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Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income from domestic operations $ 704,000,000 $ 521,000,000 $ 1,517,000,000
Losses from foreign operations 19,000,000 (74,000,000) (39,000,000)
Net income tax expense from income tax reform 877,000,000 0 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    
AMT tax credits reclassified into income taxes receivables related to income tax reform 790,000,000    
Income taxes receivable from alternative minimum tax credits 790,000,000    
Income taxes receivable from alternative minimum tax credits, gross 846,000,000    
Income taxes receivable from alternative minimum tax credits, sequestration fee payable 56,000,000    
Foreign tax credit credit carryover, Expected tax benefit, gross 26,000,000 56,000,000  
Net operating loss carryover, Expected tax benefit, gross 710,000,000 1,458,000,000  
Stock-based compensation 15,000,000 0 0
Tax benefit from investment in solar energy partnerships 0 79,000,000 0
Total tax benefit from investment in solar energy partnerships   113,000,000  
Tax benefit related to sale of business (5,000,000) 37,000,000 $ 0
Income taxes receivable 811,000,000 141,000,000  
Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Foreign tax credit credit carryover, Expected tax benefit, gross 23    
Loss on sale of business 3,300,000,000    
Net operating loss carryover, Expected tax benefit, gross 437    
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   $ 76,000,000  
U.S.      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Operating loss carryforwards 3,380,000,000    
Net operating loss carryover, Expected tax benefit, gross 710,000,000    
U.S. | Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Operating loss carryforwards $ 437,000,000