Loans - Purchased, Sold and Reclassified to Held-for-Sale (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 321	$ 257
Sales	11,273	11,715
Retained loans reclassified to held-for-sale	401	397
Consumer, excluding credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	191	127
Sales	0	0
Retained loans reclassified to held-for-sale	55	44
Excluded retained loans purchased from correspondents that were originated in accordance with the Firm's underwriting standards	911	216
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	130	130
Sales	11,273	11,715
Retained loans reclassified to held-for-sale	$ 346	$ 353