Chubb Limited (CB) 10-Q 4 Aug 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 20, 2015
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Trading Symbol	ACE
Entity Registrant Name	ACE Ltd
Entity Central Index Key	896,159
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		323,805,010

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2015		Dec. 31, 2014
Investments [Abstract]
Fixed maturities available for sale, at fair value (amortized cost - $47,599 and $47,826) (includes hybrid financial instruments of $282 and $274)		$ 48,701		$ 49,395
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)		8,676		7,331
Equity securities, at fair value (cost – $433 and $440)		498		510
Short-term investments, at fair value and amortized cost		2,062		2,322
Other investments (cost – $2,989 and $2,999)		3,328		3,346
Total investments		63,265		62,904
Cash	[1]	790	[2]	655	[3]
Securities lending collateral		1,080		1,330
Accrued investment income		534		552
Insurance and reinsurance balances receivable		5,757		5,426
Reinsurance recoverable on losses and loss expenses		11,775		11,992
Reinsurance recoverable on policy benefits		203		217
Deferred policy acquisition costs		2,806		2,601
Value of business acquired		434		466
Goodwill and other intangible assets		5,969		5,724
Prepaid reinsurance premiums		2,238		2,026
Deferred tax assets		285		295
Investments in partially-owned insurance companies		638		504
Other assets		4,066		3,556
Total assets		99,840		98,248
Liabilities
Unpaid losses and loss expenses		38,230		38,315
Unearned premiums		8,879		8,222
Future policy benefits		4,835		4,754
Insurance and reinsurance balances payable		4,602		4,095
Securities lending payable		1,081		1,331
Accounts payable, accrued expenses, and other liabilities		6,090		5,726
Short-term debt		2,102		2,552
Long-term debt		4,157		3,357
Trust preferred securities		309		309
Total liabilities		$ 70,285		$ 68,661
Commitments and contingencies
Shareholders’ equity
Common Shares (CHF 24.15 and CHF 24.77 par value; 342,832,412 shares issued; 323,814,281 and 328,659,686 shares outstanding)		$ 7,833		$ 8,055
Common Shares in treasury (19,018,131 and 14,172,726 shares)		(1,999)		(1,448)
Additional paid-in capital		4,847		5,145
Retained earnings		18,267		16,644
Accumulated other comprehensive income (AOCI)		607		1,191
Total shareholders’ equity		29,555		29,587
Total liabilities and shareholders’ equity		$ 99,840		$ 98,248
[1]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2014, 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	Jun. 30, 2015USD ($)shares	Dec. 31, 2014USD ($)shares
Statement of Financial Position [Abstract]
Fixed maturities available for sale, at amortized cost	$ 47,599	$ 47,826
Fixed maturities available for sale, hybrid financial instruments	282	274
Fixed maturities held to maturity, at amortized cost	8,805	7,589
Equity securities, at cost	433	440
Other investments, cost	$ 2,989	$ 2,999
Common Shares, shares issued | shares	342,832,412	342,832,412
Common Shares, shares outstanding | shares	323,814,281	328,659,686
Common Shares in treasury, shares | shares	19,018,131	14,172,726

Consolidated Statements Of Oper

Consolidated Statements Of Operations and Comprehensive Income - Entity [Domain] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Net premiums written	$ 4,784	$ 4,559	$ 8,860	$ 8,744
Increase in unearned premiums	(424)	(227)	(573)	(442)
Net premiums earned	4,360	4,332	8,287	8,302
Net investment income	562	556	1,113	1,109
Net realized gains (losses):
Other-than-temporary impairment (OTTI) losses gross	(14)	(13)	(27)	(25)
Portion of OTTI losses recognized in other comprehensive income (OCI)	6	1	6	2
Net OTTI losses recognized in income	(8)	(12)	(21)	(23)
Net realized gains (losses) excluding OTTI losses	134	(61)	58	(154)
Total net realized gains (losses) (includes $34, $21, $31, and $27 reclassified from AOCI)	126	(73)	37	(177)
Total revenues	5,048	4,815	9,437	9,234
Expenses
Losses and loss expenses	2,417	2,388	4,539	4,549
Policy benefits	153	144	295	258
Policy acquisition costs	727	758	1,434	1,486
Administrative expenses	578	566	1,132	1,101
Interest expense	71	72	139	143
Other (income) expense	17	(25)	12	(42)
Total expenses	3,963	3,903	7,551	7,495
Income before income tax	1,085	912	1,886	1,739
Income tax expense (includes $10, $5, $14, and $2 on reclassified unrealized gains)	143	133	263	226
Net income	942	779	1,623	1,513
Other comprehensive income (loss)
Unrealized appreciation (depreciation)	(816)	589	(375)	1,108
Reclassification adjustment for net realized gains included in net income	(34)	(21)	(31)	(27)
Unrealized appreciation (Depreciation) after reclassification adjustment	(850)	568	(406)	1,081
Change in:
Cumulative translation adjustment	136	153	(285)	120
Pension liability	(6)	(5)	7	(13)
Other comprehensive income (loss), before income tax	(720)	716	(684)	1,188
Income tax (expense) benefit related to OCI items	175	(147)	100	(245)
Other comprehensive income (loss)	(545)	569	(584)	943
Comprehensive income	$ 397	$ 1,348	$ 1,039	$ 2,456
Earnings per share
Basic earnings per share	$ 2.89	$ 2.30	$ 4.97	$ 4.47
Diluted earnings per share	$ 2.86	$ 2.28	$ 4.91	$ 4.43
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Net realized gains (losses):
Total net realized gains (losses) (includes $34, $21, $31, and $27 reclassified from AOCI)	$ 34	$ 21	$ 31	$ 27
Expenses
Income tax expense (includes $10, $5, $14, and $2 on reclassified unrealized gains)	$ 10	$ 5	$ 14	$ 2

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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income tax expense (benefit)	$ 143	$ 133	$ 263	$ 226
Net realized gains (losses)	126	(73)	37	(177)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Income tax expense (benefit)	10	5	14	2
Net realized gains (losses)	$ 34	$ 21	$ 31	$ 27

Consolidated Statements Of Shar

Consolidated Statements Of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Net Unrealized Investment Gain (Loss) [Member]	Accumulated Translation Adjustment [Member]	Accumulated Defined Benefit Plans Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance - beginning of period at Dec. 31, 2013		$ 8,899	$ (255)	$ 5,238	$ 13,791	$ 1,174	$ 63	$ (85)
Dividends declared on Common Shares – par value reduction		(398)
Net shares redeemed under employee share-based compensation plans			194	(169)
Common Shares repurchased			(569)
Exercise of stock options				(33)
Share-based compensation expense and other				100
Funding of dividends declared to Retained earnings				(81)
Net income	$ 1,513				1,513
Funding of dividends declared from Additional paid-in capital					81
Dividends declared on Common Shares					(81)
Change in period, before reclassification from AOCI, net of income tax benefit (expense) of $81 and $(210)						898
Amounts reclassified from AOCI, net of income tax benefit of $14 and $2						(25)
Change in period, net of income tax benefit (expense) of $95 and $(208)						873
Change in period, net of income tax benefit (expense) of $7 and $(42)							78
Change in period, net of income tax benefit (expense) of $(2) and $5								(8)
Balance - end of period at Jun. 30, 2014	30,325	8,501	(630)	5,055	15,304	2,047	141	(93)	$ 2,095
Balance - beginning of period at Dec. 31, 2014	29,587	8,055	(1,448)	5,145	16,644	1,851	(581)	(79)
Dividends declared on Common Shares – par value reduction		(222)
Net shares redeemed under employee share-based compensation plans			183	(163)
Common Shares repurchased			(734)
Exercise of stock options				(29)
Share-based compensation expense and other				111
Funding of dividends declared to Retained earnings				(217)
Net income	1,623				1,623
Funding of dividends declared from Additional paid-in capital					217
Dividends declared on Common Shares					(217)
Change in period, before reclassification from AOCI, net of income tax benefit (expense) of $81 and $(210)						(294)
Amounts reclassified from AOCI, net of income tax benefit of $14 and $2						(17)
Change in period, net of income tax benefit (expense) of $95 and $(208)						(311)
Change in period, net of income tax benefit (expense) of $7 and $(42)							(278)
Change in period, net of income tax benefit (expense) of $(2) and $5								5
Balance - end of period at Jun. 30, 2015	$ 29,555	$ 7,833	$ (1,999)	$ 4,847	$ 18,267	$ 1,540	$ (859)	$ (74)	$ 607

Consolidated Statements Of Sha7

Consolidated Statements Of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Net unrealized appreciation on investments, Change in period, income tax (expense) benefit	$ 95	$ (208)
Cumulative translation adjustment, Change in period, income tax(expense) benefit	7	(42)
Pension liability adjustment, Change in period, income tax (expense) benefit	(2)	5
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	81	(210)
Income tax benefit (expense) from reclassification of unrealized gains	$ 14	$ 2

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014
Cash flows from operating activities
Net income	$ 1,623		$ 1,513
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	(37)		177
Amortization of premiums/discounts on fixed maturities	71		115
Deferred income taxes	108		117
Unpaid losses and loss expenses	(87)		(493)
Unearned premiums	420		594
Future policy benefits	114		139
Insurance and reinsurance balances payable	532		142
Accounts payable, accrued expenses, and other liabilities	48		37
Income taxes payable	(120)		(56)
Insurance and reinsurance balances receivable	(332)		(244)
Reinsurance recoverable on losses and loss expenses	55		546
Reinsurance recoverable on policy benefits	16		(14)
Deferred policy acquisition costs	(236)		(228)
Prepaid reinsurance premiums	(261)		(171)
Other	(23)		(78)
Net cash flows from operating activities	1,891		2,096
Cash flows from investing activities
Purchases of fixed maturities available for sale	(9,179)		(7,960)
Purchases of to be announced mortgage-backed securities	(31)		0
Purchases of fixed maturities held to maturity	(24)		(129)
Purchases of equity securities	(70)		(64)
Sales of fixed maturities available for sale	3,611		3,842
Proceeds From Sales To Be Announced Mortgage Backed Securities	31		0
Sales of equity securities	102		45
Maturities and redemptions of fixed maturities available for sale	3,691		3,163
Maturities and redemptions of fixed maturities held to maturity	470		414
Net change in short-term investments	228		(295)
Net derivative instruments settlements	(33)		(185)
Payments to Acquire Businesses, Net of Cash Acquired	255		(172)
Other	(71)		(118)
Net cash flows used for investing activities	(1,020)		(1,459)
Cash flows from financing activities
Dividends paid on Common Shares	(427)		(428)
Common Shares repurchased	(750)		(557)
Proceeds from issuance of long-term debt	800		699
Proceeds from issuance of short-term debt	1,327		977
Repayments of Long-term Debt	(450)		(500)
Repayment of short-term debt	(1,327)		(977)
Proceeds from share-based compensation plans, including windfall tax benefits	46		75
Policyholder contract deposits	235		125
Policyholder contract withdrawals	(107)		(33)
Other	(6)		(6)
Net cash flows used for financing activities	(659)		(625)
Effect of foreign currency rate changes on cash and cash equivalents	(77)		3
Net increase in cash	135		15
Cash – beginning of period	655	[1],[2]	579	[3]
Cash – end of period	790	[2],[4]	594	[3]
Supplemental cash flow information
Taxes paid	263		148
Interest paid	$ 127		$ 134
[1]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2014 and December 31, 2013, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[4]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015, 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	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement of Cash Flows [Abstract]
Cash Acquired from Acquisition	$ 620	$ 4

General

General	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General a) Basis of presentation ACE Limited is a holding company incorporated in Zurich, Switzerland. ACE Limited, through its subsidiaries, provides a broad range of insurance and reinsurance products to insureds worldwide. ACE operates through five business segments: Insurance – North American P&C, Insurance – North American Agriculture, Insurance – Overseas General, Global Reinsurance, and Life. Refer to Note 10 for additional information. The interim unaudited consolidated financial statements, which include the accounts of ACE Limited and its subsidiaries (collectively, ACE, 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 2014 Form 10-K. b) Accounting guidance not yet adopted Presentation of Debt Issuance Costs In April 2015, the Financial Accounting Standards Board issued new guidance related to the accounting for debt issuance costs. The new guidance requires presentation of debt issuance costs in the balance sheet as a deduction from the carrying amount of the related debt liability instead of a deferred charge. The new guidance requires retrospective adoption and is effective for interim and annual reporting periods beginning after December 15, 2015, with early adoption permitted. The adoption of this guidance will not have any effect on our results of operations and financial condition.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2015
Business Combinations [Abstract]
Acquisitions	Acquisitions Fireman's Fund Insurance Company High Net Worth Personal Lines Insurance Business in the U.S. (Fireman's Fund) On April 1, 2015, we acquired the Fireman's Fund Insurance Company high net worth personal lines insurance business in the U.S., which included the renewal rights for new and existing business and reinsurance of all existing reserves for $365 million in cash. We acquired assets with a fair value of $ 749 million , consisting primarily of cash of $ 620 million and insurance and reinsurance balances receivable of $ 128 million . We assumed liabilities with a fair value of $ 858 million , consisting primarily of unpaid losses and loss expenses of $ 402 million and unearned premiums of $ 428 million . This acquisition generated $ 208 million of goodwill, attributable to expected growth and profitability, all of which is expected to be deductible for income tax purposes, and other intangible assets of $ 266 million , primarily related to renewal rights, based on ACE’s preliminary purchase price allocation. The acquisition expands our position in the high net worth personal lines insurers in the U.S. The Fireman’s Fund business integrates into our existing high net worth personal lines business, ACE Private Risk Services, which offers a broad range of coverage including homeowners, automobile, umbrella and excess liability, collectibles and yachts. Goodwill and other intangible assets arising from this acquisition are included in our Insurance – North American P&C segment. Large Corporate Account P&C Insurance Business of Itaú Seguros, S.A. (Itaú Seguros) On October 31, 2014, we expanded our presence in Brazil with the acquisition of the large corporate account property and casualty (P&C) insurance business of Itaú Seguros, Brazil's leading carrier for that business, for $610 million in cash, subject to a working capital adjustment under the purchase agreement expected to be finalized in the third quarter of 2015. This acquisition generated $449 million of goodwill, attributable to expected growth and profitability, none of which is currently deductible for income tax purposes, and other intangible a s sets of $60 million , primarily related to renewal rights, based on ACE’s preliminary purchase price allocation. Goodwill may become deductible for income tax purposes under Brazilian tax law if this acquired entity is merged with certain ACE legal entities. The Siam Commercial Samaggi Insurance PCL (Samaggi) We and our local partner acquired 60.86 percent of Samaggi, a general insurance company in Thailand, from Siam Commercial Bank on April 28, 2014, and subsequently acquired an additional 32.17 percent ownership, through a mandatory tender offer, which expired on June 17, 2014. The purchase price for 93.03 percent of the company was $ 176 million in cash. This acquisition expands our presence in Thailand and Southeast Asia. The acquisition generated $ 46 million of goodwill, attributable to expected growth and profitability, none of which is expected to be deductible for income tax purposes, and other intangible assets of $ 80 million based on ACE’s purchase price allocation. The other intangible assets primarily relate to a bancassurance agreement. Goodwill and other intangible assets arising from the acquisitions of Itaú Seguros and Samaggi are included in our Insurance – Overseas General segment. The consolidated financial statements include results of acquired businesses from the acquisition dates. To be acquired The Chubb Corporation (Chubb) On June 30, 2015, we entered into a definitive agreement to acquire Chubb, a leading provider of middle-market commercial, specialty, surety, and personal insurance. Under the terms of the merger agreement, when the transaction closes Chubb will be merged with a newly-formed subsidiary of ACE and Chubb shareholders will receive for each share of Chubb stock an aggregate $62.93 in cash and 0.6019 shares of ACE stock. Based on the closing price of ACE stock on June 30, 2015 of $101.68 per share, the purchase price would be approximately $28.3 billion in cash and newly issued stock, and the former Chubb shareholders would own approximately 137 million shares, or 30 percent, of the combined company's outstanding shares. The merger agreement provides that following the close of the transaction (i) the acquired businesses will continue to operate under the Chubb names as they do now; (ii) we will change the name of ACE Limited to assume the Chubb name at our parent company level, and (iii) the combined company will transition to operate under the Chubb name globally. We intend to finance the cash portion of the transaction through a combination of $9 billion sourced from various ACE and Chubb companies plus $5.3 billion of senior notes with a range of maturities to be determined. The transaction is expected to close during the first quarter of 2016, subject to approval by ACE and Chubb shareholders, the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and insurance and other antitrust regulatory approvals.

Investments

Investments	6 Months Ended
	Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Investments	Investments a) Transfers of securities During April 2015, we transferred securities, considered essential holdings in a diversified portfolio, with a total fair value of $ 1.9 billion from Fixed maturities available for sale to Fixed maturities held to maturity. These securities, which we have the intent and ability to hold to maturity, were transferred given the growth in ACE’s investment portfolio over the last several years, as well as continued efforts to manage the diversification of our global portfolio. The net unrealized appreciation at the date of the transfer continues to be reported in the carrying value of the transferred investments and is amortized through OCI over the remaining life of the securities using the effective interest method in a manner consistent with the amortization of any premium or discount. This transfer represents a non-cash transaction and does not impact the consolidated statements of cash flows. b) Fixed maturities June 30, 2015 Amortized Cost Gross Unrealized Appreciation Gross Unrealized Depreciation Fair Value OTTI Recognized in AOCI (in millions of U.S. dollars) Available for sale U.S. Treasury and agency $ 2,743 $ 67 $ (5 ) $ 2,805 $ — Foreign 14,739 529 (112 ) 15,156 (5 ) Corporate securities 16,515 534 (171 ) 16,878 (6 ) Mortgage-backed securities 10,607 237 (60 ) 10,784 (1 ) States, municipalities, and political subdivisions 2,995 97 (14 ) 3,078 — $ 47,599 $ 1,464 $ (362 ) $ 48,701 $ (12 ) Held to maturity U.S. Treasury and agency $ 743 $ 16 $ (1 ) $ 758 $ — Foreign 808 39 (4 ) 843 — Corporate securities 3,113 72 (56 ) 3,129 — Mortgage-backed securities 1,828 50 (1 ) 1,877 — States, municipalities, and political subdivisions 2,184 32 (18 ) 2,198 — $ 8,676 $ 209 $ (80 ) $ 8,805 $ — December 31, 2014 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 $ 2,741 $ 87 $ (8 ) $ 2,820 $ — Foreign 14,703 629 (90 ) 15,242 — Corporate securities 16,897 704 (170 ) 17,431 (7 ) Mortgage-backed securities 10,011 304 (29 ) 10,286 (1 ) States, municipalities, and political subdivisions 3,474 147 (5 ) 3,616 — $ 47,826 $ 1,871 $ (302 ) $ 49,395 $ (8 ) Held to maturity U.S. Treasury and agency $ 832 $ 20 $ (2 ) $ 850 $ — Foreign 916 47 — 963 — Corporate securities 2,323 102 (2 ) 2,423 — Mortgage-backed securities 1,983 57 (1 ) 2,039 — States, municipalities, and political subdivisions 1,277 40 (3 ) 1,314 — $ 7,331 $ 266 $ (8 ) $ 7,589 $ — As discussed in Note 3 e), if a credit loss is incurred on an impaired fixed maturity, an OTTI is considered to have occurred and the portion of the impairment not related to credit losses (non-credit OTTI) is recognized in OCI. Included in the “OTTI Recognized in AOCI” columns above are the cumulative amounts of non-credit OTTI recognized in OCI adjusted for subsequent sales, maturities, and redemptions. OTTI recognized in AOCI does not include the impact of subsequent changes in fair value of the related securities. In periods subsequent to a recognition of OTTI in OCI, changes in the fair value of the related fixed maturities are reflected in Unrealized appreciation (depreciation) in the consolidated statement of shareholders’ equity. For the three and six months ended June 30, 2015 , nil and $4 million , respectively, of net unrealized appreciation related to such securities is included in OCI. For the three and six months ended June 30, 2014 , $1 million and $5 million , respectively, of net unrealized appreciation related to such securities is included in OCI. At June 30, 2015 and December 31, 2014 , AOCI included cumulative net unrealized depreciation of $7 million and $3 million, respectively, related to securities remaining in the investment portfolio for which ACE has recognized a non-credit OTTI. Mortgage-backed securities (MBS) issued by U.S. government agencies are combined with all other to be announced mortgage derivatives held (refer to Note 7 c) (iv)) and are included in the category, “Mortgage-backed securities”. Approximately 80 percent and 83 percent of the total mortgage-backed securities at June 30, 2015 and December 31, 2014 , 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: June 30 December 31 2015 2014 (in millions of U.S. dollars) Amortized Cost Fair Value Amortized Cost Fair Value Available for sale Due in 1 year or less $ 1,906 $ 1,925 $ 2,187 $ 2,206 Due after 1 year through 5 years 16,377 16,808 15,444 15,857 Due after 5 years through 10 years 14,321 14,549 15,663 16,089 Due after 10 years 4,388 4,635 4,521 4,957 36,992 37,917 37,815 39,109 Mortgage-backed securities 10,607 10,784 10,011 10,286 $ 47,599 $ 48,701 $ 47,826 $ 49,395 Held to maturity Due in 1 year or less $ 377 $ 381 $ 353 $ 355 Due after 1 year through 5 years 2,589 2,685 2,603 2,693 Due after 5 years through 10 years 2,351 2,351 1,439 1,489 Due after 10 years 1,531 1,511 953 1,013 6,848 6,928 5,348 5,550 Mortgage-backed securities 1,828 1,877 1,983 2,039 $ 8,676 $ 8,805 $ 7,331 $ 7,589 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. c) Equity securities June 30 December 31 (in millions of U.S. dollars) 2015 2014 Cost $ 433 $ 440 Gross unrealized appreciation 77 83 Gross unrealized depreciation (12 ) (13 ) Fair value $ 498 $ 510 d) Investments in partially-owned insurance companies On March 27, 2015 and April 14, 2015, we paid $ 70 million and $ 20 million , respectively, to acquire 11.3 percent of the common equity of ABR Reinsurance Capital Holdings Ltd. and warrants to acquire 0.5 percent of additional equity. ABR Reinsurance Capital Holdings Ltd., is the parent company of ABR Reinsurance Ltd. (ABR Re), an independent reinsurance company. Through long-term arrangements, ACE will be the sole source of reinsurance risks ceded to ABR Re, and BlackRock, Inc. will be ABR Re’s exclusive investment management service provider. As an investor, ACE is expected to benefit from underwriting profit generated by ABR Re’s reinsuring a wide range of ACE’s primary insurance business and the income and capital appreciation BlackRock, Inc. seeks to deliver through its investment management services. In addition, ACE’s long-term arrangements with BlackRock, Inc. include a fee sharing arrangement in which ACE and BlackRock, Inc. will be entitled to an equal share of the aggregate amount of certain fees, including underwriting and investment management performance related fees. ABR Re is a variable interest entity; however, ACE is not the primary beneficiary and does not consolidate ABR Re because ACE does not have the power to control and direct ABR Re’s most significant activities, including investing and underwriting. Our minority ownership interest is accounted for under the equity method of accounting. ACE cedes premiums to ABR Re and recognizes the associated commissions. For both the three and six months ended June 30, 2015, ACE ceded reinsurance premiums of $ 35 million and recognized ceded commissions of $ 11 million . At June 30, 2015, the amount of Reinsurance recoverable on losses and loss expenses was $ 5 million and the amount of ceded reinsurance premium payable included in Insurance and reinsurance balances payable in the consolidated balance sheet was $ 18 million . e) 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, ACE 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 • ACE’s ability and intent to hold the security to the expected recovery period. As a general rule, we also consider that equity securities in an unrealized loss position for twelve consecutive months are other than temporarily impaired. For mutual funds included in equity securities in our consolidated balance sheet, we employ analysis similar to fixed maturities, when applicable. We review each fixed maturity in an unrealized loss position to assess whether the security is a candidate for credit loss. Specifically, we consider credit rating, market price, and issuer-specific financial information, among other factors, to assess the likelihood of collection of all principal and interest as contractually due. Securities for which we determine that credit loss is likely are subjected to further analysis to estimate the credit loss recognized in Net income, if any. In general, credit loss recognized in Net income equals the difference between the security’s amortized cost and the net present value of its projected future cash flows discounted at the effective interest rate implicit in the debt security. All significant assumptions used in determining credit losses are subject to change as market conditions evolve. Projected cash flows for corporate securities (principally senior unsecured bonds) are driven primarily by assumptions regarding probability of default and also the timing and amount of recoveries associated with defaults. ACE 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, ACE assumed a 32 percent recovery rate (the par value of a defaulted security that will be recovered) across all rating categories rather than using Moody's historical mean recovery rate of 42 percent. We believe that use of a default assumption in excess of the historical mean is conservative in light of current market conditions. For the three and six months ended June 30, 2015 , credit losses recognized in Net income for corporate securities were $5 million and $9 million , respectively. For the three and six months ended June 30, 2014 credit losses recognized in Net income for corporate securities were $6 million and $10 million , respectively. For mortgage-backed securities, credit impairment is assessed using a cash flow model that estimates the cash flows on the underlying mortgages, using the security-specific collateral and transaction structure. The model estimates cash flows from the underlying mortgage loans and distributes those cash flows to various tranches of securities, considering the transaction structure and any subordination and credit enhancements that exist in that structure. The cash flow model incorporates actual cash flows on the mortgage-backed securities through the current period and then projects the remaining cash flows using a number of assumptions, including default rates, prepayment rates, and loss severity rates (the par value of a defaulted security that will not be recovered) on foreclosed properties. For the three and six months ended June 30, 2015 and 2014 , 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 Six Months Ended June 30 June 30 (in millions of U.S. dollars) 2015 2014 2015 2014 Fixed maturities: OTTI on fixed maturities, gross $ (13 ) $ (9 ) $ (26 ) $ (15 ) OTTI on fixed maturities recognized in OCI (pre-tax) 6 1 6 2 OTTI on fixed maturities, net (7 ) (8 ) (20 ) (13 ) Gross realized gains excluding OTTI 28 54 72 90 Gross realized losses excluding OTTI (16 ) (26 ) (51 ) (46 ) Total fixed maturities 5 20 1 31 Equity securities: OTTI on equity securities (1 ) (1 ) (1 ) (7 ) Gross realized gains excluding OTTI 30 2 33 4 Gross realized losses excluding OTTI — — (2 ) (1 ) Total equity securities 29 1 30 (4 ) OTTI on other investments — (3 ) — (3 ) Foreign exchange losses (40 ) (14 ) (71 ) (23 ) Investment and embedded derivative instruments 27 (15 ) 28 (40 ) Fair value adjustments on insurance derivative 104 2 59 (46 ) S&P put options and futures (2 ) (72 ) (14 ) (91 ) Other derivative instruments (1 ) 9 (1 ) 7 Other 4 (1 ) 5 (8 ) Net realized gains (losses) $ 126 $ (73 ) $ 37 $ (177 ) 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 Six Months Ended June 30 June 30 (in millions of U.S. dollars) 2015 2014 2015 2014 Balance of credit losses related to securities still held – beginning of period $ 22 $ 35 $ 28 $ 37 Additions where no OTTI was previously recorded 4 5 7 7 Additions where an OTTI was previously recorded 1 1 2 3 Reductions for securities sold during the period (4 ) (17 ) (14 ) (23 ) Balance of credit losses related to securities still held – end of period $ 23 $ 24 $ 23 $ 24 f) Gross unrealized loss At June 30, 2015 , there were 7,253 fixed maturities out of a total of 26,933 fixed maturities in an unrealized loss position. The largest single unrealized loss in the fixed maturities was $5 million . There were 99 equity securities out of a total of 271 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 June 30, 2015 , 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 June 30, 2015 Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss (in millions of U.S. dollars) U.S. Treasury and agency $ 693 $ (5 ) $ 137 $ (1 ) $ 830 $ (6 ) Foreign 3,867 (104 ) 273 (12 ) 4,140 (116 ) Corporate securities 6,361 (195 ) 520 (32 ) 6,881 (227 ) Mortgage-backed securities 3,430 (46 ) 495 (15 ) 3,925 (61 ) States, municipalities, and political subdivisions 2,215 (30 ) 87 (2 ) 2,302 (32 ) Total fixed maturities 16,566 (380 ) 1,512 (62 ) 18,078 (442 ) Equity securities 80 (12 ) — — 80 (12 ) Other investments 33 (2 ) — — 33 (2 ) Total $ 16,679 $ (394 ) $ 1,512 $ (62 ) $ 18,191 $ (456 ) 0 – 12 Months Over 12 Months Total December 31, 2014 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 $ 350 $ (1 ) $ 666 $ (9 ) $ 1,016 $ (10 ) Foreign 2,262 (75 ) 375 (15 ) 2,637 (90 ) Corporate securities 4,684 (150 ) 738 (22 ) 5,422 (172 ) Mortgage-backed securities 704 (2 ) 1,663 (28 ) 2,367 (30 ) States, municipalities, and political subdivisions 458 (3 ) 490 (5 ) 948 (8 ) Total fixed maturities 8,458 (231 ) 3,932 (79 ) 12,390 (310 ) Equity securities 101 (13 ) — — 101 (13 ) Total $ 8,559 $ (244 ) $ 3,932 $ (79 ) $ 12,491 $ (323 ) g) Restricted assets ACE 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. ACE is also required to restrict assets pledged under repurchase agreements, which represent ACE'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 June 30, 2015 and December 31, 2014 , are investments, primarily fixed maturities, totaling $16.5 billion and $16.3 billion, respectively, and cash of $80 million and $117 million, respectively. The following table presents the components of restricted assets: June 30 December 31 (in millions of U.S. dollars) 2015 2014 Trust funds $ 11,085 $ 10,838 Deposits with non-U.S. regulatory authorities 2,263 2,305 Assets pledged under repurchase agreements 1,458 1,431 Deposits with U.S. regulatory authorities 1,327 1,345 Other pledged assets 398 457 $ 16,531 $ 16,376

Fair value measurements

Fair value measurements	6 Months Ended
	Jun. 30, 2015
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). The majority of these investments, for which NAV was used as a practical expedient to measure fair value, are classified within Level 3 because either ACE will never have the contractual option to redeem the investments or will not have the contractual option to redeem the investments in the near term. The remainder of such investments is classified within Level 2. 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 and fixed maturities held in rabbi trusts maintained by ACE for deferred compensation plans, which are classified within the valuation hierarchy on the same basis as other equity securities and fixed maturities. 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 ACE’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 maintain positions in other derivative instruments including exchange-traded equity futures contracts and option contracts designed to limit exposure to a severe equity market decline, which would cause an increase in expected claims and, therefore, an increase in reserves for our guaranteed minimum death benefits (GMDB) and guaranteed living benefits (GLB) reinsurance business. Our position in exchange-traded equity futures contracts is classified within Level 1. 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 ACE. 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, ACE estimates fair value using an internal valuation model which includes current market information and estimates of policyholder behavior. All of the treaties contain claim limits, which are factored into the valuation model. The fair value depends on a number of factors, including interest rates, equity markets, credit risk, current account value, market volatility, expected annuitization rates, and other policyholder behavior and changes in policyholder mortality. The most significant policyholder behavior assumptions include lapse rates and the GMIB annuitization rates. Assumptions regarding lapse rates and GMIB annuitization rates differ by treaty, but the underlying methodologies to determine rates applied to each treaty are comparable. A lapse rate is the percentage of in-force policies surrendered in a given calendar year. All else equal, as lapse rates increase, ultimate claim payments will decrease. GMIB annuitization rate is the percentage of policies for which the policyholder will elect to annuitize using the guaranteed benefit provided under the GMIB. All else equal, as GMIB annuitization rates increase, ultimate claim payments will increase, subject to treaty claim limits. The effect of changes in key market factors on assumed lapse and annuitization rates reflect emerging trends using data available from cedants. For treaties with limited experience, rates are established in line with data received from other ceding companies adjusted, as appropriate, with industry estimates. The model and related assumptions are regularly re-evaluated by management and enhanced, as appropriate, based upon additional experience obtained related to policyholder behavior and availability of updated information such as market conditions, market participant assumptions, and demographics of in-force annuities. Because of the significant use of unobservable inputs including policyholder behavior, GLB reinsurance is classified within Level 3. For the three and six months ended June 30, 2015 and 2014, 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 2014 Form 10-K. Financial instruments measured at fair value on a recurring basis, by valuation hierarchy June 30, 2015 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available for sale U.S. Treasury and agency $ 1,741 $ 1,064 $ — $ 2,805 Foreign — 15,100 56 15,156 Corporate securities — 16,711 167 16,878 Mortgage-backed securities — 10,729 55 10,784 States, municipalities, and political subdivisions — 3,078 — 3,078 1,741 46,682 278 48,701 Equity securities 483 13 2 498 Short-term investments 1,108 954 — 2,062 Other investments 370 279 2,679 3,328 Securities lending collateral — 1,080 — 1,080 Investment derivative instruments 16 — — 16 Other derivative instruments 23 — — 23 Separate account assets 1,567 84 — 1,651 Total assets measured at fair value $ 5,308 $ 49,092 $ 2,959 $ 57,359 Liabilities: Investment derivative instruments $ 15 $ — $ — $ 15 Other derivative instruments — — 3 3 GLB (1) — — 347 347 Total liabilities measured at fair value $ 15 $ — $ 350 $ 365 (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 liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information. December 31, 2014 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available for sale U.S. Treasury and agency $ 1,680 $ 1,140 $ — $ 2,820 Foreign — 15,220 22 15,242 Corporate securities — 17,244 187 17,431 Mortgage-backed securities — 10,271 15 10,286 States, municipalities, and political subdivisions — 3,616 — 3,616 1,680 47,491 224 49,395 Equity securities 492 16 2 510 Short-term investments 1,183 1,139 — 2,322 Other investments 370 257 2,719 3,346 Securities lending collateral — 1,330 — 1,330 Investment derivative instruments 18 — — 18 Other derivative instruments — 2 — 2 Separate account assets 1,400 90 — 1,490 Total assets measured at fair value $ 5,143 $ 50,325 $ 2,945 $ 58,413 Liabilities: Investment derivative instruments $ 36 $ — $ — $ 36 Other derivative instruments 21 — 4 25 GLB (1) — — 406 406 Total liabilities measured at fair value $ 57 $ — $ 410 $ 467 (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 liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information. There were no transfers between Level 1 and Level 2 for the three and six months ended June 30, 2015 and 2014. Fair value of alternative investments Included in Other investments in the fair value hierarchy are 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: June 30 December 31 Expected Liquidation Period of Underlying Assets 2015 2014 (in millions of U.S. dollars) Fair Value Maximum Future Funding Commitments Fair Value Maximum Future Funding Commitments Financial 5 to 9 Years $ 306 $ 124 $ 282 $ 145 Real Assets 3 to 7 Years 460 177 451 210 Distressed 5 to 9 Years 242 252 232 175 Private Credit 3 to 7 Years 291 234 299 190 Traditional 3 to 9 Years 897 224 908 289 Vintage 1 to 2 Years 16 — 11 1 Investment funds Not Applicable 306 — 378 — $ 2,518 $ 1,011 $ 2,561 $ 1,010 In 2015, we redefined and regrouped certain alternative investment categories to better align with our management approach. The prior year amounts have been reclassified to conform to the current year presentation. Included in all categories in the above table except for Investment funds are investments for which ACE 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, ACE 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 ACE’s investment funds employ various investment strategies such as long/short equity and arbitrage/distressed. Included in this category are investments for which ACE 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 ACE 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 ACE 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, ACE 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 ACE’s investment within several months of the notification. Notice periods for redemption of the investment funds range between 5 and 120 days. ACE 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 or net asset value 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 June 30, 2015 December 31, 2014 GLB (1) $ 347 $ 406 Actuarial model Lapse rate 1% – 30% Annuitization rate 0% – 55% (1) Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 4 a) Guaranteed living benefits. The following tables present a reconciliation of the beginning and ending balances of financial instruments measured at fair value using significant unobservable inputs (Level 3): Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity securities Other investments Other derivative instruments GLB (1) June 30, 2015 Foreign Corporate securities MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 22 $ 167 $ 33 $ 2 $ 2,789 $ 4 $ 451 Transfers into Level 3 28 12 — — — — — Transfers out of Level 3 — — — — — — — Change in Net Unrealized Gains (Losses) included in OCI (2 ) (3 ) — — 6 — — Included in earnings: Net Realized Gains/Losses — — — (1 ) 11 (1 ) (104 ) Other income (expense) — — — — 18 — — Purchases 8 8 23 1 52 — — Sales — (2 ) — — (25 ) — — Settlements — (15 ) (1 ) — (172 ) — — Balance–End of Period $ 56 $ 167 $ 55 $ 2 $ 2,679 $ 3 $ 347 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ — $ — $ (1 ) $ — $ (1 ) $ (104 ) (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 liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information. Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity Other GLB (1) June 30, 2014 Foreign Corporate MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 26 $ 151 $ 8 $ 2 $ 2,611 $ 243 Transfers into Level 3 2 26 — — — — Transfers out of Level 3 (16 ) — — — — — Change in Net Unrealized Gains (Losses) included in OCI — 2 — — 7 — Included in earnings: Net Realized Gains/Losses 1 — — — (3 ) (2 ) Other income (expense) — — — — 43 — Purchases — 30 — — 109 — Sales (1 ) (2 ) — — (2 ) — Settlements — (3 ) (1 ) — (125 ) — Balance–End of Period $ 12 $ 204 $ 7 $ 2 $ 2,640 $ 241 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ — $ — $ — $ (3 ) $ (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 liability classified as Future policy benefits in the consolidated balance sheets. The liability for GLB reinsurance was $486 million at June 30, 2014 , and $483 million at March 31, 2014, which includes a fair value derivative adjustment of $241 million and $243 million, respectively. Assets Liabilities Six Months Ended Available-for-Sale Debt Securities Equity Other Other GLB (1) June 30, 2015 Foreign Corporate MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 22 $ 187 $ 15 $ 2 $ 2,719 4 $ 406 Transfers into Level 3 28 13 — — — — — Transfers out of Level 3 — — — — — — — Change in Net Unrealized Gains (Losses) included in OCI (2 ) — — — (14 ) — — Included in earnings: Net Realized Gains/Losses — (3 ) — (1 ) 11 (1 ) (59 ) Other income (expense) — — — — 40 — — Purchases 9 16 41 1 177 — — Sales (1 ) (5 ) — — (25 ) — — Settlements — (41 ) (1 ) — (229 ) — — Balance–End of Period $ 56 $ 167 $ 55 $ 2 $ 2,679 $ 3 $ 347 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ (2 ) $ — $ (1 ) $ — $ (1 ) $ (59 ) (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 liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information. Assets Liabilities Six Months Ended Available-for-Sale Debt Securities Short-term investments Other investments GLB (1) June 30, 2014 Foreign Corporate MBS Equity (in millions of U.S. dollars) Balance–Beginning of Period $ 44 $ 166 $ 8 $ 4 $ 7 $ 2,440 $ 193 Transfers into Level 3 2 30 — — — — — Transfers out of Level 3 (34 ) (22 ) — (2 ) (7 ) — — Change in Net Unrealized Gains (Losses) included in OCI (1 ) 2 — 1 — 48 — Included in earnings: Net Realized Gains/Losses 1 — — — — (3 ) 48 Other income (expense) — — — — — 104 — Purchases 2 45 — 1 — 248 — Sales (2 ) (8 ) — (2 ) — (3 ) — Settlements — (9 ) (1 ) — — (194 ) — Balance–End of Period $ 12 $ 204 $ 7 $ 2 $ — $ 2,640 $ 241 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ — $ — $ — $ — $ (3 ) $ 48 (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 liability classified as Future policy benefits in the consolidated balance sheets. The liability for GLB reinsurance was $486 million at June 30, 2014 and $427 million at December 31, 2013, which includes a fair value derivative adjustment of $241 million and $193 million , respectively. b) Financial instruments disclosed, but not measured, at fair value ACE 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 ACE’s share of the net assets based on the financial statements provided by those companies. Short- and long-term debt and trust preferred securities Where practical, fair values for short-term debt, long-term debt, and trust preferred securities are estimated using discounted cash flow calculations based principally on observable inputs including incremental borrowing rates, which reflect ACE’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: June 30, 2015 Fair Value Carrying Value (in millions of U.S. dollars) Level 1 Level 2 Level 3 Total Assets: Fixed maturities held to maturity U.S. Treasury and agency $ 583 $ 175 $ — $ 758 $ 743 Foreign — 843 — 843 808 Corporate securities — 3,115 14 3,129 3,113 Mortgage-backed securities — 1,877 — 1,877 1,828 States, municipalities, and political subdivisions — 2,198 — 2,198 2,184 583 8,208 14 8,805 8,676 Partially-owned insurance companies — — 638 638 638 Total assets $ 583 $ 8,208 $ 652 $ 9,443 $ 9,314 Liabilities: Short-term debt $ — $ 2,107 $ — $ 2,107 $ 2,102 Long-term debt — 4,383 — 4,383 4,157 Trust preferred securities — 457 — 457 309 Total liabilities $ — $ 6,947 $ — $ 6,947 $ 6,568 December 31, 2014 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 $ 659 $ 191 $ — $ 850 $ 832 Foreign — 963 — 963 916 Corporate securities — 2,408 15 2,423 2,323 Mortgage-backed securities — 2,039 — 2,039 1,983 States, municipalities, and political subdivisions — 1,314 — 1,314 1,277 659 6,915 15 7,589 7,331 Partially-owned insurance companies — — 504 504 504 Total assets $ 659 $ 6,915 $ 519 $ 8,093 $ 7,835 Liabilities: Short-term debt $ — $ 2,571 $ — $ 2,571 $ 2,552 Long-term debt — 3,690 — 3,690 3,357 Trust preferred securities — 462 — 462 309 Total liabilities $ — $ 6,723 $ — $ 6,723 $ 6,218

Assumed life reinsurance progra

Assumed life reinsurance programs involving minimum benefit guarantees under annuity contracts	6 Months Ended
	Jun. 30, 2015
Reinsurance Disclosures [Abstract]
Assumed life reinsurance programs involving minimum benefit guarantees under annuity contracts	Assumed life reinsurance programs involving minimum benefit guarantees under variable annuity contracts The following table presents income and expenses relating to GMDB and GLB reinsurance. GLBs include GMIBs as well as some GMABs originating in Japan. Three Months Ended Six Months Ended June 30 June 30 (in millions of U.S. dollars) 2015 2014 2015 2014 GMDB Net premiums earned $ 16 $ 18 $ 32 $ 37 Policy benefits and other reserve adjustments $ 11 $ 13 $ 20 $ 28 GLB Net premiums earned $ 30 $ 34 $ 62 $ 70 Policy benefits and other reserve adjustments 7 10 19 19 Net realized gains (losses) 104 2 59 (48 ) Gain recognized in Net income $ 127 $ 26 $ 102 $ 3 Less: Net cash received 26 29 54 62 Net (increase) decrease in liability $ 101 $ (3 ) $ 48 $ (59 ) Net realized gains (losses) in the table above include gains (losses) related to foreign exchange and fair value adjustments on insurance derivatives and exclude gains (losses) on S&P put options and futures held to partially offset the risk in the GLB reinsurance portfolio. Refer to Note 7 for additional information. At June 30, 2015 and December 31, 2014, the reported liability for GMDB reinsurance was $114 million and $111 million , respectively. At June 30, 2015 and December 31, 2014, the reported liability for GLB reinsurance was $615 million and $663 million, respectively, which includes a fair value derivative adjustment of $ 347 million and $406 million, respectively. Reported liabilities for both GMDB and GLB reinsurance are determined using internal valuation models. Such valuations require considerable judgment and are subject to significant uncertainty. The valuation of these products is subject to fluctuations arising from, among other factors, changes in interest rates, changes in equity markets, changes in credit markets, changes in the allocation of the investments underlying annuitants’ account values, and assumptions regarding future policyholder behavior. These models and the related assumptions are regularly reviewed by management and enhanced, as appropriate, based upon improvements in modeling assumptions and availability of updated information, such as market conditions and demographics of in-force annuities.

Debt

Debt	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Debt In March 2015, ACE INA Holdings Inc. issued $800 million of 3.15 percent senior notes due March 2025. These senior notes are redeemable at any time at ACE INA Holdings Inc.'s option subject to a “make-whole” premium (the present value of the remaining principal and interest discounted at the applicable U.S. Treasury rate plus 0.15 percent). The notes are also redeemable at par plus accrued and unpaid interest in the event of certain changes in tax law. These notes do not have the benefit of any sinking fund. These senior unsecured notes are guaranteed on a senior basis by ACE Limited and they rank equally with all of ACE's other senior obligations. They also contain customary limitations on lien provisions as well as customary events of default provisions which, if breached, could result in the accelerated maturity of such senior debt. In May 2015, ACE INA Holdings Inc.'s $450 million of 5.6 percent senior notes matured and were fully paid.

Commitments, contingencies, and

Commitments, contingencies, and guarantees	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments, contingencies, and guarantees	Commitments, contingencies, and guarantees a) Derivative instruments Foreign currency management As a global company, ACE 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-USD capital positions, however we do consider hedging for planned cross border transactions. Derivative instruments employed ACE 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. ACE 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, ACE from time to time purchases to be announced mortgage-backed securities (TBAs) as part of its investing activities. Under reinsurance programs covering GLBs, ACE 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. ACE also maintains positions in exchange-traded equity futures contracts and options on equity market indices to limit equity exposure in the GMDB and GLB blocks of business. 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: June 30, 2015 December 31, 2014 Consolidated Balance Sheet Location Fair Value Notional Value/ Payment Provision Fair Value Notional Value/ Payment Provision (in millions of U.S. dollars) Derivative Asset Derivative (Liability) Derivative Asset Derivative (Liability) Investment and embedded derivative instruments Foreign currency forward contracts OA / (AP) $ 6 $ (13 ) $ 1,309 $ 12 $ (7 ) $ 1,329 Cross-currency swaps OA / (AP) — — 95 — — 95 Futures contracts on money market instruments OA / (AP) 1 (1 ) 4,355 — — 2,467 Options/Futures contracts on notes and bonds OA / (AP) 9 (1 ) 920 6 (29 ) 1,636 Convertible securities (1) FM AFS / ES 292 — 277 291 — 267 $ 308 $ (15 ) $ 6,956 $ 309 $ (36 ) $ 5,794 Other derivative instruments Futures contracts on equities (2) OA / (AP) $ 16 $ — $ 1,286 $ — $ (21 ) $ 1,384 Options on equity market indices (2) OA / (AP) — — 250 2 — 250 Other OA / (AP) 7 (3 ) 401 — (4 ) 10 $ 23 $ (3 ) $ 1,937 $ 2 $ (25 ) $ 1,644 GLB (3) (AP) / (FPB) $ — $ (615 ) $ 786 $ — $ (663 ) $ 675 (1) Includes fair value of embedded derivatives. (2) Related to GMDB and GLB blocks of business. (3) Includes both future policy benefits reserves and fair value derivative adjustment. Refer to Note 5 for additional information. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts. At June 30, 2015 and December 31, 2014, derivative liabilities of $19 million and $34 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 ACE participates in a securities lending program operated by a third-party banking institution whereby certain assets are loaned to qualified borrowers and from which we earn an incremental return. At June 30, 2015 and December 31, 2014, our securities lending collateral was $1,080 million and $1,330 million, respectively, and our securities lending payable, reflecting our obligation to return the collateral plus interest, was $1,081 million and $1,331 million, respectively. At June 30, 2015 the securities lending collateral held by ACE on overnight and continuous securities lending contracts comprised $526 million of Cash, $477 million of Foreign securities, $74 million of U.S. Treasury and agency securities and $3 million of Corporate securities. The carrying value of the securities lending collateral held is $1 million lower than the securities lending payable due to accrued interest recorded in the securities lending payable. The securities lending collateral can only be drawn down by ACE 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. At both June 30, 2015 and December 31, 2014, our repurchase agreement obligations of $1,402 million 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 Short-term debt in the consolidated balance sheets. The following table presents the carrying value of collateral pledged under repurchase agreements by investment category and maturity date of the underlying agreements: Remaining contractual maturity June 30, 2015 30 - 90 Days Greater than 90 Days Total (in millions of U.S. dollars) Collateral pledged under repurchase agreements: Cash $ — $ 5 $ 5 U.S. Treasury and agency 62 176 238 Mortgage-backed securities 86 1,129 1,215 $ 148 $ 1,310 $ 1,458 Gross amount of recognized liabilities for repurchase agreements $ 1,402 Difference (1) $ 56 (1) Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability. Potential risks exist in our secured borrowing transactions due to market conditions and counterparty exposure. With collateral that we pledge, there is a risk that the collateral may not be returned at the expiration of the agreement. If the counterparty fails to return the collateral, ACE will have free use of the borrowed funds until our collateral is returned. In addition, we may encounter the risk that ACE 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, ACE may seek alternative borrowing sources or reduce borrowings. Additionally, increased margins and collateral requirements due to market conditions would increase our restricted assets as we are required to provide additional collateral to support the transaction. The following table presents net realized gains (losses) related to derivative instrument activity in the consolidated statements of operations: Three Months Ended Six Months Ended June 30 June 30 (in millions of U.S. dollars) 2015 2014 2015 2014 Investment and embedded derivative instruments Foreign currency forward contracts $ (10 ) $ (1 ) $ 15 $ (4 ) All other futures contracts and options 42 (18 ) 13 (40 ) Convertible securities (1) (5 ) 4 — 4 Total investment and embedded derivative instruments $ 27 $ (15 ) $ 28 $ (40 ) GLB and other derivative instruments GLB (2) $ 104 $ 2 $ 59 $ (46 ) Futures contracts on equities (3) (2 ) (71 ) (13 ) (88 ) Options on equity market indices (3) — (1 ) (1 ) (3 ) Other (1 ) 9 (1 ) 7 Total GLB and other derivative instruments $ 101 $ (61 ) $ 44 $ (130 ) $ 128 $ (76 ) $ 72 $ (170 ) (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. ACE uses forwards to minimize the effect of fluctuating foreign currencies as discussed above. (ii) Duration management and market exposure Futures Futures contracts give the holder the right and obligation to participate in market movements, determined by the index or underlying security on which the futures contract is based. Settlement is made daily in cash by an amount equal to the change in value of the futures contract times a multiplier that scales the size of the contract. Exchange-traded futures contracts on money market instruments, notes and bonds are used in fixed maturity portfolios to more efficiently manage duration, as substitutes for ownership of the money market instruments, bonds and notes without significantly increasing the risk in the portfolio. Investments in futures contracts may be made only to the extent that there are assets under management not otherwise committed. Exchange-traded equity futures contracts are used to limit exposure to a severe equity market decline, which would cause an increase in expected claims and therefore, an increase in reserves for GMDB and GLB reinsurance business. Options An option contract conveys to the holder the right, but not the obligation, to purchase or sell a specified amount or value of an underlying security at a fixed price. Option contracts are used in the investment portfolio as protection against unexpected shifts in interest rates, which would affect the duration of the fixed maturity portfolio. By using options in the portfolio, the overall interest rate sensitivity of the portfolio can be reduced. Option contracts may also be used as an alternative to futures contracts in the synthetic strategy as described above. Another use for option contracts is to limit exposure to a severe equity market decline, which would cause an increase in expected claims and therefore, an increase in reserves for GMDB and GLB reinsurance business. The price of an option is influenced by the underlying security, expected volatility, time to expiration, and supply and demand. The credit risk associated with the above derivative financial instruments relates to the potential for non-performance by counterparties. Although non-performance is not anticipated, in order to minimize the risk of loss, management monitors the creditworthiness of its counterparties and obtains collateral. The performance of exchange-traded instruments is guaranteed by the exchange on which they trade. For non-exchange-traded instruments, the counterparties are principally banks which must meet certain criteria according to our investment guidelines. Cross-currency swaps Cross-currency swaps are agreements under which two counterparties exchange interest payments and principal denominated in different currencies at a future date. We use cross-currency swaps to reduce the foreign currency and interest rate risk by converting cash flows back into local currency. We invest in foreign currency denominated investments to improve credit diversification and also to obtain better duration matching to our liabilities that is limited in the local currency market. Other Included within Other are derivatives intended to reduce potential losses which may arise from certain exposures in our insurance business. The economic benefit provided by these derivatives is similar to purchased reinsurance. For example, ACE 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. ACE 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. ACE 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, ACE 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) Other investments At June 30, 2015 , included in Other investments in the consolidated balance sheet are investments in limited partnerships and partially-owned investment companies with a carrying value of $2.2 billion. In connection with these investments, we have commitments that may require funding of up to $1.0 billion over the next several years. e) Taxation At June 30, 2015 , $23 million of unrecognized tax benefits remains outstanding. It is reasonably possible that over the next twelve months, the amount of unrecognized tax benefits may change resulting from the re-evaluation of unrecognized tax benefits arising from examinations of taxing authorities. With few exceptions, ACE is no longer subject to state and local or non-U.S. income tax examinations for years before 2005. f) 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	6 Months Ended
	Jun. 30, 2015
Stockholders' Equity Note [Abstract]
Shareholders' equity	Shareholders’ equity All of ACE’s Common Shares are authorized under Swiss corporate law. Though the par value of Common Shares is stated in Swiss francs, ACE 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 ACE in U.S. dollars. At our May 2013 annual general meeting, our shareholders approved an annual dividend for the following year of $2.04 per share, payable in four quarterly installments of $ 0.51 per share after the annual general meeting in the form of a distribution by way of a par value reduction. At the January 10, 2014 extraordinary general meeting, our shareholders approved a resolution to increase our quarterly dividend from $ 0.51 per share to $0.63 per share for the final two quarterly installments (made on January 31, 2014 and April 17, 2014) that had been earlier approved at our 2013 annual general meeting. The $0.12 per share increase for each installment was distributed from capital contribution reserves (Additional paid-in capital), a subaccount of legal reserves, and transferred to free reserves (Retained earnings) for payment, while the existing $0.51 per share was distributed by way of a par value reduction. At our May 2014 annual general meeting, our shareholders approved an annual dividend for the following year of $2.60 per share, payable in four quarterly installments of $0.65 per share after the annual general meeting in the form of a distribution by way of a par value reduction. At our May 2015 annual general meeting, our shareholders approved an annual dividend for the following year of up to $ 2.68 per share, expected to be paid in four quarterly installments of $ 0.67 per share after the annual general meeting. This dividend will be distributed from capital contribution reserves and transferred to free reserves for payment. The Board of Directors (Board) will determine the record and payment dates at which the annual dividend may be paid, and is authorized to abstain (in whole or in part) from distributing a dividend in its discretion, until the date of the 2016 annual general meeting. The following table presents dividend distributions per Common Share in Swiss francs (CHF) and U.S. dollars (USD): Three Months Ended Six Months Ended June 30 June 30 2015 2014 2015 2014 CHF USD CHF USD CHF USD CHF USD Dividends – par value reduction — $ 0.58 $ 0.65 0.62 $ 0.65 1.03 $ 1.16 Dividends – distributed from capital contribution reserves 0.62 0.67 — — 0.62 0.67 0.20 0.24 Total dividend distributions per common share 0.62 $ 0.67 0.58 $ 0.65 1.24 $ 1.32 1.23 $ 1.40 Par value reductions have been reflected as such through Common Shares in the consolidated statements of shareholders' equity and had the effect of reducing par value per Common Share to CHF 24.15 at June 30, 2015 . 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 June 30, 2015 , 19,018,131 Common Shares remain in treasury after net shares redeemed under employee share-based compensation plans. ACE Limited securities repurchase authorization In November 2014, the Board announced authorization of a share repurchase program of $1.5 billion of ACE's Common Shares for the period January 1, 2015 through December 31, 2015 to replace the November 2013 authorization when it expired on December 31, 2014. In November 2013, the Board announced authorization of a share repurchase program of up to $ 2.0 billion of ACE's Common Shares through December 31, 2014. The following table presents repurchases of ACE's Common Shares conducted in a series of open market transactions under the Board authorizations: (in millions of U.S. dollars, except share data) Three Months Ended June 30 Six Months Ended June 30 2015 2014 2015 2014 Number of shares repurchased 3,650,200 2,306,000 6,677,663 5,793,882 Cost of shares repurchased $ 394 $ 237 $ 734 $ 569 Repurchase authorization remaining at end of period $ 766 $ 1,374 $ 766 $ 1,374

Share-based compensation

Share-based compensation	6 Months Ended
	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation	Share-based compensation The ACE Limited 2004 Long-Term Incentive Plan (the 2004 LTIP) permits grants of both incentive and non-qualified stock options principally at an option price per share equal to the grant date fair value of ACE’s Common Shares. Stock options are generally granted with a 3-year vesting period and a 10-year term. Stock options typically vest in equal annual installments over the vesting period, which is also the requisite service period. On February 26, 2015 , ACE granted 1,891,195 stock options with a weighted-average grant date fair value of $18.49 each. The fair value of the options issued is estimated on the grant date using the Black-Scholes option pricing model. The 2004 LTIP also permits grants of restricted stock and restricted stock units. ACE generally grants restricted stock and restricted stock units with a 4-year vesting period, based on a graded vesting schedule. The restricted stock is granted at market close price on the grant date. On February 26, 2015 , ACE granted 1,278,250 restricted stock awards and 290,475 restricted stock units to employees and officers with a grant date fair value of $114.78 each. Each restricted stock unit represents our obligation to deliver to the holder one Common Share upon vesting.

Segment information

Segment information	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Segment information	Segment information ACE operates through five business segments: Insurance – North American P&C, Insurance – North American Agriculture, Insurance – Overseas General, Global Reinsurance, and Life. These segments distribute their products through various forms of brokers, agencies, and direct marketing programs. All business segments have established relationships with reinsurance intermediaries. Corporate includes the results of ACE’s non-insurance subsidiaries, including ACE Limited, ACE Group Management and Holdings Ltd., and ACE INA Holdings, Inc. Corporate results consist primarily of interest expense, corporate staff expenses and other expenses not attributable to specific reportable segments, and intersegment eliminations. For segment reporting purposes, certain items have been presented in a different manner below than in the consolidated financial statements. Management uses underwriting income as the main measure of segment performance. ACE calculates underwriting income by subtracting Losses and loss expenses, Policy benefits, Policy acquisition costs, and Administrative expenses from Net premiums earned. For the Insurance – North American Agriculture segment, management includes gains and losses on crop derivatives as a component of underwriting income. For example, for the three months ended June 30, 2015 , underwriting income in our Insurance – North American Agriculture segment was $21 million . This amount includes $2 million of realized losses related to crop derivatives which are included in Net realized gains (losses) below. For the Life 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 underwriting income. For example, for the three months ended June 30, 2015 , Life underwriting income of $ 77 million includes Net investment income of $ 66 million and gains from fair value changes in separate account assets of $ 6 million. The following tables present the Statement of Operations by segment: For the Three Months Ended June 30, 2015 Insurance – North American P&C Insurance – North American Agriculture Insurance – Overseas General Global Reinsurance Life Corporate ACE Consolidated (in millions of U.S. dollars) Net premiums written $ 1,975 $ 379 $ 1,669 $ 261 $ 500 $ — $ 4,784 Net premiums earned 1,688 321 1,644 220 487 — 4,360 Losses and loss expenses 1,120 271 816 72 137 1 2,417 Policy benefits — — — — 153 — 153 Policy acquisition costs 130 23 396 60 118 — 727 Administrative expenses 189 4 254 13 74 44 578 Underwriting income (loss) 249 23 178 75 5 (45 ) 485 Net investment income 269 6 139 79 66 3 562 Net realized gains (losses) including OTTI — (2 ) 13 5 103 7 126 Interest expense 2 — 1 1 2 65 71 Other (income) expense: (Gains) losses from fair value changes in separate account assets — — — — (6 ) — (6 ) Other 23 8 8 (3 ) (17 ) 4 23 Income tax expense (benefit) 89 4 69 7 10 (36 ) 143 Net income (loss) $ 404 $ 15 $ 252 $ 154 $ 185 $ (68 ) $ 942 For the Three Months Ended June 30, 2014 Insurance – North American P&C Insurance – North American Agriculture Insurance – Overseas General Global Reinsurance Life Corporate ACE Consolidated (in millions of U.S. dollars) Net premiums written $ 1,635 $ 388 $ 1,760 $ 278 $ 498 $ — $ 4,559 Net premiums earned 1,542 330 1,709 261 490 — 4,332 Losses and loss expenses 1,016 287 830 109 146 — 2,388 Policy benefits — — — — 144 — 144 Policy acquisition costs 152 23 402 60 121 — 758 Administrative expenses 175 1 256 14 73 47 566 Underwriting income (loss) 199 19 221 78 6 (47 ) 476 Net investment income 265 6 136 80 66 3 556 Net realized gains (losses) including OTTI (11 ) 8 14 (15 ) (72 ) 3 (73 ) Interest expense 2 — 1 2 3 64 72 Other (income) expense: (Gains) losses from fair value changes in separate account assets — — — — (17 ) — (17 ) Other (24 ) 9 8 (10 ) 4 5 (8 ) Income tax expense (benefit) 91 5 55 10 12 (40 ) 133 Net income (loss) $ 384 $ 19 $ 307 $ 141 $ (2 ) $ (70 ) $ 779 For the Six Months Ended June 30, 2015 Insurance – North American P&C Insurance – North American Agriculture Insurance – Overseas General Global Reinsurance Life Corporate ACE Consolidated (in millions of U.S. dollars) Net premiums written $ 3,405 $ 467 $ 3,463 $ 534 $ 991 $ — $ 8,860 Net premiums earned 3,214 385 3,281 446 961 — 8,287 Losses and loss expenses 2,155 293 1,630 171 289 1 4,539 Policy benefits — — — — 295 — 295 Policy acquisition costs 291 19 785 114 225 — 1,434 Administrative expenses 360 3 510 25 147 87 1,132 Underwriting income (loss) 408 70 356 136 5 (88 ) 887 Net investment income 532 12 277 154 132 6 1,113 Net realized gains (losses) including OTTI (6 ) (2 ) 3 (6 ) 44 4 37 Interest expense 4 — 2 2 3 128 139 Other (income) expense: (Gains) losses from fair value changes in separate account assets — — — — (17 ) — (17 ) Other 16 16 25 (8 ) (29 ) 9 29 Income tax expense (benefit) 169 14 121 15 19 (75 ) 263 Net income (loss) $ 745 $ 50 $ 488 $ 275 $ 205 $ (140 ) $ 1,623 For the Six Months Ended June 30, 2014 Insurance – North American P&C Insurance – North American Agriculture Insurance – Overseas General Global Reinsurance Life Corporate ACE Consolidated (in millions of U.S. dollars) Net premiums written $ 3,053 $ 582 $ 3,531 $ 586 $ 992 $ — $ 8,744 Net premiums earned 3,029 433 3,321 545 974 — 8,302 Losses and loss expenses 1,956 413 1,647 235 297 1 4,549 Policy benefits — — — — 258 — 258 Policy acquisition costs 311 28 788 127 232 — 1,486 Administrative expenses 336 2 506 28 141 88 1,101 Underwriting income (loss) 426 (10 ) 380 155 46 (89 ) 908 Net investment income 535 13 268 157 130 6 1,109 Net realized gains (losses) including OTTI (20 ) 6 4 (23 ) (148 ) 4 (177 ) Interest expense 5 — 2 3 6 127 143 Other (income) expense: (Gains) losses from fair value changes in separate account assets — — — — (11 ) — (11 ) Other (44 ) 17 2 (29 ) 11 12 (31 ) Income tax expense (benefit) 174 (2 ) 92 20 22 (80 ) 226 Net income (loss) $ 806 $ (6 ) $ 556 $ 295 $ — $ (138 ) $ 1,513 Underwriting assets are reviewed in total by management for purposes of decision-making. Other than goodwill and other intangible assets, ACE does not allocate assets to its segments. The following table presents net premiums earned for each segment by product: (in millions of U.S. dollars) Property & All Other Casualty Life, Accident & Health ACE Consolidated For the Three Months Ended June 30, 2015 Insurance – North American P&C $ 507 $ 1,079 $ 102 $ 1,688 Insurance – North American Agriculture 321 — — 321 Insurance – Overseas General 729 391 524 1,644 Global Reinsurance 102 118 — 220 Life — — 487 487 $ 1,659 $ 1,588 $ 1,113 $ 4,360 For the Three Months Ended June 30, 2014 Insurance – North American P&C $ 423 $ 1,018 $ 101 $ 1,542 Insurance – North American Agriculture 330 — — 330 Insurance – Overseas General 727 395 587 1,709 Global Reinsurance 132 129 — 261 Life — — 490 490 $ 1,612 $ 1,542 $ 1,178 $ 4,332 (in millions of U.S. dollars) Property & Casualty Life, ACE For the Six Months Ended June 30, 2015 Insurance – North American P&C $ 917 $ 2,094 $ 203 $ 3,214 Insurance – North American Agriculture 385 — — 385 Insurance – Overseas General 1,457 773 1,051 3,281 Global Reinsurance 219 227 — 446 Life — — 961 961 $ 2,978 $ 3,094 $ 2,215 $ 8,287 For the Six Months Ended June 30, 2014 Insurance – North American P&C $ 828 $ 1,999 $ 202 $ 3,029 Insurance – North American Agriculture 433 — — 433 Insurance – Overseas General 1,420 764 1,137 3,321 Global Reinsurance 286 259 — 545 Life — — 974 974 $ 2,967 $ 3,022 $ 2,313 $ 8,302

Earnings per share

Earnings per share	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Earnings per share	Earnings per share Three Months Ended Six Months Ended June 30 June 30 (in millions of U.S. dollars, except share and per share data) 2015 2014 2015 2014 Numerator: Net income $ 942 $ 779 $ 1,623 $ 1,513 Denominator: Denominator for basic earnings per share: Weighted-average shares outstanding 325,463,196 337,846,228 326,795,838 338,353,260 Denominator for diluted earnings per share: Share-based compensation plans 3,222,562 3,286,359 3,373,809 3,267,499 Weighted-average shares outstanding and assumed conversions 328,685,758 341,132,587 330,169,647 341,620,759 Basic earnings per share $ 2.89 $ 2.30 $ 4.97 $ 4.47 Diluted earnings per share $ 2.86 $ 2.28 $ 4.91 $ 4.43 Potential anti-dilutive share conversions 1,934,454 1,778,040 1,306,817 1,220,731 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	6 Months Ended
	Jun. 30, 2015
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 June 30, 2015 and December 31, 2014 , and for the three and six months ended June 30, 2015 and 2014 for ACE Limited (Parent Guarantor) and ACE 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 ACE Limited Subsidiaries column on a combined basis. Condensed Consolidating Balance Sheet at June 30, 2015 (in millions of U.S. dollars) ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated Assets Investments $ 32 $ 35 $ 63,198 $ — $ 63,265 Cash (1) 1 3 1,209 (423 ) 790 Insurance and reinsurance balances receivable — — 6,726 (969 ) 5,757 Reinsurance recoverable on losses and loss expenses — — 20,619 (8,844 ) 11,775 Reinsurance recoverable on policy benefits — — 1,192 (989 ) 203 Value of business acquired — — 434 — 434 Goodwill and other intangible assets — — 5,969 — 5,969 Investments in subsidiaries 29,806 18,747 — (48,553 ) — Due from subsidiaries and affiliates, net 370 — — (370 ) — Other assets 5 381 15,026 (3,765 ) 11,647 Total assets $ 30,214 $ 19,166 $ 114,373 $ (63,913 ) $ 99,840 Liabilities Unpaid losses and loss expenses $ — $ — $ 46,596 $ (8,366 ) $ 38,230 Unearned premiums — — 10,718 (1,839 ) 8,879 Future policy benefits — — 5,824 (989 ) 4,835 Due to subsidiaries and affiliates, net — 245 125 (370 ) — Affiliated notional cash pooling programs (1) 386 37 — (423 ) — Short-term debt — 700 1,402 — 2,102 Long-term debt — 4,145 12 — 4,157 Trust preferred securities — 309 — — 309 Other liabilities 273 1,499 13,374 (3,373 ) 11,773 Total liabilities 659 6,935 78,051 (15,360 ) 70,285 Total shareholders’ equity 29,555 12,231 36,322 (48,553 ) 29,555 Total liabilities and shareholders’ equity $ 30,214 $ 19,166 $ 114,373 $ (63,913 ) $ 99,840 (1) ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015 , the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Balance Sheet at December 31, 2014 (in millions of U.S. dollars) ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated Assets Investments $ 30 $ 225 $ 62,649 $ — $ 62,904 Cash (1) — 1 1,209 (555 ) 655 Insurance and reinsurance balances receivable — — 6,178 (752 ) 5,426 Reinsurance recoverable on losses and loss expenses — — 20,992 (9,000 ) 11,992 Reinsurance recoverable on policy benefits — — 1,194 (977 ) 217 Value of business acquired — — 466 — 466 Goodwill and other intangible assets — — 5,724 — 5,724 Investments in subsidiaries 29,497 18,762 — (48,259 ) — Due from subsidiaries and affiliates, net 583 — — (583 ) — Other assets 4 295 14,196 (3,631 ) 10,864 Total assets $ 30,114 $ 19,283 $ 112,608 $ (63,757 ) $ 98,248 Liabilities Unpaid losses and loss expenses $ — $ — $ 46,770 $ (8,455 ) $ 38,315 Unearned premiums — — 9,958 (1,736 ) 8,222 Future policy benefits — — 5,731 (977 ) 4,754 Due to subsidiaries and affiliates, net — 422 161 (583 ) — Affiliated notional cash pooling programs (1) 246 309 — (555 ) — Short-term debt — 1,150 1,402 — 2,552 Long-term debt — 3,345 12 — 3,357 Trust preferred securities — 309 — — 309 Other liabilities 281 1,404 12,659 (3,192 ) 11,152 Total liabilities 527 6,939 76,693 (15,498 ) 68,661 Total shareholders’ equity 29,587 12,344 35,915 (48,259 ) 29,587 Total liabilities and shareholders’ equity $ 30,114 $ 19,283 $ 112,608 $ (63,757 ) $ 98,248 (1) ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2014 , 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 June 30, 2015 ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 4,784 $ — $ 4,784 Net premiums earned — — 4,360 — 4,360 Net investment income — — 562 — 562 Equity in earnings of subsidiaries 901 296 — (1,197 ) — Net realized gains (losses) including OTTI — (2 ) 128 — 126 Losses and loss expenses — — 2,417 — 2,417 Policy benefits — — 153 — 153 Policy acquisition costs and administrative expenses 18 7 1,280 — 1,305 Interest (income) expense (7 ) 69 9 — 71 Other (income) expense (57 ) (4 ) 78 — 17 Income tax expense (benefit) 5 (27 ) 165 — 143 Net income $ 942 $ 249 $ 948 $ (1,197 ) $ 942 Comprehensive income (loss) $ 397 $ (91 ) $ 403 $ (312 ) $ 397 Condensed Consolidating Statements of Operations and Comprehensive Income For the Three Months Ended June 30, 2014 ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 4,559 $ — $ 4,559 Net premiums earned — — 4,332 — 4,332 Net investment income 1 1 554 — 556 Equity in earnings of subsidiaries 745 231 — (976 ) — Net realized gains (losses) including OTTI — 8 (81 ) — (73 ) Losses and loss expenses — — 2,388 — 2,388 Policy benefits — — 144 — 144 Policy acquisition costs and administrative expenses 22 8 1,294 — 1,324 Interest (income) expense (9 ) 70 11 — 72 Other (income) expense (50 ) 6 19 — (25 ) Income tax expense (benefit) 4 (25 ) 154 — 133 Net income $ 779 $ 181 $ 795 $ (976 ) $ 779 Comprehensive income $ 1,348 $ 511 $ 1,364 $ (1,875 ) $ 1,348 Condensed Consolidating Statements of Operations and Comprehensive Income For the Six Months Ended June 30, 2015 ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 8,860 $ — $ 8,860 Net premiums earned — — 8,287 — 8,287 Net investment income 1 1 1,111 — 1,113 Equity in earnings of subsidiaries 1,549 500 — (2,049 ) — Net realized gains (losses) including OTTI — (2 ) 39 — 37 Losses and loss expenses — — 4,539 — 4,539 Policy benefits — — 295 — 295 Policy acquisition costs and administrative expenses 32 13 2,521 — 2,566 Interest (income) expense (15 ) 138 16 — 139 Other (income) expense (98 ) (7 ) 117 — 12 Income tax expense (benefit) 8 (53 ) 308 — 263 Net income $ 1,623 $ 408 $ 1,641 $ (2,049 ) $ 1,623 Comprehensive income (loss) $ 1,039 $ (67 ) $ 1,057 $ (990 ) $ 1,039 Condensed Consolidating Statements of Operations and Comprehensive Income For the Six Months Ended June 30, 2014 ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 8,744 $ — $ 8,744 Net premiums earned — — 8,302 — 8,302 Net investment income 1 1 1,107 — 1,109 Equity in earnings of subsidiaries 1,447 411 — (1,858 ) — Net realized gains (losses) including OTTI — 7 (184 ) — (177 ) Losses and loss expenses — — 4,549 — 4,549 Policy benefits — — 258 — 258 Policy acquisition costs and administrative expenses 39 14 2,534 — 2,587 Interest (income) expense (19 ) 141 21 — 143 Other (income) expense (92 ) 20 30 — (42 ) Income tax expense (benefit) 7 (55 ) 274 — 226 Net income $ 1,513 $ 299 $ 1,559 $ (1,858 ) $ 1,513 Comprehensive income $ 2,456 $ 777 $ 2,502 $ (3,279 ) $ 2,456 Condensed Consolidating Statement of Cash Flows For the Six Months Ended June 30, 2015 ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Consolidating Adjustments and Eliminations ACE Limited Consolidated (in millions of U.S. dollars) Net cash flows from (used for) operating activities $ 65 $ (35 ) $ 1,861 $ — $ 1,891 Cash flows from investing activities Purchases of fixed maturities available for sale — — (9,210 ) — (9,210 ) Purchases of fixed maturities held to maturity — — (24 ) — (24 ) Purchases of equity securities — — (70 ) — (70 ) Sales of fixed maturities available for sale — — 3,642 — 3,642 Sales of equity securities — — 102 — 102 Maturities and redemptions of fixed maturities available for sale — — 3,691 — 3,691 Maturities and redemptions of fixed maturities held to maturity — — 470 — 470 Net change in short-term investments — 190 38 — 228 Net derivative instruments settlements — (9 ) (24 ) — (33 ) Acquisition of subsidiaries (net of cash acquired of $620) — — 255 — 255 Other — (2 ) (69 ) — (71 ) Net cash flows from (used for) investing activities — 179 (1,199 ) — (1,020 ) Cash flows from financing activities Dividends paid on Common Shares (427 ) — — — (427 ) Common Shares repurchased — — (750 ) — (750 ) Proceeds from issuance of long-term debt — 800 — — 800 Proceeds from issuance of short-term debt — — 1,327 — 1,327 Repayment of long-term debt — (450 ) — — (450 ) Repayment of short-term debt — — (1,327 ) — (1,327 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 46 — 46 Advances (to) from affiliates 223 (214 ) (9 ) — — Net payments to affiliated notional cash pooling programs (1) 140 (272 ) — 132 — Policyholder contract deposits — — 235 — 235 Policyholder contract withdrawals — — (107 ) — (107 ) Other — (6 ) — — (6 ) Net cash flows used for financing activities (64 ) (142 ) (585 ) 132 (659 ) Effect of foreign currency rate changes on cash and cash equivalents — — (77 ) — (77 ) Net increase in cash 1 2 — 132 135 Cash – beginning of period (1) — 1 1,209 (555 ) 655 Cash – end of period (1) $ 1 $ 3 $ 1,209 $ (423 ) $ 790 (1) ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Statement of Cash Flows For the Six Months Ended June 30, 2014 ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated (in millions of U.S. dollars) Net cash flows from (used for) operating activities $ 83 $ (7 ) $ 2,020 $ — $ 2,096 Cash flows from investing activities Purchases of fixed maturities available for sale — — (7,963 ) 3 (7,960 ) Purchases of fixed maturities held to maturity — — (129 ) — (129 ) Purchases of equity securities — — (64 ) — (64 ) Sales of fixed maturities available for sale — — 3,845 (3 ) 3,842 Sales of equity securities — — 45 — 45 Maturities and redemptions of fixed maturities available for sale — — 3,163 — 3,163 Maturities and redemptions of fixed maturities held to maturity — — 414 — 414 Net change in short-term investments (1 ) (1 ) (293 ) — (295 ) Net derivative instruments settlements — (7 ) (178 ) — (185 ) Acquisition of subsidiaries (net of cash acquired of $4) — — (172 ) — (172 ) Other — (3 ) (115 ) — (118 ) Net cash flows used for investing activities (1 ) (11 ) (1,447 ) — (1,459 ) Cash flows from financing activities Dividends paid on Common Shares (428 ) — — — (428 ) Common Shares repurchased — — (557 ) — (557 ) Proceeds from issuance of long-term debt — 699 — — 699 Proceeds from issuance of short-term debt — — 977 — 977 Repayment of long-term debt — (500 ) — — (500 ) Repayment of short-term debt — — (977 ) — (977 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 75 — 75 Advances (to) from affiliates 575 (667 ) 92 — — Net proceeds from (payments to) affiliated notional cash pooling programs (1) (185 ) 477 — (292 ) — Policyholder contract deposits — — 125 — 125 Policyholder contract withdrawals — — (33 ) — (33 ) Other — (6 ) — — (6 ) Net cash flows (used for) from financing activities (38 ) 3 (298 ) (292 ) (625 ) Effect of foreign currency rate changes on cash and cash equivalents — — 3 — 3 Net increase (decrease) in cash 44 (15 ) 278 (292 ) 15 Cash – beginning of period (1) — 16 748 (185 ) 579 Cash – end of period (1) $ 44 $ 1 $ 1,026 $ (477 ) $ 594 (1) ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2014 and December 31, 2013, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

General (Policies)

General (Policies)	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of presentation	a) Basis of presentation ACE Limited is a holding company incorporated in Zurich, Switzerland. ACE Limited, through its subsidiaries, provides a broad range of insurance and reinsurance products to insureds worldwide. ACE operates through five business segments: Insurance – North American P&C, Insurance – North American Agriculture, Insurance – Overseas General, Global Reinsurance, and Life. Refer to Note 10 for additional information. The interim unaudited consolidated financial statements, which include the accounts of ACE Limited and its subsidiaries (collectively, ACE, 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 2014 Form 10-K.
New Accounting Pronouncements, Policy [Policy Text Block]	b) Accounting guidance not yet adopted Presentation of Debt Issuance Costs In April 2015, the Financial Accounting Standards Board issued new guidance related to the accounting for debt issuance costs. The new guidance requires presentation of debt issuance costs in the balance sheet as a deduction from the carrying amount of the related debt liability instead of a deferred charge. The new guidance requires retrospective adoption and is effective for interim and annual reporting periods beginning after December 15, 2015, with early adoption permitted. The adoption of this guidance will not have any effect on our results of operations and financial condition.

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Schedule Of Amortized Cost And Fair Value Of Fixed Maturities And Related OTTI Recognized In AOCI	June 30, 2015 Amortized Cost Gross Unrealized Appreciation Gross Unrealized Depreciation Fair Value OTTI Recognized in AOCI (in millions of U.S. dollars) Available for sale U.S. Treasury and agency $ 2,743 $ 67 $ (5 ) $ 2,805 $ — Foreign 14,739 529 (112 ) 15,156 (5 ) Corporate securities 16,515 534 (171 ) 16,878 (6 ) Mortgage-backed securities 10,607 237 (60 ) 10,784 (1 ) States, municipalities, and political subdivisions 2,995 97 (14 ) 3,078 — $ 47,599 $ 1,464 $ (362 ) $ 48,701 $ (12 ) Held to maturity U.S. Treasury and agency $ 743 $ 16 $ (1 ) $ 758 $ — Foreign 808 39 (4 ) 843 — Corporate securities 3,113 72 (56 ) 3,129 — Mortgage-backed securities 1,828 50 (1 ) 1,877 — States, municipalities, and political subdivisions 2,184 32 (18 ) 2,198 — $ 8,676 $ 209 $ (80 ) $ 8,805 $ — December 31, 2014 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 $ 2,741 $ 87 $ (8 ) $ 2,820 $ — Foreign 14,703 629 (90 ) 15,242 — Corporate securities 16,897 704 (170 ) 17,431 (7 ) Mortgage-backed securities 10,011 304 (29 ) 10,286 (1 ) States, municipalities, and political subdivisions 3,474 147 (5 ) 3,616 — $ 47,826 $ 1,871 $ (302 ) $ 49,395 $ (8 ) Held to maturity U.S. Treasury and agency $ 832 $ 20 $ (2 ) $ 850 $ — Foreign 916 47 — 963 — Corporate securities 2,323 102 (2 ) 2,423 — Mortgage-backed securities 1,983 57 (1 ) 2,039 — States, municipalities, and political subdivisions 1,277 40 (3 ) 1,314 — $ 7,331 $ 266 $ (8 ) $ 7,589 $ —
Schedule Of Fixed Maturities By Contractual Maturity	June 30 December 31 2015 2014 (in millions of U.S. dollars) Amortized Cost Fair Value Amortized Cost Fair Value Available for sale Due in 1 year or less $ 1,906 $ 1,925 $ 2,187 $ 2,206 Due after 1 year through 5 years 16,377 16,808 15,444 15,857 Due after 5 years through 10 years 14,321 14,549 15,663 16,089 Due after 10 years 4,388 4,635 4,521 4,957 36,992 37,917 37,815 39,109 Mortgage-backed securities 10,607 10,784 10,011 10,286 $ 47,599 $ 48,701 $ 47,826 $ 49,395 Held to maturity Due in 1 year or less $ 377 $ 381 $ 353 $ 355 Due after 1 year through 5 years 2,589 2,685 2,603 2,693 Due after 5 years through 10 years 2,351 2,351 1,439 1,489 Due after 10 years 1,531 1,511 953 1,013 6,848 6,928 5,348 5,550 Mortgage-backed securities 1,828 1,877 1,983 2,039 $ 8,676 $ 8,805 $ 7,331 $ 7,589
Schedule Of Cost And Fair Value Of Equity Securities	June 30 December 31 (in millions of U.S. dollars) 2015 2014 Cost $ 433 $ 440 Gross unrealized appreciation 77 83 Gross unrealized depreciation (12 ) (13 ) Fair value $ 498 $ 510
Schedule Of Net Realized Gains (Losses) And The Losses Included In Net Realized Gains (Losses) And OCI	Three Months Ended Six Months Ended June 30 June 30 (in millions of U.S. dollars) 2015 2014 2015 2014 Fixed maturities: OTTI on fixed maturities, gross $ (13 ) $ (9 ) $ (26 ) $ (15 ) OTTI on fixed maturities recognized in OCI (pre-tax) 6 1 6 2 OTTI on fixed maturities, net (7 ) (8 ) (20 ) (13 ) Gross realized gains excluding OTTI 28 54 72 90 Gross realized losses excluding OTTI (16 ) (26 ) (51 ) (46 ) Total fixed maturities 5 20 1 31 Equity securities: OTTI on equity securities (1 ) (1 ) (1 ) (7 ) Gross realized gains excluding OTTI 30 2 33 4 Gross realized losses excluding OTTI — — (2 ) (1 ) Total equity securities 29 1 30 (4 ) OTTI on other investments — (3 ) — (3 ) Foreign exchange losses (40 ) (14 ) (71 ) (23 ) Investment and embedded derivative instruments 27 (15 ) 28 (40 ) Fair value adjustments on insurance derivative 104 2 59 (46 ) S&P put options and futures (2 ) (72 ) (14 ) (91 ) Other derivative instruments (1 ) 9 (1 ) 7 Other 4 (1 ) 5 (8 ) Net realized gains (losses) $ 126 $ (73 ) $ 37 $ (177 )
Schedule Of Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which A Portion Of OTTI Was Recognized In OCI	Three Months Ended Six Months Ended June 30 June 30 (in millions of U.S. dollars) 2015 2014 2015 2014 Balance of credit losses related to securities still held – beginning of period $ 22 $ 35 $ 28 $ 37 Additions where no OTTI was previously recorded 4 5 7 7 Additions where an OTTI was previously recorded 1 1 2 3 Reductions for securities sold during the period (4 ) (17 ) (14 ) (23 ) Balance of credit losses related to securities still held – end of period $ 23 $ 24 $ 23 $ 24
Schedule Of Aggregate Fair Value And Gross Unrealized Loss By Length Of Time The Security Has Continuously Been In An Unrealized Loss Position	0 – 12 Months Over 12 Months Total June 30, 2015 Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss (in millions of U.S. dollars) U.S. Treasury and agency $ 693 $ (5 ) $ 137 $ (1 ) $ 830 $ (6 ) Foreign 3,867 (104 ) 273 (12 ) 4,140 (116 ) Corporate securities 6,361 (195 ) 520 (32 ) 6,881 (227 ) Mortgage-backed securities 3,430 (46 ) 495 (15 ) 3,925 (61 ) States, municipalities, and political subdivisions 2,215 (30 ) 87 (2 ) 2,302 (32 ) Total fixed maturities 16,566 (380 ) 1,512 (62 ) 18,078 (442 ) Equity securities 80 (12 ) — — 80 (12 ) Other investments 33 (2 ) — — 33 (2 ) Total $ 16,679 $ (394 ) $ 1,512 $ (62 ) $ 18,191 $ (456 ) 0 – 12 Months Over 12 Months Total December 31, 2014 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 $ 350 $ (1 ) $ 666 $ (9 ) $ 1,016 $ (10 ) Foreign 2,262 (75 ) 375 (15 ) 2,637 (90 ) Corporate securities 4,684 (150 ) 738 (22 ) 5,422 (172 ) Mortgage-backed securities 704 (2 ) 1,663 (28 ) 2,367 (30 ) States, municipalities, and political subdivisions 458 (3 ) 490 (5 ) 948 (8 ) Total fixed maturities 8,458 (231 ) 3,932 (79 ) 12,390 (310 ) Equity securities 101 (13 ) — — 101 (13 ) Total $ 8,559 $ (244 ) $ 3,932 $ (79 ) $ 12,491 $ (323 )
Schedule Of Components Of Restricted Assets	June 30 December 31 (in millions of U.S. dollars) 2015 2014 Trust funds $ 11,085 $ 10,838 Deposits with non-U.S. regulatory authorities 2,263 2,305 Assets pledged under repurchase agreements 1,458 1,431 Deposits with U.S. regulatory authorities 1,327 1,345 Other pledged assets 398 457 $ 16,531 $ 16,376

Fair value measurements (Tables

Fair value measurements (Tables)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Fair Value Disclosures [Abstract]
Financial Instruments Measured At Fair Value On A Recurring Basis	June 30, 2015 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available for sale U.S. Treasury and agency $ 1,741 $ 1,064 $ — $ 2,805 Foreign — 15,100 56 15,156 Corporate securities — 16,711 167 16,878 Mortgage-backed securities — 10,729 55 10,784 States, municipalities, and political subdivisions — 3,078 — 3,078 1,741 46,682 278 48,701 Equity securities 483 13 2 498 Short-term investments 1,108 954 — 2,062 Other investments 370 279 2,679 3,328 Securities lending collateral — 1,080 — 1,080 Investment derivative instruments 16 — — 16 Other derivative instruments 23 — — 23 Separate account assets 1,567 84 — 1,651 Total assets measured at fair value $ 5,308 $ 49,092 $ 2,959 $ 57,359 Liabilities: Investment derivative instruments $ 15 $ — $ — $ 15 Other derivative instruments — — 3 3 GLB (1) — — 347 347 Total liabilities measured at fair value $ 15 $ — $ 350 $ 365 (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 liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information. December 31, 2014 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available for sale U.S. Treasury and agency $ 1,680 $ 1,140 $ — $ 2,820 Foreign — 15,220 22 15,242 Corporate securities — 17,244 187 17,431 Mortgage-backed securities — 10,271 15 10,286 States, municipalities, and political subdivisions — 3,616 — 3,616 1,680 47,491 224 49,395 Equity securities 492 16 2 510 Short-term investments 1,183 1,139 — 2,322 Other investments 370 257 2,719 3,346 Securities lending collateral — 1,330 — 1,330 Investment derivative instruments 18 — — 18 Other derivative instruments — 2 — 2 Separate account assets 1,400 90 — 1,490 Total assets measured at fair value $ 5,143 $ 50,325 $ 2,945 $ 58,413 Liabilities: Investment derivative instruments $ 36 $ — $ — $ 36 Other derivative instruments 21 — 4 25 GLB (1) — — 406 406 Total liabilities measured at fair value $ 57 $ — $ 410 $ 467 (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 liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information.
Fair Value And Maximum Future Funding Commitments Related To Investments	June 30 December 31 Expected Liquidation Period of Underlying Assets 2015 2014 (in millions of U.S. dollars) Fair Value Maximum Future Funding Commitments Fair Value Maximum Future Funding Commitments Financial 5 to 9 Years $ 306 $ 124 $ 282 $ 145 Real Assets 3 to 7 Years 460 177 451 210 Distressed 5 to 9 Years 242 252 232 175 Private Credit 3 to 7 Years 291 234 299 190 Traditional 3 to 9 Years 897 224 908 289 Vintage 1 to 2 Years 16 — 11 1 Investment funds Not Applicable 306 — 378 — $ 2,518 $ 1,011 $ 2,561 $ 1,010
Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations	(in millions of U.S. dollars, except for percentages) Fair Value Valuation Technique Significant Unobservable Inputs Ranges June 30, 2015 December 31, 2014 GLB (1) $ 347 $ 406 Actuarial model Lapse rate 1% – 30% Annuitization rate 0% – 55% (1) Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 4 a) Guaranteed living benefits.
Financial Instruments Measured At Fair Value Using Significant Unobservable Inputs	Assets Liabilities Six Months Ended Available-for-Sale Debt Securities Equity Other Other GLB (1) June 30, 2015 Foreign Corporate MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 22 $ 187 $ 15 $ 2 $ 2,719 4 $ 406 Transfers into Level 3 28 13 — — — — — Transfers out of Level 3 — — — — — — — Change in Net Unrealized Gains (Losses) included in OCI (2 ) — — — (14 ) — — Included in earnings: Net Realized Gains/Losses — (3 ) — (1 ) 11 (1 ) (59 ) Other income (expense) — — — — 40 — — Purchases 9 16 41 1 177 — — Sales (1 ) (5 ) — — (25 ) — — Settlements — (41 ) (1 ) — (229 ) — — Balance–End of Period $ 56 $ 167 $ 55 $ 2 $ 2,679 $ 3 $ 347 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ (2 ) $ — $ (1 ) $ — $ (1 ) $ (59 ) (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 liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information. Assets Liabilities Six Months Ended Available-for-Sale Debt Securities Short-term investments Other investments GLB (1) June 30, 2014 Foreign Corporate MBS Equity (in millions of U.S. dollars) Balance–Beginning of Period $ 44 $ 166 $ 8 $ 4 $ 7 $ 2,440 $ 193 Transfers into Level 3 2 30 — — — — — Transfers out of Level 3 (34 ) (22 ) — (2 ) (7 ) — — Change in Net Unrealized Gains (Losses) included in OCI (1 ) 2 — 1 — 48 — Included in earnings: Net Realized Gains/Losses 1 — — — — (3 ) 48 Other income (expense) — — — — — 104 — Purchases 2 45 — 1 — 248 — Sales (2 ) (8 ) — (2 ) — (3 ) — Settlements — (9 ) (1 ) — — (194 ) — Balance–End of Period $ 12 $ 204 $ 7 $ 2 $ — $ 2,640 $ 241 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ — $ — $ — $ — $ (3 ) $ 48 (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 liability classified as Future policy benefits in the consolidated balance sheets. The liability for GLB reinsurance was $486 million at June 30, 2014 and $427 million at December 31, 2013, which includes a fair value derivative adjustment of $241 million and $193 million , respectively.	Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity securities Other investments Other derivative instruments GLB (1) June 30, 2015 Foreign Corporate securities MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 22 $ 167 $ 33 $ 2 $ 2,789 $ 4 $ 451 Transfers into Level 3 28 12 — — — — — Transfers out of Level 3 — — — — — — — Change in Net Unrealized Gains (Losses) included in OCI (2 ) (3 ) — — 6 — — Included in earnings: Net Realized Gains/Losses — — — (1 ) 11 (1 ) (104 ) Other income (expense) — — — — 18 — — Purchases 8 8 23 1 52 — — Sales — (2 ) — — (25 ) — — Settlements — (15 ) (1 ) — (172 ) — — Balance–End of Period $ 56 $ 167 $ 55 $ 2 $ 2,679 $ 3 $ 347 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ — $ — $ (1 ) $ — $ (1 ) $ (104 ) (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 liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information. Assets Liabilities Three Months Ended Available-for-Sale Debt Securities Equity Other GLB (1) June 30, 2014 Foreign Corporate MBS (in millions of U.S. dollars) Balance–Beginning of Period $ 26 $ 151 $ 8 $ 2 $ 2,611 $ 243 Transfers into Level 3 2 26 — — — — Transfers out of Level 3 (16 ) — — — — — Change in Net Unrealized Gains (Losses) included in OCI — 2 — — 7 — Included in earnings: Net Realized Gains/Losses 1 — — — (3 ) (2 ) Other income (expense) — — — — 43 — Purchases — 30 — — 109 — Sales (1 ) (2 ) — — (2 ) — Settlements — (3 ) (1 ) — (125 ) — Balance–End of Period $ 12 $ 204 $ 7 $ 2 $ 2,640 $ 241 Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date $ — $ — $ — $ — $ (3 ) $ (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 liability classified as Future policy benefits in the consolidated balance sheets. The liability for GLB reinsurance was $486 million at June 30, 2014 , and $483 million at March 31, 2014, which includes a fair value derivative adjustment of $241 million and $243 million, respectively.
Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value	June 30, 2015 Fair Value Carrying Value (in millions of U.S. dollars) Level 1 Level 2 Level 3 Total Assets: Fixed maturities held to maturity U.S. Treasury and agency $ 583 $ 175 $ — $ 758 $ 743 Foreign — 843 — 843 808 Corporate securities — 3,115 14 3,129 3,113 Mortgage-backed securities — 1,877 — 1,877 1,828 States, municipalities, and political subdivisions — 2,198 — 2,198 2,184 583 8,208 14 8,805 8,676 Partially-owned insurance companies — — 638 638 638 Total assets $ 583 $ 8,208 $ 652 $ 9,443 $ 9,314 Liabilities: Short-term debt $ — $ 2,107 $ — $ 2,107 $ 2,102 Long-term debt — 4,383 — 4,383 4,157 Trust preferred securities — 457 — 457 309 Total liabilities $ — $ 6,947 $ — $ 6,947 $ 6,568 December 31, 2014 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 $ 659 $ 191 $ — $ 850 $ 832 Foreign — 963 — 963 916 Corporate securities — 2,408 15 2,423 2,323 Mortgage-backed securities — 2,039 — 2,039 1,983 States, municipalities, and political subdivisions — 1,314 — 1,314 1,277 659 6,915 15 7,589 7,331 Partially-owned insurance companies — — 504 504 504 Total assets $ 659 $ 6,915 $ 519 $ 8,093 $ 7,835 Liabilities: Short-term debt $ — $ 2,571 $ — $ 2,571 $ 2,552 Long-term debt — 3,690 — 3,690 3,357 Trust preferred securities — 462 — 462 309 Total liabilities $ — $ 6,723 $ — $ 6,723 $ 6,218

Assumed life reinsurance prog25

Assumed life reinsurance programs involving minimum benefit guarantees under annuity contracts (Tables)	6 Months Ended
	Jun. 30, 2015
Reinsurance Disclosures [Abstract]
Schedule Of Guaranteed Minimum Death Benefits And Guaranteed Minimum Income Benefits Income And Expense	Three Months Ended Six Months Ended June 30 June 30 (in millions of U.S. dollars) 2015 2014 2015 2014 GMDB Net premiums earned $ 16 $ 18 $ 32 $ 37 Policy benefits and other reserve adjustments $ 11 $ 13 $ 20 $ 28 GLB Net premiums earned $ 30 $ 34 $ 62 $ 70 Policy benefits and other reserve adjustments 7 10 19 19 Net realized gains (losses) 104 2 59 (48 ) Gain recognized in Net income $ 127 $ 26 $ 102 $ 3 Less: Net cash received 26 29 54 62 Net (increase) decrease in liability $ 101 $ (3 ) $ 48 $ (59 )

Commitments, contingencies, a26

Commitments, contingencies, and guarantees (Tables)	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Balance Sheet Locations, Fair Values In An Asset Or (Liability) Position, And Notional Values/Payment Provisions Of Derivative Instruments	June 30, 2015 December 31, 2014 Consolidated Balance Sheet Location Fair Value Notional Value/ Payment Provision Fair Value Notional Value/ Payment Provision (in millions of U.S. dollars) Derivative Asset Derivative (Liability) Derivative Asset Derivative (Liability) Investment and embedded derivative instruments Foreign currency forward contracts OA / (AP) $ 6 $ (13 ) $ 1,309 $ 12 $ (7 ) $ 1,329 Cross-currency swaps OA / (AP) — — 95 — — 95 Futures contracts on money market instruments OA / (AP) 1 (1 ) 4,355 — — 2,467 Options/Futures contracts on notes and bonds OA / (AP) 9 (1 ) 920 6 (29 ) 1,636 Convertible securities (1) FM AFS / ES 292 — 277 291 — 267 $ 308 $ (15 ) $ 6,956 $ 309 $ (36 ) $ 5,794 Other derivative instruments Futures contracts on equities (2) OA / (AP) $ 16 $ — $ 1,286 $ — $ (21 ) $ 1,384 Options on equity market indices (2) OA / (AP) — — 250 2 — 250 Other OA / (AP) 7 (3 ) 401 — (4 ) 10 $ 23 $ (3 ) $ 1,937 $ 2 $ (25 ) $ 1,644 GLB (3) (AP) / (FPB) $ — $ (615 ) $ 786 $ — $ (663 ) $ 675 (1) Includes fair value of embedded derivatives. (2) Related to GMDB and GLB blocks of business. (3) Includes both future policy benefits reserves and fair value derivative adjustment. Refer to Note 5 for additional information. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts.
Transfer of Certain Financial Assets Accounted for as Secured Borrowings	The following table presents the carrying value of collateral pledged under repurchase agreements by investment category and maturity date of the underlying agreements: Remaining contractual maturity June 30, 2015 30 - 90 Days Greater than 90 Days Total (in millions of U.S. dollars) Collateral pledged under repurchase agreements: Cash $ — $ 5 $ 5 U.S. Treasury and agency 62 176 238 Mortgage-backed securities 86 1,129 1,215 $ 148 $ 1,310 $ 1,458 Gross amount of recognized liabilities for repurchase agreements $ 1,402 Difference (1) $ 56 (1) Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.
Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations	Three Months Ended Six Months Ended June 30 June 30 (in millions of U.S. dollars) 2015 2014 2015 2014 Investment and embedded derivative instruments Foreign currency forward contracts $ (10 ) $ (1 ) $ 15 $ (4 ) All other futures contracts and options 42 (18 ) 13 (40 ) Convertible securities (1) (5 ) 4 — 4 Total investment and embedded derivative instruments $ 27 $ (15 ) $ 28 $ (40 ) GLB and other derivative instruments GLB (2) $ 104 $ 2 $ 59 $ (46 ) Futures contracts on equities (3) (2 ) (71 ) (13 ) (88 ) Options on equity market indices (3) — (1 ) (1 ) (3 ) Other (1 ) 9 (1 ) 7 Total GLB and other derivative instruments $ 101 $ (61 ) $ 44 $ (130 ) $ 128 $ (76 ) $ 72 $ (170 ) (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)	6 Months Ended
	Jun. 30, 2015
Shareholders' equity [Abstract]
Dividends Declared [Table Text Block]	The following table presents dividend distributions per Common Share in Swiss francs (CHF) and U.S. dollars (USD): Three Months Ended Six Months Ended June 30 June 30 2015 2014 2015 2014 CHF USD CHF USD CHF USD CHF USD Dividends – par value reduction — $ 0.58 $ 0.65 0.62 $ 0.65 1.03 $ 1.16 Dividends – distributed from capital contribution reserves 0.62 0.67 — — 0.62 0.67 0.20 0.24 Total dividend distributions per common share 0.62 $ 0.67 0.58 $ 0.65 1.24 $ 1.32 1.23 $ 1.40
Share Repurchase Program [Table Text Block]	The following table presents repurchases of ACE's Common Shares conducted in a series of open market transactions under the Board authorizations: (in millions of U.S. dollars, except share data) Three Months Ended June 30 Six Months Ended June 30 2015 2014 2015 2014 Number of shares repurchased 3,650,200 2,306,000 6,677,663 5,793,882 Cost of shares repurchased $ 394 $ 237 $ 734 $ 569 Repurchase authorization remaining at end of period $ 766 $ 1,374 $ 766 $ 1,374

Segment information (Tables)

Segment information (Tables)	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Operations By Segment	For the Three Months Ended June 30, 2015 Insurance – North American P&C Insurance – North American Agriculture Insurance – Overseas General Global Reinsurance Life Corporate ACE Consolidated (in millions of U.S. dollars) Net premiums written $ 1,975 $ 379 $ 1,669 $ 261 $ 500 $ — $ 4,784 Net premiums earned 1,688 321 1,644 220 487 — 4,360 Losses and loss expenses 1,120 271 816 72 137 1 2,417 Policy benefits — — — — 153 — 153 Policy acquisition costs 130 23 396 60 118 — 727 Administrative expenses 189 4 254 13 74 44 578 Underwriting income (loss) 249 23 178 75 5 (45 ) 485 Net investment income 269 6 139 79 66 3 562 Net realized gains (losses) including OTTI — (2 ) 13 5 103 7 126 Interest expense 2 — 1 1 2 65 71 Other (income) expense: (Gains) losses from fair value changes in separate account assets — — — — (6 ) — (6 ) Other 23 8 8 (3 ) (17 ) 4 23 Income tax expense (benefit) 89 4 69 7 10 (36 ) 143 Net income (loss) $ 404 $ 15 $ 252 $ 154 $ 185 $ (68 ) $ 942 For the Three Months Ended June 30, 2014 Insurance – North American P&C Insurance – North American Agriculture Insurance – Overseas General Global Reinsurance Life Corporate ACE Consolidated (in millions of U.S. dollars) Net premiums written $ 1,635 $ 388 $ 1,760 $ 278 $ 498 $ — $ 4,559 Net premiums earned 1,542 330 1,709 261 490 — 4,332 Losses and loss expenses 1,016 287 830 109 146 — 2,388 Policy benefits — — — — 144 — 144 Policy acquisition costs 152 23 402 60 121 — 758 Administrative expenses 175 1 256 14 73 47 566 Underwriting income (loss) 199 19 221 78 6 (47 ) 476 Net investment income 265 6 136 80 66 3 556 Net realized gains (losses) including OTTI (11 ) 8 14 (15 ) (72 ) 3 (73 ) Interest expense 2 — 1 2 3 64 72 Other (income) expense: (Gains) losses from fair value changes in separate account assets — — — — (17 ) — (17 ) Other (24 ) 9 8 (10 ) 4 5 (8 ) Income tax expense (benefit) 91 5 55 10 12 (40 ) 133 Net income (loss) $ 384 $ 19 $ 307 $ 141 $ (2 ) $ (70 ) $ 779 For the Six Months Ended June 30, 2015 Insurance – North American P&C Insurance – North American Agriculture Insurance – Overseas General Global Reinsurance Life Corporate ACE Consolidated (in millions of U.S. dollars) Net premiums written $ 3,405 $ 467 $ 3,463 $ 534 $ 991 $ — $ 8,860 Net premiums earned 3,214 385 3,281 446 961 — 8,287 Losses and loss expenses 2,155 293 1,630 171 289 1 4,539 Policy benefits — — — — 295 — 295 Policy acquisition costs 291 19 785 114 225 — 1,434 Administrative expenses 360 3 510 25 147 87 1,132 Underwriting income (loss) 408 70 356 136 5 (88 ) 887 Net investment income 532 12 277 154 132 6 1,113 Net realized gains (losses) including OTTI (6 ) (2 ) 3 (6 ) 44 4 37 Interest expense 4 — 2 2 3 128 139 Other (income) expense: (Gains) losses from fair value changes in separate account assets — — — — (17 ) — (17 ) Other 16 16 25 (8 ) (29 ) 9 29 Income tax expense (benefit) 169 14 121 15 19 (75 ) 263 Net income (loss) $ 745 $ 50 $ 488 $ 275 $ 205 $ (140 ) $ 1,623 For the Six Months Ended June 30, 2014 Insurance – North American P&C Insurance – North American Agriculture Insurance – Overseas General Global Reinsurance Life Corporate ACE Consolidated (in millions of U.S. dollars) Net premiums written $ 3,053 $ 582 $ 3,531 $ 586 $ 992 $ — $ 8,744 Net premiums earned 3,029 433 3,321 545 974 — 8,302 Losses and loss expenses 1,956 413 1,647 235 297 1 4,549 Policy benefits — — — — 258 — 258 Policy acquisition costs 311 28 788 127 232 — 1,486 Administrative expenses 336 2 506 28 141 88 1,101 Underwriting income (loss) 426 (10 ) 380 155 46 (89 ) 908 Net investment income 535 13 268 157 130 6 1,109 Net realized gains (losses) including OTTI (20 ) 6 4 (23 ) (148 ) 4 (177 ) Interest expense 5 — 2 3 6 127 143 Other (income) expense: (Gains) losses from fair value changes in separate account assets — — — — (11 ) — (11 ) Other (44 ) 17 2 (29 ) 11 12 (31 ) Income tax expense (benefit) 174 (2 ) 92 20 22 (80 ) 226 Net income (loss) $ 806 $ (6 ) $ 556 $ 295 $ — $ (138 ) $ 1,513
Net Premiums Earned For Segment By Product	(in millions of U.S. dollars) Property & All Other Casualty Life, Accident & Health ACE Consolidated For the Three Months Ended June 30, 2015 Insurance – North American P&C $ 507 $ 1,079 $ 102 $ 1,688 Insurance – North American Agriculture 321 — — 321 Insurance – Overseas General 729 391 524 1,644 Global Reinsurance 102 118 — 220 Life — — 487 487 $ 1,659 $ 1,588 $ 1,113 $ 4,360 For the Three Months Ended June 30, 2014 Insurance – North American P&C $ 423 $ 1,018 $ 101 $ 1,542 Insurance – North American Agriculture 330 — — 330 Insurance – Overseas General 727 395 587 1,709 Global Reinsurance 132 129 — 261 Life — — 490 490 $ 1,612 $ 1,542 $ 1,178 $ 4,332 (in millions of U.S. dollars) Property & Casualty Life, ACE For the Six Months Ended June 30, 2015 Insurance – North American P&C $ 917 $ 2,094 $ 203 $ 3,214 Insurance – North American Agriculture 385 — — 385 Insurance – Overseas General 1,457 773 1,051 3,281 Global Reinsurance 219 227 — 446 Life — — 961 961 $ 2,978 $ 3,094 $ 2,215 $ 8,287 For the Six Months Ended June 30, 2014 Insurance – North American P&C $ 828 $ 1,999 $ 202 $ 3,029 Insurance – North American Agriculture 433 — — 433 Insurance – Overseas General 1,420 764 1,137 3,321 Global Reinsurance 286 259 — 545 Life — — 974 974 $ 2,967 $ 3,022 $ 2,313 $ 8,302

Earnings per share (Tables)

Earnings per share (Tables)	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Schedule Of Earnings Per Share, Basic And Diluted	Three Months Ended Six Months Ended June 30 June 30 (in millions of U.S. dollars, except share and per share data) 2015 2014 2015 2014 Numerator: Net income $ 942 $ 779 $ 1,623 $ 1,513 Denominator: Denominator for basic earnings per share: Weighted-average shares outstanding 325,463,196 337,846,228 326,795,838 338,353,260 Denominator for diluted earnings per share: Share-based compensation plans 3,222,562 3,286,359 3,373,809 3,267,499 Weighted-average shares outstanding and assumed conversions 328,685,758 341,132,587 330,169,647 341,620,759 Basic earnings per share $ 2.89 $ 2.30 $ 4.97 $ 4.47 Diluted earnings per share $ 2.86 $ 2.28 $ 4.91 $ 4.43 Potential anti-dilutive share conversions 1,934,454 1,778,040 1,306,817 1,220,731

Information provided in conne30

Information provided in connection with outstanding debt of subsidiaries (Tables)	6 Months Ended
	Jun. 30, 2015
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract]
Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet at June 30, 2015 (in millions of U.S. dollars) ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated Assets Investments $ 32 $ 35 $ 63,198 $ — $ 63,265 Cash (1) 1 3 1,209 (423 ) 790 Insurance and reinsurance balances receivable — — 6,726 (969 ) 5,757 Reinsurance recoverable on losses and loss expenses — — 20,619 (8,844 ) 11,775 Reinsurance recoverable on policy benefits — — 1,192 (989 ) 203 Value of business acquired — — 434 — 434 Goodwill and other intangible assets — — 5,969 — 5,969 Investments in subsidiaries 29,806 18,747 — (48,553 ) — Due from subsidiaries and affiliates, net 370 — — (370 ) — Other assets 5 381 15,026 (3,765 ) 11,647 Total assets $ 30,214 $ 19,166 $ 114,373 $ (63,913 ) $ 99,840 Liabilities Unpaid losses and loss expenses $ — $ — $ 46,596 $ (8,366 ) $ 38,230 Unearned premiums — — 10,718 (1,839 ) 8,879 Future policy benefits — — 5,824 (989 ) 4,835 Due to subsidiaries and affiliates, net — 245 125 (370 ) — Affiliated notional cash pooling programs (1) 386 37 — (423 ) — Short-term debt — 700 1,402 — 2,102 Long-term debt — 4,145 12 — 4,157 Trust preferred securities — 309 — — 309 Other liabilities 273 1,499 13,374 (3,373 ) 11,773 Total liabilities 659 6,935 78,051 (15,360 ) 70,285 Total shareholders’ equity 29,555 12,231 36,322 (48,553 ) 29,555 Total liabilities and shareholders’ equity $ 30,214 $ 19,166 $ 114,373 $ (63,913 ) $ 99,840 (1) ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015 , the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Balance Sheet at December 31, 2014 (in millions of U.S. dollars) ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated Assets Investments $ 30 $ 225 $ 62,649 $ — $ 62,904 Cash (1) — 1 1,209 (555 ) 655 Insurance and reinsurance balances receivable — — 6,178 (752 ) 5,426 Reinsurance recoverable on losses and loss expenses — — 20,992 (9,000 ) 11,992 Reinsurance recoverable on policy benefits — — 1,194 (977 ) 217 Value of business acquired — — 466 — 466 Goodwill and other intangible assets — — 5,724 — 5,724 Investments in subsidiaries 29,497 18,762 — (48,259 ) — Due from subsidiaries and affiliates, net 583 — — (583 ) — Other assets 4 295 14,196 (3,631 ) 10,864 Total assets $ 30,114 $ 19,283 $ 112,608 $ (63,757 ) $ 98,248 Liabilities Unpaid losses and loss expenses $ — $ — $ 46,770 $ (8,455 ) $ 38,315 Unearned premiums — — 9,958 (1,736 ) 8,222 Future policy benefits — — 5,731 (977 ) 4,754 Due to subsidiaries and affiliates, net — 422 161 (583 ) — Affiliated notional cash pooling programs (1) 246 309 — (555 ) — Short-term debt — 1,150 1,402 — 2,552 Long-term debt — 3,345 12 — 3,357 Trust preferred securities — 309 — — 309 Other liabilities 281 1,404 12,659 (3,192 ) 11,152 Total liabilities 527 6,939 76,693 (15,498 ) 68,661 Total shareholders’ equity 29,587 12,344 35,915 (48,259 ) 29,587 Total liabilities and shareholders’ equity $ 30,114 $ 19,283 $ 112,608 $ (63,757 ) $ 98,248 (1) ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2014 , 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 June 30, 2015 ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 4,784 $ — $ 4,784 Net premiums earned — — 4,360 — 4,360 Net investment income — — 562 — 562 Equity in earnings of subsidiaries 901 296 — (1,197 ) — Net realized gains (losses) including OTTI — (2 ) 128 — 126 Losses and loss expenses — — 2,417 — 2,417 Policy benefits — — 153 — 153 Policy acquisition costs and administrative expenses 18 7 1,280 — 1,305 Interest (income) expense (7 ) 69 9 — 71 Other (income) expense (57 ) (4 ) 78 — 17 Income tax expense (benefit) 5 (27 ) 165 — 143 Net income $ 942 $ 249 $ 948 $ (1,197 ) $ 942 Comprehensive income (loss) $ 397 $ (91 ) $ 403 $ (312 ) $ 397 Condensed Consolidating Statements of Operations and Comprehensive Income For the Three Months Ended June 30, 2014 ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 4,559 $ — $ 4,559 Net premiums earned — — 4,332 — 4,332 Net investment income 1 1 554 — 556 Equity in earnings of subsidiaries 745 231 — (976 ) — Net realized gains (losses) including OTTI — 8 (81 ) — (73 ) Losses and loss expenses — — 2,388 — 2,388 Policy benefits — — 144 — 144 Policy acquisition costs and administrative expenses 22 8 1,294 — 1,324 Interest (income) expense (9 ) 70 11 — 72 Other (income) expense (50 ) 6 19 — (25 ) Income tax expense (benefit) 4 (25 ) 154 — 133 Net income $ 779 $ 181 $ 795 $ (976 ) $ 779 Comprehensive income $ 1,348 $ 511 $ 1,364 $ (1,875 ) $ 1,348 Condensed Consolidating Statements of Operations and Comprehensive Income For the Six Months Ended June 30, 2015 ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 8,860 $ — $ 8,860 Net premiums earned — — 8,287 — 8,287 Net investment income 1 1 1,111 — 1,113 Equity in earnings of subsidiaries 1,549 500 — (2,049 ) — Net realized gains (losses) including OTTI — (2 ) 39 — 37 Losses and loss expenses — — 4,539 — 4,539 Policy benefits — — 295 — 295 Policy acquisition costs and administrative expenses 32 13 2,521 — 2,566 Interest (income) expense (15 ) 138 16 — 139 Other (income) expense (98 ) (7 ) 117 — 12 Income tax expense (benefit) 8 (53 ) 308 — 263 Net income $ 1,623 $ 408 $ 1,641 $ (2,049 ) $ 1,623 Comprehensive income (loss) $ 1,039 $ (67 ) $ 1,057 $ (990 ) $ 1,039 Condensed Consolidating Statements of Operations and Comprehensive Income For the Six Months Ended June 30, 2014 ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated (in millions of U.S. dollars) Net premiums written $ — $ — $ 8,744 $ — $ 8,744 Net premiums earned — — 8,302 — 8,302 Net investment income 1 1 1,107 — 1,109 Equity in earnings of subsidiaries 1,447 411 — (1,858 ) — Net realized gains (losses) including OTTI — 7 (184 ) — (177 ) Losses and loss expenses — — 4,549 — 4,549 Policy benefits — — 258 — 258 Policy acquisition costs and administrative expenses 39 14 2,534 — 2,587 Interest (income) expense (19 ) 141 21 — 143 Other (income) expense (92 ) 20 30 — (42 ) Income tax expense (benefit) 7 (55 ) 274 — 226 Net income $ 1,513 $ 299 $ 1,559 $ (1,858 ) $ 1,513 Comprehensive income $ 2,456 $ 777 $ 2,502 $ (3,279 ) $ 2,456
Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows For the Six Months Ended June 30, 2015 ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Consolidating Adjustments and Eliminations ACE Limited Consolidated (in millions of U.S. dollars) Net cash flows from (used for) operating activities $ 65 $ (35 ) $ 1,861 $ — $ 1,891 Cash flows from investing activities Purchases of fixed maturities available for sale — — (9,210 ) — (9,210 ) Purchases of fixed maturities held to maturity — — (24 ) — (24 ) Purchases of equity securities — — (70 ) — (70 ) Sales of fixed maturities available for sale — — 3,642 — 3,642 Sales of equity securities — — 102 — 102 Maturities and redemptions of fixed maturities available for sale — — 3,691 — 3,691 Maturities and redemptions of fixed maturities held to maturity — — 470 — 470 Net change in short-term investments — 190 38 — 228 Net derivative instruments settlements — (9 ) (24 ) — (33 ) Acquisition of subsidiaries (net of cash acquired of $620) — — 255 — 255 Other — (2 ) (69 ) — (71 ) Net cash flows from (used for) investing activities — 179 (1,199 ) — (1,020 ) Cash flows from financing activities Dividends paid on Common Shares (427 ) — — — (427 ) Common Shares repurchased — — (750 ) — (750 ) Proceeds from issuance of long-term debt — 800 — — 800 Proceeds from issuance of short-term debt — — 1,327 — 1,327 Repayment of long-term debt — (450 ) — — (450 ) Repayment of short-term debt — — (1,327 ) — (1,327 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 46 — 46 Advances (to) from affiliates 223 (214 ) (9 ) — — Net payments to affiliated notional cash pooling programs (1) 140 (272 ) — 132 — Policyholder contract deposits — — 235 — 235 Policyholder contract withdrawals — — (107 ) — (107 ) Other — (6 ) — — (6 ) Net cash flows used for financing activities (64 ) (142 ) (585 ) 132 (659 ) Effect of foreign currency rate changes on cash and cash equivalents — — (77 ) — (77 ) Net increase in cash 1 2 — 132 135 Cash – beginning of period (1) — 1 1,209 (555 ) 655 Cash – end of period (1) $ 1 $ 3 $ 1,209 $ (423 ) $ 790 (1) ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive. Condensed Consolidating Statement of Cash Flows For the Six Months Ended June 30, 2014 ACE Limited (Parent Guarantor) ACE INA Holdings Inc. (Subsidiary Issuer) Other ACE Limited Subsidiaries Consolidating Adjustments and Eliminations ACE Limited Consolidated (in millions of U.S. dollars) Net cash flows from (used for) operating activities $ 83 $ (7 ) $ 2,020 $ — $ 2,096 Cash flows from investing activities Purchases of fixed maturities available for sale — — (7,963 ) 3 (7,960 ) Purchases of fixed maturities held to maturity — — (129 ) — (129 ) Purchases of equity securities — — (64 ) — (64 ) Sales of fixed maturities available for sale — — 3,845 (3 ) 3,842 Sales of equity securities — — 45 — 45 Maturities and redemptions of fixed maturities available for sale — — 3,163 — 3,163 Maturities and redemptions of fixed maturities held to maturity — — 414 — 414 Net change in short-term investments (1 ) (1 ) (293 ) — (295 ) Net derivative instruments settlements — (7 ) (178 ) — (185 ) Acquisition of subsidiaries (net of cash acquired of $4) — — (172 ) — (172 ) Other — (3 ) (115 ) — (118 ) Net cash flows used for investing activities (1 ) (11 ) (1,447 ) — (1,459 ) Cash flows from financing activities Dividends paid on Common Shares (428 ) — — — (428 ) Common Shares repurchased — — (557 ) — (557 ) Proceeds from issuance of long-term debt — 699 — — 699 Proceeds from issuance of short-term debt — — 977 — 977 Repayment of long-term debt — (500 ) — — (500 ) Repayment of short-term debt — — (977 ) — (977 ) Proceeds from share-based compensation plans, including windfall tax benefits — — 75 — 75 Advances (to) from affiliates 575 (667 ) 92 — — Net proceeds from (payments to) affiliated notional cash pooling programs (1) (185 ) 477 — (292 ) — Policyholder contract deposits — — 125 — 125 Policyholder contract withdrawals — — (33 ) — (33 ) Other — (6 ) — — (6 ) Net cash flows (used for) from financing activities (38 ) 3 (298 ) (292 ) (625 ) Effect of foreign currency rate changes on cash and cash equivalents — — 3 — 3 Net increase (decrease) in cash 44 (15 ) 278 (292 ) 15 Cash – beginning of period (1) — 16 748 (185 ) 579 Cash – end of period (1) $ 44 $ 1 $ 1,026 $ (477 ) $ 594 (1) ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2014 and December 31, 2013, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Acquisitions (Detail)

Acquisitions (Detail) - USD ($) $ / shares in Units, $ in Millions

Jun. 17, 2014

Jun. 30, 2015

Apr. 01, 2015

Dec. 31, 2014

Oct. 31, 2014

Jun. 30, 2014

[4]

Apr. 28, 2014

Dec. 31, 2013

[4]

Business Acquisition - To be acquired [Line Items]

Share Price

$ 101.68

Business Acquisition [Line Items]

Unpaid losses and loss expenses

$ 38,230

$ 38,315

Unearned premiums

8,879

8,222

Insurance and reinsurance balances receivable

5,757

5,426

Cash

$ 790

[1],[2]

$ 655

[1],[3]

$ 594

$ 579

The Siam Commercial Samaggi Insurance PCL [Member]

Business Acquisition [Line Items]

Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage

32.17%

60.86%

Business Acquisition, Purchase Price Allocation, Goodwill Amount

$ 46

Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill

$ 80

Business Combination Total Ownership Percentage

93.03%

Business Combination, Consideration Transferred

$ 176

Large Corporate P&C Business Of Itau Seguros [Member]

Business Acquisition [Line Items]

Business Acquisition, Purchase Price Allocation, Goodwill Amount

$ 449

Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill

60

Business Acquisition, Cost of Acquired Entity, Expected Cash Consideration

$ 610

Fireman's Fund high net worth personal lines [Member]

Business Acquisition [Line Items]

Business Acquisition, Purchase Price Allocation, Goodwill Amount

$ 208

Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill

266

Business Acquisition, Cost of Acquired Entity, Expected Cash Consideration

365

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities

858

Unpaid losses and loss expenses

402

Unearned premiums

428

Insurance and reinsurance balances receivable

128

Cash

620

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets

$ 749

The Chubb Corporation [Member]

Business Acquisition - To be acquired [Line Items]

Business Acquisition, Cost of Acquired Entity, Expected Cash Consideration Per Share

$ 62.93

Business Acquisition, Cost of Acquired Entity, Expected Stock Consideration Per Share

0.6019

Business Acquisition Expected Outstanding Share Ownership To Be Held By Acquired Company Shareholders

137,000,000

Business Acquisition, Expected Outstanding Share Ownership To Be Held By Acquired Company Shareholders

30.00%

Business Acquisition, Cost of Acquired Entity, Expected Cash and Stock Consideration

$ 28,300

Business Acquisition, Expected Financing of Acquisition with Issuance of Senior Notes

5,300

Business Acquisition, Expected Financing Of Acquisition With Cash

$ 9,000

[1]

ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[2]

ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[3]

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

[4]

ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2014 and December 31, 2013, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Investments (Narrative) (Detail

Investments (Narrative) (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015USD ($)Security	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)Security	Jun. 30, 2014USD ($)	Apr. 30, 2015USD ($)	Apr. 14, 2015USD ($)	Mar. 27, 2015USD ($)	Dec. 31, 2014USD ($)
Investment [Line Items]
Total number of fixed maturities | Security	26,933		26,933
Largest single unrealized loss in the fixed maturities	$ 5		$ 5
Number of equity securities in an unrealized loss position | Security	99		99
Total number of equity securities | Security	271		271
Largest single unrealized loss in the equity securities	$ 1		$ 1
Restricted assets in fixed maturities and short-term investments	16,500		16,500					$ 16,300
Restricted assets in cash	80		$ 80					117
Moodys Historical Mean Recovery Rate			42.00%
Company Assumed Recovery Rate			32.00%
Net unrealized depreciation included in AOCI	7		$ 7					3
Fair value of securities transferred from AFS to HTM					$ 1,900
Investments in partially-owned insurance companies	638		638					$ 504
Net unrealized appreciation (depreciation) included in OCI	$ 0	$ 1	$ 4	$ 5
Number of fixed maturities in an unrealized loss position | Security	7,253		7,253
Credit losses recognized in net income for mortgage-backed securities	$ 0	0	$ 0	0
Credit losses recognized in net income for corporate securities	$ 5	$ 6	$ 9	$ 10
Percentage of mortgage-backed securities represented by investments in US government agency bonds	80.00%		80.00%					83.00%
Reinsurance recoverable on losses and loss expenses	$ 11,775		$ 11,775					$ 11,992
Insurance and reinsurance balances payable	4,602		4,602					4,095
Unearned premiums	8,879		8,879					$ 8,222
ABR Reinsurance Capital Holdings Ltd. [Member]
Investment [Line Items]
Equity Method Investment, Ownership Percentage						11.30%
Investments in partially-owned insurance companies						$ 20	$ 70
Warrants & Rights Outstanding							0.50%
Ceded Premiums Written	35		35
Ceded Commissions	11		11
Reinsurance recoverable on losses and loss expenses	5		5
Insurance and reinsurance balances payable	$ 18		$ 18

Investments (Schedule Of Amorti

Investments (Schedule Of Amortized Cost And Fair Value Of Fixed Maturities And Related Other-Than-Temporary Impairment Recognized In Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Investment [Line Items]
Held to maturity, Amortized Cost	$ 8,676	$ 7,331
Held to maturity, Gross Unrealized Appreciation	(209)	(266)
Held to maturity, Gross Unrealized Depreciation	(80)	(8)
Held to maturity, Fair Value	8,805	7,589
Available for sale, Amortized Cost	47,599	47,826
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	1,464	1,871
Available for sale, Gross Unrealized Depreciation	(362)	(302)
Available for sale, Fair Value	48,701	49,395
Available for sale, OTTI recognized in AOCI	(12)	(8)
U.S. Treasury And Agency [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	743	832
Held to maturity, Gross Unrealized Appreciation	(16)	(20)
Held to maturity, Gross Unrealized Depreciation	(1)	(2)
Held to maturity, Fair Value	758	850
Held to maturity, OTTI recognized in AOCI	0	0
Available for sale, Amortized Cost	2,743	2,741
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	67	87
Available for sale, Gross Unrealized Depreciation	(5)	(8)
Available for sale, Fair Value	2,805	2,820
Available for sale, OTTI recognized in AOCI	0	0
Foreign [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	808	916
Held to maturity, Gross Unrealized Appreciation	(39)	(47)
Held to maturity, Gross Unrealized Depreciation	(4)	0
Held to maturity, Fair Value	843	963
Held to maturity, OTTI recognized in AOCI	0	0
Available for sale, Amortized Cost	14,739	14,703
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	529	629
Available for sale, Gross Unrealized Depreciation	(112)	(90)
Available for sale, Fair Value	15,156	15,242
Available for sale, OTTI recognized in AOCI	(5)	0
Corporate Securities [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	3,113	2,323
Held to maturity, Gross Unrealized Appreciation	(72)	(102)
Held to maturity, Gross Unrealized Depreciation	(56)	(2)
Held to maturity, Fair Value	3,129	2,423
Held to maturity, OTTI recognized in AOCI	0	0
Available for sale, Amortized Cost	16,515	16,897
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	534	704
Available for sale, Gross Unrealized Depreciation	(171)	(170)
Available for sale, Fair Value	16,878	17,431
Available for sale, OTTI recognized in AOCI	(6)	(7)
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	1,828	1,983
Held to maturity, Gross Unrealized Appreciation	(50)	(57)
Held to maturity, Gross Unrealized Depreciation	(1)	(1)
Held to maturity, Fair Value	1,877	2,039
Held to maturity, OTTI recognized in AOCI	0	0
Available for sale, Amortized Cost	10,607	10,011
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	237	304
Available for sale, Gross Unrealized Depreciation	(60)	(29)
Available for sale, Fair Value	10,784	10,286
Available for sale, OTTI recognized in AOCI	(1)	(1)
States, Municipalities, And Political Subdivisions [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	2,184	1,277
Held to maturity, Gross Unrealized Appreciation	(32)	(40)
Held to maturity, Gross Unrealized Depreciation	(18)	(3)
Held to maturity, Fair Value	2,198	1,314
Held to maturity, OTTI recognized in AOCI	0	0
Available for sale, Amortized Cost	2,995	3,474
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	97	147
Available for sale, Gross Unrealized Depreciation	(14)	(5)
Available for sale, Fair Value	3,078	3,616
Available for sale, OTTI recognized in AOCI	$ 0	$ 0

Investments (Schedule Of Fixed

Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 1,906	$ 2,187
Available for sale, Due after 1 year through 5 years, Amortized Cost	16,377	15,444
Available for sale, Due after 5 years though 10 years, Amortized Cost	14,321	15,663
Available for sale, Due after 10 years, Amortized Cost	4,388	4,521
Available for sale, Subtotal, Amortized Cost	36,992	37,815
Available for sale, Mortgage-backed securities, Amortized Cost	10,607	10,011
Available for sale, Amortized Cost	47,599	47,826
Available for sale, Fair Value	48,701	49,395
Held to maturity, Due in 1 year or less, Amortized Cost	377	353
Held to maturity, Due after 1 year through 5 years, Amortized Cost	2,589	2,603
Held to maturity, Due after 5 years through 10 years, Amortized Cost	2,351	1,439
Held to maturity, Due after 10 years, Amortized Cost	1,531	953
Held to maturity, Subtotal, Amortized Cost	6,848	5,348
Held to maturity, Mortgage backed securities, Amortized Cost	1,828	1,983
Available for sale, Due in 1 year or less, Fair Value	1,925	2,206
Available for sale, Due after 1 year through 5 years, Fair Value	16,808	15,857
Available for sale, Due after 5 years through 10 years, Fair Value	14,549	16,089
Available for sale, Due after 10 years, Fair Value	4,635	4,957
Available for sale, Subtotal, Fair Value	37,917	39,109
Available for sale, Mortgage backed securities, Fair Value	10,784	10,286
Held to maturity, Due in 1 year or less, Fair Value	381	355
Held to maturity, Due after 1 year through 5, Fair Value	2,685	2,693
Held to maturity, Due after 5 years through 10 years, Fair Value	2,351	1,489
Held to maturity, Due after 10 years, Fair Value	1,511	1,013
Held to maturity, Subtotal, Fair Value	6,928	5,550
Held to maturity, Mortgage backed securities, Fair Value	1,877	2,039
Held to maturity, Amortized Cost	8,676	7,331
Held to maturity, Fair Value	$ 8,805	$ 7,589

Investments (Schedule Of Cost A

Investments (Schedule Of Cost And Fair Value Of Equity Securities) (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Cost	$ 433	$ 440
Gross unrealized appreciation	77	83
Gross unrealized depreciation	(12)	(13)
Fair value	$ 498	$ 510

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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]
OTTI on fixed maturities, gross	$ (13)	$ (9)	$ (26)	$ (15)
OTTI on fixed maturities recognized in OCI (pre-tax)	6	1	6	2
OTTI on fixed maturities, net	(7)	(8)	(20)	(13)
Fixed maturities, Gross realized gains excluding OTTI	28	54	72	90
Fixed maturities, Gross realized losses excluding OTTI	(16)	(26)	(51)	(46)
Total fixed maturities	5	20	1	31
OTTI on equity securities	(1)	(1)	(1)	(7)
Equity securities, Gross realized gains excluding OTTI	30	2	33	4
Equity securities, Gross realized losses excluding OTTI	0	0	(2)	(1)
Total equity securities	29	1	30	(4)
OTTI on other investments	0	(3)	0	(3)
Foreign exchange losses	(40)	(14)	(71)	(23)
Investment and embedded derivative instruments	27	(15)	28	(40)
Fair value adjustments on insurance derivative	104	2	59	(46)
S&P put options and futures	(2)	(72)	(14)	(91)
Other derivative instruments	(1)	9	(1)	7
Other	4	(1)	5	(8)
Total net realized gains (losses) (includes $34, $21, $31, and $27 reclassified from AOCI)	$ 126	$ (73)	$ 37	$ (177)

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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
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	$ 22	$ 35	$ 28	$ 37
Additions where no OTTI was previously recorded	4	5	7	7
Additions where an OTTI was previously recorded	1	1	2	3
Reductions for securities sold during the period	(4)	(17)	(14)	(23)
Balance of credit losses related to securities still held – end of period	$ 23	$ 24	$ 23	$ 24

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	Jun. 30, 2015	Dec. 31, 2014
Investment [Line Items]
Investment securities, Unrealized loss position, 0-12 Months, Fair Value	$ 16,679	$ 8,559
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss	(394)	(244)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value	1,512	3,932
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss	(62)	(79)
Investment securities, Unrealized loss position, Total Fair Value	18,191	12,491
Investment securities, Unrealized loss position, Total Gross Unrealized Loss	(456)	(323)
U.S. Treasury And Agency [Member]
Investment [Line Items]
Investment securities, Unrealized loss position, 0-12 Months, Fair Value	693	350
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss	(5)	(1)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value	137	666
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss	(1)	(9)
Investment securities, Unrealized loss position, Total Fair Value	830	1,016
Investment securities, Unrealized loss position, Total Gross Unrealized Loss	(6)	(10)
Foreign [Member]
Investment [Line Items]
Investment securities, Unrealized loss position, 0-12 Months, Fair Value	3,867	2,262
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss	(104)	(75)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value	273	375
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss	(12)	(15)
Investment securities, Unrealized loss position, Total Fair Value	4,140	2,637
Investment securities, Unrealized loss position, Total Gross Unrealized Loss	(116)	(90)
Corporate Securities [Member]
Investment [Line Items]
Investment securities, Unrealized loss position, 0-12 Months, Fair Value	6,361	4,684
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss	(195)	(150)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value	520	738
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss	(32)	(22)
Investment securities, Unrealized loss position, Total Fair Value	6,881	5,422
Investment securities, Unrealized loss position, Total Gross Unrealized Loss	(227)	(172)
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Investment securities, Unrealized loss position, 0-12 Months, Fair Value	3,430	704
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss	(46)	(2)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value	495	1,663
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss	(15)	(28)
Investment securities, Unrealized loss position, Total Fair Value	3,925	2,367
Investment securities, Unrealized loss position, Total Gross Unrealized Loss	(61)	(30)
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Investment securities, Unrealized loss position, 0-12 Months, Fair Value	2,215	458
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss	(30)	(3)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value	87	490
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss	(2)	(5)
Investment securities, Unrealized loss position, Total Fair Value	2,302	948
Investment securities, Unrealized loss position, Total Gross Unrealized Loss	(32)	(8)
Fixed Maturities [Member]
Investment [Line Items]
Investment securities, Unrealized loss position, 0-12 Months, Fair Value	16,566	8,458
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss	(380)	(231)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value	1,512	3,932
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss	(62)	(79)
Investment securities, Unrealized loss position, Total Fair Value	18,078	12,390
Investment securities, Unrealized loss position, Total Gross Unrealized Loss	(442)	(310)
Equity Securities [Member]
Investment [Line Items]
Investment securities, Unrealized loss position, 0-12 Months, Fair Value	80	101
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss	(12)	(13)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value	0	0
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss	0	0
Investment securities, Unrealized loss position, Total Fair Value	80	101
Investment securities, Unrealized loss position, Total Gross Unrealized Loss	(12)	$ (13)
Other Long-term Investments [Member]
Investment [Line Items]
Investment securities, Unrealized loss position, 0-12 Months, Fair Value	33
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss	(2)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value	0
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss	0
Investment securities, Unrealized loss position, Total Fair Value	33
Investment securities, Unrealized loss position, Total Gross Unrealized Loss	$ (2)

Investments (Schedule Of Compon

Investments (Schedule Of Components Of Restricted Assets) (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Trust funds	$ 11,085	$ 10,838
Deposits with non-U.S. regulatory authorities	2,263	2,305
Assets pledged under repurchase agreements	1,458	1,431
Deposits with U.S. regulatory authorities	1,327	1,345
Other pledged assets	398	457
Total restricted assets	$ 16,531	$ 16,376

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail)	6 Months Ended
	Jun. 30, 2015
Redemption Notice Periods Lower Range [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Notice period for redemption for alternative investments investment funds, days	5 days
Redemption Notice Periods Upper Range [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Notice period for redemption for alternative investments investment funds, days	120 days

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Document Period End Date		Jun. 30, 2015
Available for sale, Fair Value		$ 48,701	$ 49,395
Equity securities, at fair value		498	510
Short-term investments		2,062	2,322
Other investments		3,328	3,346
Securities lending collateral		1,080	1,330
Investment derivative instruments, assets		16	18
Other derivative instruments, assets		23	2
Separate account assets		1,651	1,490
Total assets measured at fair value		57,359	58,413
Investment derivative instruments, liabilities		15	36
Other derivative instruments, liability		3	25
GLB		347	406	[1]
Total liabilities measured at fair value		365	467
Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		1,741	1,680
Equity securities, at fair value		483	492
Short-term investments		1,108	1,183
Other investments		370	370
Securities lending collateral		0	0
Investment derivative instruments, assets		16	18
Other derivative instruments, assets		23	0
Separate account assets		1,567	1,400
Total assets measured at fair value		5,308	5,143
Investment derivative instruments, liabilities		15	36
Other derivative instruments, liability		0	21
GLB	[1]	0	0
Total liabilities measured at fair value		15	57
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		46,682	47,491
Equity securities, at fair value		13	16
Short-term investments		954	1,139
Other investments		279	257
Securities lending collateral		1,080	1,330
Investment derivative instruments, assets		0	0
Other derivative instruments, assets		0	2
Separate account assets		84	90
Total assets measured at fair value		49,092	50,325
Investment derivative instruments, liabilities		0	0
Other derivative instruments, liability		0	0
GLB	[1]	0	0
Total liabilities measured at fair value		0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		278	224
Equity securities, at fair value		2	2
Short-term investments		0	0
Other investments		2,679	2,719
Securities lending collateral		0	0
Investment derivative instruments, assets		0	0
Other derivative instruments, assets		0	0
Separate account assets		0	0
Total assets measured at fair value		2,959	2,945
Investment derivative instruments, liabilities		0	0
Other derivative instruments, liability		3	4
GLB	[1]	347	406
Total liabilities measured at fair value		350	410
U.S. Treasury And Agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		2,805	2,820
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		1,741	1,680
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		1,064	1,140
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		0	0
Foreign [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		15,156	15,242
Foreign [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		0	0
Foreign [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		15,100	15,220
Foreign [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		56	22
Corporate Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		16,878	17,431
Corporate Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		0	0
Corporate Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		16,711	17,244
Corporate Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		167	187
Collateralized Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		10,784	10,286
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		0	0
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		10,729	10,271
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		55	15
States, Municipalities, And Political Subdivisions [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		3,078	3,616
States, Municipalities, And Political Subdivisions [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		0	0
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		3,078	3,616
States, Municipalities, And Political Subdivisions [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		$ 0	$ 0
[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 liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information.

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value And Maximum Future Funding Commitments Related To Investments) (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Minimum [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Liquidation period for financial alternative investments (in years)	5 years	5 years
Liquidation period for real assets alternative investments (in years)	3 years	3 years
Liquidation period for distressed alternative investments (in years)	5 years	5 years
Liquidation period for private credit alternative investments (in years)	3 years	3 years
Liquidation period for traditional alternative investments (in years)	3 years	3 years
Liquidation period for vintage alternative investments (in years)	1 year	1 year
Maximum [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Liquidation period for financial alternative investments (in years)	9 years	9 years
Liquidation period for real assets alternative investments (in years)	7 years	7 years
Liquidation period for distressed alternative investments (in years)	9 years	9 years
Liquidation period for private credit alternative investments (in years)	7 years	7 years
Liquidation period for traditional alternative investments (in years)	9 years	9 years
Liquidation period for vintage alternative investments (in years)	2 years	2 years
Fair Value [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Financial	$ 306	$ 282
Real assets	460	451
Distressed	242	232
Private credit	291	299
Traditional	897	908
Vintage	16	11
Investment funds	306	378
Total of alternative investments	2,518	2,561
Maximum Future Funding Commitments [Member]
Fair Value And Maximum Future Funding Commitments Related To Investments [Line Items]
Financial	124	145
Real assets	177	210
Distressed	252	175
Private credit	234	190
Traditional	224	289
Vintage	0	1
Investment funds	0	0
Total of alternative investments	$ 1,011	$ 1,010

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		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Document Period End Date				Jun. 30, 2015
Valuation Technique	[1]			Actuarial model
Minimum [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Inputs Lapse rate	[1]	1.00%		1.00%
Significant Unobservable Inputs Annuitization rate	[1]			0.00%
Maximum [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Inputs Lapse rate	[1]	30.00%		30.00%
Significant Unobservable Inputs Annuitization rate	[1]			55.00%
Guaranteed Living Benefit [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	[1]	$ 347		$ 347		$ 406
Gain (Loss) on Investments [Member] | Guaranteed Living Benefit [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		(104)	$ (2)	(59)	$ 48
Gain (Loss) on Investments [Member] | Other Long-term Investments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		11	(3)	11	(3)
Gain (Loss) on Investments [Member] | Other Derivative Instruments Fair Value [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		(1)		(1)
Gain (Loss) on Investments [Member] | Short-term Investments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings					0
Gain (Loss) on Investments [Member] | Equity Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		(1)	0	(1)	0
Gain (Loss) on Investments [Member] | Available-for-sale Securities [Member] | Foreign [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	1	0	1
Gain (Loss) on Investments [Member] | Available-for-sale Securities [Member] | Corporate Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	(3)	0
Gain (Loss) on Investments [Member] | Available-for-sale Securities [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Other Income (Expense) [Member] | Guaranteed Living Benefit [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0	0	0	0
Other Income (Expense) [Member] | Other Long-term Investments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		18	43	40	104
Other Income (Expense) [Member] | Other Derivative Instruments Fair Value [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0		0
Other Income (Expense) [Member] | Short-term Investments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0			0
Other Income (Expense) [Member] | Equity Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0	0	0
Other Income (Expense) [Member] | Available-for-sale Securities [Member] | Foreign [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Other Income (Expense) [Member] | Available-for-sale Securities [Member] | Corporate Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0	0	0
Other Income (Expense) [Member] | Available-for-sale Securities [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		$ 0	$ 0	$ 0	$ 0
[1]	Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 4 a) Guaranteed living benefits.

Fair Value Measurements (Fina44

Fair Value Measurements (Financial Instruments Measured At Fair Value Using Significant Unobservable Inputs) (Detail) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014		Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Schedule Of Fair Value Measurements [Line Items]
Document Period End Date					Jun. 30, 2015
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets						$ 0
Equity Securities [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		$ 0	$ 0		$ 0	0
Balance- Beginning of Period, Assets		2	2		2	4
Transfers out of Level 3, Assets		0	0		0	(2)
Change in Net Unrealized Gains (Losses) included in OCI, Assets		0	0		0	1
Purchases, Assets		1	0		1	1
Sales, Assets		0	0		0	(2)
Settlements, Assets		0	0		0
Balance-End of Period, Assets		2	2		2	2
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets		(1)	0		(1)
Equity Securities [Member] | Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		(1)	0		(1)	0
Equity Securities [Member] | Other Income (Expense) [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0	0
Short-term Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3						0
Balance- Beginning of Period, Assets						7
Transfers out of Level 3, Assets						(7)
Change in Net Unrealized Gains (Losses) included in OCI, Assets						0
Purchases, Assets						0
Sales, Assets						0
Balance-End of Period, Assets			0			0
Short-term Investments [Member] | Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings						0
Short-term Investments [Member] | Other Income (Expense) [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0				0
Other Long-term Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	0		0
Balance- Beginning of Period, Assets		2,789	2,611		2,719	2,440
Transfers out of Level 3, Assets		0	0		0
Change in Net Unrealized Gains (Losses) included in OCI, Assets		6	7		(14)	48
Purchases, Assets		52	109		177	248
Sales, Assets		(25)	(2)		(25)	(3)
Settlements, Assets		(172)	(125)		(229)	(194)
Balance-End of Period, Assets		2,679	2,640		2,679	2,640
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets		0	(3)		0	(3)
Other Long-term Investments [Member] | Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		11	(3)		11	(3)
Other Long-term Investments [Member] | Other Income (Expense) [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		18	43		40	104
Other Derivative Instruments Fair Value [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		3			3		$ 4	$ 4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3					0
Transfers out of Level 3, Assets		0
Change in Net Unrealized Gains (Losses) included in OCI, Assets		0
Purchases, Assets		0
Sales, Assets		0
Settlements, Assets		0
Balance-End of Period, Assets		3			3
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities		(1)
Other Derivative Instruments Fair Value [Member] | Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		(1)			(1)
Other Derivative Instruments Fair Value [Member] | Other Income (Expense) [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0			0
Available-for-sale Securities [Member] | Foreign [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		28	2		28	2
Balance- Beginning of Period, Assets		22	26		22	44
Transfers out of Level 3, Assets		0	(16)		0	(34)
Change in Net Unrealized Gains (Losses) included in OCI, Assets		(2)	0		(2)	(1)
Purchases, Assets		8	0		9	2
Sales, Assets		0	(1)		(1)	(2)
Settlements, Assets		0	0		0	0
Balance-End of Period, Assets		56	12		56	12
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets		0	0		0
Available-for-sale Securities [Member] | Foreign [Member] | Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	1		0	1
Available-for-sale Securities [Member] | Foreign [Member] | Other Income (Expense) [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0	0
Available-for-sale Securities [Member] | Corporate Debt Securities [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		12	26		13	30
Balance- Beginning of Period, Assets		167	151		187	166
Transfers out of Level 3, Assets		0	0		0	(22)
Change in Net Unrealized Gains (Losses) included in OCI, Assets		(3)	2		0	2
Purchases, Assets		8	30		16	45
Sales, Assets		(2)	(2)		(5)	(8)
Settlements, Assets		(15)	(3)		(41)	(9)
Balance-End of Period, Assets		167	204		167	204
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets		0	0		(2)
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		(3)	0
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Other Income (Expense) [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0	0
Available-for-sale Securities [Member] | Collateralized Mortgage Backed Securities [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	0		0	0
Balance- Beginning of Period, Assets		33	8		15	8
Transfers out of Level 3, Assets		0	0		0	0
Change in Net Unrealized Gains (Losses) included in OCI, Assets		0	0		0	0
Purchases, Assets		23	0		41	0
Sales, Assets		0	0		0	0
Settlements, Assets		(1)	(1)		(1)	(1)
Balance-End of Period, Assets		55	7		55	7
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets		0	0		0
Available-for-sale Securities [Member] | Collateralized Mortgage Backed Securities [Member] | Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0	0
Available-for-sale Securities [Member] | Collateralized Mortgage Backed Securities [Member] | Other Income (Expense) [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0	0		0	0
Guaranteed Living Benefit [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	[1]	347	241		347	241	$ 451	406	$ 243	$ 193
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0			0	0
Transfers out of Level 3, Assets		0			0	0
Change in Net Unrealized Gains (Losses) included in OCI, Assets		0			0	0
Purchases, Assets		0			0	0
Sales, Assets		0			0	0
Settlements, Assets		0			0	0
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities		(104)	(2)	[1]	(59)	48
Reported liabilities		615	486		615	486		$ 663	$ 483
Guaranteed Living Benefit [Member] | Gain (Loss) on Investments [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		(104)	(2)		(59)	48
Guaranteed Living Benefit [Member] | Other Income (Expense) [Member]
Schedule Of Fair Value Measurements [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		$ 0	$ 0		$ 0	0
Fair Value, Inputs, Level 3 [Member]
Schedule Of Fair Value Measurements [Line Items]
Settlements, Assets						$ 0
[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 liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 for additional information.

Fair Value Measurements (Carryi

Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	$ 8,805	$ 7,589
Investments in partially-owned insurance companies	638	504
Total assets	9,443	8,093
Short-term debt	2,107	2,571
Long-term debt	4,383	3,690
Trust preferred securities	457	462
Total liabilities	6,947	6,723
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	8,676	7,331
Investments in partially-owned insurance companies	638	504
Total assets	9,314	7,835
Short-term debt	2,102	2,552
Long-term debt	4,157	3,357
Trust preferred securities	309	309
Total liabilities	6,568	6,218
Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	583	659
Investments in partially-owned insurance companies	0	0
Total assets	583	659
Short-term debt	0	0
Long-term debt	0	0
Trust preferred securities	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	8,208	6,915
Investments in partially-owned insurance companies	0	0
Total assets	8,208	6,915
Short-term debt	2,107	2,571
Long-term debt	4,383	3,690
Trust preferred securities	457	462
Total liabilities	6,947	6,723
Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	14	15
Investments in partially-owned insurance companies	638	504
Total assets	652	519
Short-term debt	0	0
Long-term debt	0	0
Trust preferred securities	0	0
Total liabilities	0	0
U.S. Treasury And Agency [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	758	850
U.S. Treasury And Agency [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	743	832
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	583	659
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	175	191
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	0	0
Foreign [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	843	963
Foreign [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	808	916
Foreign [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	0	0
Foreign [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	843	963
Foreign [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	0	0
Corporate Debt Securities [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	3,129	2,423
Corporate Debt Securities [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	3,113	2,323
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	3,115	2,408
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	14	15
Collateralized Mortgage Backed Securities [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	1,877	2,039
Collateralized Mortgage Backed Securities [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	1,828	1,983
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	0	0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	1,877	2,039
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	2,198	1,314
US States and Political Subdivisions Debt Securities [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	2,184	1,277
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	2,198	1,314
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities held to maturity, at amortized cost (fair value – $8,805 and $7,589)	$ 0	$ 0

Assumed Life Reinsurance Prog46

Assumed Life Reinsurance Programs Involving Minimum Benefit Guarantees Under Annuity Contracts (Schedule Of Guaranteed Minimum Benefits Income And Expense) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Guaranteed Minimum Benefits [Line Items]
Net premiums earned	$ 4,360	$ 4,332	$ 8,287	$ 8,302
Policy benefits and other reserve adjustments	153	144	295	258
Net realized gains (losses)	126	(73)	37	(177)
Guaranteed Minimum Death Benefit [Member]
Guaranteed Minimum Benefits [Line Items]
Net premiums earned	16	18	32	37
Policy benefits and other reserve adjustments	11	13	20	28
Guaranteed Living Benefit [Member]
Guaranteed Minimum Benefits [Line Items]
Net premiums earned	30	34	62	70
Policy benefits and other reserve adjustments	7	10	19	19
Net realized gains (losses)	104	2	59	(48)
Gain recognized in Net income	127	26	102	3
Less: Net cash received	26	29	54	62
Net (increase) decrease in liability	$ 101	$ (3)	$ 48	$ (59)

Assumed Life Reinsurance Prog47

Assumed Life Reinsurance Programs Involving Minimum Benefit Guarantees Under Annuity Contracts (Narrative) (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014
Guaranteed Minimum Death Benefit [Member]
Guaranteed Minimum Benefits [Line Items]
Reported liabilities	$ 114	$ 111
Guaranteed Living Benefit [Member]
Guaranteed Minimum Benefits [Line Items]
Reported liabilities	615	663	$ 486	$ 483
Fair value derivative adjustment in liability	$ 347	$ 406

Debt (Details)

Debt (Details) - USD ($) $ in Millions	May. 01, 2015	Mar. 01, 2015
Senior Notes [Member] | ACE INA Senior Notes Due March 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 800
Debt Instrument, Interest Rate, Stated Percentage		3.15%
Make Whole Premium Additional Percent		0.15%
ACE INA Senior Notes Due May 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.60%
Long-term Debt, Current Maturities	$ 450

Commitments, Contingencies, A49

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		Jun. 30, 2015	Dec. 31, 2014
Foreign Exchange Future [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		$ 1,309	$ 1,329
Cross Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		95	95
Futures Contracts On Money Market Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		4,355	2,467
Futures contracts on notes and bonds [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		920	1,636
Convertibles and Bonds with Warrants Attached [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[1]	277	267
Investment And Embedded Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Asset		308	309
Notional Value/Payment Provision		6,956	5,794
Single-Stock Future [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[2]	1,286	1,384
Options On Equity Market Indices [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[2]	250	250
Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		401	10
Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		1,937	1,644
Guaranteed Living Benefits [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[3]	786	675
Other Assets [Member] | Foreign Exchange Future [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Asset		6	12
Other Assets [Member] | Futures Contracts On Money Market Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Asset		1	0
Other Assets [Member] | Futures contracts on notes and bonds [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Asset		9	6
Other Assets [Member] | Single-Stock Future [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Asset	[2]	16	0
Other Assets [Member] | Options On Equity Market Indices [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Asset	[2]	0	2
Other Assets [Member] | Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Asset		7	0
Other Assets [Member] | Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Asset		23	2
Other Assets [Member] | Guaranteed Living Benefits [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Asset	[3]		0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Foreign Exchange Future [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Liability		(13)	(7)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Futures Contracts On Money Market Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Liability		(1)	0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Futures contracts on notes and bonds [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Liability		(1)	(29)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Convertibles and Bonds with Warrants Attached [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Liability	[1]	0	0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Investment And Embedded Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Liability		(15)	(36)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Single-Stock Future [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Liability	[2]	0	(21)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Options On Equity Market Indices [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Liability	[2]	0	0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Liability		(3)	(4)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Liability		(3)	(25)
Fixed Maturities Available For Sale [Member] | Convertibles and Bonds with Warrants Attached [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Asset	[1]	292	291
Accounts Payable Future Policy Benefits [Member] | Guaranteed Living Benefits [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value, Liability	[3]	$ (615)	$ (663)
[1]	(1) Includes fair value of embedded derivatives.
[2]	(2) Related to GMDB and GLB blocks of business.
[3]	(3) Includes both future policy benefits reserves and fair value derivative adjustment. Refer to Note 5 for additional information. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts.

Commitments, contingencies, a50

Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Sold under Agreements to Repurchase		$ 1,402	$ 1,402
Assets pledged under repurchase agreements		1,458	1,431
Securities lending collateral		1,080	1,330
Securities lending payable		1,081	$ 1,331
Cash and Cash Equivalents [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		5
U.S. Treasury And Agency [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		238
Collateralized Mortgage Backed Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		1,215
Repurchase Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Secured Borrowings, Gross, Difference, Amount	[1]	56
Overnight and Continuous [Member] | Cash and Cash Equivalents [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral		526
Overnight and Continuous [Member] | Foreign [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral		477
Overnight and Continuous [Member] | Corporate Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral		3
Overnight and Continuous [Member] | U.S. Treasury And Agency [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral		74
30 to 90 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		148
30 to 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
30 to 90 Days [Member] | U.S. Treasury And Agency [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		62
30 to 90 Days [Member] | Collateralized Mortgage Backed Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		86
Greater than 90 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		1,310
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		5
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		176
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		$ 1,129
[1]	Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.

Commitments, Contingencies, A51

Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)		$ 128	$ (76)	$ 72	$ (170)
Foreign Exchange Future [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)		(10)	(1)	15	(4)
All Other Futures Contracts And Options [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)		42	(18)	13	(40)
Convertibles and Bonds with Warrants Attached [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	[1]	(5)	4	0	4
Investment And Embedded Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)		27	(15)	28	(40)
Guaranteed Living Benefits [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	[2]	104	2	59	(46)
Single-Stock Future [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	[3]	(2)	(71)	(13)	(88)
Options On Equity Market Indices [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	[3]	0	(1)	(1)	(3)
Guaranteed Living Benefit And Other Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)		101	(61)	44	(130)
Other Derivatives [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)		$ (1)	$ 9	$ (1)	$ 7
[1]	(1) Includes embedded derivatives.
[2]	(2) Excludes foreign exchange gains (losses) related to GLB
[3]	(3) Related to GMDB and GLB blocks of business.

Commitments, Contingencies, A52

Commitments, Contingencies, And Guarantees (Narrative) (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities lending collateral	$ 1,080	$ 1,330
Carrying value of limited partnerships and partially-owned investment companies included in other investments	2,200
Funding commitments relating to limited partnerships and partially-owned investment companies	1,000
Unrecognized tax benefits	23
Derivative liability subject to a master netting agreement	19	$ 34
Cash and Cash Equivalents [Member] | Overnight and Continuous [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities lending collateral	526
Foreign [Member] | Overnight and Continuous [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities lending collateral	477
U.S. Treasury And Agency [Member] | Overnight and Continuous [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities lending collateral	74
Corporate Securities [Member] | Overnight and Continuous [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities lending collateral	3
Securities Lending Program [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Secured Borrowings, Gross, Difference, Amount	$ 1

Shareholders' equity Sharehol53

Shareholders' equity Shareholders' equity (Details) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2015USD ($)$ / sharesshares	Jun. 30, 2015USD ($)SFr / sharesshares	Jun. 30, 2014USD ($)$ / sharesshares	Jun. 30, 2014USD ($)SFr / shares	Jun. 30, 2015USD ($)$ / sharesshares	Jun. 30, 2015USD ($)SFr / sharesshares	Jun. 30, 2014USD ($)$ / sharesshares	Jun. 30, 2014USD ($)SFr / shares	Jun. 30, 2013$ / shares	Jun. 30, 2015SFr / shares	May. 31, 2015$ / shares	Jan. 01, 2015USD ($)	Dec. 31, 2014SFr / sharesshares	May. 31, 2014$ / shares	Nov. 30, 2013USD ($)	May. 31, 2013$ / shares
Equity, Class of Treasury Stock [Line Items]
Common Shares in treasury, shares | shares	19,018,131	19,018,131			19,018,131	19,018,131							14,172,726
Par Value Reduction | (per share)	$ 0	SFr 0	$ 0.65	SFr 0.58	$ 0.65	SFr 0.62	$ 1.16	SFr 1.03
Dividends Declared From Additional Paid In Capital | (per share)	0.67	0.62	0	0	0.67	0.62	0.24	0.20
Annual dividend per share approved by shareholders | $ / shares											$ 2.68			$ 2.60		$ 2.04
Increase to dividend approved by shareholders in January | $ / shares							0.12
Dividends declared per common share | (per share)	0.67	SFr 0.62	$ 0.65	SFr 0.58	1.32	SFr 1.24	1.40	SFr 1.23
Common Stock, Dividend Rate, Per-Dollar-Amount | $ / shares	$ 0.65				$ 0.67				$ 0.51
Common Stock, Dividend Rate, Per-Dollar-Amount After Increase | $ / shares							$ 0.63
Common Shares, par value | SFr / shares										SFr 24.15			SFr 24.77
2015 Stock Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Common Shares repurchased	$ 394				$ 734
Repurchase of outstanding common shares, shares | shares	3,650,200				6,677,663
Share repurchase authorization remains	$ 766	SFr 766			$ 766	SFr 766
Stock repurchase program, authorized amount												$ 1,500
November 2013 Stock Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Common Shares repurchased			$ 237				$ 569
Repurchase of outstanding common shares, shares | shares			2,306,000				5,793,882
Share repurchase authorization remains			$ 1,374	SFr 1,374			$ 1,374	SFr 1,374
Stock repurchase program, authorized amount															$ 2,000

Share-Based Compensation (Detai

Share-Based Compensation (Detail) - $ / shares	Feb. 26, 2015	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period in years		3 years
Stock option term in years		10 years
Restricted stock award and units vesting period in years		4 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	1,891,195
Weighted-average grant date fair value for stock options granted	$ 18.49
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted to employees and officers of the company	1,278,250
Grant date fair value of awards except for options granted to employees and officers of the company	$ 114.78
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	290,475
Grant date fair value of awards except for options granted to employees and officers of the company	$ 114.78

Segment Information (Operations

Segment Information (Operations By Segment) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net premiums written	$ 4,784	$ 4,559	$ 8,860	$ 8,744
Net premiums earned	4,360	4,332	8,287	8,302
Losses and loss expenses	2,417	2,388	4,539	4,549
Policy benefits	153	144	295	258
Policy acquisition costs	727	758	1,434	1,486
Administrative expenses	578	566	1,132	1,101
Underwriting income (loss)	485	476	887	908
Net investment income	562	556	1,113	1,109
Net realized gains (losses) including OTTI	126	(73)	37	(177)
Interest expense	71	72	139	143
(Gains) losses from fair value changes in separate account assets	(6)	(17)	(17)	(11)
Other	23	(8)	29	(31)
Other (income) expense	17	(25)	12	(42)
Income tax expense (benefit)	143	133	263	226
Net income (loss)	942	779	1,623	1,513
Insurance - North American P&C [Member]
Segment Reporting Information [Line Items]
Net premiums written	1,975	1,635	3,405	3,053
Net premiums earned	1,688	1,542	3,214	3,029
Losses and loss expenses	1,120	1,016	2,155	1,956
Policy acquisition costs	130	152	291	311
Administrative expenses	189	175	360	336
Underwriting income (loss)	249	199	408	426
Net investment income	269	265	532	535
Net realized gains (losses) including OTTI	0	(11)	(6)	(20)
Interest expense	2	2	4	5
Other	23	(24)	16	(44)
Income tax expense (benefit)	89	91	169	174
Net income (loss)	404	384	745	806
Insurance - North American Agriculture [Member]
Segment Reporting Information [Line Items]
Underwriting Income Including Losses Related to Crop Derivatives	21
Net premiums written	379	388	467	582
Net premiums earned	321	330	385	433
Losses and loss expenses	271	287	293	413
Policy acquisition costs	23	23	19	28
Administrative expenses	4	1	3	2
Underwriting income (loss)	23	19	70	(10)
Net investment income	6	6	12	13
Net realized gains (losses) including OTTI	(2)	8	(2)	6
Interest expense	0	0	0	0
Other	8	9	16	17
Income tax expense (benefit)	4	5	14	(2)
Net income (loss)	15	19	50	(6)
Crop Derivative Gain or Loss	2
Insurance - Overseas General [Member]
Segment Reporting Information [Line Items]
Net premiums written	1,669	1,760	3,463	3,531
Net premiums earned	1,644	1,709	3,281	3,321
Losses and loss expenses	816	830	1,630	1,647
Policy acquisition costs	396	402	785	788
Administrative expenses	254	256	510	506
Underwriting income (loss)	178	221	356	380
Net investment income	139	136	277	268
Net realized gains (losses) including OTTI	13	14	3	4
Interest expense	1	1	2	2
Other	8	8	25	2
Income tax expense (benefit)	69	55	121	92
Net income (loss)	252	307	488	556
Global Reinsurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	261	278	534	586
Net premiums earned	220	261	446	545
Losses and loss expenses	72	109	171	235
Policy acquisition costs	60	60	114	127
Administrative expenses	13	14	25	28
Underwriting income (loss)	75	78	136	155
Net investment income	79	80	154	157
Net realized gains (losses) including OTTI	5	(15)	(6)	(23)
Interest expense	1	2	2	3
Other	(3)	(10)	(8)	(29)
Income tax expense (benefit)	7	10	15	20
Net income (loss)	154	141	275	295
Life [Member]
Segment Reporting Information [Line Items]
Life underwriting income	77
Net premiums written	500	498	991	992
Net premiums earned	487	490	961	974
Losses and loss expenses	137	146	289	297
Policy benefits	153	144	295	258
Policy acquisition costs	118	121	225	232
Administrative expenses	74	73	147	141
Underwriting income (loss)	5	6	5	46
Net investment income	66	66	132	130
Net realized gains (losses) including OTTI	103	(72)	44	(148)
Interest expense	2	3	3	6
(Gains) losses from fair value changes in separate account assets	(6)	(17)	(17)	(11)
Other	(17)	4	(29)	11
Income tax expense (benefit)	10	12	19	22
Net income (loss)	185	(2)	205	0
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Losses and loss expenses	1	0	1	1
Policy acquisition costs		0		0
Administrative expenses	44	47	87	88
Underwriting income (loss)	(45)	(47)	(88)	(89)
Net investment income	3	3	6	6
Net realized gains (losses) including OTTI	7	3	4	4
Interest expense	65	64	128	127
Other	4	5	9	12
Income tax expense (benefit)	(36)	(40)	(75)	(80)
Net income (loss)	$ (68)	$ (70)	$ (140)	$ (138)

Segment Information (Net Premiu

Segment Information (Net Premiums Earned For Segment By Product) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Property & All Other	$ 1,659	$ 1,612	$ 2,978	$ 2,967
Casualty	1,588	1,542	3,094	3,022
Life, Accident & Health	1,113	1,178	2,215	2,313
Net premiums earned	4,360	4,332	8,287	8,302
Insurance - North American P&C [Member]
Segment Reporting Information [Line Items]
Net premiums earned	1,688	1,542	3,214	3,029
Insurance - North American P&C [Member] | Property Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	507	423	917	828
Insurance - North American P&C [Member] | Casualty Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	1,079	1,018	2,094	1,999
Insurance - North American P&C [Member] | Life Accident And Health Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	102	101	203	202
Insurance - North American Agriculture [Member]
Segment Reporting Information [Line Items]
Net premiums earned	321	330	385	433
Insurance - North American Agriculture [Member] | Property Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	321	330	385	433
Insurance - North American Agriculture [Member] | Casualty Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	0	0	0	0
Insurance - North American Agriculture [Member] | Life Accident And Health Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	0	0	0	0
Insurance - Overseas General [Member]
Segment Reporting Information [Line Items]
Net premiums earned	1,644	1,709	3,281	3,321
Insurance - Overseas General [Member] | Property Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	729	727	1,457	1,420
Insurance - Overseas General [Member] | Casualty Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	391	395	773	764
Insurance - Overseas General [Member] | Life Accident And Health Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	524	587	1,051	1,137
Global Reinsurance [Member]
Segment Reporting Information [Line Items]
Net premiums earned	220	261	446	545
Global Reinsurance [Member] | Property Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	102	132	219	286
Global Reinsurance [Member] | Casualty Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	118	129	227	259
Global Reinsurance [Member] | Life Accident And Health Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	0	0	0	0
Life [Member]
Segment Reporting Information [Line Items]
Net premiums earned	487	490	961	974
Life [Member] | Property Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	0	0	0	0
Life [Member] | Casualty Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	0	0	0	0
Life [Member] | Life Accident And Health Product Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	$ 487	$ 490	$ 961	$ 974

Earnings Per Share (Detail)

Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 942	$ 779	$ 1,623	$ 1,513
Weighted-average shares outstanding	325,463,196	337,846,228	326,795,838	338,353,260
Share-based compensation plans	3,222,562	3,286,359	3,373,809	3,267,499
Weighted-average shares outstanding and assumed conversions	328,685,758	341,132,587	330,169,647	341,620,759
Basic earnings per share (US$ per share)	$ 2.89	$ 2.30	$ 4.97	$ 4.47
Diluted earnings per share (US$ per share)	$ 2.86	$ 2.28	$ 4.91	$ 4.43
Potential anti-dilutive share conversions	1,934,454	1,778,040	1,306,817	1,220,731

Information Provided In Conne58

Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Detail) - USD ($) $ in Millions	Jun. 30, 2015		Dec. 31, 2014		Jun. 30, 2014		Dec. 31, 2013	[4]
Condensed Financial Statements, Captions [Line Items]
Investments	$ 63,265		$ 62,904
Cash	790	[1],[2]	655	[1],[3]	$ 594	[4]	$ 579
Insurance and reinsurance balances receivable	5,757		5,426
Reinsurance recoverable on losses and loss expenses	11,775		11,992
Reinsurance recoverable on policy benefits	203		217
Value of business acquired	434		466
Goodwill and other intangible assets	5,969		5,724
Investments in subsidiaries	0		0
Due from subsidiaries and affiliates, net	0		0
Other assets	11,647		10,864
Total assets	99,840		98,248
Unpaid losses and loss expenses	38,230		38,315
Unearned premiums	8,879		8,222
Future policy benefits	4,835		4,754
Due to subsidiaries and affiliates, net	0		0
Short-term debt	2,102		2,552
Affiliated notional cash pooling programs	0		0
Long-term debt	4,157		3,357
Trust preferred securities	309		309
Other liabilities	11,773		11,152
Total liabilities	70,285		68,661
Total shareholders' equity	29,555		29,587		30,325
Total liabilities and shareholders’ equity	99,840		98,248
ACE Limited (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Investments	32		30
Cash	1	[1],[2]	0	[1],[3]	44	[4]	0
Insurance and reinsurance balances receivable	0		0
Reinsurance recoverable on losses and loss expenses	0		0
Reinsurance recoverable on policy benefits	0		0
Value of business acquired	0		0
Goodwill and other intangible assets	0		0
Investments in subsidiaries	29,806		29,497
Due from subsidiaries and affiliates, net	370		583
Other assets	5		4
Total assets	30,214		30,114
Unpaid losses and loss expenses	0		0
Unearned premiums			0
Future policy benefits	0		0
Due to subsidiaries and affiliates, net	0		0
Short-term debt	0		0
Affiliated notional cash pooling programs	386	[2]	246	[3]
Long-term debt	0		0
Trust preferred securities	0		0
Other liabilities	273		281
Total liabilities	659		527
Total shareholders' equity	29,555		29,587
Total liabilities and shareholders’ equity	30,214		30,114
ACE INA Holdings Inc (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Investments	35		225
Cash	3	[1],[2]	1	[1],[3]	1	[4]	16
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	18,747		18,762
Due from subsidiaries and affiliates, net	0		0
Other assets	381		295
Total assets	19,166		19,283
Unpaid losses and loss expenses	0		0
Unearned premiums			0
Future policy benefits	0		0
Due to subsidiaries and affiliates, net	245		422
Short-term debt	700		1,150
Affiliated notional cash pooling programs	37	[2]	309	[3]
Long-term debt	4,145		3,345
Trust preferred securities	309		309
Other liabilities	1,499		1,404
Total liabilities	6,935		6,939
Total shareholders' equity	12,231		12,344
Total liabilities and shareholders’ equity	19,166		19,283
Other ACE Limited Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Investments	63,198		62,649
Cash	1,209	[1],[2]	1,209	[1],[3]	1,026	[4]	748
Insurance and reinsurance balances receivable	6,726		6,178
Reinsurance recoverable on losses and loss expenses	20,619		20,992
Reinsurance recoverable on policy benefits	1,192		1,194
Value of business acquired	434		466
Goodwill and other intangible assets	5,969		5,724
Investments in subsidiaries	0		0
Due from subsidiaries and affiliates, net	0		0
Other assets	15,026		14,196
Total assets	114,373		112,608
Unpaid losses and loss expenses	46,596		46,770
Unearned premiums	10,718		9,958
Future policy benefits	5,824		5,731
Due to subsidiaries and affiliates, net	125		161
Short-term debt	1,402		1,402
Affiliated notional cash pooling programs	0	[2]	0	[3]
Long-term debt	12		12
Trust preferred securities	0		0
Other liabilities	13,374		12,659
Total liabilities	78,051		76,693
Total shareholders' equity	36,322		35,915
Total liabilities and shareholders’ equity	114,373		112,608
Consolidating Adjustments and Eliminations
Condensed Financial Statements, Captions [Line Items]
Investments	0		0
Cash	(423)	[1],[2]	(555)	[1],[3]	$ (477)	[4]	$ (185)
Insurance and reinsurance balances receivable	(969)		(752)
Reinsurance recoverable on losses and loss expenses	(8,844)		(9,000)
Reinsurance recoverable on policy benefits	(989)		(977)
Value of business acquired	0		0
Goodwill and other intangible assets	0		0
Investments in subsidiaries	(48,553)		(48,259)
Due from subsidiaries and affiliates, net	(370)		(583)
Other assets	(3,765)		(3,631)
Total assets	(63,913)		(63,757)
Unpaid losses and loss expenses	(8,366)		(8,455)
Unearned premiums	(1,839)		(1,736)
Future policy benefits	(989)		(977)
Due to subsidiaries and affiliates, net	(370)		(583)
Short-term debt	0		0
Affiliated notional cash pooling programs	(423)	[2]	(555)	[3]
Long-term debt	0		0
Trust preferred securities	0		0
Other liabilities	(3,373)		(3,192)
Total liabilities	(15,360)		(15,498)
Total shareholders' equity	(48,553)		(48,259)
Total liabilities and shareholders’ equity	$ (63,913)		$ (63,757)
[1]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[4]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2014 and December 31, 2013, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Information Provided In Conne59

Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	$ 4,784	$ 4,559	$ 8,860	$ 8,744
Net premiums earned	4,360	4,332	8,287	8,302
Net investment income	562	556	1,113	1,109
Equity in earnings of subsidiaries	0	0	0	0
Net realized gains (losses) including OTTI	126	(73)	37	(177)
Losses and loss expenses	2,417	2,388	4,539	4,549
Policy benefits	153	144	295	258
Policy acquisition costs and administrative expenses	1,305	1,324	2,566	2,587
Interest (income) expense	71	72	139	143
Other (income) expense	17	(25)	12	(42)
Income tax expense (benefit)	143	133	263	226
Net income (loss)	942	779	1,623	1,513
Comprehensive income (loss)	397	1,348	1,039	2,456
ACE Limited (Parent Guarantor)
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	0	0	0	0
Net premiums earned	0	0	0	0
Net investment income	0	1	1	1
Equity in earnings of subsidiaries	901	745	1,549	1,447
Net realized gains (losses) including OTTI	0	0	0	0
Losses and loss expenses	0	0	0	0
Policy benefits	0	0	0	0
Policy acquisition costs and administrative expenses	18	22	32	39
Interest (income) expense	(7)	(9)	(15)	(19)
Other (income) expense	(57)	(50)	(98)	(92)
Income tax expense (benefit)	5	4	8	7
Net income (loss)	942	779	1,623	1,513
Comprehensive income (loss)	397	1,348	1,039	2,456
ACE INA Holdings Inc (Subsidiary Issuer)
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	0	0	0	0
Net premiums earned	0	0	0	0
Net investment income	0	1	1	1
Equity in earnings of subsidiaries	296	231	500	411
Net realized gains (losses) including OTTI	(2)	8	(2)	7
Losses and loss expenses	0	0	0	0
Policy benefits	0	0	0	0
Policy acquisition costs and administrative expenses	7	8	13	14
Interest (income) expense	69	70	138	141
Other (income) expense	(4)	6	(7)	20
Income tax expense (benefit)	(27)	(25)	(53)	(55)
Net income (loss)	249	181	408	299
Comprehensive income (loss)	(91)	511	(67)	777
Other ACE Limited Subsidiaries
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	4,784	4,559	8,860	8,744
Net premiums earned	4,360	4,332	8,287	8,302
Net investment income	562	554	1,111	1,107
Equity in earnings of subsidiaries	0	0	0	0
Net realized gains (losses) including OTTI	128	(81)	39	(184)
Losses and loss expenses	2,417	2,388	4,539	4,549
Policy benefits	153	144	295	258
Policy acquisition costs and administrative expenses	1,280	1,294	2,521	2,534
Interest (income) expense	9	11	16	21
Other (income) expense	78	19	117	30
Income tax expense (benefit)	165	154	308	274
Net income (loss)	948	795	1,641	1,559
Comprehensive income (loss)	403	1,364	1,057	2,502
Consolidating Adjustments and Eliminations
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net premiums written	0	0	0	0
Net premiums earned	0	0	0	0
Net investment income	0	0	0	0
Equity in earnings of subsidiaries	(1,197)	(976)	(2,049)	(1,858)
Net realized gains (losses) including OTTI	0	0	0	0
Losses and loss expenses	0	0	0	0
Policy benefits	0	0	0	0
Policy acquisition costs and administrative expenses	0	0	0	0
Interest (income) expense	0	0	0	0
Other (income) expense	0	0	0	0
Income tax expense (benefit)	0	0	0	0
Net income (loss)	(1,197)	(976)	(2,049)	(1,858)
Comprehensive income (loss)	$ (312)	$ (1,875)	$ (990)	$ (3,279)

Information Provided In Conne60

Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	$ 1,891		$ 2,096
Purchases of fixed maturities available for sale	(9,210)		(7,960)
Purchases of fixed maturities held to maturity	(24)		(129)
Purchases of equity securities	(70)		(64)
Sales of fixed maturities available for sale	3,642		3,842
Sales of equity securities	102		45
Maturities and redemptions of fixed maturities available for sale	3,691		3,163
Maturities and redemptions of fixed maturities held to maturity	470		414
Net change in short-term investments	228		(295)
Net derivative instruments settlements	(33)		(185)
Cash Acquired from Acquisition	620		4
Payments to Acquire Businesses, Net of Cash Acquired	255		(172)
Other	(71)		(118)
Net cash flows used for investing activities	(1,020)		(1,459)
Dividends paid on Common Shares	(427)		(428)
Common Shares repurchased	(750)		(557)
Proceeds from issuance of long-term debt	800		699
Proceeds from issuance of short-term debt	1,327		977
Repayments of Long-term Debt	(450)		(500)
Repayments of Short-term Debt	(1,327)		(977)
Proceeds from share-based compensation plans, including windfall tax benefits	46		75
Advances To From Affiliates Financing Activities	0		0
Net proceeds from (payments to) affiliated notional cash pooling program	0		0
Policyholder contract deposits	235		125
Policyholder contract withdrawals	(107)		(33)
Other	(6)		(6)
Net cash flows (used for) from financing activities	(659)		(625)
Effect of foreign currency rate changes on cash and cash equivalents	(77)		3
Net increase in cash	135		15
Cash – beginning of period	655	[1],[2]	579	[3]
Cash – end of period	790	[2],[4]	594	[3]
ACE Limited (Parent Guarantor)
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	65		83
Purchases of fixed maturities available for sale	0		0
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Sales of fixed maturities available for sale	0		0
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	0		0
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	0		(1)
Net derivative instruments settlements	0		0
Payments to Acquire Businesses, Net of Cash Acquired			0
Other	0		0
Net cash flows used for investing activities	0		(1)
Dividends paid on Common Shares	(427)		(428)
Common Shares repurchased	0		0
Proceeds from issuance of long-term debt	0
Proceeds from issuance of short-term debt	0
Repayments of Long-term Debt			0
Repayments of Short-term Debt	0		0
Proceeds from share-based compensation plans, including windfall tax benefits	0		0
Advances To From Affiliates Financing Activities	223		575
Net proceeds from (payments to) affiliated notional cash pooling program	140	[2]	(185)	[3]
Policyholder contract deposits	0		0
Policyholder contract withdrawals	0		0
Other	0		0
Net cash flows (used for) from financing activities	(64)		(38)
Effect of foreign currency rate changes on cash and cash equivalents	0		0
Net increase in cash	1		44
Cash – beginning of period	0	[1],[2]	0	[3]
Cash – end of period	1	[2],[4]	44	[3]
ACE INA Holdings Inc (Subsidiary Issuer)
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	(35)		(7)
Purchases of fixed maturities available for sale	0		0
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Sales of fixed maturities available for sale	0		0
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	0		0
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	190		(1)
Net derivative instruments settlements	(9)		(7)
Payments to Acquire Businesses, Net of Cash Acquired	0		0
Other	(2)		(3)
Net cash flows used for investing activities	179		(11)
Dividends paid on Common Shares	0		0
Common Shares repurchased	0		0
Proceeds from issuance of long-term debt	800		699
Proceeds from issuance of short-term debt	0
Repayments of Long-term Debt	(450)		(500)
Repayments of Short-term Debt	0		0
Proceeds from share-based compensation plans, including windfall tax benefits	0		0
Advances To From Affiliates Financing Activities	(214)		(667)
Net proceeds from (payments to) affiliated notional cash pooling program	(272)	[2]	477	[3]
Policyholder contract deposits	0		0
Policyholder contract withdrawals	0		0
Other	(6)		(6)
Net cash flows (used for) from financing activities	(142)		3
Effect of foreign currency rate changes on cash and cash equivalents	0		0
Net increase in cash	2		(15)
Cash – beginning of period	1	[1],[2]	16	[3]
Cash – end of period	3	[2],[4]	1	[3]
Other ACE Limited Subsidiaries
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	1,861		2,020
Purchases of fixed maturities available for sale	(9,210)		(7,963)
Purchases of fixed maturities held to maturity	(24)		(129)
Purchases of equity securities	(70)		(64)
Sales of fixed maturities available for sale	3,642		3,845
Sales of equity securities	102		45
Maturities and redemptions of fixed maturities available for sale	3,691		3,163
Maturities and redemptions of fixed maturities held to maturity	470		414
Net change in short-term investments	38		(293)
Net derivative instruments settlements	(24)		(178)
Payments to Acquire Businesses, Net of Cash Acquired	255		(172)
Other	(69)		(115)
Net cash flows used for investing activities	(1,199)		(1,447)
Dividends paid on Common Shares	0		0
Common Shares repurchased	(750)		(557)
Proceeds from issuance of long-term debt	0
Proceeds from issuance of short-term debt	1,327		977
Repayments of Long-term Debt			0
Repayments of Short-term Debt	(1,327)		(977)
Proceeds from share-based compensation plans, including windfall tax benefits	46		75
Advances To From Affiliates Financing Activities	(9)		92
Net proceeds from (payments to) affiliated notional cash pooling program	0	[2]	0	[3]
Policyholder contract deposits	235		125
Policyholder contract withdrawals	(107)		(33)
Other	0		0
Net cash flows (used for) from financing activities	(585)		(298)
Effect of foreign currency rate changes on cash and cash equivalents	(77)		3
Net increase in cash	0		278
Cash – beginning of period	1,209	[1],[2]	748	[3]
Cash – end of period	1,209	[2],[4]	1,026	[3]
Consolidating Adjustments and Eliminations
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]
Net cash flows from operating activities	0		0
Purchases of fixed maturities available for sale	0		3
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Sales of fixed maturities available for sale	0		(3)
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	0		0
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	0		0
Net derivative instruments settlements	0		0
Payments to Acquire Businesses, Net of Cash Acquired	0		0
Other	0		0
Net cash flows used for investing activities	0		0
Dividends paid on Common Shares	0		0
Common Shares repurchased	0		0
Proceeds from issuance of long-term debt	0
Proceeds from issuance of short-term debt	0
Repayments of Long-term Debt			0
Repayments of Short-term Debt	0		0
Proceeds from share-based compensation plans, including windfall tax benefits	0		0
Advances To From Affiliates Financing Activities	0		0
Net proceeds from (payments to) affiliated notional cash pooling program	132	[2]	(292)	[3]
Policyholder contract deposits	0		0
Policyholder contract withdrawals	0		0
Other	0		0
Net cash flows (used for) from financing activities	132		(292)
Effect of foreign currency rate changes on cash and cash equivalents	0		0
Net increase in cash	132		(292)
Cash – beginning of period	(555)	[1],[2]	(185)	[3]
Cash – end of period	$ (423)	[2],[4]	$ (477)	[3]
[1]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2014 and December 31, 2013, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[4]	ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.