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Shareholder's Equity - Changes in AOCI Components (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance | $ 3,803 | [1],[2] | $ 4,837 | [1] | $ 6,131 |
OCI before reclassifications | 756 |  | (1,985) |  | (71) |
Amounts reclassified from AOCI | 24 |  | 81 |  | (427) |
Total other comprehensive income (loss), net of tax | 780 |  | (1,904) | [3] | (498) | [3]
Ending balance | 4,729 |  | 3,803 | [1],[2] | 4,837 | [1]
Cumulative effect of adoption of long-duration contracts guidance |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance |  |  |  |  | (1,897) |
Total AOCI |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance | (2,546) | [1] | (642) | [1] | 893 |
Total other comprehensive income (loss), net of tax | 780 |  | (1,904) |  | (498) |
Ending balance | (1,766) |  | (2,546) | [1] | (642) | [1]
Total AOCI | Cumulative effect of adoption of long-duration contracts guidance |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance |  |  |  |  | (1,037) |
Net Unrealized Gains (Losses) on Securities |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance | (2,043) |  | 1,033 |  | 1,247 |
OCI before reclassifications | 779 |  | (3,143) |  | (478) |
Amounts reclassified from AOCI | 23 |  | 67 |  | (443) |
Total other comprehensive income (loss), net of tax | 802 |  | (3,076) |  | (921) |
Ending balance | (1,241) |  | (2,043) |  | 1,033 |
Net Unrealized Gains (Losses) on Securities | Cumulative effect of adoption of long-duration contracts guidance |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance |  |  |  |  | 707 |
Net Unrealized Gains (Losses) on Derivatives |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance | 3 |  | 4 |  | 5 |
OCI before reclassifications | 2 |  | 0 |  | 0 |
Amounts reclassified from AOCI | 0 |  | (1) |  | (1) |
Total other comprehensive income (loss), net of tax | 2 |  | (1) |  | (1) |
Ending balance | 5 |  | 3 |  | 4 |
Net Unrealized Gains (Losses) on Derivatives | Cumulative effect of adoption of long-duration contracts guidance |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance |  |  |  |  | 0 |
Effect of changes in discount rate assumptions on certain long-duration contracts |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance | (72) |  | (933) |  | 0 |
OCI before reclassifications | (54) |  | 861 |  | 284 |
Amounts reclassified from AOCI | 0 |  | 0 |  | 0 |
Total other comprehensive income (loss), net of tax | (54) |  | 861 |  | 284 |
Ending balance | (126) |  | (72) |  | (933) |
Effect of changes in discount rate assumptions on certain long-duration contracts | Cumulative effect of adoption of long-duration contracts guidance |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance |  |  |  |  | (1,217) |
Effect of changes in instrument-specific credit risk on MRBs |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance | (20) |  | (427) |  | 0 |
OCI before reclassifications | (65) |  | 407 |  | 100 |
Amounts reclassified from AOCI | 0 |  | 0 |  | 0 |
Total other comprehensive income (loss), net of tax | (65) |  | 407 |  | 100 |
Ending balance | (85) |  | (20) |  | (427) |
Effect of changes in instrument-specific credit risk on MRBs | Cumulative effect of adoption of long-duration contracts guidance |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance |  |  |  |  | (527) |
Defined Benefit Plans |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance | (75) |  | (151) |  | (204) |
OCI before reclassifications | 14 |  | 61 |  | 36 |
Amounts reclassified from AOCI | 1 |  | 15 |  | 17 |
Total other comprehensive income (loss), net of tax | 15 |  | 76 |  | 53 |
Ending balance | (60) |  | (75) |  | (151) |
Defined Benefit Plans | Cumulative effect of adoption of long-duration contracts guidance |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance |  |  |  |  | 0 |
Foreign Currency Translation |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance | (338) |  | (167) |  | (154) |
OCI before reclassifications | 80 |  | (171) |  | (13) |
Amounts reclassified from AOCI | 0 |  | 0 |  | 0 |
Total other comprehensive income (loss), net of tax | 80 |  | (171) |  | (13) |
Ending balance | (258) |  | (338) |  | (167) |
Foreign Currency Translation | Cumulative effect of adoption of long-duration contracts guidance |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance |  |  |  |  | 0 |
Other |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance | (1) |  | (1) |  | (1) |
OCI before reclassifications | 0 |  | 0 |  | 0 |
Amounts reclassified from AOCI | 0 |  | 0 |  | 0 |
Total other comprehensive income (loss), net of tax | 0 |  | 0 |  | 0 |
Ending balance | $ (1) |  | $ (1) |  | (1) |
Other | Cumulative effect of adoption of long-duration contracts guidance |  |  |  |  |  |
Changes in balances of each component of AOCI, net of tax |  |  |  |  |  |
Beginning balance |  |  |  |  | $ 0 |
[1] | Certain prior period amounts have been restated. See Note 3 for more information.
[2] | Certain prior period amounts have been restated. See Note 3 for more information.
[3] | Certain prior period amounts have been restated. See Note 3 for more information.

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