Quarterly report pursuant to Section 13 or 15(d)

Allowance for Credit Losses - Allowance by Portfolio Segment (Details)

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Allowance for Credit Losses - Allowance by Portfolio Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period $ 10,260 $ 11,112 $ 10,393 $ 11,237
Loans and leases charged off (1,378) (1,350) (2,674) (2,660)
Recoveries of loans and leases previously charged off 382 442 767 818
Net charge-offs (996) (908) (1,907) (1,842)
Provision (benefit) for loan and lease losses 822 726 1,651 1,566
Other 0 0 (16) 2
Allowance for loan and lease losses, end of the period 10,050 10,875 10,050 10,875
Provision for unfunded lending commitments 827 726 1,661 1,561
Reserve for unfunded lending commitments, end of the period 10,837 11,632 10,837 11,632
Allowance for credit losses 10,837 11,632 10,837 11,632
Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Reserve for unfunded lending commitments, beginning of the period 782 757 777 762
Provision for unfunded lending commitments 5   10 (5)
Reserve for unfunded lending commitments, end of the period 787 757 787 757
Allowance for credit losses 782 757 777 762
Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off (36) (55) (71) (88)
Provision (benefit) for loan and lease losses (14) (24) (25) 44
Reserve for unfunded lending commitments, beginning of the period     289  
Reserve for unfunded lending commitments, end of the period 191   191  
Allowance for credit losses 191   289  
Financing receivable allowance sold 1 35 17 35
Consumer Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 1,530 2,565 1,720 2,750
Loans and leases charged off (137) (198) (311) (402)
Recoveries of loans and leases previously charged off 130 167 277 290
Net charge-offs (7) (31) (34) (112)
Provision (benefit) for loan and lease losses (121) (170) (249) (241)
Other 0 0 0 0
Allowance for loan and lease losses, end of the period 1,366 2,309 1,366 2,309
Reserve for unfunded lending commitments, end of the period 1,366 2,309 1,366 2,309
Allowance for credit losses 1,366 2,309 1,366 2,309
Consumer Real Estate | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Reserve for unfunded lending commitments, beginning of the period 0 0 0 0
Provision for unfunded lending commitments 0   0 0
Reserve for unfunded lending commitments, end of the period 0 0 0 0
Allowance for credit losses 0 0 0 0
Consumer Real Estate | Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off (36) (55) (71) (88)
Reserve for unfunded lending commitments, beginning of the period     289  
Reserve for unfunded lending commitments, end of the period 191   191  
Allowance for credit losses 191   289  
Credit card and other consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 3,720 3,329 3,663 3,229
Loans and leases charged off (1,033) (954) (2,039) (1,900)
Recoveries of loans and leases previously charged off 210 234 413 434
Net charge-offs (823) (720) (1,626) (1,466)
Provision (benefit) for loan and lease losses 878 776 1,754 1,619
Other (1) 1 (17) 4
Allowance for loan and lease losses, end of the period 3,774 3,386 3,774 3,386
Reserve for unfunded lending commitments, end of the period 3,774 3,386 3,774 3,386
Allowance for credit losses 3,774 3,386 3,774 3,386
Credit card and other consumer | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Reserve for unfunded lending commitments, beginning of the period 0 0 0 0
Provision for unfunded lending commitments 0   0 0
Reserve for unfunded lending commitments, end of the period 0 0 0 0
Allowance for credit losses 0 0 0 0
Credit card and other consumer | Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off 0 0 0 0
Commercial        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 5,010 5,218 5,010 5,258
Loans and leases charged off (208) (198) (324) (358)
Recoveries of loans and leases previously charged off 42 41 77 94
Net charge-offs (166) (157) (247) (264)
Provision (benefit) for loan and lease losses 65 120 146 188
Other 1 (1) 1 (2)
Allowance for loan and lease losses, end of the period 4,910 5,180 4,910 5,180
Reserve for unfunded lending commitments, end of the period 5,697 5,937 5,697 5,937
Allowance for credit losses 5,697 5,937 5,697 5,937
Commercial | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Reserve for unfunded lending commitments, beginning of the period 782 757 777 762
Provision for unfunded lending commitments 5   10 (5)
Reserve for unfunded lending commitments, end of the period 787 757 787 757
Allowance for credit losses 782 757 777 762
Commercial | Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off $ 0 $ 0 $ 0 $ 0