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Comprehensive Income - Schedule of Amounts Reclassed Out of Each Component of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) $ (2) $ (2) $ (7) $ (6)
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax 0 0 0 0
Net of tax and noncontrolling interest (1) (13) 19 (47)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (9) 2 (10) 5
Realized Investment Gains (Losses) 4 (3) 4 (8)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net of tax and noncontrolling interest (4) 3 (5) 6
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (4) 3 (5) 6
Realized Investment Gains (Losses) (4) 3 (4) 8
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax 0 0 0 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0 0 0
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, before Tax, after Reclassification Adjustment 0 (1) 0 0
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net of tax and noncontrolling interest (9) 2 (9) 5
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) 0 1 0 2
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit)     0  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Financial Liability, Fair Value Option, Including Portion Attributable to Noncontrolling Interest [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) 0 0   0
Other Postretirement Benefits Plan [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (5) 0 (5) (1)
Other Postretirement Benefits Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) 0 0 0 0
Prior service cost 0 0 0 0
Actuarial gains (losses) 0 0 0 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax 5   5  
Total before tax (5) 0 (5) (1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ (5) $ 0 $ (5) $ (1)