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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 |  |

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