DERIVATIVES - Cumulative Basis Adjustment (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivatives
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Available-for-sale debt securities (including $11,868 and $10,933 pledged to creditors as of December 31, 2023 and 2022, respectively), Loans, net of unearned income	Available-for-sale debt securities (including $11,868 and $10,933 pledged to creditors as of December 31, 2023 and 2022, respectively)
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Long-term debt (including $116,338 and $105,995 as of December 31, 2023 and 2022, respectively, at fair value)	Long-term debt (including $116,338 and $105,995 as of December 31, 2023 and 2022, respectively, at fair value)
Long-term debt, carrying amount of hedged liability	$ 141,449	$ 144,549
Long-term debt, cumulative fair value hedging adjustment increasing (decreasing) the carrying amount, active	(908)	(5,040)
Long-term debt, cumulative fair value hedging adjustment increasing (decreasing) the carrying amount, de-designated	(5,160)	(3,399)
Hedged asset, physical commodities inventory	8,000
Physical commodities inventory, adjustments	1,200
Cumulative basis adjustment within active hedges	248	(91)
Cumulative basis adjustment within de-designated hedges	(51)	(309)
Amount of designated hedged items	14,000	3,000
Carrying value of closed portfolios used in hedging relations	28,000	11,000
Debt securities
Derivatives
Debt securities AFS, carrying amount of hedged asset	111,886	98,837
Debt securities AFS, cumulative fair value hedging adjustment increasing (decreasing) the carrying amount, active	(925)	(2,976)
Debt securities AFS, cumulative fair value hedging adjustment increasing (decreasing) the carrying amount, de-designated	(282)	$ (333)
Consumer
Derivatives
Debt securities AFS, carrying amount of hedged asset	4,968
Debt securities AFS, cumulative fair value hedging adjustment increasing (decreasing) the carrying amount, active	93
Debt securities AFS, cumulative fair value hedging adjustment increasing (decreasing) the carrying amount, de-designated	(3)
Amount of designated hedged items	3,600
Carrying value of closed portfolios used in hedging relations	$ 5,000