Loans - Wholesale Loan Portfolio, Geographic Distribution and Delinquency (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Retained loans	$ 1,089,598	$ 1,010,206	$ 960,506
Wholesale
Financing Receivable, Past Due [Line Items]
Retained loans	603,670	560,354	$ 514,947
Wholesale | Criticized nonaccrual
Financing Receivable, Past Due [Line Items]
Retained loans	1,963	2,054
Wholesale | Current
Financing Receivable, Past Due [Line Items]
Retained loans	599,009	554,980
Wholesale | 30–89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Retained loans	2,544	3,114
Wholesale | 90 or more days past due and still accruing
Financing Receivable, Past Due [Line Items]
Retained loans	154	206
Wholesale | 90 or more days past due | Paycheck Protection Program (PPP)
Financing Receivable, Past Due [Line Items]
Retained loans	0	127
Wholesale | U.S. offices
Financing Receivable, Past Due [Line Items]
Retained loans	479,589	437,931
Wholesale | Non-U.S. offices
Financing Receivable, Past Due [Line Items]
Retained loans	124,081	122,423
Secured by real estate | Wholesale
Financing Receivable, Past Due [Line Items]
Retained loans	126,732	118,835
Secured by real estate | Wholesale | Criticized nonaccrual
Financing Receivable, Past Due [Line Items]
Retained loans	246	326
Secured by real estate | Wholesale | Current
Financing Receivable, Past Due [Line Items]
Retained loans	126,083	118,163
Secured by real estate | Wholesale | 30–89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Retained loans	402	331
Secured by real estate | Wholesale | 90 or more days past due and still accruing
Financing Receivable, Past Due [Line Items]
Retained loans	1	15
Secured by real estate | Wholesale | U.S. offices
Financing Receivable, Past Due [Line Items]
Retained loans	123,740	115,732
Secured by real estate | Wholesale | Non-U.S. offices
Financing Receivable, Past Due [Line Items]
Retained loans	2,992	3,103
Commercial and industrial | Wholesale
Financing Receivable, Past Due [Line Items]
Retained loans	167,660	145,691
Commercial and industrial | Wholesale | Criticized nonaccrual
Financing Receivable, Past Due [Line Items]
Retained loans	1,018	969
Commercial and industrial | Wholesale | Current
Financing Receivable, Past Due [Line Items]
Retained loans	165,415	143,459
Commercial and industrial | Wholesale | 30–89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Retained loans	1,127	1,193
Commercial and industrial | Wholesale | 90 or more days past due and still accruing
Financing Receivable, Past Due [Line Items]
Retained loans	100	70
Commercial and industrial | Wholesale | U.S. offices
Financing Receivable, Past Due [Line Items]
Retained loans	125,324	106,449
Commercial and industrial | Wholesale | Non-U.S. offices
Financing Receivable, Past Due [Line Items]
Retained loans	42,336	39,242
Other | Wholesale
Financing Receivable, Past Due [Line Items]
Retained loans	309,278	295,828
Other | Wholesale | Criticized nonaccrual
Financing Receivable, Past Due [Line Items]
Retained loans	699	759
Other | Wholesale | Current
Financing Receivable, Past Due [Line Items]
Retained loans	307,511	293,358
Other | Wholesale | 30–89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Retained loans	1,015	1,590
Other | Wholesale | 90 or more days past due and still accruing
Financing Receivable, Past Due [Line Items]
Retained loans	53	121
Other | Wholesale | U.S. offices
Financing Receivable, Past Due [Line Items]
Retained loans	230,525	215,750
Other | Wholesale | Non-U.S. offices
Financing Receivable, Past Due [Line Items]
Retained loans	$ 78,753	$ 80,078