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General Adoption of New Accounting Pronouncements (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   $ 450
Adjustments for New Accounting Pronouncement [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative Effect on Retained Earnings, Tax $ 7  
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (417) $ (417)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Adjustments for New Accounting Pronouncement [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent $ (454)