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RETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Pension plan | United States pension benefit expense    
Retirement benefits plans expense    
Service cost $ 25 $ 24
Interest cost 30 31
Expected return on plan assets (63) (61)
Amortization 24 20
Total 16 14
Settlements and other 14 17
Total expense 30 31
Pension plan | Non-United States pension benefit expense    
Retirement benefits plans expense    
Service cost 16 17
Interest cost 14 13
Expected return on plan assets (27) (23)
Amortization 10 13
Total 13 20
Settlements and other 0 0
Total expense 13 20
Other postretirement benefits expense    
Retirement benefits plans expense    
Service cost 1 1
Interest cost 3 3
Expected return on plan assets (1) (1)
Amortization (3) (3)
Total 0 0
Settlements and other 0 0
Total expense $ 0 $ 0