Plan [Member] | UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0	2
Interest Cost	1	5
Expected Return on Plan Assets	(1)	(2)
Amortization of Actuarial (Gain) Loss		0
Amortization of Prior Service Cost	(23)
Net Periodic Benefit Cost	(23)	5
Other Postretirement Benefit Plan [Member] | Non-US [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0	0
Interest Cost	0	0
Expected Return on Plan Assets	0	0
Amortization of Actuarial (Gain) Loss		0
Amortization of Prior Service Cost	0
Net Periodic Benefit Cost	$ 0	$ 0

Segment information Segment Inf

Segment information Segment Information (narrative Detail (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net investment income	$ 745	$ 674
Segment Life [Member]
Segment Reporting Information [Line Items]
Net investment income	75	$ 67
Management Underwriting Income (Loss)	64
Gains Losses On Fair Value Changes In Separate Account Assets	$ 30

Segment Information (Operations

Segment Information (Operations By Segment) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net premiums written	$ 6,710	$ 5,995
Net premiums earned	6,772	6,597
Losses and loss expenses	3,789	3,674
Policy benefits	168	126
Policy acquisition costs	1,397	1,413
Administrative expenses	676	772
Underwriting income (loss)	742	612
Net investment income	745	674
Other (income) expense	(70)	28
Amortization of purchased intangibles	64	7
Segment Income (loss)	1,493	1,251
Net realized gains (losses) including OTTI	(7)	(394)
Interest expense	154	146
Chubb integration expenses	111	148
Income tax expense	128	124
Net income	1,093	439
North America Commercial P&C Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	2,742	2,302
Net premiums earned	3,041	2,896
Losses and loss expenses	1,860	1,747
Policy benefits	0	0
Policy acquisition costs	487	482
Administrative expenses	231	266
Underwriting income (loss)	463	401
Net investment income	478	426
Other (income) expense	4	0
Amortization of purchased intangibles	0	0
Segment Income (loss)	937	827
North America Personal P&C Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	984	871
Net premiums earned	1,086	1,024
Losses and loss expenses	633	661
Policy benefits	0	0
Policy acquisition costs	217	249
Administrative expenses	65	88
Underwriting income (loss)	171	26
Net investment income	55	47
Other (income) expense	1	1
Amortization of purchased intangibles	3	8
Segment Income (loss)	222	64
North America Agricultural Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	61	64
Net premiums earned	14	23
Losses and loss expenses	(73)	(30)
Policy benefits	0	0
Policy acquisition costs	(1)	4
Administrative expenses	(5)	(4)
Underwriting income (loss)	93	53
Net investment income	6	5
Other (income) expense	0	0
Amortization of purchased intangibles	7	7
Segment Income (loss)	92	51
Overseas General Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	2,200	2,041
Net premiums earned	1,936	1,955
Losses and loss expenses	1,071	1,021
Policy benefits	0	0
Policy acquisition costs	529	503
Administrative expenses	245	263
Underwriting income (loss)	91	168
Net investment income	148	146
Other (income) expense	(1)	(5)
Amortization of purchased intangibles	11	11
Segment Income (loss)	229	308
Global Reinsurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	199	201
Net premiums earned	189	202
Losses and loss expenses	94	89
Policy benefits	0	0
Policy acquisition costs	51	53
Administrative expenses	10	14
Underwriting income (loss)	34	46
Net investment income	62	67
Other (income) expense	0	(1)
Amortization of purchased intangibles	0	0
Segment Income (loss)	96	114
Life Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	524	516
Net premiums earned	506	497
Losses and loss expenses	193	177
Policy benefits	168	126
Policy acquisition costs	114	122
Administrative expenses	72	72
Underwriting income (loss)	(41)	0
Net investment income	75	67
Other (income) expense	(29)	6
Amortization of purchased intangibles	1	1
Segment Income (loss)	62	60
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Net premiums written	0	0
Net premiums earned	0	0
Losses and loss expenses	11	9
Policy benefits	0	0
Policy acquisition costs	0	0
Administrative expenses	58	73
Underwriting income (loss)	(69)	(82)
Net investment income	(79)	(84)
Other (income) expense	(45)	27
Amortization of purchased intangibles	42	(20)
Segment Income (loss)	(145)	(173)
Net realized gains (losses) including OTTI	(7)	(394)
Interest expense	154	146
Chubb integration expenses	111	148
Income tax expense	128	124
Net income	$ (545)	$ (985)

Earnings Per Share (Detail)

Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 1,093	$ 439
Weighted-average shares outstanding	468,903,086	446,739,586
Share-based compensation plans	3,828,604	3,270,156
Weighted-average shares outstanding and assumed conversions	472,731,690	450,009,742
Basic earnings per share (US$ per share)	$ 2.33	$ 0.98
Diluted earnings per share (US$ per share)	$ 2.31	$ 0.97
Potential anti-dilutive share conversions	969,654	2,074,308

Information provided in conne66

Information provided in connection with outstanding debt of subsidiaries Information provided in connection with outstanding debt of subsidiaries (Narrative) (Details)	Mar. 31, 2017
Debt Instrument [Line Items]
Equity Method Investment, Ownership Percentage	100.00%

Information Provided In Conne67

Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Detail) - USD ($) $ in Millions	Mar. 31, 2017		Dec. 31, 2016		Mar. 31, 2016		Dec. 31, 2015
Condensed Balance Sheet Statements, Captions [Line Items]
Investments	$ 99,491		$ 99,094
Cash	1,063	[1],[2]	985	[1],[3]	$ 1,091	[4]	$ 1,775	[4]
Insurance and reinsurance balances receivable	8,880		8,970
Reinsurance recoverable on losses and loss expenses	13,769		13,577
Reinsurance recoverable on policy benefits	187		182
Value of business acquired	345		355
Goodwill and other intangible assets	22,061		22,095
Investments in subsidiaries	0		0
Due from subsidiaries and affiliates, net	0		0
Other assets	15,171		14,528
Total assets	160,967		159,786
Unpaid losses and loss expenses	60,579		60,540		60,206		37,303
Unearned premiums	14,857		14,779
Future policy benefits	5,086		5,036
Due to subsidiaries and affiliates, net	0		0
Affiliated notional cash pooling programs	0		0
Repurchase agreements	1,404		1,403
Short-term debt	300		500
Long-term debt	12,300		12,610
Trust preferred securities	308		308
Other liabilities	16,909		16,335
Total liabilities	111,743		111,511
Total shareholders' equity	49,224		48,275		45,897
Total liabilities and shareholders’ equity	160,967		159,786
Chubb Limited (Parent Guarantor)
Condensed Balance Sheet Statements, Captions [Line Items]
Investments	25		27
Cash	6	[1],[2]	1	[1],[3]	2	[4]	1	[4]
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	39,156		38,408
Due from subsidiaries and affiliates, net	10,396		10,482
Other assets	4		3
Total assets	49,587		48,921
Unpaid losses and loss expenses	0		0
Unearned premiums	0		0
Future policy benefits	0		0
Due to subsidiaries and affiliates, net	0		0
Affiliated notional cash pooling programs	0	[2]	363	[3]
Repurchase agreements	0		0
Short-term debt	0		0
Long-term debt	0		0
Trust preferred securities	0		0
Other liabilities	363		283
Total liabilities	363		646
Total shareholders' equity	49,224		48,275
Total liabilities and shareholders’ equity	49,587		48,921
Chubb INA Holdings Inc (Subsidiary Issuer)
Condensed Balance Sheet Statements, Captions [Line Items]
Investments	304		485
Cash	1	[1],[2]	1	[1],[3]	3	[4]	2	[4]
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	50,242		49,509
Due from subsidiaries and affiliates, net	0		0
Other assets	519		436
Total assets	51,066		50,431
Unpaid losses and loss expenses	0		0
Unearned premiums	0		0
Future policy benefits	0		0
Due to subsidiaries and affiliates, net	10,028		10,209
Affiliated notional cash pooling programs	1,272	[2]	619	[3]
Repurchase agreements	0		0
Short-term debt	300		500
Long-term debt	12,289		12,599
Trust preferred securities	308		308
Other liabilities	1,699		1,582
Total liabilities	25,896		25,817
Total shareholders' equity	25,170		24,614
Total liabilities and shareholders’ equity	51,066		50,431
Other Chubb Limited Subsidiaries
Condensed Balance Sheet Statements, Captions [Line Items]
Investments	99,162		98,582
Cash	2,328	[1],[2]	1,965	[1],[3]	2,406	[4]	2,743	[4]
Insurance and reinsurance balances receivable	10,956		10,498
Reinsurance recoverable on losses and loss expenses	24,015		24,496
Reinsurance recoverable on policy benefits	1,145		1,153
Value of business acquired	345		355
Goodwill and other intangible assets	22,061		22,095
Investments in subsidiaries	0		0
Due from subsidiaries and affiliates, net	0		0
Other assets	18,642		18,442
Total assets	178,654		177,586
Unpaid losses and loss expenses	70,269		70,683
Unearned premiums	18,343		18,538
Future policy benefits	6,044		6,007
Due to subsidiaries and affiliates, net	368		273
Affiliated notional cash pooling programs	0	[2]	0	[3]
Repurchase agreements	1,404		1,403
Short-term debt	0		0
Long-term debt	11		11
Trust preferred securities	0		0
Other liabilities	17,987		17,368
Total liabilities	114,426		114,283
Total shareholders' equity	64,228		63,303
Total liabilities and shareholders’ equity	178,654		177,586
Consolidating Adjustments and Eliminations
Condensed Balance Sheet Statements, Captions [Line Items]
Investments	0		0
Cash	(1,272)	[1],[2]	(982)	[1],[3]	$ (1,320)	[4]	$ (971)	[4]
Insurance and reinsurance balances receivable	(2,076)		(1,528)
Reinsurance recoverable on losses and loss expenses	(10,246)		(10,919)
Reinsurance recoverable on policy benefits	(958)		(971)
Value of business acquired	0		0
Goodwill and other intangible assets	0		0
Investments in subsidiaries	(89,398)		(87,917)
Due from subsidiaries and affiliates, net	(10,396)		(10,482)
Other assets	(3,994)		(4,353)
Total assets	(118,340)		(117,152)
Unpaid losses and loss expenses	(9,690)		(10,143)
Unearned premiums	(3,486)		(3,759)
Future policy benefits	(958)		(971)
Due to subsidiaries and affiliates, net	(10,396)		(10,482)
Affiliated notional cash pooling programs	(1,272)	[2]	(982)	[3]
Repurchase agreements	0		0
Short-term debt	0		0
Long-term debt	0		0
Trust preferred securities	0		0
Other liabilities	(3,140)		(2,898)
Total liabilities	(28,942)		(29,235)
Total shareholders' equity	(89,398)		(87,917)
Total liabilities and shareholders’ equity	$ (118,340)		$ (117,152)
[1]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2017 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2017, 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, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[4]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 and December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Information Provided In Conne68

Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Statement of Income Captions [Line Items]
Net premiums written	$ 6,710	$ 5,995
Net premiums earned	6,772	6,597
Net investment income	745	674
Equity in earnings of subsidiaries	0	0
Net realized gains (losses) including OTTI	(7)	(394)
Losses and loss expenses	3,789	3,674
Policy benefits	168	126
Policy acquisition costs and administrative expenses	2,073	2,185
Interest (income) expense	154	146
Other (income) expense	(70)	28
Amortization of purchased intangibles	64	7
Chubb integration expenses	111	148
Income tax expense	128	124
Net income	1,093	439
Comprehensive income (loss)	1,407	1,541
Consolidating Adjustments and Eliminations
Condensed Statement of Income Captions [Line Items]
Net premiums written	0	0
Net premiums earned	0	0
Net investment income	0	0
Equity in earnings of subsidiaries	(1,728)	(881)
Net realized gains (losses) including OTTI	0	0
Losses and loss expenses	0	0
Policy benefits	0	0
Policy acquisition costs and administrative expenses	0	0
Interest (income) expense	0	0
Other (income) expense	0	0
Amortization of purchased intangibles	0	0
Chubb integration expenses	0	0
Income tax expense	0	0
Net income	(1,728)	(881)
Comprehensive income (loss)	(2,329)	(2,777)
Chubb Limited (Parent Guarantor)
Condensed Statement of Income Captions [Line Items]
Net premiums written	0	0
Net premiums earned	0	0
Net investment income	0	1
Equity in earnings of subsidiaries	1,027	375
Net realized gains (losses) including OTTI	0	0
Losses and loss expenses	0	0
Policy benefits	0	0
Policy acquisition costs and administrative expenses	18	17
Interest (income) expense	(84)	(80)
Other (income) expense	(6)	(9)
Amortization of purchased intangibles	0	0
Chubb integration expenses	0	3
Income tax expense	6	6
Net income	1,093	439
Comprehensive income (loss)	1,407	1,541
Chubb INA Holdings Inc (Subsidiary Issuer)
Condensed Statement of Income Captions [Line Items]
Net premiums written	0	0
Net premiums earned	0	0
Net investment income	3	4
Equity in earnings of subsidiaries	701	506
Net realized gains (losses) including OTTI	(13)	0
Losses and loss expenses	0	0
Policy benefits	0	0
Policy acquisition costs and administrative expenses	14	36
Interest (income) expense	221	215
Other (income) expense	15	10
Amortization of purchased intangibles	0	0
Chubb integration expenses	49	137
Income tax expense	(112)	(150)
Net income	504	262
Comprehensive income (loss)	791	1,056
Other Chubb Limited Subsidiaries
Condensed Statement of Income Captions [Line Items]
Net premiums written	6,710	5,995
Net premiums earned	6,772	6,597
Net investment income	742	669
Equity in earnings of subsidiaries	0	0
Net realized gains (losses) including OTTI	6	(394)
Losses and loss expenses	3,789	3,674
Policy benefits	168	126
Policy acquisition costs and administrative expenses	2,041	2,132
Interest (income) expense	17	11
Other (income) expense	(79)	27
Amortization of purchased intangibles	64	7
Chubb integration expenses	62	8
Income tax expense	234	268
Net income	1,224	619
Comprehensive income (loss)	$ 1,538	$ 1,721

Information Provided In Conne69

Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows from operating activities	$ 1,013		$ 1,020
Purchase of fixed maturities available for sale Securities Debt Condensed	(6,250)		(8,104)
Purchases of fixed maturities held to maturity	(157)		(77)
Purchases of equity securities	(37)		(33)
Sales of fixed maturities available for sale	3,395		6,329
Sales of equity securities	46		761
Maturities and redemptions of fixed maturities available for sale	2,543		1,553
Maturities and redemptions of fixed maturities held to maturity	240		249
Net change in short-term investments	232		11,932
Net derivative instruments settlements	(89)		(22)
Acquisition of subsidiaries (net of cash acquired of nil and $57)	0		(14,262)
Capital contribution			0
Other	17		59
Net cash flows used for investing activities	(60)		(1,615)
Cash Acquired from Acquisition	0		57
Dividends paid on Common Shares	(324)		(218)
Common Shares repurchased	(128)		0
Repayment of long-term debt	(500)		0
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase	753		853
Repayments of repurchase agreements	(752)		(853)
Proceeds from share-based compensation plans	42		51
Dividend to Parent Company	0		0
Advances (to) from affiliates	0		0
Capital contribution			0
Net proceeds from (payments to) affiliated notional cash pooling program	0		0
Policyholder contract deposits	109		118
Policyholder contract withdrawals	(58)		(49)
Other	0		(4)
Net cash flows used for financing activities	(858)		(102)
Effect of foreign currency rate changes on cash and cash equivalents	(17)		13
Net increase (decrease) in cash	78		(684)
Cash – beginning of period	985	[1],[2]	1,775	[3]
Cash – end of period	1,063	[2],[4]	1,091	[3]
Chubb Limited (Parent Guarantor)
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows from operating activities	584		3,272
Purchase of fixed maturities available for sale Securities Debt Condensed	0		0
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Sales of fixed maturities available for sale	0		0
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	0		0
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	0		0
Net derivative instruments settlements	0		0
Acquisition of subsidiaries (net of cash acquired of nil and $57)			0
Capital contribution			(2,330)
Other	0		0
Net cash flows used for investing activities	0		(2,330)
Dividends paid on Common Shares	(324)		(218)
Common Shares repurchased	0
Repayment of long-term debt	0
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase	0		0
Repayments of repurchase agreements	0		0
Proceeds from share-based compensation plans	0		0
Dividend to Parent Company	0		0
Advances (to) from affiliates	108		(362)
Capital contribution			0
Net proceeds from (payments to) affiliated notional cash pooling program	(363)	[2]	(361)	[3]
Policyholder contract deposits	0		0
Policyholder contract withdrawals	0		0
Other			0
Net cash flows used for financing activities	(579)		(941)
Effect of foreign currency rate changes on cash and cash equivalents	0		0
Net increase (decrease) in cash	5		1
Cash – beginning of period	1	[1],[2]	1	[3]
Cash – end of period	6	[2],[4]	2	[3]
Chubb INA Holdings Inc (Subsidiary Issuer)
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows from operating activities	(156)		3,109
Purchase of fixed maturities available for sale Securities Debt Condensed	(4)		0
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Sales of fixed maturities available for sale	0		0
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	7		0
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	173		7,788
Net derivative instruments settlements	(2)		0
Acquisition of subsidiaries (net of cash acquired of nil and $57)			(14,282)
Capital contribution			0
Other	0		0
Net cash flows used for investing activities	174		(6,494)
Dividends paid on Common Shares	0		0
Common Shares repurchased	0
Repayment of long-term debt	(500)
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase	0		0
Repayments of repurchase agreements	0		0
Proceeds from share-based compensation plans	0		0
Dividend to Parent Company	0		0
Advances (to) from affiliates	(171)		350
Capital contribution			2,330
Net proceeds from (payments to) affiliated notional cash pooling program	653	[2]	710	[3]
Policyholder contract deposits	0		0
Policyholder contract withdrawals	0		0
Other			(4)
Net cash flows used for financing activities	(18)		3,386
Effect of foreign currency rate changes on cash and cash equivalents	0		0
Net increase (decrease) in cash	0		1
Cash – beginning of period	1	[1],[2]	2	[3]
Cash – end of period	1	[2],[4]	3	[3]
Other Chubb Limited Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows from operating activities	1,081		1,011
Purchase of fixed maturities available for sale Securities Debt Condensed	(6,246)		(8,104)
Purchases of fixed maturities held to maturity	(157)		(77)
Purchases of equity securities	(37)		(33)
Sales of fixed maturities available for sale	3,395		6,329
Sales of equity securities	46		761
Maturities and redemptions of fixed maturities available for sale	2,536		1,553
Maturities and redemptions of fixed maturities held to maturity	240		249
Net change in short-term investments	59		4,144
Net derivative instruments settlements	(87)		(22)
Acquisition of subsidiaries (net of cash acquired of nil and $57)			20
Capital contribution			(2,330)
Other	17		59
Net cash flows used for investing activities	(234)		2,549
Dividends paid on Common Shares	0		0
Common Shares repurchased	(128)
Repayment of long-term debt	0
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase	753		853
Repayments of repurchase agreements	(752)		(853)
Proceeds from share-based compensation plans	42		51
Dividend to Parent Company	(496)		(6,372)
Advances (to) from affiliates	63		12
Capital contribution			2,330
Net proceeds from (payments to) affiliated notional cash pooling program	0	[2]	0	[3]
Policyholder contract deposits	109		118
Policyholder contract withdrawals	(58)		(49)
Other			0
Net cash flows used for financing activities	(467)		(3,910)
Effect of foreign currency rate changes on cash and cash equivalents	(17)		13
Net increase (decrease) in cash	363		(337)
Cash – beginning of period	1,965	[1],[2]	2,743	[3]
Cash – end of period	2,328	[2],[4]	2,406	[3]
Consolidating Adjustments and Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows from operating activities	(496)		(6,372)
Purchase of fixed maturities available for sale Securities Debt Condensed	0		0
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Sales of fixed maturities available for sale	0		0
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	0		0
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	0		0
Net derivative instruments settlements	0		0
Acquisition of subsidiaries (net of cash acquired of nil and $57)			0
Capital contribution			4,660
Other	0		0
Net cash flows used for investing activities	0		4,660
Dividends paid on Common Shares	0		0
Common Shares repurchased	0
Repayment of long-term debt	0
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase	0		0
Repayments of repurchase agreements	0		0
Proceeds from share-based compensation plans	0		0
Dividend to Parent Company	496		6,372
Advances (to) from affiliates	0		0
Capital contribution			(4,660)
Net proceeds from (payments to) affiliated notional cash pooling program	(290)	[2]	(349)
Policyholder contract deposits	0		0
Policyholder contract withdrawals	0		0
Other			0
Net cash flows used for financing activities	206		1,363
Effect of foreign currency rate changes on cash and cash equivalents	0		0
Net increase (decrease) in cash	(290)		(349)
Cash – beginning of period	(982)	[1],[2]	(971)	[3]
Cash – end of period	$ (1,272)	[2],[4]	$ (1,320)	[3]
[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, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2017 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3]	Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2016 and 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 March 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.