Loans - Purchased, Sold and Reclassified to Held-for-Sale (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 848	$ 601	$ 1,558	$ 151,243
Sales	12,962	14,394	41,464	33,712
Retained loans reclassified to held-for-sale	461	227	2,178	1,436
Consumer, excluding credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	180	62	536	92,143
Sales	2,474	1,318	10,440	1,756
Retained loans reclassified to held-for-sale	330	33	1,499	157
Excluded retained loans purchased from correspondents that were originated in accordance with the Firm's underwriting standards	181	1,900	465	4,200
Consumer, excluding credit card | First Republic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases		91,900		91,900
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	668	539	1,022	59,100
Sales	10,488	13,076	31,024	31,956
Retained loans reclassified to held-for-sale	$ 131	194	$ 679	1,279
Wholesale | First Republic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases		$ 58,400		$ 58,400