SECURITIES - Schedule of Investments in Continuous Loss Positions (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Fair Value
Less than 12 Months	$ 22,746	$ 14,990
12 Months or Longer	1,498	1,236
Total	24,244	16,226
Gross Unrealized Losses
Less than 12 Months	(1,330)	(322)
12 Months or Longer	(269)	(55)
Total	(1,599)	(377)
U.S. Treasury and other
Fair Value
Less than 12 Months	3,236
12 Months or Longer	0
Total	3,236
Gross Unrealized Losses
Less than 12 Months	(48)
12 Months or Longer	0
Total	(48)
Federal agencies and U.S. government sponsored entities
Fair Value
Less than 12 Months	18,048	14,131
12 Months or Longer	1,498	1,236
Total	19,546	15,367
Gross Unrealized Losses
Less than 12 Months	(1,214)	(320)
12 Months or Longer	(269)	(55)
Total	(1,483)	(375)
Other/non-agency
Fair Value
Less than 12 Months	261	123
12 Months or Longer	0	0
Total	261	123
Gross Unrealized Losses
Less than 12 Months	(20)	(1)
12 Months or Longer	0	0
Total	(20)	(1)
Mortgage-backed securities
Fair Value
Less than 12 Months	18,309	14,254
12 Months or Longer	1,498	1,236
Total	19,807	15,490
Gross Unrealized Losses
Less than 12 Months	(1,234)	(321)
12 Months or Longer	(269)	(55)
Total	(1,503)	(376)
Collateralized loan obligations
Fair Value
Less than 12 Months	1,201	736
12 Months or Longer	0	0
Total	1,201	736
Gross Unrealized Losses
Less than 12 Months	(48)	(1)
12 Months or Longer	0	0
Total	$ (48)	$ (1)