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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Variable Interest Entity [Line Items]    
Outstanding Principal Balance of Surplus Note Issued By LRCVV And Held By LFLLCI $ 573  
Long-Term Senior Note Issued In Exchange For Corporate Bond Afs Security 275  
Outstanding Principal Balance of Long-Term Senior Note Issued In Exchange For Corporate Bond AFS Security 854  
Maxiumum Principal Balance of Long Term Senior Note Issued In Exchange For Corporate Bond AFS Security 1,100  
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets 2,296 $ 2,230
Limited Partnerships and Limited Liability Companies [Member]    
Variable Interest Entity [Line Items]    
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets 1,500 1,300
Carrying Amount Of Investments In Qualified Affordable Housing Projects 31 37
Income Tax Credits And Other Tax Benefits From Qualified Affordable Housing Projects 3 3
Credit Linked Note Structure April 2007 [Member]    
Variable Interest Entity [Line Items]    
CLN $ 0 $ 200