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Accumulated Other Comprehensive Income Loss - AOCI Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 15,327 |
Other comprehensive income (loss), net of tax | $ 1,063 | $ (654) | 844 | $ (337)
Ending balance | 17,008 | 13,679 | 17,008 | 13,679
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance | (1,732) | (2,277) | (1,482) | (2,594)
OCI before reclassifications | 1,292 | (876) | 900 | (522)
Amounts reclassified from AOCI | 50 | 26 | 127 | 74
OCI, before tax | 1,342 | (850) | 1,027 | (448)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | (281) | 179 | (216) | 94
Other comprehensive income (loss), net of tax | 1,061 | (671) | 811 | (354)
Ending balance | (671) | (2,948) | (671) | (2,948)
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance | (7) | (10) | (8) | (7)
OCI before reclassifications | 2 | (1) | 3 | (7)
Amounts reclassified from AOCI | 1 | 2 | 1 | 4
OCI, before tax | 3 | 1 | 4 | (3)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | (1) | 0 | (1) | 1
Other comprehensive income (loss), net of tax | 2 | 1 | 3 | (2)
Ending balance | (5) | (9) | (5) | (9)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance | 30 | 31 | 21 | 40
OCI before reclassifications | 2 | (5) | 13 | (19)
Amounts reclassified from AOCI | 2 | (1) | 2 | 2
OCI, before tax | 4 | (6) | 15 | (17)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | (1) | 2 | (3) | 4
Other comprehensive income (loss), net of tax | 3 | (4) | 12 | (13)
Ending balance | 33 | 27 | 33 | 27
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance | 35 | 36 | 37 | 31
OCI before reclassifications | 8 | (1) | 5 | 5
Amounts reclassified from AOCI | 0 | 0 | 0 | 0
OCI, before tax | 8 | (1) | 5 | 5
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | (2) | 0 | (1) | (1)
Other comprehensive income (loss), net of tax | 6 | (1) | 4 | 4
Ending balance | 41 | 35 | 41 | 35
AOCI, Liability for Future Policy Benefit, Parent |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance | 35 | 32 | 25 | 35
OCI before reclassifications | (20) | 19 | (8) | 15
Amounts reclassified from AOCI | 0 | 0 | 0 | 0
OCI, before tax | (20) | 19 | (8) | 15
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 4 | (4) | 2 | (3)
Other comprehensive income (loss), net of tax | (16) | 15 | (6) | 12
Ending balance | 19 | 47 | 19 | 47
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance | (1,429) | (1,336) | (1,442) | (1,346)
OCI before reclassifications | 0 | 1 | 0 | 0
Amounts reclassified from AOCI | 9 | 7 | 25 | 20
OCI, before tax | 9 | 8 | 25 | 20
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | (2) | (2) | (5) | (4)
Other comprehensive income (loss), net of tax | 7 | 6 | 20 | 16
Ending balance | (1,422) | (1,330) | (1,422) | (1,330)
AOCI Attributable to Parent [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance | (3,068) | (3,524) | (2,849) | (3,841)
OCI before reclassifications | 1,284 | (863) | 913 | (528)
Amounts reclassified from AOCI | 62 | 34 | 155 | 100
OCI, before tax | 1,346 | (829) | 1,068 | (428)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | (283) | 175 | (224) | 91
Other comprehensive income (loss), net of tax | 1,063 | (654) | 844 | (337)
Ending balance | $ (2,005) | $ (4,178) | $ (2,005) | $ (4,178)

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