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Shareholders' equity AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | $ 50,519 | $ 58,328 |
Other Comprehensive Income (Loss), before Tax | 3,678 | (10,076) | $ (2,507)
Other Comprehensive Income (Loss), Tax | 317 | (965) | (366)
Other Comprehensive Income (Loss), Net of Tax | 3,361 | (9,111) | (2,141)
Balance – end of year, net of tax | 59,507 | 50,519 | 58,328
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | (7,279) | 2,256 | 4,673
Balance – end of year, net of tax | (4,177) | (7,279) | 2,256
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Including Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 2,948 | (11,627) | (2,935)
Total net realized gains (losses) reclassified from AOCI | 500 | 1,049 | (3)
Other Comprehensive Income (Loss), before Tax | 3,448 | (10,578) | (2,938)
Other Comprehensive Income (Loss), Tax | 328 | (1,043) | (521)
Other Comprehensive Income (Loss), Net of Tax | 3,120 | (9,535) | (2,417)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), Net of Tax | 18 | 0 | 0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | (66) | 0 | 0
Balance – end of year, net of tax | (13) | (66) | 0
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | 225 | 240 | (167)
Balance – end of year, net of tax | 297 | 225 | 240
AOCI, Liability for Future Policy Benefit, Parent |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | (75) | (1,399) | 0
Balance – end of year, net of tax | 51 | (75) | (1,399)
AOCI, Liability for Future Policy Benefit, Parent | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | 0 | 0 | (1,725)
Balance – end of year, net of tax |  | 0 | 0
AOCI, Liability for Future Policy Benefit, Parent | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | (75) | (1,399) | (1,725)
Balance – end of year, net of tax |  | (75) | (1,399)
AOCI, Liability for Future Policy Benefit, Including Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), before Tax | 84 | 1,480 | 387
Other Comprehensive Income (Loss), Tax | 16 | (156) | (61)
Other Comprehensive Income (Loss), Net of Tax | 100 | 1,324 | 326
AOCI, Liability for Future Policy Benefit, Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), Net of Tax | (26) | 0 | 0
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | (24) | (57) | 0
Balance – end of year, net of tax | (22) | (24) | (57)
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | 0 | 0 | (84)
Balance – end of year, net of tax |  | 0 | 0
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | (24) | (57) | (84)
Balance – end of year, net of tax |  | (24) | (57)
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Including Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), Net of Tax | 2 | 33 | 27
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), Net of Tax | 0 | 0 | 0
Cumulative Translation Adjustment |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | (2,966) | (2,114) | (1,637)
Balance – end of year, net of tax | (2,945) | (2,966) | (2,114)
Cumulative Translation Adjustment | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | 0 | 0 | 7
Balance – end of year, net of tax |  | 0 | 0
Cumulative Translation Adjustment | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | (2,966) | (2,114) | (1,630)
Balance – end of year, net of tax |  | (2,966) | (2,114)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 0 | (907) | (505)
Total net realized gains (losses) reclassified from AOCI | (13) | (4) | 0
Other Comprehensive Income (Loss), before Tax | (13) | (911) | (505)
Other Comprehensive Income (Loss), Tax | (27) | (59) | (21)
Other Comprehensive Income (Loss), Net of Tax | 14 | (852) | (484)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), Net of Tax | (7) | 0 | 0
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 101 | 17 | 0
Total net realized gains (losses) reclassified from AOCI | (34) | (100) | 0
Other Comprehensive Income (Loss), before Tax | 67 | (83) | 0
Other Comprehensive Income (Loss), Tax | 14 | (17) | 0
Other Comprehensive Income (Loss), Net of Tax | 53 | (66) | 0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), Net of Tax | 0 | 0 | 0
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), before Tax | 90 | (17) | 522
Other Comprehensive Income (Loss), Tax | 18 | (2) | 115
Other Comprehensive Income (Loss), Net of Tax | 72 | (15) | 407
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), Net of Tax | 0 | 0 | 0
Accumulated Other Comprehensive Income |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | (10,185) | (1,074) | 2,869
Other Comprehensive Income (Loss), Net of Tax | 3,376 | (9,111) | (2,141)
Balance – end of year, net of tax | (6,809) | (10,185) | (1,074)
Accumulated Other Comprehensive Income | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | 0 | 0 | (1,802)
Balance – end of year, net of tax |  | 0 | 0
Accumulated Other Comprehensive Income | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance – beginning of year, net of tax | $ (10,185) | (1,074) | 1,067
Balance – end of year, net of tax |  | $ (10,185) | $ (1,074)

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