OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Components of Comprehensive Income (Loss) in the Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Before Tax
Total other comprehensive income (loss)	$ (23)	$ 162	$ (273)	$ 374
Tax Effect
Total other comprehensive income (loss)	5	(34)	56	(79)
Net of Tax
Total other comprehensive income (loss), net of tax	(18)	128	(217)	296
URA(D) of securities
Before Tax
OCI before reclassification	(21)	109	(257)	305
Reclassification of net realized losses (gains) included in net income (loss)	10	2	10	5
Tax Effect
OCI before reclassification	4	(23)	53	(64)
Reclassification of net realized losses (gains) included in net income (loss)	(2)	0	(2)	(1)
Net of Tax
OCI before reclassifications	(17)	86	(204)	241
Reclassification of net realized losses (gains) included in net income (loss)	8	2	8	4
Total other comprehensive income (loss), net of tax	(9)	88	(197)	245
Foreign currency translation adjustments
Before Tax
OCI before reclassification	(11)	61	(25)	75
Tax Effect
OCI before reclassification	2	(13)	5	(16)
Net of Tax
OCI before reclassifications	(9)	48	(19)	59
Total other comprehensive income (loss), net of tax	(9)	48	(19)	59
Benefit plan net gain (loss)
Before Tax
OCI before reclassification	0	18	0	18
Reclassification of net realized losses (gains) included in net income (loss)	0	(28)	(1)	(28)
Tax Effect
OCI before reclassification	0	(4)	0	(4)
Reclassification of net realized losses (gains) included in net income (loss)	0	6	0	6
Net of Tax
OCI before reclassifications	0	14	0	14
Reclassification of net realized losses (gains) included in net income (loss)	0	(22)	(1)	(22)
Total other comprehensive income (loss), net of tax	$ 0	$ (8)	$ (1)	$ (8)

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