Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period $ 9,601 $ 10,393 $ 11,237
Loans and leases charged off (5,646) (5,402) (5,619)
Recoveries of loans and leases previously charged off 1,998 1,639 1,640
Net charge-offs (3,648) (3,763) (3,979)
Provision (benefit) for loan and lease losses 3,574 3,262 3,381
Other (111) (291) (246)
Allowance for loan and lease losses, end of the period 9,416 9,601 10,393
Reserve for unfunded lending commitments, beginning of the period 10,398 11,170  
Provision for unfunded lending commitments 3,590 3,282 3,396
Reserve for unfunded lending commitments, end of the period 10,229 10,398 11,170
Unfunded loan commitments      
Allowance for Loan and Lease Losses [Roll Forward]      
Reserve for unfunded lending commitments, beginning of the period 797 777 762
Provision for unfunded lending commitments 16 20 15
Reserve for unfunded lending commitments, end of the period 813 797 777
Consumer Real Estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period 928 1,720 2,750
Loans and leases charged off (522) (690) (770)
Recoveries of loans and leases previously charged off 927 664 657
Net charge-offs 405 (26) (113)
Provision (benefit) for loan and lease losses (680) (492) (710)
Other (107) (274) (207)
Allowance for loan and lease losses, end of the period 546 928 1,720
Reserve for unfunded lending commitments, beginning of the period 928 1,720  
Reserve for unfunded lending commitments, end of the period 546 928 1,720
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
Provision for unfunded lending commitments 0 0 0
Reserve for unfunded lending commitments, end of the period 0 0 0
Credit card and other consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period 3,874 3,663 3,229
Loans and leases charged off (4,302) (4,037) (3,774)
Recoveries of loans and leases previously charged off 911 823 809
Net charge-offs (3,391) (3,214) (2,965)
Provision (benefit) for loan and lease losses 3,512 3,441 3,437
Other 1 (16) (38)
Allowance for loan and lease losses, end of the period 3,996 3,874 3,663
Reserve for unfunded lending commitments, beginning of the period 3,874 3,663  
Reserve for unfunded lending commitments, end of the period 3,996 3,874 3,663
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
Provision for unfunded lending commitments 0 0 0
Reserve for unfunded lending commitments, end of the period 0 0 0
Commercial      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period 4,799 5,010 5,258
Loans and leases charged off (822) (675) (1,075)
Recoveries of loans and leases previously charged off 160 152 174
Net charge-offs (662) (523) (901)
Provision (benefit) for loan and lease losses 742 313 654
Other (5) (1) (1)
Allowance for loan and lease losses, end of the period 4,874 4,799 5,010
Reserve for unfunded lending commitments, beginning of the period 5,596 5,787  
Reserve for unfunded lending commitments, end of the period 5,687 5,596 5,787
Commercial | Unfunded loan commitments      
Allowance for Loan and Lease Losses [Roll Forward]      
Reserve for unfunded lending commitments, beginning of the period 797 777 762
Provision for unfunded lending commitments 16 20 15
Reserve for unfunded lending commitments, end of the period $ 813 $ 797 $ 777