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Fair Value (Table of reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, Beginning, Assets $ 1,676 $ 1,578
Reported in Net investment gains (losses) $ (4) $ 1
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net investment (losses) gains Net investment (losses) gains
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other comprehensive income (loss) Other comprehensive income (loss)
Reported in Other comprehensive income (loss) $ 48 $ (323)
Total realized and unrealized investment gains (losses) 57 (308)
Purchases 467 580
Sales (4) (10)
Settlements (97) (145)
Transfers into Level 3 34 85
Transfers out of Level 3 (119) (104)
Balance, Ending, Assets 2,014 1,676
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss) in the period (7) (4)
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Other comprehensive income (loss) in the period 48 (321)
Corporate and other bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, Beginning, Assets 810 937
Reported in Net investment gains (losses) 0 (2)
Reported in Other comprehensive income (loss) 38 (184)
Total realized and unrealized investment gains (losses) 38 (185)
Purchases 219 137
Sales 0 (5)
Settlements (33) (84)
Transfers into Level 3 11 10
Transfers out of Level 3 0 0
Balance, Ending, Assets 1,045 810
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss) in the period 0 0
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Other comprehensive income (loss) in the period 38 (183)
States, municipalities and political subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, Beginning, Assets 43 56
Reported in Net investment gains (losses) 0 0
Reported in Other comprehensive income (loss) 1 (13)
Total realized and unrealized investment gains (losses) 1 (13)
Purchases 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, Ending, Assets 44 43
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss) in the period 0 0
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Other comprehensive income (loss) in the period 1 (13)
Asset-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, Beginning, Assets 788 556
Reported in Net investment gains (losses) (4) 9
Reported in Other comprehensive income (loss) 9 (126)
Total realized and unrealized investment gains (losses) 25 (101)
Purchases 248 424
Sales 0 (2)
Settlements (64) (70)
Transfers into Level 3 23 75
Transfers out of Level 3 (119) (94)
Balance, Ending, Assets 901 788
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss) in the period 0 0
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Other comprehensive income (loss) in the period 9 (125)
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, Beginning, Assets 35 29
Reported in Net investment gains (losses) 0 (6)
Reported in Other comprehensive income (loss) 0 0
Total realized and unrealized investment gains (losses) (7) (9)
Purchases 0 19
Sales (4) (3)
Settlements 0 9
Transfers into Level 3 0 0
Transfers out of Level 3 0 (10)
Balance, Ending, Assets 24 35
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss) in the period (7) (4)
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Other comprehensive income (loss) in the period 0 0
Reported in Net investment income    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Reported in Net investment income 13 14
Reported in Net investment income | Corporate and other bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Reported in Net investment income 0 1
Reported in Net investment income | States, municipalities and political subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Reported in Net investment income 0 0
Reported in Net investment income | Asset-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Reported in Net investment income 20 16
Reported in Net investment income | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Reported in Net investment income $ (7) $ (3)