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Accumulated Other Comprehensive Income Loss - Reclassifications from AOCI (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net realized gains (losses) | $ 28 | $ (7)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 911 | 653
Income tax expense | 158 | 118
Net Investment Income | 593 | 515
Interest Expense | 50 | 50
Net income | 753 | 535
Reclassification out of Accumulated Other Comprehensive Income |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net income | (12) | (28)
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net realized gains (losses) | (7) | (27)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | (7) | (27)
Income tax expense | (1) | (6)
Net income | (6) | (21)
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 | (3)
Income tax expense | 0 | (1)
Net income | 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 | (7) | (8)
Interest Expense | 4 | 3
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
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 | 2 | 2
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Insurance operating costs and other expenses | (9) | (8)
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 | (7) | (6)
Income tax expense | (1) | (1)
Net income | $ (6) | $ (5)

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