BUSINESS SEGMENTS - Schedule of Business Operating Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net interest income	$ 5,853	$ 5,633	$ 6,241
Noninterest income	2,394	2,176	1,983
Total revenue	8,247	7,809	8,224
Direct expenses	5,311	5,234	5,507
Indirect expenses	0	0	0
Total noninterest expense	5,311	5,234	5,507
Profit (loss) before provision for credit losses	2,936	2,575	2,717
Provision (benefit) for credit losses	608	687	687
Income before income tax expense	2,328	1,888	2,030
Income tax expense	497	379	422
NET INCOME	1,831	1,509	1,608
Total average assets	218,597	219,024	222,221
Operating Segments
Segment Reporting Information [Line Items]
Noninterest income	2,394	2,176	1,983
Operating Segments | Consumer Banking
Segment Reporting Information [Line Items]
Net interest income	4,972	4,564	4,187
Noninterest income	1,252	1,131	1,067
Total revenue	6,224	5,695	5,254
Direct expenses	2,741	2,609	2,519
Indirect expenses	1,139	1,068	1,023
Total noninterest expense	3,880	3,677	3,542
Profit (loss) before provision for credit losses	2,344	2,018	1,712
Provision (benefit) for credit losses	328	331	280
Income before income tax expense	2,016	1,687	1,432
Income tax expense	510	434	373
NET INCOME	1,506	1,253	1,059
Total average assets	79,925	75,064	72,721
Depreciation and amortization	122	121	112
Operating Segments | Commercial Banking
Segment Reporting Information [Line Items]
Net interest income	1,778	1,950	2,292
Noninterest income	995	908	784
Total revenue	2,773	2,858	3,076
Direct expenses	911	842	884
Indirect expenses	423	399	411
Total noninterest expense	1,334	1,241	1,295
Profit (loss) before provision for credit losses	1,439	1,617	1,781
Provision (benefit) for credit losses	309	353	250
Income before income tax expense	1,130	1,264	1,531
Income tax expense	265	291	378
NET INCOME	865	973	1,153
Total average assets	66,137	68,478	76,028
Depreciation and amortization	20	26	30
Other
Segment Reporting Information [Line Items]
Net interest income	(897)	(881)	(238)
Noninterest income	147	137	132
Total revenue	(750)	(744)	(106)
Direct expenses	1,659	1,783	2,104
Indirect expenses	(1,562)	(1,467)	(1,434)
Total noninterest expense	97	316	670
Profit (loss) before provision for credit losses	(847)	(1,060)	(776)
Provision (benefit) for credit losses	(29)	3	157
Income before income tax expense	(818)	(1,063)	(933)
Income tax expense	(278)	(346)	(329)
NET INCOME	(540)	(717)	(604)
Total average assets	72,535	75,482	73,472
Depreciation and amortization	$ 305	$ 304	$ 285