FAIR VALUE ELECTIONS - Changes in Fair Value Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Total assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	$ (2,423)	$ (86)
Securities borrowed and purchased under agreements to resell
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	(109)	(87)
Trading account assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	(296)	59
Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	0	0
Total loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	(1,764)	(171)
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	(1,763)	(171)
Consumer loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	(1)	0
Total other assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	(254)	113
Mortgage servicing rights
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	201	43
Certain mortgage loans (HFS)
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	(455)	70
Total liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	16,926	1,026
Interest-bearing deposits
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	42	(118)
Securities loaned and sold under agreements to repurchase
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	110	66
Trading account liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	(239)	17
Short-term borrowings
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	1,424	675
Long-term debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions.
Gains (losses) from changes in fair value	$ 15,589	$ 386