OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Components of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Before Tax
Total other comprehensive income (loss)	$ 177	$ 950	$ 1,118	$ 660
Tax Effect
Total other comprehensive income (loss)	(10)	(134)	(134)	(70)
Net of Tax
Total other comprehensive income (loss), net of tax	167	816	984	590
URA(D) of securities
Before Tax
OCI before reclassification	155	824	847	531
Reclassification from AOCI	47	33	62	49
Total other comprehensive income (loss)	202	857	909	581
Tax Effect
OCI before reclassification	(26)	(120)	(133)	(54)
Reclassification from AOCI	(10)	(3)	(14)	(6)
Net of Tax
OCI before reclassifications	129	704	714	477
Reclassification from AOCI	37	30	48	44
Total other comprehensive income (loss), net of tax	165	734	762	521
Foreign currency translation and other adjustments
Before Tax
OCI before reclassification	(25)	93	219	49
Tax Effect
OCI before reclassification	26	(11)	11	(4)
Net of Tax
OCI before reclassifications	1	83	230	45
Total other comprehensive income (loss), net of tax	1	83	230	45
Reclassification of benefit plan liability amortization included in net income (loss)
Before Tax
Reclassification from AOCI	0	(1)	(10)	31
Tax Effect
Reclassification from AOCI	0	0	2	(6)
Net of Tax
Reclassification from AOCI	0	0	(8)	24
Total other comprehensive income (loss), net of tax	$ 0	$ 0	$ (8)	$ 24

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