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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
Mar. 31, 2024
Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax expense (benefit) $ (5) $ (4)
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax 0 0
Net of tax and noncontrolling interest 20 (33)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (1) 3
Realized Investment Gains (Losses) 1 (4)
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 (1) 4
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (1) 4
Realized Investment Gains (Losses) (1) 4
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
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, before Tax, after Reclassification Adjustment 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 (1) 3
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
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
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 0 0
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
Prior service cost 0 0
Actuarial gains (losses) 0 0
Total before tax 0 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ 0 $ 0