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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]    
Long-Term Senior Note Issued In Exchange For Corporate Bond Afs Security $ 275  
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets 1,951 $ 2,006
Non-Affiliated VIE One [Member]    
Variable Interest Entity [Line Items]    
Surplus notes 0  
Maximum exposure to loss related to unconsolidated VIE's 0  
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 1,700 1,400
Carrying Amount Of Investments In Qualified Affordable Housing Projects 20 31
Income Tax Credits And Other Tax Benefits From Qualified Affordable Housing Projects $ 1 $ 3