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Accumulated Other Comprehensive Income Loss - Reclassifications from AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized losses | $ (10) | $ (59) | $ (59) | $ (31)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 1,246 | 912 | 2,029 | 1,823
Income tax expense | 251 | 174 | 404 | 332
Net income | 995 | 738 | 1,625 | 1,491
Net Investment Income | 664 | 602 | 1,320 | 1,195
Interest Expense | 50 | 50 | 100 | 100
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net income | (25) | (62) | (35) | (74)
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized losses | (26) | (70) | (36) | (77)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | (26) | (70) | (36) | (77)
Income tax expense | (5) | (15) | (8) | (16)
Net income | (21) | (55) | (28) | (61)
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 | 3 | 0 | 7 | 0
Income tax expense | 0 | 0 | 1 | 0
Net income | 3 | 0 | 6 | 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) | (8) | (4) | (15)
Interest Expense | 3 | 5 | 6 | 9
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 | 2 | 3 | 5 | 6
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) | (10) | (19) | (19)
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) | (9) | (16) | (16)
Income tax expense | (2) | (2) | (3) | (3)
Net income | $ (7) | $ (7) | $ (13) | $ (13)

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