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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Variable Interest Entity [Line Items]      
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets $ 2,372   $ 1,962
Maximum [Member]      
Variable Interest Entity [Line Items]      
Income Tax Credits And Other Tax Benefits From Qualified Affordable Housing Projects 1 $ 1  
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   1,700
Carrying Amount Of Investments In Qualified Affordable Housing Projects 18   $ 20
Maximum exposure to loss related to unconsolidated VIE's $ 0