OTHER COMPREHENSIVE INCOME (LOSS) - Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Before Tax
Total other comprehensive income (loss)	$ (53)	$ (524)	$ 109	$ (1,021)
Tax Effect
Total other comprehensive income (loss)	11	110	(23)	214
Net of Tax
Total other comprehensive income (loss), net of tax	(42)	(414)	86	(807)
URA(D) on securities
Before Tax
OCI before reclassification, before tax	(56)	(520)	86	(1,019)
Reclassification from AOCI, before tax	8	8	19	11
Tax Effect
OCI before reclassification, tax effect	12	109	(18)	213
Reclassification from AOCI, tax	(2)	(2)	(4)	(2)
Net of Tax
OCI before reclassifications, net of tax	(44)	(411)	68	(805)
Reclassification from AOCI, net of tax	6	6	15	8
Total other comprehensive income (loss), net of tax	(38)	(405)	83	(797)
Foreign currency translation adjustments
Before Tax
OCI before reclassification, before tax	(5)	(12)	3	(15)
Tax Effect
OCI before reclassification, tax effect	1	3	(1)	3
Net of Tax
OCI before reclassifications, net of tax	(4)	(10)	2	(12)
Total other comprehensive income (loss), net of tax	(4)	(10)	2	(12)
Benefit plan net gain (loss)
Before Tax
Reclassification from AOCI, before tax	1	1	1	2
Tax Effect
Reclassification from AOCI, tax	0	0	0	0
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