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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Variable Interest Entity [Line Items]          
Gains (losses) for consolidated variable interest entities $ 0 $ 0 $ 0 $ 0  
Carrying amount of other investments 3,950   3,950   $ 3,984
Income Tax Credits And Other Tax Benefits From Qualified Affordable Housing Projects 1   2    
Income tax expense       $ 1  
Maximum [Member]          
Variable Interest Entity [Line Items]          
Income tax expense   $ (1)      
Limited Partnerships and Limited Liability Companies [Member]          
Variable Interest Entity [Line Items]          
Carrying amount of other investments 2,600   2,600   2,100
Carrying Amount Of Investments In Qualified Affordable Housing Projects $ 6   $ 6   $ 7