v3.19.3.a.u2
Allowance For Credit Losses (Analysis Of The Allowance For Credit Losses By Portfolio Segment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan losses, beginning of period $ 840 $ 934 $ 1,091
Provision (credit) for loan losses (387) (229) (150)
Loan Losses:      
Charge-offs (443) (433) (434)
Recoveries 85 110 127
Net loan losses (358) (323) (307)
Total allowance for loan losses 869 840 934
Reserve For Unfunded Credit Commitments [Roll Forward]      
Reserve for unfunded credit commitments, beginning of year 51 53 69
Provision (credit) for unfunded credit losses (6) (2) (16)
Reserve for unfunded credit commitments, end of year 45 51 53
Allowance for Credit Losses, end of period 914 891 987
Portion of ending allowance for loan losses:      
Individually evaluated for impairment 153 132 226
Collectively evaluated for impairment 716 708 708
Total allowance for loan losses 869 840 934
Portion of loan portfolio ending balance:      
Individually evaluated for impairment 952 934 1,558
Collectively evaluated for impairment 82,011 82,218 78,389
Loans, net of unearned income 82,963 83,152 79,947
Commercial Portfolio Segment [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan losses, beginning of period 520 591 753
Provision (credit) for loan losses (138) (32) 28
Loan Losses:      
Charge-offs (150) (148) (176)
Recoveries 29 45 42
Net loan losses (121) (103) (134)
Total allowance for loan losses 537 520 591
Reserve For Unfunded Credit Commitments [Roll Forward]      
Reserve for unfunded credit commitments, beginning of year 47 49 64
Provision (credit) for unfunded credit losses (6) (2) (15)
Reserve for unfunded credit commitments, end of year 41 47 49
Allowance for Credit Losses, end of period 578 567 640
Portion of ending allowance for loan losses:      
Individually evaluated for impairment 120 104 171
Collectively evaluated for impairment 417 416 420
Total allowance for loan losses 537 520 591
Portion of loan portfolio ending balance:      
Individually evaluated for impairment 537 490 756
Collectively evaluated for impairment 45,302 44,725 41,884
Loans, net of unearned income 45,839 45,215 42,640
Total Investor Real Estate [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan losses, beginning of period 58 64 85
Provision (credit) for loan losses (16) 5 42
Loan Losses:      
Charge-offs (1) (9) (2)
Recoveries 4 8 23
Net loan losses 3 (1) 21
Total allowance for loan losses 45 58 64
Reserve For Unfunded Credit Commitments [Roll Forward]      
Reserve for unfunded credit commitments, beginning of year 4 4 5
Provision (credit) for unfunded credit losses 0 0 (1)
Reserve for unfunded credit commitments, end of year 4 4 4
Allowance for Credit Losses, end of period 49 62 68
Portion of ending allowance for loan losses:      
Individually evaluated for impairment 4 2 8
Collectively evaluated for impairment 41 56 56
Total allowance for loan losses 45 58 64
Portion of loan portfolio ending balance:      
Individually evaluated for impairment 34 25 96
Collectively evaluated for impairment 6,523 6,411 5,738
Loans, net of unearned income 6,557 6,436 5,834
Consumer Portfolio Segment [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan losses, beginning of period 262 279 253
Provision (credit) for loan losses (265) (202) (220)
Loan Losses:      
Charge-offs (292) (276) (256)
Recoveries 52 57 62
Net loan losses (240) (219) (194)
Total allowance for loan losses 287 262 279
Reserve For Unfunded Credit Commitments [Roll Forward]      
Reserve for unfunded credit commitments, beginning of year 0 0 0
Provision (credit) for unfunded credit losses 0 0 0
Reserve for unfunded credit commitments, end of year 0 0 0
Allowance for Credit Losses, end of period 287 262 279
Portion of ending allowance for loan losses:      
Individually evaluated for impairment 29 26 47
Collectively evaluated for impairment 258 236 232
Total allowance for loan losses 287 262 279
Portion of loan portfolio ending balance:      
Individually evaluated for impairment 381 419 706
Collectively evaluated for impairment 30,186 31,082 30,767
Loans, net of unearned income $ 30,567 $ 31,501 $ 31,473