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Variable Interest Entities (VIEs) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Variable Interest Entity      
Unfunded commitments to fund tax credit entities $ 164    
Amount of financial or other support not contractually required provided by the Corporation to VIEs   $ 0 $ 0
Low Income Housing Tax Credit Entities      
Variable Interest Entity      
Exposure to loss as a result of involvement with VIEs 452 452  
Other Tax Credit Entities [Member]      
Variable Interest Entity      
Exposure to loss as a result of involvement with VIEs $ 12 $ 12