OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Components of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Before Tax
Total other comprehensive income (loss)	$ (499)	$ 414
Tax Effect
Total other comprehensive income (loss)	88	(62)
Net of Tax
Total other comprehensive income (loss), net of tax	(410)	352
URA(D) of securities
Before Tax
OCI before reclassification	(456)	342
Reclassification from AOCI	3	5
Total other comprehensive income (loss)	(453)	347
Tax Effect
OCI before reclassification	81	(58)
Reclassification from AOCI	(2)	(1)
Net of Tax
OCI before reclassifications	(375)	284
Reclassification from AOCI	1	4
Total other comprehensive income (loss), net of tax	(374)	289
Foreign currency translation and other adjustments
Before Tax
OCI before reclassification	(45)	67
Tax Effect
OCI before reclassification	10	(3)
Net of Tax
OCI before reclassifications	(35)	64
Total other comprehensive income (loss), net of tax	(35)	64
Reclassification of benefit plan liability amortization included in net income (loss)
Before Tax
Reclassification from AOCI	0	0
Tax Effect
Reclassification from AOCI	0	0
Net of Tax
Reclassification from AOCI	0	0
Total other comprehensive income (loss), net of tax	$ 0	$ 0

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