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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income from domestic operations $ 2,222 $ 2,644 $ 1,753
Losses from foreign operations (102) 84 0
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount (6) 0 (39)
Current State and Local Tax Expense (Benefit) 3 5 4
Deferred Tax Assets, Operating Loss Carryforwards 11 84  
Deferred Tax Assets, Valuation Allowance 4 4  
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount (11)    
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount 8 0 0
Income Tax Examination, Penalties and Interest Expense 1 1 0
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 6    
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 11    
Deferred Tax Assets, Valuation Allowance $ 4    
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income Taxes Receivable, Current     $ 5