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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 |  |  |  | 372 | (365) | 323 |  |  |  |  |
Exercise of stock options |  |  |  |  | (44) |  |  |  |  |  |
Share-based compensation expense and other |  |  |  |  | 250 |  |  |  |  |  |
Funding of dividends declared to Retained earnings |  |  |  |  | (960) |  |  |  |  |  |
Net income | $ 2,525 |  |  |  |  |  | 2,525 |  |  |  |
Funding of dividends declared from Additional paid-in capital |  |  |  |  |  |  | 960 |  |  |  |
Dividends declared on Common Shares |  |  |  |  |  |  | (960) |  |  |  |
Change in period, before reclassification from AOCI, net of income tax expense of $(310) and $(559) |  |  |  |  |  |  |  | 1,540 |  |  |
Amounts reclassified from AOCI, net of income tax benefit of $3 and $16 |  |  |  |  |  |  |  | 133 |  |  |
Change in period, net of income tax expense of $(307) and $(543) |  |  |  |  |  |  |  | 1,673 |  |  |
Change in period, net of income tax expense of $(14) and $(18) |  |  |  |  |  |  |  |  | 251 |  |
Change in period, net of income tax benefit of $29 and nil |  |  |  |  |  |  |  |  |  | 8 |
Balance - end of period at Sep. 30, 2016 | 48,372 | 11,121 |  | (1,550) | 15,601 |  | 22,003 | 2,547 | (1,288) | (62) | $ 1,197
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 |  |  |  | (707) |  |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  |  | 310 | (311) | $ 0 |  |  |  |  |
Exercise of stock options |  |  |  |  | (43) |  |  |  |  |  |
Share-based compensation expense and other |  |  |  |  | 223 |  |  |  |  |  |
Funding of dividends declared to Retained earnings |  |  |  |  | (987) |  |  |  |  |  |
Net income | 2,328 |  |  |  |  |  | 2,328 |  |  |  |
Funding of dividends declared from Additional paid-in capital |  |  |  |  |  |  | 987 |  |  |  |
Dividends declared on Common Shares |  |  |  |  |  |  | (987) |  |  |  |
Change in period, before reclassification from AOCI, net of income tax expense of $(310) and $(559) |  |  |  |  |  |  |  | 609 |  |  |
Amounts reclassified from AOCI, net of income tax benefit of $3 and $16 |  |  |  |  |  |  |  | (24) |  |  |
Change in period, net of income tax expense of $(307) and $(543) |  |  |  |  |  |  |  | 585 |  |  |
Change in period, net of income tax expense of $(14) and $(18) |  |  |  |  |  |  |  |  | 887 |  |
Change in period, net of income tax benefit of $29 and nil |  |  |  |  |  |  |  |  |  | (89) |
Balance - end of period at Sep. 30, 2017 | $ 50,471 | $ 11,121 |  | $ (1,877) | $ 14,217 |  | $ 25,941 | $ 1,643 | $ (776) | $ 202 | $ 1,069

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