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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net income tax expense from income tax reform $ (39) $ 877 $ 0
Net income tax expense from income tax reform, reduction in deferred tax asset   821  
Net income tax expense from income tax reform, reduction in deferred tax asset from sequestration fee payable (56) 56  
Tax Adjustments, Settlements, and Unusual Provisions 17    
Deferred Tax Assets, Tax Credit Carryforwards 841    
Income from domestic operations 1,753 704 521
Losses from foreign operations 0 19 74
Stock-based compensation 11 0 0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount (5) (15) 0
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount 0 0 79
Income Tax Benefit (Expense) from Investment Tax Credit, Including Impairment     113
Sale of HFPI and foreign rate differential 0 (5) 37
Operating Loss Carryforwards $ 521 710  
Valuation Allowance, Methodologies and Assumptions A deferred tax valuation allowance has not been recorded because the Company believes the deferred tax assets will more likely than not be realized.    
Income Tax Examination, Penalties and Interest Expense $ 0 0 0
Income Tax Examination, Interest Accrued 0 $ 0  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Run-Off U.K. Property and Casualty Subsidiaries      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Total tax benefit from sale of business     $ 76
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]      
Operating Loss Carryforwards 477    
Income Taxes Receivable, Current $ 5