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Accumulated Other Comprehensive Income Loss - Reclassifications from AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized losses | $ (59) | $ (64) | $ (31) | $ (71)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 912 | 672 | 1,823 | 1,325
Income tax expense | 174 | 125 | 332 | 243
Net income | 738 | 547 | 1,491 | 1,082
Net Investment Income | 602 | 540 | 1,195 | 1,055
Interest Expense | 50 | 50 | 100 | 100
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net income | (62) | (24) | (74) | (51)
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized losses | (70) | (21) | (77) | (48)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | (70) | (21) | (77) | (48)
Income tax expense | (15) | (4) | (16) | (10)
Net income | (55) | (17) | (61) | (38)
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 | 0 | 0 | 0 | (3)
Income tax expense | 0 | 0 | 0 | (1)
Net income | 0 | 0 | 0 | (2)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest rate swaps |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net Investment Income | (8) | (7) | (15) | (15)
Interest Expense | 5 | 4 | 9 | 7
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 | 3 | 6 | 5
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 | (10) | (8) | (19) | (16)
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 | (9) | (7) | (16) | (13)
Income tax expense | (2) | (1) | (3) | (3)
Net income | $ (7) | (6) | $ (13) | (10)
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] |  |  |  |
Net realized losses |  | (2) |  | (2)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  | (2) |  | (2)
Income tax expense |  | (1) |  | (1)
Net income |  | $ (1) |  | $ (1)

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