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Loans and Allowance for Credit Losses - Summary of Financing Receivable credit losses charged-off by portfolio class (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]    
Originated in 2023 $ 47 $ 100
Originated in 2022 28 255
Originated in 2021 57 144
Originated in 2020 10 53
Originated in 2019 10 56
Originated prior to 2019 28 211
Revolving 328 885
Revolving converted to term   28
Total charge-offs 508 1,732
Commercial Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Originated in 2023 22 29
Originated in 2022 11 51
Originated in 2021 17 25
Originated in 2020 4 14
Originated in 2019 4 11
Originated prior to 2019 10 38
Revolving 42 115
Total charge-offs 110 283
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Originated in 2023 [1] 20 20
Originated in 2022 [1]   88
Originated in 2021 [1] 27 44
Originated in 2019 [1]   3
Originated prior to 2019 [1] 4 50
Total charge-offs [1] 51 205
Residential Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Originated in 2021 [2]   5
Originated in 2020 [2]   8
Originated in 2019 [2]   16
Originated prior to 2019 [2] 1 97
Total charge-offs [2] 1 126
Credit Card Receivable [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Revolving 259 716
Total charge-offs 259 716
Other Retail Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Originated in 2023 [3] 5 51
Originated in 2022 [3] 17 116
Originated in 2021 [3] 13 70
Originated in 2020 [3] 6 31
Originated in 2019 [3] 6 26
Originated prior to 2019 [3] 13 26
Revolving [3] 27 54
Revolving converted to term [3]   28
Total charge-offs [3] $ 87 $ 402
[1] Includes $91 million of charge-offs in the first quarter of 2023 related to uncollectible amounts on acquired loans.
[2] Includes $117 million of charge-offs related to balance sheet repositioning and capital management actions taken in the second quarter of 2023.
[3] Includes $192 million of charge-offs related to balance sheet repositioning and capital management actions taken in the second quarter of 2023.