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Accumulated Other Comprehensive Income Loss - Reclassifications from AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total | $ 672 | $ 554 | $ 1,325 | $ 1,095
Net Investment Income | 540 | 541 | 1,055 | 1,050
Interest Expense | 50 | 51 | 100 | 113
Income tax expense | 125 | 110 | 243 | 208
Net income | 547 | 444 | 1,082 | 887
Net realized losses | (64) | (338) | (71) | (483)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net income | (24) | (59) | (51) | (133)
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total | (21) | (65) | (48) | (152)
Income tax expense | (4) | (14) | (10) | (32)
Net income | (17) | (51) | (38) | (120)
Net realized losses | (21) | (65) | (48) | (152)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total | 0 | 6 | (3) | 14
Income tax expense | 0 | 1 | (1) | 3
Net income | 0 | 5 | (2) | 11
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest rate swaps [1] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net Investment Income | (7) | 5 | (15) | 14
Interest Expense | 4 | (1) | 7 | (4)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Currency Swap [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net Investment Income | 3 | 2 | 5 | 4
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Insurance operating costs and other expenses | 1 | 1 | 3 | 3
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Insurance operating costs and other expenses | (8) | (17) | (16) | (34)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Postretirement Plan Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total | (7) | (16) | (13) | (31)
Income tax expense | (1) | (3) | (3) | (7)
Net income | (6) | $ (13) | (10) | $ (24)
Reclassification out of Accumulated Other Comprehensive Income | AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total | (2) |  | (2) |
Income tax expense | (1) |  | (1) |
Net income | (1) |  | (1) |
Net realized losses | $ (2) |  | $ (2) |

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