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COMMITMENTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Purchase obligations and lease commitments [Abstract]      
Purchase Obligation $ 1,400    
Purchase Obligation Description over a period of approximately 30 years for materials, supplies, and energy incident to the ordinary conduct of business.    
Operating Lease Commitments Cancelable Noncancelable $ 273    
Lessee Leasing Arrangements, Operating Leases, Term of Contract 40 years    
Percentage of Operating Lease Commitments related to real property (in hundredths) 50.00%    
Percentage of Operating Lease Commitments related to railcars (in hundredths) 45.00%    
Percentage of Operating Lease Commitments related to machinery and equipment (in hundredths) 5.00%    
Rental expense, net of sublease income $ 91 $ 80 $ 73
Payment Due [Abstract]      
2016 904    
2017 1,497    
2018 930    
2019 870    
2020 1,145    
2021 and beyond 6,511    
Total 11,857    
Guarantees [Abstract]      
Operating Lease Residual Value Guarantees $ 120    
Guarantor Obligations, Term 30    
Maximum potential future payment, other guarantees $ 35    
Debt Securities [Member]      
Payment Due [Abstract]      
2016 0    
2017 999    
2018 167    
2019 250    
2020 799    
2021 and beyond 3,840    
Total 6,055    
Credit Facilities and Other [Member]      
Payment Due [Abstract]      
2016 431    
2017 1    
2018 326    
2019 226    
2020 0    
2021 and beyond 0    
Total 984    
Interest Payable [Member]      
Payment Due [Abstract]      
2016 265    
2017 283    
2018 238    
2019 218    
2020 190    
2021 and beyond 1,926    
Total 3,120    
Purchase Obligations [Member]      
Payment Due [Abstract]      
2016 145    
2017 164    
2018 161    
2019 148    
2020 134    
2021 and beyond 673    
Total 1,425    
Operating Leases [Member]      
Payment Due [Abstract]      
2016 63    
2017 50    
2018 38    
2019 28    
2020 22    
2021 and beyond 72    
Total $ 273