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Shareholders' equity AOCI (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 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 | (614) | $ 1,422
Other Comprehensive Income (Loss), Tax | (9) | 132
Other Comprehensive Income (Loss), Net of Tax | (605) | 1,290
Balance – end of period, net of tax | 60,535 | 52,987
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 | (4,177) | (7,279)
Balance – end of period, net of tax | (4,825) | (5,659)
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 | (796) | 1,606
Net Realized Gains (Losses) Reclassified from AOCI | (119) | (180)
Other comprehensive income (loss), before income tax | (677) | 1,786
Other Comprehensive Income (Loss), Tax | (42) | 166
Other Comprehensive Income (Loss), Net of Tax | (635) | 1,620
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 | 13 | 0
AOCI, Liability for Future Policy Benefit, Parent |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance – beginning of period, net of tax | 51 | (75)
Balance – end of period, net of tax | 11 | (205)
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 | (53) | (151)
Other Comprehensive Income (Loss), Tax | 20 | (21)
Other Comprehensive Income (Loss), Net of Tax | (73) | (130)
AOCI, Liability for Future Policy Benefit, Noncontrolling Interest |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Other Comprehensive Income (Loss), Net of Tax | (33) | 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 | (22) | (24)
Balance – end of period, net of tax | (17) | (27)
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 | (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
Cumulative Foreign Currency Translation Adjustment [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance – beginning of period, net of tax | (2,945) | (2,966)
Balance – end of period, net of tax | (2,864) | (3,136)
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 | 83 | (174)
Net Realized Gains (Losses) Reclassified from AOCI | 3 | 3
Other comprehensive income (loss), before income tax | 80 | (177)
Other Comprehensive Income (Loss), Tax | 7 | (7)
Other Comprehensive Income (Loss), Net of Tax | 73 | (170)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Other Comprehensive Income (Loss), Net of Tax | (8) | 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 | (13) | (66)
Balance – end of period, net of tax | 13 | (92)
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 | (8) | (17)
Net Realized Gains (Losses) Reclassified from AOCI | (41) | 16
Other comprehensive income (loss), before income tax | 33 | (33)
Other Comprehensive Income (Loss), Tax | 7 | (7)
Other Comprehensive Income (Loss), Net of Tax | 26 | (26)
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
Postretirement Benefit Liability Adjustment [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance – beginning of period, net of tax | 297 | 225
Balance – end of period, net of tax | 296 | 224
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 | (2) | 0
Other Comprehensive Income (Loss), Tax | (1) | 1
Other Comprehensive Income (Loss), Net of Tax | (1) | (1)
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
Accumulated Other Comprehensive Income (Loss) [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance – beginning of period, net of tax | (6,809) | (10,185)
Other Comprehensive Income (Loss), Net of Tax | (577) | 1,290
Balance – end of period, net of tax | $ (7,386) | $ (8,895)

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