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, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period $ 18,802 $ 9,416 $ 9,601
Loans and leases charged off (3,797) (5,419) (5,646)
Recoveries of loans and leases previously charged off 1,554 1,298 1,998
Net charge-offs (2,243) (4,121) (3,648)
Provision for loan and lease losses (4,173) 10,565 3,574
Other 1 0 (111)
Allowance for loan and lease losses, end of the period 12,387 18,802 9,416
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 1,878 813 797
Provision for unfunded lending commitments (421) 755 16
Other (1)    
Reserve for unfunded lending commitments, ending balance 1,456 1,878 813
Allowance for credit losses 13,843 20,680 10,229
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  
Allowance for loan and lease losses, end of the period     12,358
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance   1,123  
Reserve for unfunded lending commitments, ending balance     1,123
Consumer real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period 858 546 928
Loans and leases charged off (78) (98) (522)
Recoveries of loans and leases previously charged off 225 201 927
Net charge-offs 147 103 405
Provision for loan and lease losses (449) 307 (680)
Other 1 8 (107)
Allowance for loan and lease losses, end of the period 557 858 546
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 137 0 0
Provision for unfunded lending commitments (41) 18 0
Other 0    
Reserve for unfunded lending commitments, ending balance 96 137 0
Allowance for credit losses 653 995 546
Consumer real estate | 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   440  
Allowance for loan and lease losses, end of the period     440
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance   119  
Reserve for unfunded lending commitments, ending balance     119
Credit card and other consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period 9,213 3,996 3,874
Loans and leases charged off (3,000) (3,646) (4,302)
Recoveries of loans and leases previously charged off 1,006 891 911
Net charge-offs (1,994) (2,755) (3,391)
Provision for loan and lease losses (744) 4,538 3,512
Other 1 0 1
Allowance for loan and lease losses, end of the period 6,476 9,213 3,996
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
Other 0    
Reserve for unfunded lending commitments, ending balance 0 0 0
Allowance for credit losses 6,476 9,213 3,996
Credit card and other consumer | 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   7,430  
Allowance for loan and lease losses, end of the period     7,430
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance   0  
Reserve for unfunded lending commitments, ending balance     0
Commercial      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses, beginning of the period 8,731 4,874 4,799
Loans and leases charged off (719) (1,675) (822)
Recoveries of loans and leases previously charged off 323 206 160
Net charge-offs (396) (1,469) (662)
Provision for loan and lease losses (2,980) 5,720 742
Other (1) (8) (5)
Allowance for loan and lease losses, end of the period 5,354 8,731 4,874
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 1,741 813 797
Provision for unfunded lending commitments (380) 737 16
Other (1)    
Reserve for unfunded lending commitments, ending balance 1,360 1,741 813
Allowance for credit losses $ 6,714 10,472 5,687
Commercial | 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   4,488  
Allowance for loan and lease losses, end of the period     4,488
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance   $ 1,004  
Reserve for unfunded lending commitments, ending balance     $ 1,004