Quarterly report pursuant to Section 13 or 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
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]    
Allowance for loan and lease losses, beginning of the period $ 18,802 $ 12,358
Loans and leases charged off (1,186) (1,438)
Recoveries of loans and leases previously charged off 363 316
Net charge-offs (823) (1,122)
Provision for loan and lease losses (1,811) 4,525
Other 0 5
Allowance for loan and lease losses, end of the period 16,168 15,766
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]    
Reserve for unfunded lending commitments, beginning balance 1,878 1,123
Provision for unfunded lending commitments (49) 236
Other   1
Reserve for unfunded lending commitments, ending balance 1,829 1,360
Allowance for credit losses 17,997 17,126
Consumer real estate    
Allowance for Loan and Lease Losses [Roll Forward]    
Allowance for loan and lease losses, beginning of the period 858 440
Loans and leases charged off (15) (35)
Recoveries of loans and leases previously charged off 54 47
Net charge-offs 39 12
Provision for loan and lease losses (207) 351
Other (1) 5
Allowance for loan and lease losses, end of the period 689 808
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]    
Reserve for unfunded lending commitments, beginning balance 137 119
Provision for unfunded lending commitments (13) 30
Other   0
Reserve for unfunded lending commitments, ending balance 124 149
Allowance for credit losses 813 957
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 7,430
Loans and leases charged off (977) (1,121)
Recoveries of loans and leases previously charged off 245 237
Net charge-offs (732) (884)
Provision for loan and lease losses (536) 1,712
Other 1 0
Allowance for loan and lease losses, end of the period 7,946 8,258
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]    
Reserve for unfunded lending commitments, beginning balance 0 0
Provision for unfunded lending commitments 0 0
Other   0
Reserve for unfunded lending commitments, ending balance 0 0
Allowance for credit losses 7,946 8,258
Commercial    
Allowance for Loan and Lease Losses [Roll Forward]    
Allowance for loan and lease losses, beginning of the period 8,731 4,488
Loans and leases charged off (194) (282)
Recoveries of loans and leases previously charged off 64 32
Net charge-offs (130) (250)
Provision for loan and lease losses (1,068) 2,462
Other 0 0
Allowance for loan and lease losses, end of the period 7,533 6,700
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]    
Reserve for unfunded lending commitments, beginning balance 1,741 1,004
Provision for unfunded lending commitments (36) 206
Other   1
Reserve for unfunded lending commitments, ending balance 1,705 1,211
Allowance for credit losses $ 9,238 $ 7,911