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Shareholders' equity AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 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 | $ (990) | $ (955) | (1,604) | $ 467
Other Comprehensive Income (Loss), Tax | (29) | (28) | (38) | 104
Other Comprehensive Income (Loss), Net of Tax | (961) | (927) | (1,566) | 363
Balance – end of period, net of tax | 61,038 | 52,875 | 61,038 | 52,875
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 | (4,825) | (5,659) | (4,177) | (7,279)
Balance – end of period, net of tax | (5,301) | (6,809) | (5,301) | (6,809)
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 | (484) | (1,301) | (1,280) | 305
Net Realized Gains (Losses) Reclassified from AOCI | 5 | (107) | (114) | (287)
Other comprehensive income (loss), before income tax | (489) | (1,194) | (1,166) | 592
Other Comprehensive Income (Loss), Tax | (7) | (44) | (49) | 122
Other Comprehensive Income (Loss), Net of Tax | (482) | (1,150) | (1,117) | 470
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 | (6) | 0 | 7 | 0
AOCI, Liability for Future Policy Benefit, Parent |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance – beginning of period, net of tax | 11 | (205) | 51 | (75)
Balance – end of period, net of tax | 66 | (247) | 66 | (247)
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 | (35) | 0 | (186)
Other Comprehensive Income (Loss), Tax | 2 | 7 | 22 | (14)
Other Comprehensive Income (Loss), Net of Tax | 51 | (42) | (22) | (172)
AOCI, Liability for Future Policy Benefit, Noncontrolling Interest |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (4) | 0 | (37) | 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 | (17) | (27) | (22) | (24)
Balance – end of period, net of tax | (13) | (16) | (13) | (16)
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 | 5 | 11 | 10 | 8
Other Comprehensive Income (Loss), Tax | 1 | 0 | 1 | 0
Other Comprehensive Income (Loss), Net of Tax | 4 | 11 | 9 | 8
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 | (2,864) | (3,136) | (2,945) | (2,966)
Balance – end of period, net of tax | (3,342) | (2,920) | (3,342) | (2,920)
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 | (527) | 219 | (444) | 45
Net Realized Gains (Losses) Reclassified from AOCI | 3 | 4 | 6 | 7
Other comprehensive income (loss), before income tax | (530) | 215 | (450) | 38
Other Comprehensive Income (Loss), Tax | (19) | (1) | (12) | (8)
Other Comprehensive Income (Loss), Net of Tax | (511) | 216 | (438) | 46
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (33) | 0 | (41) | 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 | (92) | (13) | (66)
Balance – end of period, net of tax | (11) | (53) | (11) | (53)
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 | (46) | 57 | (54) | 40
Net Realized Gains (Losses) Reclassified from AOCI | (16) | 7 | (57) | 23
Other comprehensive income (loss), before income tax | (30) | 50 | 3 | 17
Other Comprehensive Income (Loss), Tax | (6) | 11 | 1 | 4
Other Comprehensive Income (Loss), Net of Tax | (24) | 39 | 2 | 13
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 | 296 | 224 | 297 | 225
Balance – end of period, net of tax | 297 | 223 | 297 | 223
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 | (2) | (1) | (2)
Other Comprehensive Income (Loss), Tax | 0 | (1) | (1) | 0
Other Comprehensive Income (Loss), Net of Tax | 1 | (1) | 0 | (2)
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 | (7,386) | (8,895) | (6,809) | (10,185)
Other Comprehensive Income (Loss), Net of Tax | (918) | (927) | (1,495) | 363
Balance – end of period, net of tax | $ (8,304) | $ (9,822) | $ (8,304) | $ (9,822)

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