INVESTMENT AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Available-for-sale securities:
Amortized Cost	$ 38,169	$ 28,510
Unrealized Gross Gains	5	66
Unrealized Gross Losses	(3,551)	(2,444)
Fair Value	34,623	26,132
Held-to-maturity securities:
Amortized Cost	14,733	15,258
Unrealized Gross Gains	0	25
Unrealized Gross Losses	(2,267)	(1,647)
Fair Value	12,466	13,636
Other securities, at cost:
Amortized Cost	1,433	994
Unrealized Gross Gains	2	0
Unrealized Gross Losses	(2)	0
Fair Value	1,433	994
Accrued interest receivable on AFS securities	156	106
Accrued interest receivable on HTM securities	40	44
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items	515	177
U.S. Treasury
Available-for-sale securities:
Amortized Cost	8,554	4,590
Unrealized Gross Gains	0	45
Unrealized Gross Losses	(100)	0
Fair Value	8,454	4,635
Held-to-maturity securities:
Amortized Cost	2,369	2,349
Unrealized Gross Gains	0	19
Unrealized Gross Losses	(29)	0
Fair Value	2,340	2,368
US Treasury and Government
Available-for-sale securities:
Amortized Cost	33,049	23,758
Unrealized Gross Gains	4	57
Unrealized Gross Losses	(3,320)	(2,333)
Fair Value	29,733	21,482
Held-to-maturity securities:
Amortized Cost	14,732	15,257
Unrealized Gross Gains	0	25
Unrealized Gross Losses	(2,267)	(1,647)
Fair Value	12,465	13,635
Residential MBS
Available-for-sale securities:
Amortized Cost	14,004	11,031
Unrealized Gross Gains	3	3
Unrealized Gross Losses	(1,891)	(1,365)
Fair Value	12,116	9,669
Held-to-maturity securities:
Amortized Cost	7,497	7,718
Unrealized Gross Gains	0	1
Unrealized Gross Losses	(1,318)	(941)
Fair Value	6,179	6,778
Residential CMO
Available-for-sale securities:
Amortized Cost	6,710	5,496
Unrealized Gross Gains	0	9
Unrealized Gross Losses	(521)	(308)
Fair Value	6,189	5,197
Held-to-maturity securities:
Amortized Cost	3,629	3,865
Unrealized Gross Gains	0	5
Unrealized Gross Losses	(684)	(520)
Fair Value	2,945	3,350
Commercial MBS
Available-for-sale securities:
Amortized Cost	3,330	2,488
Unrealized Gross Gains	0	0
Unrealized Gross Losses	(805)	(657)
Fair Value	2,525	1,831
Held-to-maturity securities:
Amortized Cost	1,204	1,278
Unrealized Gross Gains	0	0
Unrealized Gross Losses	(233)	(184)
Fair Value	971	1,094
Other agencies
Available-for-sale securities:
Amortized Cost	451	153
Unrealized Gross Gains	1	0
Unrealized Gross Losses	(3)	(3)
Fair Value	449	150
Held-to-maturity securities:
Amortized Cost	33	47
Unrealized Gross Gains	0	0
Unrealized Gross Losses	(3)	(2)
Fair Value	30	45
Municipal securities
Available-for-sale securities:
Amortized Cost	4,659	4,215
Unrealized Gross Gains	1	9
Unrealized Gross Losses	(193)	(81)
Fair Value	4,467	4,143
Held-to-maturity securities:
Amortized Cost	1	1
Unrealized Gross Gains	0	0
Unrealized Gross Losses	0	0
Fair Value	1	1
Corporate debt
Available-for-sale securities:
Amortized Cost	185	193
Unrealized Gross Gains	0	0
Unrealized Gross Losses	(21)	(15)
Fair Value	164	178
Asset-backed securities
Available-for-sale securities:
Amortized Cost	168	229
Unrealized Gross Gains	0	0
Unrealized Gross Losses	(7)	(8)
Fair Value	161	221
Private-label CMO
Available-for-sale securities:
Amortized Cost	98	105
Unrealized Gross Gains	0	0
Unrealized Gross Losses	(10)	(7)
Fair Value	88	98
Other securities/sovereign debt
Available-for-sale securities:
Amortized Cost	10	10
Unrealized Gross Gains	0	0
Unrealized Gross Losses	0	0
Fair Value	10	10
Non-marketable equity securities: \| FRB stock
Other securities, at cost:
Amortized Cost	884	616
Unrealized Gross Gains	0	0
Unrealized Gross Losses	0	0
Fair Value	884	616
Non-marketable equity securities: \| FHLB stock
Other securities, at cost:
Amortized Cost	426	288
Unrealized Gross Gains	0	0
Unrealized Gross Losses	0	0
Fair Value	426	288
Other non-marketable equity securities
Other securities, at cost:
Amortized Cost	61	48
Unrealized Gross Gains	0	0
Unrealized Gross Losses	0	0
Fair Value	61	48
Mutual funds
Other securities, at cost:
Amortized Cost	28	30
Unrealized Gross Gains	0	0
Unrealized Gross Losses	0	0
Fair Value	28	30
Equity securities
Other securities, at cost:
Amortized Cost	34	12
Unrealized Gross Gains	2	0
Unrealized Gross Losses	(2)	0
Fair Value	$ 34	$ 12

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