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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Pension Plans [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost $ 10 $ 9
Interest cost 32 32
Expected return on plan assets (55) (55)
Amortization of net (gain) loss 24 21
Net periodic benefit cost 11 7
Other Postretirement Benefits [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Interest cost 2 2
Amortization of net (gain) loss (2) (1)
Net periodic benefit cost $ 0 $ 1