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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 | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Cumulative Translation Adjustment | Cumulative Translation Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] | Cumulative Translation Adjustment Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | Accumulated Defined Benefit Plans Adjustment [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Defined Benefit Plans Adjustment [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance – beginning of year at Dec. 31, 2017 |  | $ 11,121 | $ (1,944) | $ 13,978 | $ 27,474 | $ 264 | $ 27,738 | $ 1,450 | $ (296) | $ 1,154 | $ (1,187) | $ (22) | $ (1,209) | $ 280 | $ 47 | $ 327 |
Treasury Stock, Retired, Cost Method, Amount |  | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Common Shares repurchased | $ (1,021) |  | (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 $(426), $(647), and $338 |  |  |  |  |  |  |  | (1,960) |  |  |  |  |  |  |  |  |
Amounts reclassified from AOCI, net of income tax (expense) of $(36), nil, and $(41) |  |  |  |  |  |  |  | 261 |  |  |  |  |  |  |  |  |
Change in year, net of income tax (expense) benefit of $(462), $(647), and $297 |  |  |  |  |  |  |  | (1,699) |  |  |  |  |  |  |  |  |
Change in year, net of income tax (expense) benefit of $(4), $24, and $35 |  |  |  |  |  |  |  |  |  |  | (767) |  |  |  |  |  |
Change in year, net of income tax benefit of $50, $18, and $67 |  |  |  |  |  |  |  |  |  |  |  |  |  | (254) |  |  |
Balance – Ending of year at Dec. 31, 2018 | 50,312 | 11,121 | (2,618) | 12,557 | 31,700 | (12) | 31,688 | (545) | 0 | (545) | (1,976) |  | (1,976) | 73 | 0 | 73 | $ (2,448)
Treasury Stock, Retired, Cost Method, Amount |  | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Common Shares repurchased | (1,531) |  | (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 $(426), $(647), and $338 |  |  |  |  |  |  |  | 3,057 |  |  |  |  |  |  |  |  |
Amounts reclassified from AOCI, net of income tax (expense) of $(36), nil, and $(41) |  |  |  |  |  |  |  | 31 |  |  |  |  |  |  |  |  |
Change in year, net of income tax (expense) benefit of $(462), $(647), and $297 |  |  |  |  |  |  |  | 3,088 |  |  |  |  |  |  |  |  |
Change in year, net of income tax (expense) benefit of $(4), $24, and $35 |  |  |  |  |  |  |  |  |  |  | 37 |  |  |  |  |  |
Change in year, net of income tax benefit of $50, $18, and $67 |  |  |  |  |  |  |  |  |  |  |  |  |  | (58) |  |  |
Balance – Ending of year at Dec. 31, 2019 | 55,331 | 11,121 | (3,754) | 11,203 | 36,142 | $ (72) | $ 36,070 | 2,543 | $ 0 | $ 2,543 | (1,939) |  | $ (1,939) | 15 | $ 0 | $ 15 | 619
Treasury Stock, Retired, Cost Method, Amount |  | (57) | 323 |  | (266) |  |  |  |  |  |  |  |  |  |  |  |
Common Shares repurchased | (516) |  | (516) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  | 303 | (195) |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  |  | (50) |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 255 |  |  |  |  |  |  |  |  |  |  |  |  |
FundingDividendsDeclaredToRetainedEarnings |  |  |  | (1,398) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 3,533 |  |  |  | 3,533 |  |  |  |  |  |  |  |  |  |  |  |
Funding Dividends Declared From Additional Paid In Capital |  |  |  |  | 1,398 |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (1,398) |  |  |  |  |  |  |  |  |  |  |  |
Change in year, before reclassification from AOCI, net of income tax (expense) benefit of $(426), $(647), and $338 |  |  |  |  |  |  |  | 1,885 |  |  |  |  |  |  |  |  |
Amounts reclassified from AOCI, net of income tax (expense) of $(36), nil, and $(41) |  |  |  |  |  |  |  | 245 |  |  |  |  |  |  |  |  |
Change in year, net of income tax (expense) benefit of $(462), $(647), and $297 |  |  |  |  |  |  |  | 2,130 |  |  |  |  |  |  |  |  |
Change in year, net of income tax (expense) benefit of $(4), $24, and $35 |  |  |  |  |  |  |  |  |  |  | 302 |  |  |  |  |  |
Change in year, net of income tax benefit of $50, $18, and $67 |  |  |  |  |  |  |  |  |  |  |  |  |  | (182) |  |  |
Balance – Ending of year at Dec. 31, 2020 | $ 59,441 | $ 11,064 | $ (3,644) | $ 9,815 | $ 39,337 |  |  | $ 4,673 |  |  | $ (1,637) |  |  | $ (167) |  |  | $ 2,869

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