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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 22,673	$ 22,201
Other comprehensive income before reclassifications	(328)	496
Amounts reclassified to the Consolidated Statements of Operations	(23)	0
Total other comprehensive (loss) income, net of income taxes	(351)	496
Ending balance	22,653	21,950
Total AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(60)	(411)
Total other comprehensive (loss) income, net of income taxes	(351)	496
Ending balance	(411)	85
Net Unrealized (Losses) Gains on Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(11)	3
Other comprehensive income before reclassifications	(21)	96
Amounts reclassified to the Consolidated Statements of Operations	(25)	(3)
Total other comprehensive (loss) income, net of income taxes	(46)	93
Ending balance	(57)	96
Net Unrealized (Losses) Gains on Debt Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	380	1
Other comprehensive income before reclassifications	(307)	400
Amounts reclassified to the Consolidated Statements of Operations	(2)	0
Total other comprehensive (loss) income, net of income taxes	(309)	400
Ending balance	71	401
Employee Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(429)	(415)
Other comprehensive income before reclassifications	0	0
Amounts reclassified to the Consolidated Statements of Operations	4	3
Total other comprehensive (loss) income, net of income taxes	4	3
Ending balance	$ (425)	(412)
Cumulative Effect, Period Of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		$ (331)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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