RETIREMENT BENEFITS PLANS - Fair Value of Other Postretirement Benefits Plan Assets (Details) - Other postretirement benefits plans - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value of Other Postretirement Benefits Plan Assets [Line Items]
Cash equivalents	$ 3	$ 3
Common collective and other trusts measured at net asset value	13	16
Total other postretirement benefits plan assets	16	19
Quoted prices in active markets for identical assets (Level 1)
Fair Value of Other Postretirement Benefits Plan Assets [Line Items]
Cash equivalents	3	3
Total other postretirement benefits plan assets	3	3
Other observable inputs (Level 2)
Fair Value of Other Postretirement Benefits Plan Assets [Line Items]
Cash equivalents	0	0
Total other postretirement benefits plan assets	0	0
Unobservable inputs (Level 3)
Fair Value of Other Postretirement Benefits Plan Assets [Line Items]
Cash equivalents	0	0
Total other postretirement benefits plan assets	$ 0	$ 0