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RETIREMENT BENEFIT PLANS - Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension benefits | US        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 0 2 1 3
Expected return on plan assets (2) (2) (5) (5)
Amortization of unrecognized prior service credit 0 0 0 0
Amortization of unrecognized loss 0 0 1 1
Net periodic benefit (income) cost (2) 0 (3) (1)
Pension benefits | Non-US        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 7 5 13 10
Interest cost 7 3 15 5
Expected return on plan assets (21) (6) (42) (12)
Amortization of unrecognized prior service credit 0 0 0 0
Amortization of unrecognized loss 4 2 7 5
Net periodic benefit (income) cost (3) 4 (7) 8
Other postretirement employee benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 0 0 0 1
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service credit (1) 0 (1) (1)
Amortization of unrecognized loss 1 0 1 0
Net periodic benefit (income) cost $ 0 $ 0 $ 0 $ 0