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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
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 2,565 $ 1,962
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 1,900 1,700
Carrying Amount Of Investments In Qualified Affordable Housing Projects 13 20
Income Tax Credits And Other Tax Benefits From Qualified Affordable Housing Projects $ 2 $ 1