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Loans and Related Allowance for Credit Losses (Analysis of Changes in the Allowance for Credit Losses) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Changes in the Allowance for Credit Losses [Roll Forward]  
Portfolio changes $ 753
Economics 2,135
Ending balance 6,590
Cumulative Effect, Period of Adoption, Adjusted Balance  
Changes in the Allowance for Credit Losses [Roll Forward]  
Beginning balance 3,702
Ending balance $ 6,590