OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Components of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Before Tax
Total other comprehensive income (loss)	$ (1,093)	$ 177	$ (1,575)	$ 1,118
Tax Effect
Total other comprehensive income (loss)	211	(10)	313	(134)
Net of Tax
Total other comprehensive income (loss), net of tax	(882)	167	(1,262)	984
URA(D) of securities
Before Tax
OCI before reclassification	(1,164)	155	(1,603)	847
Reclassification from AOCI	60	47	76	62
Total other comprehensive income (loss)	(1,104)	202	(1,527)	909
Tax Effect
OCI before reclassification	229	(26)	307	(133)
Reclassification from AOCI	(16)	(10)	(19)	(14)
Net of Tax
OCI before reclassifications	(935)	129	(1,295)	714
Reclassification from AOCI	44	37	57	48
Total other comprehensive income (loss), net of tax	(891)	165	(1,238)	762
Foreign currency translation and other adjustments
Before Tax
OCI before reclassification	11	(25)	(46)	219
Tax Effect
OCI before reclassification	(2)	26	23	11
Net of Tax
OCI before reclassifications	9	1	(23)	230
Total other comprehensive income (loss), net of tax	9	1	(23)	230
Reclassification of benefit plan liability amortization included in net income (loss)
Before Tax
OCI before reclassification	0	0	0	0
Reclassification from AOCI	0	0	(1)	(10)
Tax Effect
OCI before reclassification	0	0	0	0
Reclassification from AOCI	0	0	0	2
Net of Tax
OCI before reclassifications	0	0	0	0
Reclassification from AOCI	0	0	(1)	(8)
Total other comprehensive income (loss), net of tax	$ 0	$ 0	$ (1)	$ (8)

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