CONDENSED PARENT COMPANY FINANCIAL STATEMENTS - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Trading account assets	$ 411,756	$ 334,114
Investments, net of allowance	519,085	526,582
Total assets	2,411,834	2,416,676	$ 2,291,000
Liabilities and equity
Trading account liabilities	155,345	170,647
Short-term borrowings	37,457	47,096
Long-term debt	286,619	271,606
Stockholders’ equity	206,251	201,838	$ 202,672
Total liabilities and equity	2,411,834	2,416,676
Other assets	95,963	103,743
Parent Company
Assets
Cash and due from banks	0	0
Cash and due from banks—intercompany	11	15
Deposits with banks—intercompany	3,000	3,000
Trading account assets	113	130
Trading account assets—intercompany	348	176
Investments, net of allowance	1	1
Advances to subsidiaries	150,845	146,843
Other assets, net of allowance	10,031	10,441
Other assets—intercompany	4,170	3,346
Total assets	387,514	384,968
Liabilities and equity
Trading account liabilities	34	23
Trading account liabilities—intercompany	266	581
Long-term debt	162,309	166,257
Other liabilities	2,560	2,321
Other liabilities—intercompany	168	35
Stockholders’ equity	205,453	201,189
Total liabilities and equity	387,514	384,968
Other assets	56,900	40,200
Parent Company | Up to 30 days
Liabilities and equity
Placements with term of less than 30 days	33,800	29,200
Parent Company | Subsidiary Holding Company
Assets
Investments in subsidiaries	172,125	172,721
Liabilities and equity
Advances from subsidiaries	8,677	6,629
Parent Company | Non-Bank Subsidiaries
Assets
Investments in subsidiaries	46,870	48,295
Liabilities and equity
Advances from subsidiaries	$ 8,047	$ 7,933