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Consolidated Statements Of Shareholders' Equity - USD ($) $ in Millions | Total | Common Stock [Member] | Common shares in treasury [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [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, 2018 |  | $ 11,121 | $ (2,618) | $ 12,557 | $ 31,700 | $ (12) | $ 31,688 | $ (545) | $ (1,976) | $ 73 |
Common Shares repurchased |  |  | (1,221) |  |  |  |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount |  | 0 | 0 |  | 0 |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  | 335 | (184) |  |  |  |  |  |  |
Exercise of stock options |  |  |  | (65) |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 177 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings |  |  |  | (1,020) |  |  |  |  |  |  |
Net income (loss) | $ 3,281 |  |  |  | 3,281 |  |  |  |  |  |
Funding of dividends declared from Additional paid-in capital |  |  |  |  | 1,020 |  |  |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (1,020) |  |  |  |  |  |
Change in period, before reclassification from AOCI, net of income tax expense of $(102), $(125), $(300) and $(674) |  |  |  |  |  |  |  | 3,117 |  |  |
Amounts reclassified from AOCI, net of income tax (expense) benefit of $7, nil, $(35) and $(2) |  |  |  |  |  |  |  | 41 |  |  |
Change in period, net of income tax expense of $(95), $(125), $(335) and $(676) |  |  |  |  |  |  |  | 3,158 |  |  |
Change in period, net of income tax (expense) benefit of $(13), $8, $27 and $3 |  |  |  |  |  |  |  |  | (140) |  |
Change in period, net of income tax benefit of $5, $4, $13 and $13 |  |  |  |  |  |  |  |  |  | (49) |
Balance - end of period at Sep. 30, 2019 | 54,572 | 11,121 | (3,504) | 11,465 | 34,969 |  |  | 2,613 | (2,116) | 24 | $ 521
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax |  |  |  |  |  |  |  | (674) |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | (2) |  |  |  |  |  |  | (2) |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax |  |  |  |  |  |  |  | (676) |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  |  |  |  |  |  |  |  | 3 |  |
Pension liability adjustment, Change in period, income tax (expense) benefit |  |  |  |  |  |  |  |  |  | 13 |
Balance - beginning of period at Jun. 30, 2019 |  | 11,121 | (3,093) | 11,757 | 33,878 | 0 | 33,878 | 2,033 | (1,931) | 37 |
Common Shares repurchased |  |  | (478) |  |  |  |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount |  | 0 | 0 |  | 0 |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  | 67 | 6 |  |  |  |  |  |  |
Exercise of stock options |  |  |  | (17) |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 60 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings |  |  |  | (341) |  |  |  |  |  |  |
Net income (loss) | 1,091 |  |  |  | 1,091 |  |  |  |  |  |
Funding of dividends declared from Additional paid-in capital |  |  |  |  | 341 |  |  |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (341) |  |  |  |  |  |
Change in period, before reclassification from AOCI, net of income tax expense of $(102), $(125), $(300) and $(674) |  |  |  |  |  |  |  | 569 |  |  |
Amounts reclassified from AOCI, net of income tax (expense) benefit of $7, nil, $(35) and $(2) |  |  |  |  |  |  |  | 11 |  |  |
Change in period, net of income tax expense of $(95), $(125), $(335) and $(676) |  |  |  |  |  |  |  | 580 |  |  |
Change in period, net of income tax (expense) benefit of $(13), $8, $27 and $3 |  |  |  |  |  |  |  |  | (185) |  |
Change in period, net of income tax benefit of $5, $4, $13 and $13 |  |  |  |  |  |  |  |  |  | (13) |
Balance - end of period at Sep. 30, 2019 | 54,572 | 11,121 | (3,504) | 11,465 | 34,969 |  |  | 2,613 | (2,116) | 24 | 521
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax |  |  |  |  |  |  |  | (125) |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 0 |  |  |  |  |  |  | 0 |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax |  |  |  |  |  |  |  | (125) |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  |  |  |  |  |  |  |  | 8 |  |
Pension liability adjustment, Change in period, income tax (expense) benefit |  |  |  |  |  |  |  |  |  | 4 |
Balance - beginning of period at Dec. 31, 2019 | 55,331 | 11,121 | (3,754) | 11,203 | 36,142 | (72) | 36,070 | 2,543 | (1,939) | 15 |
Common Shares repurchased |  |  | (326) |  |  |  |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount |  | (57) | 323 |  | (266) |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  | 216 | (195) |  |  |  |  |  |  |
Exercise of stock options |  |  |  | (30) |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 183 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings |  |  |  | (1,046) |  |  |  |  |  |  |
Net income (loss) | 1,115 |  |  |  | 1,115 |  |  |  |  |  |
Funding of dividends declared from Additional paid-in capital |  |  |  |  | 1,046 |  |  |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (1,046) |  |  |  |  |  |
Change in period, before reclassification from AOCI, net of income tax expense of $(102), $(125), $(300) and $(674) |  |  |  |  |  |  |  | 1,156 |  |  |
Amounts reclassified from AOCI, net of income tax (expense) benefit of $7, nil, $(35) and $(2) |  |  |  |  |  |  |  | 268 |  |  |
Change in period, net of income tax expense of $(95), $(125), $(335) and $(676) |  |  |  |  |  |  |  | 1,424 |  |  |
Change in period, net of income tax (expense) benefit of $(13), $8, $27 and $3 |  |  |  |  |  |  |  |  | (141) |  |
Change in period, net of income tax benefit of $5, $4, $13 and $13 |  |  |  |  |  |  |  |  |  | (46) |
Balance - end of period at Sep. 30, 2020 | 56,413 | 11,064 | (3,541) | 10,115 | 36,919 |  |  | 3,967 | (2,080) | (31) | 1,856
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax |  |  |  |  |  |  |  | (300) |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | $ (35) |  |  |  |  |  |  | (35) |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax |  |  |  |  |  |  |  | (335) |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  |  |  |  |  |  |  |  | 27 |  |
Pension liability adjustment, Change in period, income tax (expense) benefit |  |  |  |  |  |  |  |  |  | 13 |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |  |
Balance - beginning of period at Jun. 30, 2020 |  | 11,121 | (3,866) | 10,416 | 35,991 | $ 0 | $ 35,991 | 3,424 | (2,313) | (13) |
Common Shares repurchased |  |  | 0 |  |  |  |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount |  | (57) | 323 |  | (266) |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  | 2 | (6) |  |  |  |  |  |  |
Exercise of stock options |  |  |  | (1) |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 59 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings |  |  |  | (353) |  |  |  |  |  |  |
Net income (loss) | $ 1,194 |  |  |  | 1,194 |  |  |  |  |  |
Funding of dividends declared from Additional paid-in capital |  |  |  |  | 353 |  |  |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (353) |  |  |  |  |  |
Change in period, before reclassification from AOCI, net of income tax expense of $(102), $(125), $(300) and $(674) |  |  |  |  |  |  |  | 585 |  |  |
Amounts reclassified from AOCI, net of income tax (expense) benefit of $7, nil, $(35) and $(2) |  |  |  |  |  |  |  | (42) |  |  |
Change in period, net of income tax expense of $(95), $(125), $(335) and $(676) |  |  |  |  |  |  |  | 543 |  |  |
Change in period, net of income tax (expense) benefit of $(13), $8, $27 and $3 |  |  |  |  |  |  |  |  | 233 |  |
Change in period, net of income tax benefit of $5, $4, $13 and $13 |  |  |  |  |  |  |  |  |  | (18) |
Balance - end of period at Sep. 30, 2020 | 56,413 | $ 11,064 | $ (3,541) | $ 10,115 | $ 36,919 |  |  | 3,967 | (2,080) | (31) | $ 1,856
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax |  |  |  |  |  |  |  | (102) |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | $ 7 |  |  |  |  |  |  | 7 |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax |  |  |  |  |  |  |  | $ (95) |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  |  |  |  |  |  |  |  | $ (13) |  |
Pension liability adjustment, Change in period, income tax (expense) benefit |  |  |  |  |  |  |  |  |  | $ 5 |

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