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Accumulated Other Comprehensive Income Loss - Reclassifications from AOCI (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net realized gains (losses) | $ (49) | $ 28
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 783 | 911
Income tax expense | 153 | 158
Net income | 630 | 753
Net Investment Income | 656 | 593
Interest Expense | 50 | 50
Reclassification out of Accumulated Other Comprehensive Income |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net income | (11) | (12)
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net realized gains (losses) | (10) | (7)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | (10) | (7)
Income tax expense | (2) | (1)
Net income | (8) | (6)
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 | 4 | 0
Income tax expense | 1 | 0
Net income | 3 | 0
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 | (2) | (7)
Interest Expense | 3 | 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 | 3
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) | (9)
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) | (7)
Income tax expense | (1) | (1)
Net income | $ (6) | $ (6)

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