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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions		Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	[1]	$ 34,658	$ 32,765
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	[1]	8,293	8,599
Gross Unrealized Gains		0	1
Gross Unrealized Gains		(914)	(1,060)
Fair Value		7,379	7,540
Total equity securities, at cost, Amortized Cost		772	710
Equity securities, at cost, fair value		772	710
Equity Securities, Amortized Cost		257	220
Equity Securities, Fair Value		257	220
Portfolio level basis adjustments excluded from amortized cost		29	(75)
Total debt securities available for sale, at fair value
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost		36,335	34,986
Gross Unrealized Gains		95	36
Gross Unrealized Losses		(1,772)	(2,257)
Fair Value		34,658	32,765
U.S. Treasury and other
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost		4,462	3,631
Gross Unrealized Gains		20	3
Gross Unrealized Losses		(81)	(109)
Fair Value		4,401	3,525
State and political subdivisions
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost		1	1
Gross Unrealized Gains		0	0
Gross Unrealized Losses		0	0
Fair Value		1	1
Total mortgage-backed securities
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost		31,748	31,170
Gross Unrealized Gains		75	33
Gross Unrealized Losses		(1,691)	(2,148)
Fair Value		30,132	29,055
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost		7,919	8,187
Gross Unrealized Gains		0	0
Gross Unrealized Gains		(911)	(1,051)
Fair Value		7,008	7,136
Federal agencies and U.S. government sponsored entities
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost		31,477	30,897
Gross Unrealized Gains		75	33
Gross Unrealized Losses		(1,683)	(2,135)
Fair Value		29,869	28,795
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost		7,919	8,187
Gross Unrealized Gains		0	0
Gross Unrealized Gains		(911)	(1,051)
Fair Value		7,008	7,136
Other/non-agency
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost		271	273
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(8)	(13)
Fair Value		263	260
Collateralized loan obligations
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost		124	184
Gross Unrealized Gains		0	0
Gross Unrealized Losses		0	0
Fair Value		124	184
Asset-backed securities
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost		374	412
Gross Unrealized Gains		0	1
Gross Unrealized Gains		(3)	(9)
Fair Value		$ 371	$ 404
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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