Loans - Purchased, Sold and Reclassified to Held-for-Sale (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Purchases	$ 152,505	$ 2,713	$ 1,637
Sales	46,151	44,818	31,821
Retained loans reclassified to held-for-sale	1,760	1,284	3,403
Consumer, excluding credit card
Loans and Leases Receivable Disclosure [Line Items]
Purchases	92,205	1,625	515
Sales	2,202	2,884	799
Retained loans reclassified to held-for-sale	274	229	1,225
Excluded purchases of retained loans predominantly sourced through the correspondent origination channel and underwritten in accordance with Firm standards	5,100	12,400	25,800
Consumer, excluding credit card | First Republic
Loans and Leases Receivable Disclosure [Line Items]
Purchases	91,900
Credit card
Loans and Leases Receivable Disclosure [Line Items]
Purchases	0	0	0
Sales	0	0	0
Retained loans reclassified to held-for-sale	0	0	0
Wholesale
Loans and Leases Receivable Disclosure [Line Items]
Purchases	60,300	1,088	1,122
Sales	43,949	41,934	31,022
Retained loans reclassified to held-for-sale	1,486	$ 1,055	$ 2,178
Wholesale | First Republic
Loans and Leases Receivable Disclosure [Line Items]
Purchases	$ 59,200