Loans - Wholesale Loan Portfolio, Nonaccrual (Details) - Wholesale - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Nonaccrual [Line Items]
With an allowance	$ 1,425	$ 1,144
Without an allowance	658	910
Total nonaccrual loans	2,083	2,054
Secured by real estate
Financing Receivable, Nonaccrual [Line Items]
With an allowance	247	254
Without an allowance	81	72
Total nonaccrual loans	328	326
Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
With an allowance	656	604
Without an allowance	330	365
Total nonaccrual loans	986	969
Other
Financing Receivable, Nonaccrual [Line Items]
With an allowance	522	286
Without an allowance	247	473
Total nonaccrual loans	$ 769	$ 759