Annual report pursuant to Section 13 and 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Allowance by Portfolio Segment (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Allowance by Portfolio Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period   $ 9,601 $ 10,393
Loans and leases charged off $ (5,419) (5,646) (5,402)
Recoveries of loans and leases previously charged off 1,298 1,998 1,639
Net charge-offs (4,121) (3,648) (3,763)
Provision for loan and lease losses 10,565 3,574 3,262
Other 0 (111) (291)
Allowance for loan and lease losses, end of the period 18,802 9,416 9,601
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 1,123 797 777
Provision for unfunded lending commitments 755 16 20
Reserve for unfunded lending commitments, ending balance 1,878 813 797
Allowance for credit losses 20,680 10,229 10,398
Consumer real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period   928 1,720
Loans and leases charged off (98) (522) (690)
Recoveries of loans and leases previously charged off 201 927 664
Net charge-offs 103 405 (26)
Provision for loan and lease losses 307 (680) (492)
Other 8 (107) (274)
Allowance for loan and lease losses, end of the period 858 546 928
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 119 0 0
Provision for unfunded lending commitments 18 0 0
Reserve for unfunded lending commitments, ending balance 137 0 0
Allowance for credit losses 995 546 928
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
Loans and leases charged off (3,646) (4,302) (4,037)
Recoveries of loans and leases previously charged off 891 911 823
Net charge-offs (2,755) (3,391) (3,214)
Provision for loan and lease losses 4,538 3,512 3,441
Other 0 1 (16)
Allowance for loan and lease losses, end of the period 9,213 3,996 3,874
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 0 0 0
Provision for unfunded lending commitments 0 0 0
Reserve for unfunded lending commitments, ending balance 0 0 0
Allowance for credit losses 9,213 3,996 3,874
Commercial      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period   4,799 5,010
Loans and leases charged off (1,675) (822) (675)
Recoveries of loans and leases previously charged off 206 160 152
Net charge-offs (1,469) (662) (523)
Provision for loan and lease losses 5,720 742 313
Other (8) (5) (1)
Allowance for loan and lease losses, end of the period 8,731 4,874 4,799
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 1,004 797 777
Provision for unfunded lending commitments 737 16 20
Reserve for unfunded lending commitments, ending balance 1,741 813 797
Allowance for credit losses 10,472 $ 5,687 $ 5,596
Cumulative Effect, Period of Adoption, Adjusted Balance      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period 12,358    
Cumulative Effect, Period of Adoption, Adjusted Balance | Consumer real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period 440    
Cumulative Effect, Period of Adoption, Adjusted Balance | Credit card and other consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period 7,430    
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period $ 4,488