RETIREMENT BENEFIT PLANS - Net periodic benefit cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other postretirement employee benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 0	$ 0	$ 0
Interest cost	2	3	3
Expected return on plan assets	0	0	0
Settlements, curtailments and other	0	0	0
Amortization of unrecognized prior service (credit) cost	(4)	(4)	(4)
Amortization of unrecognized loss	1	1	1
Net periodic cost (income)	(1)	0	0
United States | Pension benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0	0	0
Interest cost	5	8	9
Expected return on plan assets	(10)	(11)	(14)
Settlements, curtailments and other	0	27	0
Amortization of unrecognized prior service (credit) cost	0	(1)	(1)
Amortization of unrecognized loss	3	4	4
Net periodic cost (income)	(2)	27	(2)
Non-U.S. | Pension benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	21	18	18
Interest cost	16	12	12
Expected return on plan assets	(36)	(22)	(27)
Settlements, curtailments and other	5	1	0
Amortization of unrecognized prior service (credit) cost	0	0	0
Amortization of unrecognized loss	11	9	7
Net periodic cost (income)	$ 17	$ 18	$ 10