SECURITIES - Schedule of Investments in Continuous Loss Positions (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value
Less than 12 Months	$ 17,574	$ 14,990
12 Months or Longer	5,634	1,236
Total	23,208	16,226
Gross Unrealized Losses
Less than 12 Months	(1,363)	(322)
12 Months or Longer	(1,099)	(55)
Total	(2,462)	(377)
U.S. Treasury and other
Fair Value
Less than 12 Months	3,356
12 Months or Longer	0
Total	3,356
Gross Unrealized Losses
Less than 12 Months	(193)
12 Months or Longer	0
Total	(193)
Total mortgage-backed securities
Fair Value
Less than 12 Months	13,433	14,254
12 Months or Longer	5,213	1,236
Total	18,646	15,490
Gross Unrealized Losses
Less than 12 Months	(1,144)	(321)
12 Months or Longer	(1,083)	(55)
Total	(2,227)	(376)
Federal agencies and U.S. government sponsored entities
Fair Value
Less than 12 Months	13,353	14,131
12 Months or Longer	5,042	1,236
Total	18,395	15,367
Gross Unrealized Losses
Less than 12 Months	(1,136)	(320)
12 Months or Longer	(1,062)	(55)
Total	(2,198)	(375)
Other/non-agency
Fair Value
Less than 12 Months	80	123
12 Months or Longer	171	0
Total	251	123
Gross Unrealized Losses
Less than 12 Months	(8)	(1)
12 Months or Longer	(21)	0
Total	(29)	(1)
Collateralized loan obligations
Fair Value
Less than 12 Months	785	736
12 Months or Longer	421	0
Total	1,206	736
Gross Unrealized Losses
Less than 12 Months	(26)	(1)
12 Months or Longer	(16)	0
Total	$ (42)	$ (1)