Loans - Purchased, Sold and Reclassified to Held-for-Sale (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 242	$ 285
Sales	9,171	9,754
Retained loans reclassified to held-for-sale	357	349
Consumer, excluding credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	79	119
Sales	0	47
Retained loans reclassified to held-for-sale	43	76
Excluded retained loans purchased from correspondents that were originated in accordance with the Firm's underwriting standards	663	3,200
Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	0
Sales	0	0
Retained loans reclassified to held-for-sale	0	0
Wholesale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	163	166
Sales	9,171	9,707
Retained loans reclassified to held-for-sale	$ 314	$ 273