SECURITIES - Schedule of Investments in Continuous Loss Positions (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value
Less than 12 Months	$ 9,560	$ 3,044
12 Months or Longer	17,108	20,505
Total	26,668	23,549
Gross Unrealized Losses
Less than 12 Months	(265)	(24)
12 Months or Longer	(1,992)	(1,999)
Total	(2,257)	(2,023)
U.S. Treasury and other
Fair Value
Less than 12 Months	0	49
12 Months or Longer	2,544	3,245
Total	2,544	3,294
Gross Unrealized Losses
Less than 12 Months	0	0
12 Months or Longer	(109)	(139)
Total	(109)	(139)
Total mortgage-backed securities
Fair Value
Less than 12 Months	9,560	2,939
12 Months or Longer	14,564	16,653
Total	24,124	19,592
Gross Unrealized Losses
Less than 12 Months	(265)	(24)
12 Months or Longer	(1,883)	(1,857)
Total	(2,148)	(1,881)
Federal agencies and U.S. government sponsored entities
Fair Value
Less than 12 Months	9,560	2,939
12 Months or Longer	14,304	16,398
Total	23,864	19,337
Gross Unrealized Losses
Less than 12 Months	(265)	(24)
12 Months or Longer	(1,870)	(1,833)
Total	(2,135)	(1,857)
Other/non-agency
Fair Value
Less than 12 Months	0	0
12 Months or Longer	260	255
Total	260	255
Gross Unrealized Losses
Less than 12 Months	0	0
12 Months or Longer	(13)	(24)
Total	(13)	(24)
Collateralized loan obligations
Fair Value
Less than 12 Months	0	56
12 Months or Longer	0	607
Total	0	663
Gross Unrealized Losses
Less than 12 Months	0	0
12 Months or Longer	0	(3)
Total	$ 0	$ (3)