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Loans - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]          
Accrued interest receivable $ 1,600   $ 1,600   $ 1,200
TDRs 2,300   2,300   1,600
Commitments to lend on loans modified in TDRs $ 214   $ 214   168
Financing Receivable, Pledged Status [Extensible Enumeration] Asset Pledged as Collateral [Member]   Asset Pledged as Collateral [Member]    
Net loans held for investment $ 291,734   $ 291,734   265,910
Federal Home Loan banks          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Line of Credit Facility, Remaining Borrowing Capacity 18,500   18,500   19,700
Net loans held for investment 9,800   9,800   10,300
Federal Reserve Discount Window          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Line of Credit Facility, Remaining Borrowing Capacity 21,600   21,600   19,600
Net loans held for investment 34,500   34,500   26,500
Credit Card and Consumer Banking | Performing          
Financing Receivable, Allowance for Credit Loss [Line Items]          
TDRs 1,400   1,400   1,100
Commercial Banking | Performing          
Financing Receivable, Allowance for Credit Loss [Line Items]          
TDRs 415   415   $ 192
Domestic credit card: | Domestic Credit Card and Commercial Banking Portfolios [Member]          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Revolving loans converted to term during period $ 51 $ 37 $ 383 $ 172