OTHER COMPREHENSIVE INCOME (LOSS) - Components of Comprehensive Income (Loss) in the Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Before Tax
Total other comprehensive income (loss)	$ (313)	$ (832)	$ (197)	$ (2,655)
Tax Effect
Total other comprehensive income (loss)	25	61	22	295
Net of Tax
Total other comprehensive income (loss), net of tax	(288)	(771)	(175)	(2,360)
URA(D) on securities
Before Tax
OCI before reclassification, before tax	(281)	(776)	(206)	(2,557)
Reclassification from AOCI, before tax	17	51	26	73
Tax Effect
OCI before reclassification, tax effect	24	64	26	297
Reclassification from AOCI, tax	(2)	(10)	(6)	(12)
Net of Tax
OCI before reclassifications, net of tax	(257)	(712)	(180)	(2,260)
Reclassification from AOCI, net of tax	15	41	21	61
Total other comprehensive income (loss), net of tax	(242)	(671)	(159)	(2,199)
Foreign currency translation adjustments
Before Tax
OCI before reclassification, before tax	(50)	(109)	(19)	(174)
Tax Effect
OCI before reclassification, tax effect	3	8	2	11
Net of Tax
OCI before reclassifications, net of tax	(47)	(101)	(17)	(163)
Total other comprehensive income (loss), net of tax	(47)	(101)	(17)	(163)
Benefit plan net gain (loss)
Before Tax
Reclassification from AOCI, before tax	1	2	2	3
Tax Effect
Reclassification from AOCI, tax	0	(1)	0	(1)
Net of Tax
Reclassification from AOCI, net of tax	0	1	1	2
Total other comprehensive income (loss), net of tax	$ 0	$ 1	$ 1	$ 2

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