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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 23,199	$ 22,418	$ 22,673	$ 22,201
Other comprehensive income (loss) before reclassifications	(120)	(44)	(392)	493
Amounts reclassified to the Consolidated Statements of Operations	(7)	(40)	(56)	(72)
Total other comprehensive income (loss), net of income taxes	(127)	(84)	(448)	421
Ending balance	23,423	22,469	23,423	22,469
Total AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(381)	94	(60)	(411)
Total other comprehensive income (loss), net of income taxes	(127)	(84)	(448)	421
Ending balance	(508)	10	(508)	10
Net Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(38)	54	(11)	3
Other comprehensive income (loss) before reclassifications	(11)	0	14	88
Amounts reclassified to the Consolidated Statements of Operations	(25)	(42)	(77)	(79)
Total other comprehensive income (loss), net of income taxes	(36)	(42)	(63)	9
Ending balance	(74)	12	(74)	12
Net Unrealized Gains (Losses) on Debt Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	78	448	380	1
Other comprehensive income (loss) before reclassifications	(109)	(44)	(406)	405
Amounts reclassified to the Consolidated Statements of Operations	(2)	(1)	(7)	(3)
Total other comprehensive income (loss), net of income taxes	(111)	(45)	(413)	402
Ending balance	(33)	403	(33)	403
Employee Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(421)	(408)	(429)	(415)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified to the Consolidated Statements of Operations	20	3	28	10
Total other comprehensive income (loss), net of income taxes	20	3	28	10
Ending balance	$ (401)	$ (405)	$ (401)	(405)
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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