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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]    
Net cash flows from operating activities $ 1,808 $ 1,383
Purchases of fixed maturities available for sale (10,941) (11,687)
Purchases of fixed maturities held to maturity (299) (136)
Purchases of equity securities (194) (93)
Sales of fixed maturities available for sale 5,396 8,032
Sales of equity securities 62 33
Maturities and redemptions of fixed maturities available for sale 4,112 2,280
Maturities and redemptions of fixed maturities held to maturity 908 739
Net derivative instruments settlements (317) (133)
Acquisition of subsidiaries (977) (30)
Other (126) (255)
Net cash flows used for investing activities (2,376) (1,250)
Dividends paid on Common Shares (169) (318)
Common Shares repurchased (212) (11)
Proceeds from issuance of long-term debt 947 0
Net proceeds from (repayments) issuance of short-term debt   151
Proceeds from share-based compensation plans, including windfall tax benefits 62 55
Other 30 0
Net cash flows from financing activities 658 (123)
Effect of foreign currency rate changes on cash and cash equivalents (26) (7)
Net increase (decrease) in cash 64 3
Cash - beginning of period 615 [1] 614
Cash - end of period 679 [2] 617
Parent Company [Member]
    
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]    
Net cash flows from operating activities 95 49
Sales of fixed maturities available for sale   0
Net derivative instruments settlements 0 (1)
Advances from (to) affiliates (429) 131
Payment Of Contributions To Subsidiary (119)  
Net cash flows used for investing activities (548) 130
Dividends paid on Common Shares (169) (318)
Net proceeds from (repayments) issuance of short-term debt   0
Proceeds from share-based compensation plans, including windfall tax benefits 6 3
Net cash flows from financing activities (163) (315)
Net increase (decrease) in cash (616) (136)
Cash - beginning of period 103 [1] 106
Cash - end of period (513) [2] (30)
Guarantor Subsidiaries [Member]
    
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]    
Net cash flows from operating activities 876 540
Purchases of fixed maturities available for sale (6,604) (5,614)
Purchases of fixed maturities held to maturity (284) (134)
Purchases of equity securities (161) (57)
Sales of fixed maturities available for sale 3,571 3,750
Sales of equity securities 51 28
Maturities and redemptions of fixed maturities available for sale 1,839 1,158
Maturities and redemptions of fixed maturities held to maturity 613 527
Net derivative instruments settlements 10 (6)
Acquisition of subsidiaries (977) (30)
Other (154) (140)
Net cash flows used for investing activities (2,096) (518)
Proceeds from issuance of long-term debt 947  
Net proceeds from (repayments) issuance of short-term debt   0
Proceeds from share-based compensation plans, including windfall tax benefits (4) [3]  
Advances (to) from affiliates 352 23
Capital contribution 0 90
Other 30  
Net cash flows from financing activities 1,325 113
Effect of foreign currency rate changes on cash and cash equivalents (37) (9)
Net increase (decrease) in cash 68 126
Cash - beginning of period 515 [1] 382
Cash - end of period 583 [2] 508
Other Ace Limited Subsidiaries And Eliminations [Member]
    
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]    
Net cash flows from operating activities 837 [3] 794 [3]
Purchases of fixed maturities available for sale (4,337) [3] (6,073) [3]
Purchases of fixed maturities held to maturity (15) [3] (2) [3]
Purchases of equity securities (33) [3] (36) [3]
Sales of fixed maturities available for sale 1,825 [3] 4,282 [3]
Sales of equity securities 11 [3] 5 [3]
Maturities and redemptions of fixed maturities available for sale 2,273 [3] 1,122 [3]
Maturities and redemptions of fixed maturities held to maturity 295 [3] 212 [3]
Net derivative instruments settlements (327) [3] (126) [3]
Acquisition of subsidiaries 0 [3] 0 [3]
Payment Of Contributions To Subsidiary 0 [3] (90) [3]
Other 28 [3] (115) [3]
Net cash flows used for investing activities (280) [3] (821) [3]
Dividends paid on Common Shares 0 [3]  
Common Shares repurchased (212) [3] (11) [3]
Net proceeds from (repayments) issuance of short-term debt   151 [3]
Proceeds from share-based compensation plans, including windfall tax benefits 60 [3] 52 [3]
Advances (to) from affiliates 77 [3] (154) [3]
Capital contribution 119 [3]  
Net cash flows from financing activities 44 [3] 38 [3]
Effect of foreign currency rate changes on cash and cash equivalents 11 [3] 2 [3]
Net increase (decrease) in cash 612 [3] 13 [3]
Cash - beginning of period (3) [1],[3],[4] 126 [3]
Cash - end of period 609 [2],[3],[4] 139 [3]
Consolidation, Eliminations [Member]
    
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]    
Advances from (to) affiliates 429 [5] (131) [5]
Payment Of Contributions To Subsidiary 119 [5] 90 [5]
Net cash flows used for investing activities 548 [5] (41) [5]
Advances (to) from affiliates (429) [5] 131 [5]
Capital contribution (119) [5] (90) [5]
Net cash flows from financing activities $ (548) [5] $ 41 [5]
[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, 2012, 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, 2013, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3] Includes all other subsidiaries of ACE Limited and intercompany eliminations.
[4] Includes all other subsidiaries of ACE Limited and intercompany eliminations, primarily intercompany reinsurance transactions.
[5] Includes ACE Limited parent company eliminations and certain consolidating adjustments.