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Consolidated Statements Of Shareholders' Equity - USD ($) $ in Millions | Total | Common Shares | Common Shares in Treasury | Additional Paid-in Capital | Retained Earnings | Net unrealized appreciation on investments | Cumulative Translation Adjustment | Accumulated Defined Benefit Plans Adjustment [Member] | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ 0 | $ 0 |  |  |
Balance – beginning and end of year at Dec. 31, 2016 |  | $ 11,121 | $ (1,480) | $ 15,335 | 23,613 | 1,058 | $ (1,663) | $ 291 |
Common Shares repurchased |  |  | (830) |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  | 366 | (313) |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  |  | (58) |  |  |  |  |
Share-based compensation expense |  |  |  | 331 |  |  |  |  |
FundingDividendsDeclaredToRetainedEarnings |  |  |  | (1,317) |  |  |  |  |
Net income | $ 3,861 |  |  |  | 3,861 |  |  |  |
Funding Dividends Declared From Additional Paid In Capital |  |  |  |  | 1,317 |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (1,317) |  |  |  |
Change in year, before reclassification from AOCI, net of income tax (expense) benefit of $(647), $338, and $(228) |  |  |  |  |  | 390 |  |  |
Amounts reclassified from AOCI, net of income tax (expense) benefit of nil, $(41), and $(13) |  |  |  |  |  | 2 |  |  |
Change in year, net of income tax (expense) benefit of $(647), $297, and $(241) |  |  |  |  |  | 392 |  |  |
Change in year, net of income tax benefit of $24, $35, and $5 |  |  |  |  |  |  | 476 |  |
Change in year, net of income tax benefit of $18, $67, and $5 |  |  |  |  |  |  |  | (11) |
Balance – Ending of year at Dec. 31, 2017 | 51,172 | 11,121 | (1,944) | 13,978 | 27,738 | 1,154 | (1,209) | 327 | $ 543
Balance – Ending of year (Previous Accounting Guidance [Member]) at Dec. 31, 2017 |  |  |  |  | 27,474 | 1,450 | (1,187) | 280 |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 264 | (296) |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  | 0 | 0 |
Common Shares repurchased |  |  | (1,021) |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  | 347 | (313) |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  |  | (49) |  |  |  |  |
Share-based compensation expense |  |  |  | 285 |  |  |  |  |
FundingDividendsDeclaredToRetainedEarnings |  |  |  | (1,344) |  |  |  |  |
Net income | 3,962 |  |  |  | 3,962 |  |  |  |
Funding Dividends Declared From Additional Paid In Capital |  |  |  |  | 1,344 |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (1,344) |  |  |  |
Change in year, before reclassification from AOCI, net of income tax (expense) benefit of $(647), $338, and $(228) |  |  |  |  |  | (1,960) |  |  |
Amounts reclassified from AOCI, net of income tax (expense) benefit of nil, $(41), and $(13) |  |  |  |  |  | 261 |  |  |
Change in year, net of income tax (expense) benefit of $(647), $297, and $(241) |  |  |  |  |  | (1,699) |  |  |
Change in year, net of income tax benefit of $24, $35, and $5 |  |  |  |  |  |  | (767) |  |
Change in year, net of income tax benefit of $18, $67, and $5 |  |  |  |  |  |  |  | (254) |
Balance – Ending of year at Dec. 31, 2018 | 50,312 | 11,121 | (2,618) | 12,557 | 31,688 | (545) | (1,976) | 73 | (2,448)
Balance – Ending of year (Previous Accounting Guidance [Member]) at Dec. 31, 2018 |  |  |  |  | 31,700 | (545) | (1,976) | 73 |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | (12) |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  | (22) | 47 |
Common Shares repurchased |  |  | (1,531) |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  | 395 | (178) |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  |  | (82) |  |  |  |  |
Share-based compensation expense |  |  |  | 266 |  |  |  |  |
FundingDividendsDeclaredToRetainedEarnings |  |  |  | (1,360) |  |  |  |  |
Net income | 4,454 |  |  |  | 4,454 |  |  |  |
Funding Dividends Declared From Additional Paid In Capital |  |  |  |  | 1,360 |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (1,360) |  |  |  |
Change in year, before reclassification from AOCI, net of income tax (expense) benefit of $(647), $338, and $(228) |  |  |  |  |  | 3,057 |  |  |
Amounts reclassified from AOCI, net of income tax (expense) benefit of nil, $(41), and $(13) |  |  |  |  |  | 31 |  |  |
Change in year, net of income tax (expense) benefit of $(647), $297, and $(241) |  |  |  |  |  | 3,088 |  |  |
Change in year, net of income tax benefit of $24, $35, and $5 |  |  |  |  |  |  | 37 |  |
Change in year, net of income tax benefit of $18, $67, and $5 |  |  |  |  |  |  |  | (58) |
Balance – Ending of year at Dec. 31, 2019 | $ 55,331 | $ 11,121 | $ (3,754) | $ 11,203 | $ 36,142 | 2,543 | (1,939) | 15 | $ 619
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | $ 0 |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  | $ 0 | $ 0 |

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