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LOANS - Corporate Loans (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) category	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) category	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Receivables [Abstract]
Number of loan categories | category	2		2
Loans
Unallocated portfolio layer cumulative basis adjustments					$ (72)
Loans, net of unearned income	$ 733,905		$ 733,905		694,488
Lease financing
Loans
Loans, net of unearned income	200		200		300
Corporate loans
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	335,224		335,224		301,458
Unallocated portfolio layer cumulative basis adjustments	53		53		(72)
Loans, net of unearned income	335,277		335,277		301,386
Unearned income	(1,050)		(1,050)		(969)
Accrued interest receivable	2,000		2,000		2,000
Loans sold and/or reclassified to held-for-sale	1,300	$ 1,500	3,200	$ 3,800
Corporate loans | In North America offices
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	165,016		165,016		143,720
Corporate loans | In North America offices | Commercial and industrial
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	59,062		59,062		57,730
Corporate loans | In North America offices | Financial institutions
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	65,116		65,116		41,815
Corporate loans | In North America offices | Mortgage and real estate
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	17,885		17,885		18,411
Corporate loans | In North America offices | Installment and other
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	22,824		22,824		25,529
Corporate loans | In North America offices | Lease financing
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	129		129		235
Corporate loans | In offices outside North America
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	170,208		170,208		157,738
Corporate loans | In offices outside North America | Commercial and industrial
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	96,624		96,624		92,856
Corporate loans | In offices outside North America | Financial institutions
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	26,694		26,694		27,276
Corporate loans | In offices outside North America | Mortgage and real estate
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	9,746		9,746		8,136
Corporate loans | In offices outside North America | Installment and other
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	32,349		32,349		25,800
Corporate loans | In offices outside North America | Lease financing
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	44		44		40
Corporate loans | In offices outside North America | Government and official institutions
Loans
Corporate loans, net of unearned income, excluding portfolio layer cumulative basis adjustments	$ 4,751		$ 4,751		$ 3,630

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