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INVESTMENT SECURITIES - Schedule of Unrealized Losses (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Investment securities available for sale
Investment securities available for sale, less than 12 months, fair value	$ 1,722	$ 12,460
Investment securities available for sale, less than 12 months, unrealized losses	(3)	(81)
Investment securities available for sale, 12 months or more, fair value	4,587	6,413
Investment securities available for sale, 12 months or more, unrealized losses	(500)	(762)
Investment securities available for sale, fair value	6,309	18,873
Investment securities available for sale, unrealized losses	(503)	(843)
U.S. Treasury
Investment securities available for sale
Investment securities available for sale, less than 12 months, fair value	859	3,791
Investment securities available for sale, less than 12 months, unrealized losses	(1)	(12)
Investment securities available for sale, 12 months or more, fair value	0	981
Investment securities available for sale, 12 months or more, unrealized losses	0	(15)
Investment securities available for sale, fair value	859	4,772
Investment securities available for sale, unrealized losses	(1)	(27)
Government agency
Investment securities available for sale
Investment securities available for sale, less than 12 months, fair value	0	0
Investment securities available for sale, less than 12 months, unrealized losses	0	0
Investment securities available for sale, 12 months or more, fair value	43	77
Investment securities available for sale, 12 months or more, unrealized losses	(1)	(2)
Investment securities available for sale, fair value	43	77
Investment securities available for sale, unrealized losses	(1)	(2)
Residential mortgage-backed securities
Investment securities available for sale
Investment securities available for sale, less than 12 months, fair value	815	7,470
Investment securities available for sale, less than 12 months, unrealized losses	(2)	(61)
Investment securities available for sale, 12 months or more, fair value	3,292	3,575
Investment securities available for sale, 12 months or more, unrealized losses	(321)	(521)
Investment securities available for sale, fair value	4,107	11,045
Investment securities available for sale, unrealized losses	(323)	(582)
Commercial mortgage-backed securities
Investment securities available for sale
Investment securities available for sale, less than 12 months, fair value	48	1,183
Investment securities available for sale, less than 12 months, unrealized losses	0	(8)
Investment securities available for sale, 12 months or more, fair value	1,129	1,342
Investment securities available for sale, 12 months or more, unrealized losses	(173)	(202)
Investment securities available for sale, fair value	1,177	2,525
Investment securities available for sale, unrealized losses	(173)	(210)
Corporate Bonds
Investment securities available for sale
Investment securities available for sale, less than 12 months, fair value	0	16
Investment securities available for sale, less than 12 months, unrealized losses	0	0
Investment securities available for sale, 12 months or more, fair value	123	438
Investment securities available for sale, 12 months or more, unrealized losses	(5)	(22)
Investment securities available for sale, fair value	123	454
Investment securities available for sale, unrealized losses	$ (5)	$ (22)

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