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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]        
Net premiums written $ 4,130 $ 3,953 $ 7,702 $ 7,399
Net premiums earned 3,783 3,757 7,164 7,066
Net investment income 537 569 1,081 1,113
Net realized gains (losses) including OTTI (394) (73) (134) (118)
Losses and loss expenses 2,119 2,226 3,923 4,489
Policy benefits 102 108 249 199
Policy acquisition costs and administrative expenses 1,133 1,130 2,225 2,188
Interest (income) expense 62 62 124 125
Other (income) expense 34 12 31 (1)
Income tax expense 148 121 258 217
Net income 328 594 1,301 844
Comprehensive income 457 801 1,728 1,239
Parent Company [Member]
       
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]        
Net investment income 1   1 1
Equity in earnings of subsidiaries 301 566 1,229 805
Net realized gains (losses) including OTTI 2 (1) 22 (2)
Policy acquisition costs and administrative expenses 14 18 26 36
Interest (income) expense (8) (10) (17) (18)
Other (income) expense (33) (40) (63) (62)
Income tax expense 3 3 5 4
Net income 328 594 1,301 844
Comprehensive income 457 801 1,728 1,239
Guarantor Subsidiaries [Member]
       
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]        
Net premiums written 2,327 2,306 4,425 4,329
Net premiums earned 2,196 2,225 4,148 4,163
Net investment income 257 282 522 544
Net realized gains (losses) including OTTI 34 17 60 4
Losses and loss expenses 1,325 1,438 2,507 2,739
Policy benefits 54 59 140 99
Policy acquisition costs and administrative expenses 656 620 1,296 1,208
Interest (income) expense 58 66 124 133
Other (income) expense 9 23 34 36
Income tax expense 119 109 204 177
Net income 266 209 425 319
Comprehensive income 323 382 610 592
Other ACE Limited Subsidiaries And Eliminations [Member]
       
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]        
Net premiums written 1,803 [1] 1,647 [1] 3,277 3,070 [1]
Net premiums earned 1,587 [1] 1,532 [1] 3,016 2,903 [1]
Net investment income 279 [1] 287 [1] 558 568 [1]
Net realized gains (losses) including OTTI (430) [1] (89) [1] (216) (120) [1]
Losses and loss expenses 794 [1] 788 [1] 1,416 1,750 [1]
Policy benefits 48 [1] 49 [1] 109 100 [1]
Policy acquisition costs and administrative expenses 463 [1] 492 [1] 903 944 [1]
Interest (income) expense 12 [1] 6 [1] 17 10 [1]
Other (income) expense 58 [1] 29 [1] 60 25 [1]
Income tax expense 26 [1] 9 [1] 49 36 [1]
Net income 35 [1] 357 [1] 804 486 [1]
Comprehensive income (22) [1] 184 [1] 619 213 [1]
Consolidation, Eliminations [Member]
       
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items]        
Equity in earnings of subsidiaries (301) [2] (566) [2] (1,229) (805) [2]
Net income (301) [2] (566) [2] (1,229) (805) [2]
Comprehensive income $ (301) [2] $ (566) [2] $ (1,229) $ (805) [2]
[1] Includes all other subsidiaries of ACE Limited and intercompany eliminations.
[2] Includes ACE Limited parent company eliminations.