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Shareholders' equity AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance – beginning of period, net of tax |  |  | $ 50,519 |
Other comprehensive loss, before income tax | $ (1,772) | $ (3,559) | (1,305) | $ (12,113)
Other Comprehensive Income (Loss), Tax | 0 | (109) | 104 | (1,071)
Other Comprehensive Income (Loss), Net of Tax | (1,772) | (3,450) | (1,409) | (11,042)
Balance – end of period, net of tax | 52,373 | 47,675 | 52,373 | 47,675
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance – beginning of period, net of tax | (6,809) | (5,713) | (7,279) | 2,256
Balance – end of period, net of tax | (8,953) | (8,611) | (8,953) | (8,611)
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 | (2,240) | (3,324) | (1,935) | (12,898)
Net Realized Gains (Losses) Reclassified from AOCI | (70) | (279) | (357) | (857)
Other comprehensive loss, before income tax | (2,170) | (3,045) | (1,578) | (12,041)
Other Comprehensive Income (Loss), Tax | (29) | (147) | 93 | (1,174)
Other Comprehensive Income (Loss), Net of Tax | (2,141) | (2,898) | (1,671) | (10,867)
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 | 3 | 0 | 3 | 0
AOCI, Liability for Future Policy Benefit, Parent |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance – beginning of period, net of tax | (247) | (427) | (75) | (1,399)
Balance – end of period, net of tax | 404 | (5) | 404 | (5)
AOCI, Liability for Future Policy Benefit, Including Noncontrolling Interest |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Other comprehensive loss, before income tax | 683 | 479 | 497 | 1,546
Other Comprehensive Income (Loss), Tax | 35 | 57 | 21 | 152
Other Comprehensive Income (Loss), Net of Tax | 648 | 422 | 476 | 1,394
AOCI, Liability for Future Policy Benefit, Noncontrolling Interest |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (3) | 0 | (3) | 0
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance – beginning of period, net of tax | (16) | (17) | (24) | (57)
Balance – end of period, net of tax | (21) | (9) | (21) | (9)
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 | (5) | 8 | 3 | 48
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 | 0
Cumulative Foreign Currency Translation Adjustment [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance – beginning of period, net of tax | (2,920) | (2,768) | (2,966) | (2,114)
Balance – end of period, net of tax | (3,148) | (3,703) | (3,148) | (3,703)
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 | (314) | (942) | (269) | (1,631)
Net Realized Gains (Losses) Reclassified from AOCI | 3 | 0 | 10 | 0
Other comprehensive loss, before income tax | (317) | (942) | (279) | (1,631)
Other Comprehensive Income (Loss), Tax | (13) | (7) | (21) | (42)
Other Comprehensive Income (Loss), Net of Tax | (304) | (935) | (258) | (1,589)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (76) | 0 | (76) | 0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance – beginning of period, net of tax | (53) | 0 | (66) | 0
Balance – end of period, net of tax | (22) | (49) | (22) | (49)
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 | (17) | (94) | 23 | (94)
Net Realized Gains (Losses) Reclassified from AOCI | (55) | (32) | (32) | (32)
Other comprehensive loss, before income tax | 38 | (62) | 55 | (62)
Other Comprehensive Income (Loss), Tax | 7 | (13) | 11 | (13)
Other Comprehensive Income (Loss), Net of Tax | 31 | (49) | 44 | (49)
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 | 0
Postretirement Benefit Liability Adjustment [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance – beginning of period, net of tax | 223 | 259 | 225 | 240
Balance – end of period, net of tax | 222 | 261 | 222 | 261
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Other comprehensive loss, before income tax | (1) | 3 | (3) | 27
Other Comprehensive Income (Loss), Tax | 0 | 1 | 0 | 6
Other Comprehensive Income (Loss), Net of Tax | (1) | 2 | (3) | 21
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 | 0
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance – beginning of period, net of tax | (9,822) | (8,666) | (10,185) | (1,074)
Other Comprehensive Income (Loss), Net of Tax | (1,696) | (3,450) | (1,333) | (11,042)
Balance – end of period, net of tax | $ (11,518) | $ (12,116) | $ (11,518) | $ (12,116)

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