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Allowance for Loan and Lease Losses - Summary of Changes in Allowance for Loan and Lease Losses (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]        
Balance as beginning of the period     $ 7,502  
Balance at end of the period $ 7,219   7,219  
Total Allowance        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance as beginning of the period 7,368 $ 7,170 7,502 $ 6,503
Charge-offs (2,044) (2,110) (6,429) (6,203)
Recoveries 619 504 1,927 1,469
Net charge-offs (1,425) (1,606) (4,502) (4,734)
Provision (benefit) for loan and lease losses 1,275 1,844 4,232 5,633
Allowance build (release) for loan and lease losses (150) 238 (270) 899
Other changes 1 10 (13) 16
Balance at end of the period 7,219 7,418 7,219 7,418
Unfunded Lending Commitments Reserve        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance as beginning of the period 117 139 124 136
Provision (benefit) for loan and lease losses (7) (11) (14) (8)
Balance at end of the period 110 128 110 128
Combined Allowance And Unfunded Reserve [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at end of the period 7,329 7,546 7,329 7,546
Credit Card Portfolio Segment [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance as beginning of the period 5,624 5,210 5,648 4,606
Charge-offs (1,528) (1,471) (5,032) (4,644)
Recoveries 391 316 1,258 962
Net charge-offs (1,137) (1,155) (3,774) (3,682)
Provision (benefit) for loan and lease losses 1,031 1,466 3,658 4,580
Allowance build (release) for loan and lease losses (106) 311 (116) 898
Other changes 2 13 (12) 30
Balance at end of the period 5,520 5,534 5,520 5,534
Credit Card Portfolio Segment [Member] | Unfunded Lending Commitments Reserve        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance as beginning of the period 0 0 0 0
Provision (benefit) for loan and lease losses 0 0 0 0
Balance at end of the period 0 0 0 0
Credit Card Portfolio Segment [Member] | Combined Allowance And Unfunded Reserve [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at end of the period 5,520 5,534 5,520 5,534
Consumer Portfolio Segment [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance as beginning of the period 1,120 1,199 1,242 1,102
Charge-offs (469) (435) (1,314) (1,189)
Recoveries 207 159 631 463
Net charge-offs (262) (276) (683) (726)
Provision (benefit) for loan and lease losses 185 292 538 839
Allowance build (release) for loan and lease losses (77) 16 (145) 113
Other changes 0 (2) (54) (2)
Balance at end of the period 1,043 1,213 1,043 1,213
Consumer Portfolio Segment [Member] | Unfunded Lending Commitments Reserve        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance as beginning of the period 5 7 7 7
Provision (benefit) for loan and lease losses (1) 1 (3) 1
Balance at end of the period 4 8 4 8
Consumer Portfolio Segment [Member] | Combined Allowance And Unfunded Reserve [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at end of the period 1,047 1,221 1,047 1,221
Commercial Banking        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance as beginning of the period 624 758 611 793
Charge-offs (48) (168) (76) (334)
Recoveries 21 5 37 12
Net charge-offs (27) (163) (39) (322)
Provision (benefit) for loan and lease losses 60 75 85 210
Allowance build (release) for loan and lease losses 33 (88) 46 (112)
Other changes (1) (1) (1) (12)
Balance at end of the period 656 669 656 669
Commercial Banking | Unfunded Lending Commitments Reserve        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance as beginning of the period 112 132 117 129
Provision (benefit) for loan and lease losses (6) (12) (11) (9)
Balance at end of the period 106 120 106 120
Commercial Banking | Combined Allowance And Unfunded Reserve [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at end of the period 762 789 762 789
Other        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance as beginning of the period 0 3 1 2
Charge-offs 1 (36) (7) (36)
Recoveries 0 24 1 32
Net charge-offs 1 (12) (6) (4)
Provision (benefit) for loan and lease losses (1) 11 (49) 4
Allowance build (release) for loan and lease losses 0 (1) (55) 0
Other changes 0 0 54 0
Balance at end of the period 0 2 0 2
Other | Unfunded Lending Commitments Reserve        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance as beginning of the period 0 0 0 0
Provision (benefit) for loan and lease losses 0 0 0 0
Balance at end of the period 0 0 0 0
Other | Combined Allowance And Unfunded Reserve [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at end of the period $ 0 $ 2 0 $ 2
Home Loans Receivable | Other        
Allowance for Loan and Lease Losses [Roll Forward]        
Provision (benefit) for loan and lease losses     $ 46