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Consolidated Statements Of Shareholders' Equity - USD ($) $ in Millions | Total | Common Stock [Member] | Common Stock [Member] The Chubb Corporation [Member] | Common shares in treasury [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] The Chubb Corporation [Member] | Retained Earnings [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] | Cumulative Foreign Currency Translation Adjustment [Member] | Postretirement Benefit Liability Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance - beginning of period at Dec. 31, 2015 |  | $ 7,833 |  | $ (1,922) | $ 4,481 |  | $ 19,478 | $ 874 | $ (1,539) | $ (70) |
Shares Issued for Chubb Corp Acquisition |  |  | $ 3,288 |  |  | $ 11,916 |  |  |  |  |
Common Shares repurchased |  |  |  | 0 |  |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  |  | 274 | (310) | 323 |  |  |  |  |
Exercise of stock options |  |  |  |  | (21) |  |  |  |  |  |
Share-based compensation expense and other |  |  |  |  | 65 |  |  |  |  |  |
Funding of dividends declared to Retained earnings |  |  |  |  | (314) |  |  |  |  |  |
Net income | $ 439 |  |  |  |  |  | 439 |  |  |  |
Funding of dividends declared from Additional paid-in capital |  |  |  |  |  |  | 314 |  |  |  |
Dividends declared on Common Shares |  |  |  |  |  |  | (314) |  |  |  |
Change in period, before reclassification from AOCI, net of income tax expense of $(102) and $(232) |  |  |  |  |  |  |  | 673 |  |  |
Amounts reclassified from AOCI, net of income tax expense of $(6) and $(1) |  |  |  |  |  |  |  | 151 |  |  |
Change in period, net of income tax expense of $(108) and $(233) |  |  |  |  |  |  |  | 824 |  |  |
Change in period, net of income tax expense of $(3) and $(35) |  |  |  |  |  |  |  |  | 277 |  |
Change in period, net of income tax expense of $(4) and $(1) |  |  |  |  |  |  |  |  |  | 1 |
Balance - end of period at Mar. 31, 2016 | 45,897 | 11,121 |  | (1,648) | 16,140 |  | 19,917 | 1,698 | (1,262) | (69) | $ 367
Balance - beginning of period at Dec. 31, 2016 | 48,275 | 11,121 |  | (1,480) | 15,335 |  | 23,613 | 1,058 | (1,663) | 291 |
Shares Issued for Chubb Corp Acquisition |  |  | $ 0 |  |  | 0 |  |  |  |  |
Common Shares repurchased |  |  |  | (140) |  |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  |  | 222 | (260) | $ 0 |  |  |  |  |
Exercise of stock options |  |  |  |  | (21) |  |  |  |  |  |
Share-based compensation expense and other |  |  |  |  | 65 |  |  |  |  |  |
Funding of dividends declared to Retained earnings |  |  |  |  | (324) |  |  |  |  |  |
Net income | 1,093 |  |  |  |  |  | 1,093 |  |  |  |
Funding of dividends declared from Additional paid-in capital |  |  |  |  |  |  | 324 |  |  |  |
Dividends declared on Common Shares |  |  |  |  |  |  | (324) |  |  |  |
Change in period, before reclassification from AOCI, net of income tax expense of $(102) and $(232) |  |  |  |  |  |  |  | 205 |  |  |
Amounts reclassified from AOCI, net of income tax expense of $(6) and $(1) |  |  |  |  |  |  |  | 2 |  |  |
Change in period, net of income tax expense of $(108) and $(233) |  |  |  |  |  |  |  | 207 |  |  |
Change in period, net of income tax expense of $(3) and $(35) |  |  |  |  |  |  |  |  | 131 |  |
Change in period, net of income tax expense of $(4) and $(1) |  |  |  |  |  |  |  |  |  | (24) |
Balance - end of period at Mar. 31, 2017 | $ 49,224 | $ 11,121 |  | $ (1,398) | $ 14,795 |  | $ 24,706 | $ 1,265 | $ (1,532) | $ 267 | $ 0

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