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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 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Allowance for Loan and Lease Losses [Roll Forward]        
Total allowance for loan losses $ 1,418 $ 1,428 $ 1,418 $ 1,428
Provision (credit) for loan and lease losses 103 (139) 133 (579)
Loan losses:        
Charge-offs (135) (59) (282) (256)
Recoveries 25 29 88 96
Net loan losses (110) (30) (194) (160)
Allowance for loan losses, beginning of period 1,425 1,597 1,479 2,167
Reserve For Unfunded Credit Commitments [Roll Forward]        
Reserve For Unfunded Credit Commitments, beginning of period 89 87 95 126
Provision (credit) for unfunded credit losses 32 (16) 26 (55)
Reserve For Unfunded Credit Commitments, end of period 121 71 121 71
Allowance for Credit Losses, end of period 1,539 1,499 1,539 1,499
Commercial Portfolio Segment [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Total allowance for loan losses 668 730 668 730
Provision (credit) for loan and lease losses 78 (122) 15 (408)
Loan losses:        
Charge-offs (20) (22) (68) (105)
Recoveries 13 16 39 47
Net loan losses (7) (6) (29) (58)
Allowance for loan losses, beginning of period 597 858 682 1,196
Reserve For Unfunded Credit Commitments [Roll Forward]        
Reserve For Unfunded Credit Commitments, beginning of period 57 61 58 97
Provision (credit) for unfunded credit losses 10 (7) 9 (43)
Reserve For Unfunded Credit Commitments, end of period 67 54 67 54
Allowance for Credit Losses, end of period 735 784 735 784
Total Investor Real Estate [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Total allowance for loan losses 99 89 99 89
Provision (credit) for loan and lease losses 8 (3) 19 (78)
Loan losses:        
Charge-offs 0 0 0 (19)
Recoveries 0 1 1 3
Net loan losses 0 1 1 (16)
Allowance for loan losses, beginning of period 91 91 79 183
Reserve For Unfunded Credit Commitments [Roll Forward]        
Reserve For Unfunded Credit Commitments, beginning of period 10 13 8 14
Provision (credit) for unfunded credit losses 7 (5) 9 (6)
Reserve For Unfunded Credit Commitments, end of period 17 8 17 8
Allowance for Credit Losses, end of period 116 97 116 97
Consumer Portfolio Segment [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Total allowance for loan losses 651 609 651 609
Provision (credit) for loan and lease losses 17 (14) 99 (93)
Loan losses:        
Charge-offs (115) (37) (214) (132)
Recoveries 12 12 48 46
Net loan losses (103) (25) (166) (86)
Allowance for loan losses, beginning of period 737 648 718 788
Reserve For Unfunded Credit Commitments [Roll Forward]        
Reserve For Unfunded Credit Commitments, beginning of period 22 13 29 15
Provision (credit) for unfunded credit losses 15 (4) 8 (6)
Reserve For Unfunded Credit Commitments, end of period 37 9 37 9
Allowance for Credit Losses, end of period $ 688 $ 618 $ 688 $ 618