BASIS OF PRESENTATION Operating Leases (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2023	Dec. 31, 2020	Sep. 30, 2019	Jan. 02, 2019	Jan. 01, 2019
Operating Leased Assets [Line Items]
Cumulative effect of change in accounting standards					$ 17	$ 5
Operating lease right-of-use assets				$ 712
Operating lease liabilities				$ 733
Accounting Standards Update 2016-02
Operating Leased Assets [Line Items]
Operating lease right-of-use assets						734
Operating lease liabilities						749
Retained Earnings
Operating Leased Assets [Line Items]
Cumulative effect of change in accounting standards					$ 12
Retained Earnings | Accounting Standards Update 2016-02
Operating Leased Assets [Line Items]
Cumulative effect of change in accounting standards						$ 12
Scenario, Forecast | Accounting Standards Update 2016-13
Operating Leased Assets [Line Items]
Capital impact phase in percentage	25.00%
Scenario, Forecast | Minimum | Accounting Standards Update 2016-13
Operating Leased Assets [Line Items]
Increase in overall ACL	30.00%
Basis point change in CET1		0.22%	0.05%
Scenario, Forecast | Maximum | Accounting Standards Update 2016-13
Operating Leased Assets [Line Items]
Increase in overall ACL	35.00%
Basis point change in CET1		0.25%	0.06%