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Shareholders' equity AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance – beginning of period, net of tax |  |  | $ 59,507 |
Other comprehensive income (loss), before income tax | $ 3,205 | $ (1,772) | 1,601 | $ (1,305)
Other Comprehensive Income (Loss), Tax | 150 | 0 | 112 | 104
Other Comprehensive Income (Loss), Net of Tax | 3,055 | (1,772) | 1,489 | (1,409)
Balance – end of period, net of tax | 65,757 | 52,373 | 65,757 | 52,373
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 | (5,301) | (6,809) | (4,177) | (7,279)
Balance – end of period, net of tax | (2,042) | (8,953) | (2,042) | (8,953)
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 | 3,419 | (2,240) | 2,139 | (1,935)
Net Realized Gains (Losses) Reclassified from AOCI | (40) | (70) | (154) | (357)
Other comprehensive income (loss), before income tax | 3,459 | (2,170) | 2,293 | (1,578)
Other Comprehensive Income (Loss), Tax | 198 | (29) | 149 | 93
Other Comprehensive Income (Loss), Net of Tax | 3,261 | (2,141) | 2,144 | (1,671)
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 | 2 | 3 | 9 | 3
AOCI, Liability for Future Policy Benefit, Parent |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance – beginning of period, net of tax | 66 | (247) | 51 | (75)
Balance – end of period, net of tax | (527) | 404 | (527) | 404
AOCI, Liability for Future Policy Benefit, Including Noncontrolling Interest |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Other comprehensive income (loss), before income tax | (672) | 683 | (672) | 497
Other Comprehensive Income (Loss), Tax | (36) | 35 | (14) | 21
Other Comprehensive Income (Loss), Net of Tax | (636) | 648 | (658) | 476
AOCI, Liability for Future Policy Benefit, Noncontrolling Interest |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (43) | (3) | (80) | (3)
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 | (13) | (16) | (22) | (24)
Balance – end of period, net of tax | (20) | (21) | (20) | (21)
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Including Noncontrolling Interest |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Other comprehensive income (loss), before income tax | (8) | (5) | 2 | 3
Other Comprehensive Income (Loss), Tax | (1) | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | (7) | (5) | 2 | 3
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 | (3,342) | (2,920) | (2,945) | (2,966)
Balance – end of period, net of tax | (2,952) | (3,148) | (2,952) | (3,148)
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 | 450 | (314) | 6 | (269)
Net Realized Gains (Losses) Reclassified from AOCI | 5 | 3 | 11 | 10
Other comprehensive income (loss), before income tax | 445 | (317) | (5) | (279)
Other Comprehensive Income (Loss), Tax | (7) | (13) | (19) | (21)
Other Comprehensive Income (Loss), Net of Tax | 452 | (304) | 14 | (258)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 62 | (76) | 21 | (76)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance – beginning of period, net of tax | (11) | (53) | (13) | (66)
Balance – end of period, net of tax | (25) | (22) | (25) | (22)
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 | 42 | (17) | (12) | 23
Net Realized Gains (Losses) Reclassified from AOCI | 60 | (55) | 3 | (32)
Other comprehensive income (loss), before income tax | (18) | 38 | (15) | 55
Other Comprehensive Income (Loss), Tax | (4) | 7 | (3) | 11
Other Comprehensive Income (Loss), Net of Tax | (14) | 31 | (12) | 44
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 | 297 | 223 | 297 | 225
Balance – end of period, net of tax | 296 | 222 | 296 | 222
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 income tax | (1) | (1) | (2) | (3)
Other Comprehensive Income (Loss), Tax | 0 | 0 | (1) | 0
Other Comprehensive Income (Loss), Net of Tax | (1) | (1) | (1) | (3)
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 | (8,304) | (9,822) | (6,809) | (10,185)
Other Comprehensive Income (Loss), Net of Tax | 3,034 | (1,696) | 1,539 | (1,333)
Balance – end of period, net of tax | $ (5,270) | $ (11,518) | $ (5,270) | $ (11,518)

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