Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles - Loans and Leases and Allowance for Credit Losses (Details)

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Summary of Significant Accounting Principles - Loans and Leases and Allowance for Credit Losses (Details)
$ in Millions
 12 Months Ended
Jan. 01, 2020
Dec. 31, 2022
USD ($)
portfolioSegment
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Past Due [Line Items]          
Threshold period past due for nonperforming status of financing receivables   90 days 90 days    
Number of portfolio segments | portfolioSegment   3      
Reserve for unfunded lending commitments   $ 1,540 $ 1,456 $ 1,878 $ 1,123
Threshold period of collateral-dependent troubled debt restructurings   180 days      
Cumulative Effect, Period of Adoption, Adjustment          
Financing Receivable, Past Due [Line Items]          
Allowance for credit losses         3,300
Loans and leases receivable, percentage increase in allowance 32.00%        
Allowance on nonperforming loans         2,900
Reserve for unfunded lending commitments         $ 310
Consumer Portfolio Segment          
Financing Receivable, Past Due [Line Items]          
Threshold period past due for nonperforming status of financing receivables   90 days