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Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Beginning Balance | $ 23,071 | $ 22,290 | $ 18,261
Net unrealized gains (losses) | 32 | 41 | (10)
Amounts reclassified into earnings | (3) |  |
Net translation of investments in foreign operations | 215 | 84 | (500)
Net gains (losses) related to hedges of investment in foreign operations |  |  | 328
Net gains (losses) related to hedges of investment in foreign operations | (252) | (140) |
Pension and other postretirement benefits | (150) | (125) | 11
Other |  |  | 2
Net change in accumulated other comprehensive (loss) income | (158) | (140) | (169)
Ending Balance | 22,984 | 23,071 | 22,290
Tax impact for the changes in each component of accumulated other comprehensive (loss) income |  |  |
Net unrealized investment securities | 9 | 12 | (2)
Net translation on investments in foreign operations | 17 | 24 | (44)
Net hedges of investments in foreign operations | (79) | (43) |
Net hedges of investments in foreign operations |  |  | 107
Pension and other postretirement benefits | (28) | (38) | 9
Total tax impact | (81) | (45) | 70
Accumulated Other Comprehensive Loss [Member] |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Beginning Balance | (2,737) | (2,597) | (2,428)
Ending Balance | (2,895) | (2,737) | (2,597)
Net Unrealized Investment Gains (Losses) on Investment Securities [Member] |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Beginning Balance | 33 | (8) | 0
Net unrealized gains (losses) | 32 | 41 | (10)
Amounts reclassified into earnings | 0 |  |
Net translation of investments in foreign operations | 0 | 0 | 0
Net gains (losses) related to hedges of investment in foreign operations |  |  | 0
Net gains (losses) related to hedges of investment in foreign operations | 0 | 0 |
Pension and other postretirement benefits | 0 | 0 | 0
Other |  |  | 2
Net change in accumulated other comprehensive (loss) income | 32 | 41 | (8)
Ending Balance | 65 | 33 | (8)
Foreign Currency Translation Adjustments [Member] |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Beginning Balance | (2,189) | (2,133) | (1,961)
Net unrealized gains (losses) | 0 | 0 | 0
Amounts reclassified into earnings | (3) |  |
Net translation of investments in foreign operations | 215 | 84 | (500)
Net gains (losses) related to hedges of investment in foreign operations |  |  | 328
Net gains (losses) related to hedges of investment in foreign operations | (252) | (140) |
Pension and other postretirement benefits | 0 | 0 | 0
Other |  |  | 0
Net change in accumulated other comprehensive (loss) income | (40) | (56) | (172)
Ending Balance | (2,229) | (2,189) | (2,133)
Net Unrealized Pension and Other Postretirement Benefit (Losses) Gains [Member] |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Beginning Balance | (581) | (456) | (467)
Net unrealized gains (losses) | 0 | 0 | 0
Amounts reclassified into earnings | 0 |  |
Net translation of investments in foreign operations | 0 | 0 | 0
Net gains (losses) related to hedges of investment in foreign operations |  |  | 0
Net gains (losses) related to hedges of investment in foreign operations | 0 | 0 |
Pension and other postretirement benefits | (150) | (125) | 11
Other |  |  | 0
Net change in accumulated other comprehensive (loss) income | (150) | (125) | 11
Ending Balance | $ (731) | $ (581) | $ (456)

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