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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, 2019 |  | $ 11,121 | $ (3,754) | $ 11,203 | $ 36,142 | $ (72) | $ 36,070 | $ 2,543 | $ (1,939) | $ 15 |
Common Shares repurchased |  |  | (326) |  |  |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  | 214 | (189) |  |  |  |  |  |  |
Exercise of stock options |  |  |  | (29) |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 124 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings |  |  |  | (693) |  |  |  |  |  |  |
Net income (loss) | $ (79) |  |  |  | (79) |  |  |  |  |  |
Funding of dividends declared from Additional paid-in capital |  |  |  |  | 693 |  |  |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (693) |  |  |  |  |  |
Change in period, before reclassification from AOCI, net of income tax (expense) benefit of $(107), $(522), $294 and $(198) |  |  |  |  |  |  |  | 571 |  |  |
Amounts reclassified from AOCI, net of income tax expense of $(6), $(2), $(2), $(42) |  |  |  |  |  |  |  | 310 |  |  |
Change in period, net of income tax (expense) benefit of $(113), $(524), $292 and $(240) |  |  |  |  |  |  |  | 881 |  |  |
Change in period, net of income tax (expense) benefit of $(18), $6, $(16) and $40 |  |  |  |  |  |  |  |  | (374) |  |
Change in period, net of income tax benefit of $2, $5, $7 and $8 |  |  |  |  |  |  |  |  |  | (28) |
Balance - end of period at Jun. 30, 2020 | 54,760 | 11,121 | (3,866) | 10,416 | 35,991 |  |  | 3,424 | (2,313) | (13) | $ 1,098
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | (42) |  |  |  |  |  |  | (42) |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax |  |  |  |  |  |  |  | (240) |  |  |
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax |  |  |  |  |  |  |  | (198) |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  |  |  |  |  |  |  |  | 40 |  |
Pension liability adjustment, Change in period, income tax (expense) benefit |  |  |  |  |  |  |  |  |  | 8 |
Balance - beginning of period at Mar. 31, 2020 |  | 11,121 | (3,872) | 10,710 | 36,322 | 0 | 36,322 | 667 | (2,764) | 4 |
Common Shares repurchased |  |  | 0 |  |  |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  | 6 | 7 |  |  |  |  |  |  |
Exercise of stock options |  |  |  | (3) |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 55 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings |  |  |  | (353) |  |  |  |  |  |  |
Net income (loss) | (331) |  |  |  | (331) |  |  |  |  |  |
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) benefit of $(107), $(522), $294 and $(198) |  |  |  |  |  |  |  | 2,726 |  |  |
Amounts reclassified from AOCI, net of income tax expense of $(6), $(2), $(2), $(42) |  |  |  |  |  |  |  | 31 |  |  |
Change in period, net of income tax (expense) benefit of $(113), $(524), $292 and $(240) |  |  |  |  |  |  |  | 2,757 |  |  |
Change in period, net of income tax (expense) benefit of $(18), $6, $(16) and $40 |  |  |  |  |  |  |  |  | 451 |  |
Change in period, net of income tax benefit of $2, $5, $7 and $8 |  |  |  |  |  |  |  |  |  | (17) |
Balance - end of period at Jun. 30, 2020 | 54,760 | 11,121 | (3,866) | 10,416 | 35,991 |  |  | 3,424 | (2,313) | (13) | 1,098
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | (2) |  |  |  |  |  |  | (2) |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax |  |  |  |  |  |  |  | (524) |  |  |
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax |  |  |  |  |  |  |  | (522) |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  |  |  |  |  |  |  |  | 6 |  |
Pension liability adjustment, Change in period, income tax (expense) benefit |  |  |  |  |  |  |  |  |  | 5 |
Balance - beginning of period at Dec. 31, 2020 | 59,441 | 11,064 | (3,644) | 9,815 | 39,337 | 0 | 39,337 | 4,673 | (1,637) | (167) |
Common Shares repurchased |  |  | (2,440) |  |  |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  | 312 | (182) |  |  |  |  |  |  |
Exercise of stock options |  |  |  | (30) |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 147 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings |  |  |  | (704) |  |  |  |  |  |  |
Net income (loss) | 4,565 |  |  |  | 4,565 |  |  |  |  |  |
Funding of dividends declared from Additional paid-in capital |  |  |  |  | 704 |  |  |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (704) |  |  |  |  |  |
Change in period, before reclassification from AOCI, net of income tax (expense) benefit of $(107), $(522), $294 and $(198) |  |  |  |  |  |  |  | (1,293) |  |  |
Amounts reclassified from AOCI, net of income tax expense of $(6), $(2), $(2), $(42) |  |  |  |  |  |  |  | (38) |  |  |
Change in period, net of income tax (expense) benefit of $(113), $(524), $292 and $(240) |  |  |  |  |  |  |  | (1,331) |  |  |
Change in period, net of income tax (expense) benefit of $(18), $6, $(16) and $40 |  |  |  |  |  |  |  |  | 314 |  |
Change in period, net of income tax benefit of $2, $5, $7 and $8 |  |  |  |  |  |  |  |  |  | (30) |
Balance - end of period at Jun. 30, 2021 | 60,062 | 11,064 | (5,772) | 9,046 | 43,902 |  |  | 3,342 | (1,323) | (197) | 1,822
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | $ (2) |  |  |  |  |  |  | (2) |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax |  |  |  |  |  |  |  | 292 |  |  |
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax |  |  |  |  |  |  |  | 294 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  |  |  |  |  |  |  |  | (16) |  |
Pension liability adjustment, Change in period, income tax (expense) benefit |  |  |  |  |  |  |  |  |  | 7 |
Accounting Standards Update [Extensible List] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |  |  |
Balance - beginning of period at Mar. 31, 2021 |  | 11,064 | (3,901) | 9,318 | 41,637 | $ 0 | $ 41,637 | 2,761 | (1,613) | (190) |
Common Shares repurchased |  |  | (1,921) |  |  |  |  |  |  |  |
Net shares redeemed under employee share-based compensation plans |  |  | 50 | 5 |  |  |  |  |  |  |
Exercise of stock options |  |  |  | (6) |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 81 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings |  |  |  | (352) |  |  |  |  |  |  |
Net income (loss) | $ 2,265 |  |  |  | 2,265 |  |  |  |  |  |
Funding of dividends declared from Additional paid-in capital |  |  |  |  | 352 |  |  |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (352) |  |  |  |  |  |
Change in period, before reclassification from AOCI, net of income tax (expense) benefit of $(107), $(522), $294 and $(198) |  |  |  |  |  |  |  | 599 |  |  |
Amounts reclassified from AOCI, net of income tax expense of $(6), $(2), $(2), $(42) |  |  |  |  |  |  |  | (18) |  |  |
Change in period, net of income tax (expense) benefit of $(113), $(524), $292 and $(240) |  |  |  |  |  |  |  | 581 |  |  |
Change in period, net of income tax (expense) benefit of $(18), $6, $(16) and $40 |  |  |  |  |  |  |  |  | 290 |  |
Change in period, net of income tax benefit of $2, $5, $7 and $8 |  |  |  |  |  |  |  |  |  | (7) |
Balance - end of period at Jun. 30, 2021 | 60,062 | $ 11,064 | $ (5,772) | $ 9,046 | $ 43,902 |  |  | 3,342 | (1,323) | (197) | $ 1,822
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | $ (6) |  |  |  |  |  |  | (6) |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax |  |  |  |  |  |  |  | (113) |  |  |
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax |  |  |  |  |  |  |  | $ (107) |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  |  |  |  |  |  |  |  | $ (18) |  |
Pension liability adjustment, Change in period, income tax (expense) benefit |  |  |  |  |  |  |  |  |  | $ 2 |

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