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Loans and the Allowance for Credit Losses (Analysis of the Allowance for Credit Losses by Portfolio Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Allowance for Loan and Lease Losses [Roll Forward]        
Total allowance for loan losses $ 1,425 $ 1,597 $ 1,425 $ 1,597
Provision (credit) for loan and lease losses 47 (332) 30 (440)
Loan losses:        
Charge-offs (70) (83) (147) (197)
Recoveries 32 36 63 67
Net loan losses (38) (47) (84) (130)
Allowance for loan losses, beginning of period 1,416 1,976 1,479 2,167
Reserve For Unfunded Credit Commitments [Roll Forward]        
Reserve For Unfunded Credit Commitments, beginning of period 76 92 95 126
Provision (credit) for unfunded credit losses 13 (5) (6) (39)
Reserve For Unfunded Credit Commitments, end of period 89 87 89 87
Allowance for Credit Losses, end of period 1,514 1,684 1,514 1,684
Commercial Portfolio Segment [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Total allowance for loan losses 597 858 597 858
Provision (credit) for loan and lease losses (14) (203) (63) (286)
Loan losses:        
Charge-offs (22) (36) (48) (83)
Recoveries 13 15 26 31
Net loan losses (9) (21) (22) (52)
Allowance for loan losses, beginning of period 620 1,082 682 1,196
Reserve For Unfunded Credit Commitments [Roll Forward]        
Reserve For Unfunded Credit Commitments, beginning of period 52 67 58 97
Provision (credit) for unfunded credit losses 5 (6) (1) (36)
Reserve For Unfunded Credit Commitments, end of period 57 61 57 61
Allowance for Credit Losses, end of period 654 919 654 919
Total Investor Real Estate [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Total allowance for loan losses 91 91 91 91
Provision (credit) for loan and lease losses 15 (57) 11 (75)
Loan losses:        
Charge-offs 0 (4) 0 (19)
Recoveries 1 2 1 2
Net loan losses 1 (2) 1 (17)
Allowance for loan losses, beginning of period 75 150 79 183
Reserve For Unfunded Credit Commitments [Roll Forward]        
Reserve For Unfunded Credit Commitments, beginning of period 8 11 8 14
Provision (credit) for unfunded credit losses 2 2 2 (1)
Reserve For Unfunded Credit Commitments, end of period 10 13 10 13
Allowance for Credit Losses, end of period 101 104 101 104
Consumer Portfolio Segment [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Total allowance for loan losses 737 648 737 648
Provision (credit) for loan and lease losses 46 (72) 82 (79)
Loan losses:        
Charge-offs (48) (43) (99) (95)
Recoveries 18 19 36 34
Net loan losses (30) (24) (63) (61)
Allowance for loan losses, beginning of period 721 744 718 788
Reserve For Unfunded Credit Commitments [Roll Forward]        
Reserve For Unfunded Credit Commitments, beginning of period 16 14 29 15
Provision (credit) for unfunded credit losses 6 (1) (7) (2)
Reserve For Unfunded Credit Commitments, end of period 22 13 22 13
Allowance for Credit Losses, end of period $ 759 $ 661 $ 759 $ 661