BASIS OF PRESENTATION (Details) - USD ($) $ in Millions		3 Months Ended		36 Months Ended
	Jan. 01, 2020	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2025	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 6,011			$ 6,498
Income tax expense		11	$ 127
Allowance for credit loss	$ 1,747	$ 2,210			$ 1,296
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Basis point change in CET1	(0.22%)
Scenario, Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Basis point change in CET1				(0.06%)
Capital impact phase in percentage				25.00%
Cumulative Effect, Period Of Adoption, Adjustment | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ (337)
Income tax expense	(114)
Allowance for credit loss	$ 451