SECURITIES - Schedule of Investments in Continuous Loss Positions (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Fair Value
Less than 12 Months	$ 4,760	$ 9,560
12 Months or Longer	16,106	17,108
Total	20,866	26,668
Gross Unrealized Losses
Less than 12 Months	(171)	(265)
12 Months or Longer	(1,380)	(1,992)
Total	(1,551)	(2,257)
Mortgage-backed securities
Fair Value
Less than 12 Months	4,760	9,560
12 Months or Longer	13,493	14,564
Total	18,253	24,124
Gross Unrealized Losses
Less than 12 Months	(171)	(265)
12 Months or Longer	(1,308)	(1,883)
Total	(1,479)	(2,148)
U.S. Treasury and other
Fair Value
Less than 12 Months	0	0
12 Months or Longer	2,613	2,544
Total	2,613	2,544
Gross Unrealized Losses
Less than 12 Months	0	0
12 Months or Longer	(72)	(109)
Total	(72)	(109)
Federal agencies and U.S. government sponsored entities
Fair Value
Less than 12 Months	4,760	9,560
12 Months or Longer	13,230	14,304
Total	17,990	23,864
Gross Unrealized Losses
Less than 12 Months	(171)	(265)
12 Months or Longer	(1,303)	(1,870)
Total	(1,474)	(2,135)
Other/non-agency
Fair Value
Less than 12 Months	0	0
12 Months or Longer	263	260
Total	263	260
Gross Unrealized Losses
Less than 12 Months	0	0
12 Months or Longer	(5)	(13)
Total	$ (5)	$ (13)