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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |
Other current assets | $ 110 | $ 161
Other assets | 1,956 | 1,987
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | 76 | 75
Derivatives: |  |
Derivative Asset | 132 | 14
Derivatives: [Abstract] |  |
Derivative Liability | 44 | 86
Level 1 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 27 | 24
Trust Assets Fair Value Disclosure | 12 | 7
Derivatives: |  |
Derivative Asset | 8 | 1
Contingent receivable | 0 |
Total assets | 47 | 32
Derivatives: [Abstract] |  |
Derivative Liability | 2 | 7
Discontinued Operation, Contingent Payable | 0 |
Long-term debt, including current portion | 0 | 0
Total liabilities | 2 | 7
Level 2 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 0 | 0
Trust Assets Fair Value Disclosure | 118 | 112
Derivatives: |  |
Derivative Asset | 184 | 19
Contingent receivable | 0 |
Total assets | 302 | 131
Derivatives: [Abstract] |  |
Derivative Liability | 56 | 85
Discontinued Operation, Contingent Payable | 23 |
Long-term debt, including current portion | 15,196 | 13,987
Total liabilities | 15,275 | 14,072
Level 3 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 0 | 0
Trust Assets Fair Value Disclosure | 0 | 0
Derivatives: |  |
Derivative Asset | 0 | 0
Contingent receivable | 135 |
Total assets | 135 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 0
Discontinued Operation, Contingent Payable | 0 |
Long-term debt, including current portion | 0 | 0
Total liabilities | 0 | 0
Carrying Amount, Fair Value Disclosure [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 50 | 47
Trust Assets Fair Value Disclosure | 183 | 171
Derivatives: |  |
Derivative Asset | 192 | 20
Contingent receivable | 150 |
Derivatives: [Abstract] |  |
Derivative Liability | 58 | 92
Discontinued Operation, Contingent Payable | 23 |
Long-term debt, including current portion | 16,027 | 20,428
Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 50 | 47
Trust Assets Fair Value Disclosure | 183 | 171
Derivatives: |  |
Derivative Asset | 192 | 20
Contingent receivable | 135 |
Total assets | 560 | 238
Derivatives: [Abstract] |  |
Derivative Liability | 58 | 92
Discontinued Operation, Contingent Payable | 23 |
Long-term debt, including current portion | 15,196 | 13,987
Total liabilities | 15,277 | 14,079
Embedded Derivative Financial Instruments [Member] | Level 1 |  |
Derivatives: [Abstract] |  |
Derivative Liability |  | 0
Embedded Derivative Financial Instruments [Member] | Level 2 |  |
Derivatives: [Abstract] |  |
Derivative Liability |  | 81
Embedded Derivative Financial Instruments [Member] | Level 3 |  |
Derivatives: [Abstract] |  |
Derivative Liability |  | 0
Embedded Derivative Financial Instruments [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Derivatives: [Abstract] |  |
Derivative Liability |  | 81
Embedded Derivative Financial Instruments [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: [Abstract] |  |
Derivative Liability |  | 81
Embedded Derivative Financial Instruments [Member] |  |
Derivatives: |  |
Derivative Asset | 125 | 14
Derivatives: [Abstract] |  |
Derivative Liability | 44 | 76
Embedded Derivative Financial Instruments [Member] | Level 1 |  |
Derivatives: |  |
Derivative Asset | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 0 |
Embedded Derivative Financial Instruments [Member] | Level 2 |  |
Derivatives: |  |
Derivative Asset | 137 | 19
Derivatives: [Abstract] |  |
Derivative Liability | 56 |
Embedded Derivative Financial Instruments [Member] | Level 3 |  |
Derivatives: |  |
Derivative Asset | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 0 |
Embedded Derivative Financial Instruments [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Derivatives: |  |
Derivative Asset | 137 | 19
Derivatives: [Abstract] |  |
Derivative Liability | 56 |
Embedded Derivative Financial Instruments [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 137 | 19
Derivatives: [Abstract] |  |
Derivative Liability | 56 |
Copper futures and swap contracts [Member] |  |
Derivatives: |  |
Derivative Asset | 7 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 10
Copper futures and swap contracts [Member] | Level 1 |  |
Derivatives: |  |
Derivative Asset | 8 | 1
Derivatives: [Abstract] |  |
Derivative Liability | 2 |
Copper futures and swap contracts [Member] | Level 2 |  |
Derivatives: |  |
Derivative Asset | 1 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 0 |
Copper futures and swap contracts [Member] | Level 3 |  |
Derivatives: |  |
Derivative Asset | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 0 |
Copper futures and swap contracts [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Derivatives: |  |
Derivative Asset | 9 | 1
Derivatives: [Abstract] |  |
Derivative Liability | 2 |
Copper futures and swap contracts [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 9 | 1
Derivatives: [Abstract] |  |
Derivative Liability | 2 |
Africa and onshore California [Member] | Copper futures and swap contracts [Member] | Level 1 |  |
Derivatives: |  |
Derivative Asset | 0 |
Africa and onshore California [Member] | Copper futures and swap contracts [Member] | Level 2 |  |
Derivatives: |  |
Derivative Asset | 46 |
Africa and onshore California [Member] | Copper futures and swap contracts [Member] | Level 3 |  |
Derivatives: |  |
Derivative Asset | 0 |
Africa and onshore California [Member] | Copper futures and swap contracts [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Derivatives: |  |
Derivative Asset | 46 |
Africa and onshore California [Member] | Copper futures and swap contracts [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 46 |
U.S. core fixed income fund [Member] | Level 1 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 0 | 0
Trust Assets Fair Value Disclosure | 0 | 0
U.S. core fixed income fund [Member] | Level 2 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 0 | 0
Trust Assets Fair Value Disclosure | 0 | 0
U.S. core fixed income fund [Member] | Level 3 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 0 | 0
Trust Assets Fair Value Disclosure | 0 | 0
U.S. core fixed income fund [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 23 | 23
Trust Assets Fair Value Disclosure | 53 | 52
U.S. core fixed income fund [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 23 | 23
Trust Assets Fair Value Disclosure | 53 | 52
Money market funds [Member] | Level 1 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 22 | 21
Trust Assets Fair Value Disclosure | 12 | 7
Money market funds [Member] | Level 2 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 0 | 0
Trust Assets Fair Value Disclosure | 0 | 0
Money market funds [Member] | Level 3 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 0 | 0
Trust Assets Fair Value Disclosure | 0 | 0
Money market funds [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 22 | 21
Trust Assets Fair Value Disclosure | 12 | 7
Money market funds [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 22 | 21
Trust Assets Fair Value Disclosure | 12 | 7
Equity securities | Level 1 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 5 | 3
Equity securities | Level 2 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 0 | 0
Equity securities | Level 3 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 0 | 0
Equity securities | Carrying Amount, Fair Value Disclosure [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 5 | 3
Equity securities | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 5 | 3
Government bonds | Level 1 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Government bonds | Level 2 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 36 | 37
Government bonds | Level 3 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Government bonds | Carrying Amount, Fair Value Disclosure [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 36 | 37
Government bonds | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 36 | 37
Government mortgage-backed securities [Member] | Level 1 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Government mortgage-backed securities [Member] | Level 2 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 25 | 28
Government mortgage-backed securities [Member] | Level 3 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Government mortgage-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 25 | 28
Government mortgage-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 25 | 28
Corporate bonds [Member] | Level 1 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Corporate bonds [Member] | Level 2 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 32 | 26
Corporate bonds [Member] | Level 3 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Corporate bonds [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 32 | 26
Corporate bonds [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 32 | 26
Asset-backed securities [Member] | Level 1 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Asset-backed securities [Member] | Level 2 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 16 | 13
Asset-backed securities [Member] | Level 3 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Asset-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 16 | 13
Asset-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 16 | 13
Collateralized Mortgage Backed Securities [Member] | Level 1 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Collateralized Mortgage Backed Securities [Member] | Level 2 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 8 | 7
Collateralized Mortgage Backed Securities [Member] | Level 3 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Collateralized Mortgage Backed Securities [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 8 | 7
Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 8 | 7
Municipal bonds [Member] | Level 1 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Municipal bonds [Member] | Level 2 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 1 | 1
Municipal bonds [Member] | Level 3 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Municipal bonds [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 1 | 1
Municipal bonds [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 1 | 1
Copper futures and swap contracts [Member] | Level 1 |  |
Derivatives: [Abstract] |  |
Derivative Liability |  | 7
Copper futures and swap contracts [Member] | Level 2 |  |
Derivatives: [Abstract] |  |
Derivative Liability |  | 4
Copper futures and swap contracts [Member] | Level 3 |  |
Derivatives: [Abstract] |  |
Derivative Liability |  | 0
Copper futures and swap contracts [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Derivatives: [Abstract] |  |
Derivative Liability |  | 11
Copper futures and swap contracts [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: [Abstract] |  |
Derivative Liability |  | 11
Bank Time Deposits [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |
Other current assets | 28 | 28
Other assets | 122 | 118
Investment Securities [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | 23 | 23
Investment Securities [Member] | U.S. core fixed income fund [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | 23 | 23
Restricted Funds [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | 53 | 52
Restricted Funds [Member] | U.S. core fixed income fund [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | $ 53 | $ 52

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