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Changes in and Reclassifications From Accumulated Other Comprehensive Income (Loss) - Reclassification from AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net realized losses $ (61) $ (188) $ (627)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 3,849 3,088 2,262
Income tax expense 738 584 443
Net investment income 2,568 2,305 2,177
Interest Expense 199 199 213
Net income (loss) 3,111 2,504 1,819
Amount Reclassified from AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net income (loss) (158) (136) (262)
Net Unrealized Gain (Loss) on Fixed Maturities, AFS | Amount Reclassified from AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net realized losses (169) (133) (282)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (169) (133) (282)
Income tax expense (35) (28) (59)
Net income (loss) (134) (105) (223)
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent | Amount Reclassified from AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net realized losses (1) (4) 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (1) (4) 0
Income tax expense 0 (1) 0
Net income (loss) (1) (3) 0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Amount Reclassified from AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 3 (1) 13
Income tax expense 1 0 3
Net income (loss) 2 (1) 10
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Amount Reclassified from AOCI | Interest rate swaps      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net investment income (25) (26) 6
Interest Expense 16 15 (2)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Amount Reclassified from AOCI | Foreign currency swaps      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net investment income 12 10 9
Amortization of prior service credit | Amount Reclassified from AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Insurance operating costs and other expenses 7 7 7
Amortization of actuarial loss | Amount Reclassified from AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Insurance operating costs and other expenses (39) (34) (69)
Pension and Other Postretirement Plan Adjustments | Amount Reclassified from AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (32) (27) (62)
Income tax expense (7) 0 (13)
Net income (loss) $ (25) $ (27) $ (49)