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BASIS OF PRESENTATION - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ (6,445)	$ (6,498)
Income tax expense		(241)	(460)	$ (462)
Allowance for credit losses		$ 2,443	$ 1,252
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 337
Income tax expense	114
Allowance for credit losses	$ 451

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