INCOME TAXES - Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets
Credit loss deduction	$ 5,449	$ 5,162
Deferred compensation and employee benefits	2,771	2,059
U.S. tax on non-U.S. earnings	1,349	1,191
Investment and loan basis differences	4,706	5,218
Tax credit and net operating loss carry-forwards	15,250	14,623
Fixed assets and leases	4,297	3,551
Other deferred tax assets	5,235	4,055
Gross deferred tax assets	39,057	35,859
Valuation allowance	3,572	2,438
Deferred tax assets after valuation allowance	35,485	33,421
Deferred tax liabilities
Intangibles and leases	(2,333)	(2,271)
Non-U.S. withholding taxes	(951)	(1,142)
Debt issuances	(113)	(595)
Derivatives	(587)	(69)
Other deferred tax liabilities	(1,893)	(1,672)
Gross deferred tax liabilities	(5,877)	(5,749)
Net deferred tax assets	$ 29,608	$ 27,672