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FAIR VALUE MEASUREMENT (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) $ / bbl | Dec. 31, 2018 USD ($) $ / bbl | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) $ / bbl
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Other current assets | $ 655 | $ 422 |  |
Other assets | 1,885 | 2,172 |  |
Other assets | 109 | 93 | $ 72 |
Derivative Liability, Fair Value, Gross Liability | 21 | 48 |  |
Derivatives: |  |  |  |
Derivative Asset | 74 | 16 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 21 | 41 |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Investments, Fair Value Disclosure | 27 | 25 |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 59 | 55 |  |
Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Investments, Fair Value Disclosure | 4 | 4 |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 3 | 5 |  |
Derivatives: |  |  |  |
Derivative Asset | 5 | 0 |  |
Contingent receivable | 0 | 0 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 0 | 7 |  |
Long-term debt, including current portion | 0 | 0 |  |
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Investments, Fair Value Disclosure | 0 | 0 |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 134 | 121 |  |
Derivatives: |  |  |  |
Derivative Asset | 80 | 96 |  |
Contingent receivable | 0 | 0 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 21 | 41 |  |
Long-term debt, including current portion | 10,239 | 10,238 |  |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Investments, Fair Value Disclosure | 0 | 0 |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Derivatives: |  |  |  |
Derivative Asset | 0 | 0 |  |
Contingent receivable | 108 | 127 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 0 | 0 |  |
Long-term debt, including current portion | 0 | 0 |  |
Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Investments, Fair Value Disclosure | 31 | 29 |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 196 | 181 |  |
Derivatives: |  |  |  |
Derivative Asset | 85 | 96 |  |
Contingent receivable | 122 | 143 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 21 | 48 |  |
Long-term debt, including current portion | 9,826 | 11,141 |  |
Estimate of Fair Value Measurement [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Investments, Fair Value Disclosure | 31 | 29 |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 196 | 181 |  |
Derivatives: |  |  |  |
Derivative Asset | 85 | 96 |  |
Contingent receivable | 108 | 127 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 21 | 48 |  |
Long-term debt, including current portion | 10,239 | 10,238 |  |
Embedded Derivative Financial Instruments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 20 | 39 |  |
Derivatives: |  |  |  |
Derivative Asset | 68 | 16 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 20 | 32 |  |
Embedded Derivative Financial Instruments [Member] | Level 1 |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 0 | 0 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 0 | 0 |  |
Embedded Derivative Financial Instruments [Member] | Level 2 |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 68 | 23 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 20 | 39 |  |
Embedded Derivative Financial Instruments [Member] | Level 3 |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 0 | 0 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 0 | 0 |  |
Embedded Derivative Financial Instruments [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 68 | 23 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 20 | 39 |  |
Embedded Derivative Financial Instruments [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 68 | 23 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 20 | 39 |  |
Commodity Contract [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 1 | 9 |  |
Derivatives: |  |  |  |
Derivative Asset | 6 | 0 |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 1 | 9 |  |
Commodity Contract [Member] | Level 1 |  |  |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 0 | 7 |  |
Commodity Contract [Member] | Level 2 |  |  |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 1 | 2 |  |
Commodity Contract [Member] | Level 3 |  |  |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 0 | 0 |  |
Commodity Contract [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 1 | 9 |  |
Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Derivatives: [Abstract] |  |  |  |
Derivative Liability | 1 | 9 |  |
Future [Member] | Level 1 |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 5 |  |  |
Future [Member] | Level 2 |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 1 |  |  |
Future [Member] | Level 3 |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 0 |  |  |
Future [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 6 |  |  |
Future [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 6 |  |  |
Africa and onshore California [Member] | Commodity Contract [Member] | Level 1 |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 0 | 0 |  |
Africa and onshore California [Member] | Commodity Contract [Member] | Level 2 |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 11 | 73 |  |
Africa and onshore California [Member] | Commodity Contract [Member] | Level 3 |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 0 | 0 |  |
Africa and onshore California [Member] | Commodity Contract [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 11 | 73 |  |
Africa and onshore California [Member] | Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Derivatives: |  |  |  |
Derivative Asset | 11 | 73 |  |
U.S. core fixed income fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Marketable Securities | 27 | 25 |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 59 | 55 |  |
U.S. core fixed income fund [Member] | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Marketable Securities | 0 | 0 |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
U.S. core fixed income fund [Member] | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Marketable Securities | 0 | 0 |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
U.S. core fixed income fund [Member] | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Marketable Securities | 0 | 0 |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
U.S. core fixed income fund [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Marketable Securities | 27 | 25 |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 59 | 55 |  |
U.S. core fixed income fund [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Marketable Securities | 27 | 25 |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 59 | 55 |  |
Money market funds [Member] | Level 1 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 3 | 5 |  |
Money market funds [Member] | Level 2 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Money market funds [Member] | Level 3 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Money market funds [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 3 | 5 |  |
Money market funds [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 3 | 5 |  |
Equity securities | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Marketable Securities | 4 | 4 |  |
Equity securities | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Marketable Securities | 0 | 0 |  |
Equity securities | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Marketable Securities | 0 | 0 |  |
Equity securities | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Marketable Securities | 4 | 4 |  |
Equity securities | Estimate of Fair Value Measurement [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Marketable Securities | 4 | 4 |  |
Government bonds | Level 1 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Government bonds | Level 2 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 36 | 36 |  |
Government bonds | Level 3 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Government bonds | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 36 | 36 |  |
Government bonds | Estimate of Fair Value Measurement [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 36 | 36 |  |
Government mortgage-backed securities [Member] | Level 1 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Government mortgage-backed securities [Member] | Level 2 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 43 | 38 |  |
Government mortgage-backed securities [Member] | Level 3 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Government mortgage-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 43 | 38 |  |
Government mortgage-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 43 | 38 |  |
Corporate bonds [Member] | Level 1 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Corporate bonds [Member] | Level 2 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 33 | 28 |  |
Corporate bonds [Member] | Level 3 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Corporate bonds [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 33 | 28 |  |
Corporate bonds [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 33 | 28 |  |
Asset-backed securities [Member] | Level 1 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Asset-backed securities [Member] | Level 2 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 14 | 11 |  |
Asset-backed securities [Member] | Level 3 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Asset-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 14 | 11 |  |
Asset-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 14 | 11 |  |
Collateralized Mortgage Backed Securities [Member] | Level 1 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Collateralized Mortgage Backed Securities [Member] | Level 2 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 7 | 7 |  |
Collateralized Mortgage Backed Securities [Member] | Level 3 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Collateralized Mortgage Backed Securities [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 7 | 7 |  |
Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 7 | 7 |  |
Municipal bonds [Member] | Level 1 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Municipal bonds [Member] | Level 2 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 1 | 1 |  |
Municipal bonds [Member] | Level 3 |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |  |
Municipal bonds [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 1 | 1 |  |
Municipal bonds [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Trust Assets Fair Value Disclosure | 1 | 1 |  |
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 | 100 | 109 |  |
Other assets | 157 | 126 |  |
Derivatives Not Designated as Hedging Instruments | Embedded Derivative Financial Instruments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 20 | 39 |  |
Freeport-McMoRan Oil & Gas | Onshore California |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Other assets | 11 | 16 |  |
Other assets | 50 | 50 |  |
Derivatives: |  |  |  |
Contingent receivable | 50 |  |  | $ 150
Derivatives: [Abstract] |  |  |  |
Contingent consideration asset, per year |  |  |  | 50
Freeport-McMoRan Oil & Gas | Deepwater Gulf of Mexico Interests |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |
Other current assets | 18 | 27 |  |
Other assets | $ 104 | $ 116 |  |
Derivatives: |  |  |  |
Contingent receivable |  |  |  | $ 150
Crude Oil | Freeport-McMoRan Oil & Gas | Onshore California |  |  |  |
Derivatives: [Abstract] |  |  |  |
Contingent consideration, reference threshold, price per barrel (in us dollars per pound) | $ / bbl | 70 | 70 |  | 70

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