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Schedule II Schedule II (STATEMENTS OF OPERATIONS - Parent Company Only) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in net income of subsidiaries and affiliates |  |  |  |  |  |  |  |  | $ 418 | $ 264 | $ 113
Net realized gains (losses) | $ 0 | $ (10) | $ 101 | $ (7) | $ 365 | $ 100 | $ (216) | $ (394) | 84 | (145) | (420)
Total revenues | 8,015 | 8,610 | 8,108 | 7,510 | 8,168 | 8,527 | 7,897 | 6,877 | 32,243 | 31,469 | 18,987
Administrative and other (income) expense |  |  |  |  |  |  |  |  | 2,833 | 3,081 | 2,270
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  | 310 | 492 | 33
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (139) | 815 | 462
Total expenses |  |  |  |  |  |  |  |  | 28,521 | 26,519 | 15,691
Net income | $ 1,533 | $ (70) | $ 1,305 | $ 1,093 | $ 1,610 | $ 1,360 | $ 726 | $ 439 | 3,861 | 4,135 | 2,834
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 4,718 | 4,556 | 908
Chubb limited (Parent Guarantor) |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income, including intercompany interest income |  |  |  |  |  |  |  |  | 336 | 356 | 35
Equity in net income of subsidiaries and affiliates |  |  |  |  |  |  |  |  | 3,640 | 3,901 | 2,673
Net realized gains (losses) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenues |  |  |  |  |  |  |  |  | 3,976 | 4,257 | 2,708
Administrative and other (income) expense |  |  |  |  |  |  |  |  | 63 | 39 | (145)
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  | 32 | 62 | 3
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 20 | 21 | 16
Total expenses |  |  |  |  |  |  |  |  | 115 | 122 | (126)
Net income |  |  |  |  |  |  |  |  | 3,861 | 4,135 | 2,834
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | $ 4,718 | $ 4,556 | $ 908

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