OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Components of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Before Tax
Total other comprehensive income (loss)	$ (61)	$ (196)	$ (290)	$ 116
Tax Effect
Total other comprehensive income (loss)	25	29	63	(3)
Net of Tax
Total other comprehensive income (loss), net of tax	(36)	(168)	(227)	113
URA(D) on securities
Before Tax
OCI before reclassification, before tax	(101)	(199)	(293)	75
Reclassification from AOCI, before tax	11	4	17	10
Tax Effect
OCI before reclassification, tax effect	32	30	66	2
Reclassification from AOCI, tax	(2)	(2)	(3)	(4)
Net of Tax
OCI before reclassifications, net of tax	(70)	(169)	(227)	77
Reclassification from AOCI, net of tax	9	2	14	5
Total other comprehensive income (loss), net of tax	(60)	(167)	(213)	82
Foreign currency translation adjustments
Before Tax
OCI before reclassification, before tax	(2)	(2)	(45)	31
Tax Effect
OCI before reclassification, tax effect	2	1	7	(1)
Net of Tax
OCI before reclassifications, net of tax	0	(1)	(38)	30
Total other comprehensive income (loss), net of tax	0	(1)	(38)	30
Benefit plan net gain (loss)
Before Tax
Reclassification from AOCI, before tax	31	1	31	1
Tax Effect
Reclassification from AOCI, tax	(6)	0	(7)	0
Net of Tax
Reclassification from AOCI, net of tax	24	0	25	1
Total other comprehensive income (loss), net of tax	$ 24	$ 0	$ 25	$ 1

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