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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income from domestic operations $ 2,910 $ 2,222 $ 2,644
Losses from foreign operations (14) 102 (84)
Current State and Local Tax Expense (Benefit) 4 3 5
Deferred Tax Assets, Operating Loss Carryforwards 29 11  
Deferred Tax Assets, Valuation Allowance 7 4  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability 8    
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount (8) (6) 0
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount 5 8 0
Income Tax Examination, Penalties and Interest Expense 1 1 1
Income Tax Examination, Interest Accrued 0 0 $ 0
Non-insurance carryback [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount   $ (11)  
Foreign Tax Authority [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards 29    
Deferred Tax Assets, Valuation Allowance $ 7