Loans - Purchased, Sold and Reclassified to Held-for-Sale (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 1,201	$ 412	$ 1,486	$ 829
Sales	12,087	8,751	21,841	14,662
Retained loans reclassified to held-for-sale	481	979	830	1,913
Consumer, excluding credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	973	111	1,092	302
Sales	82	0	129	181
Retained loans reclassified to held-for-sale	66	87	142	249
Excluded retained loans purchased from correspondents that were originated in accordance with the Firm's underwriting standards	6,000	5,000	9,200	12,000
Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	0	0	0
Sales	0	0	0	0
Retained loans reclassified to held-for-sale	0	0	0	0
Wholesale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	228	301	394	527
Sales	12,005	8,751	21,712	14,481
Retained loans reclassified to held-for-sale	$ 415	$ 892	$ 688	$ 1,664