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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Variable Interest Entity [Line Items]      
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets $ 3,220   $ 2,565
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 1,900   1,900
Carrying Amount Of Investments In Qualified Affordable Housing Projects 11   $ 13
Maximum exposure to loss related to unconsolidated VIE's $ 0