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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Condensed Statement of Income Captions [Line Items]        
Net premiums written $ 8,110 $ 7,902 $ 23,229 $ 22,193
Net premiums earned 7,908 7,807 22,599 21,816
Net investment income 823 813 2,457 2,328
Income (Loss) from Subsidiaries, Net of Tax 0 0 0 0
Net realized gains (losses) including OTTI 19 (10) 35 84
Losses and loss expenses 4,868 6,247 13,457 14,182
Policy benefits 127 169 428 500
Policy acquisition costs and administrative expenses 2,223 2,202 6,590 6,430
Interest (income) expense 164 150 488 451
Other (income) expense (145) (118) (307) (333)
Amortization of purchased intangibles 83 65 253 194
Chubb integration expenses 16 50 39 233
Income tax expense 183 (85) 536 243
Net income (loss) 1,231 (70) 3,607 2,328
Comprehensive income (loss) 592 629 1,322 3,711
Consolidating Adjustments and Eliminations        
Condensed Statement of Income Captions [Line Items]        
Net premiums written 0 0 0 0
Net premiums earned 0 0 0 0
Net investment income 0 0 0 0
Income (Loss) from Subsidiaries, Net of Tax (1,886) (85) (5,488) (3,731)
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
Amortization of purchased intangibles 0 0 0 0
Chubb integration expenses 0 0 0 0
Income tax expense 0 0 0 0
Net income (loss) (1,886) (85) (5,488) (3,731)
Comprehensive income (loss) (687) (1,472) (1,407) (6,477)
Chubb Limited (Parent Guarantor)        
Condensed Statement of Income Captions [Line Items]        
Net premiums written 0 0 0 0
Net premiums earned 0 0 0 0
Net investment income 2 1 5 3
Income (Loss) from Subsidiaries, Net of Tax 1,177 (127) 3,440 2,153
Net realized gains (losses) including OTTI (1) 0 (1) (2)
Losses and loss expenses 0 0 0 0
Policy benefits 0 0 0 0
Policy acquisition costs and administrative expenses 23 20 64 56
Interest (income) expense (75) (84) (231) (252)
Other (income) expense (9) (5) (18) (7)
Amortization of purchased intangibles 0 0 0 0
Chubb integration expenses 3 7 7 13
Income tax expense 5 6 15 16
Net income (loss) 1,231 (70) 3,607 2,328
Comprehensive income (loss) 592 629 1,322 3,711
Chubb INA Holdings Inc (Subsidiary Issuer)        
Condensed Statement of Income Captions [Line Items]        
Net premiums written 0 0 0 0
Net premiums earned 0 0 0 0
Net investment income 3 3 12 10
Income (Loss) from Subsidiaries, Net of Tax 709 212 2,048 1,578
Net realized gains (losses) including OTTI 18 (8) 67 (22)
Losses and loss expenses 0 0 0 0
Policy benefits 0 0 0 0
Policy acquisition costs and administrative expenses (90) 16 (49) 28
Interest (income) expense 203 208 616 641
Other (income) expense 12 9 28 34
Amortization of purchased intangibles 0 0 0 0
Chubb integration expenses 1 1 2 54
Income tax expense (24) (89) (119) (288)
Net income (loss) 628 62 1,649 1,097
Comprehensive income (loss) 47 748 (199) 2,459
Other Chubb Limited Subsidiaries        
Condensed Statement of Income Captions [Line Items]        
Net premiums written 8,110 7,902 23,229 22,193
Net premiums earned 7,908 7,807 22,599 21,816
Net investment income 818 809 2,440 2,315
Income (Loss) from Subsidiaries, Net of Tax 0 0 0 0
Net realized gains (losses) including OTTI 2 (2) (31) 108
Losses and loss expenses 4,868 6,247 13,457 14,182
Policy benefits 127 169 428 500
Policy acquisition costs and administrative expenses 2,290 2,166 6,575 6,346
Interest (income) expense 36 26 103 62
Other (income) expense (148) (122) (317) (360)
Amortization of purchased intangibles 83 65 253 194
Chubb integration expenses 12 42 30 166
Income tax expense 202 (2) 640 515
Net income (loss) 1,258 23 3,839 2,634
Comprehensive income (loss) $ 640 $ 724 $ 1,606 $ 4,018