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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |
Other current assets | $ 270 | $ 199
Other assets | 2,270 | 1,956
Derivative Liability, Fair Value, Gross Liability | 33 | 58
Derivatives: |  |
Derivative Asset | 166 | 132
Derivatives: [Abstract] |  |
Derivative Liability | 32 | 44
Level 1 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 5 | 27
Trust Assets Fair Value Disclosure | 11 | 12
Derivatives: |  |
Derivative Asset | 9 | 8
Contingent receivable | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 2
Discontinued Operation, Contingent Payable |  | 0
Long-term debt, including current portion | 0 | 0
Level 2 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 0 | 0
Trust Assets Fair Value Disclosure | 123 | 118
Derivatives: |  |
Derivative Asset | 266 | 184
Contingent receivable | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 32 | 56
Discontinued Operation, Contingent Payable |  | 23
Long-term debt, including current portion | 13,269 | 15,196
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 | 134 | 135
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 0
Discontinued Operation, Contingent Payable |  | 0
Long-term debt, including current portion | 0 | 0
Carrying Amount, Fair Value Disclosure [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 30 | 50
Trust Assets Fair Value Disclosure | 189 | 183
Derivatives: |  |
Derivative Asset | 275 | 192
Contingent receivable | 150 | 150
Derivatives: [Abstract] |  |
Derivative Liability | 33 | 58
Discontinued Operation, Contingent Payable |  | 23
Long-term debt, including current portion | 13,117 | 16,027
Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 30 | 50
Trust Assets Fair Value Disclosure | 189 | 183
Derivatives: |  |
Derivative Asset | 275 | 192
Contingent receivable | 134 | 135
Derivatives: [Abstract] |  |
Derivative Liability | 33 | 58
Discontinued Operation, Contingent Payable |  | 23
Long-term debt, including current portion | 13,269 | 15,196
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 | 31 | 56
Derivatives: |  |
Derivative Asset | 155 | 125
Derivatives: [Abstract] |  |
Derivative Liability | 31 | 44
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 | 155 | 137
Derivatives: [Abstract] |  |
Derivative Liability | 31 | 56
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 | 155 | 137
Derivatives: [Abstract] |  |
Derivative Liability | 31 | 56
Embedded Derivative Financial Instruments [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 155 | 137
Derivatives: [Abstract] |  |
Derivative Liability | 31 | 56
Commodity Contract [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 2 | 2
Derivatives: |  |
Derivative Asset | 11 | 7
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 0
Commodity Contract [Member] | Level 1 |  |
Derivatives: |  |
Derivative Asset |  | 8
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 2
Commodity Contract [Member] | Level 2 |  |
Derivatives: |  |
Derivative Asset |  | 1
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 0
Commodity Contract [Member] | Level 3 |  |
Derivatives: |  |
Derivative Asset |  | 0
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 0
Commodity Contract [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Derivatives: |  |
Derivative Asset |  | 9
Derivatives: [Abstract] |  |
Derivative Liability | 2 | 2
Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset |  | 9
Derivatives: [Abstract] |  |
Derivative Liability | 2 | 2
Future [Member] | Level 1 |  |
Derivatives: |  |
Derivative Asset | 9 |
Future [Member] | Level 2 |  |
Derivatives: |  |
Derivative Asset | 2 |
Future [Member] | Level 3 |  |
Derivatives: |  |
Derivative Asset | 0 |
Future [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Derivatives: |  |
Derivative Asset | 11 |
Future [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 11 |
Forward Contracts [Member] | Level 1 |  |
Derivatives: |  |
Derivative Asset | 0 |
Forward Contracts [Member] | Level 2 |  |
Derivatives: |  |
Derivative Asset | 1 |
Forward Contracts [Member] | Level 3 |  |
Derivatives: |  |
Derivative Asset | 0 |
Forward Contracts [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Derivatives: |  |
Derivative Asset | 1 |
Forward Contracts [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 1 |
Africa and onshore California [Member] | Commodity Contract [Member] | Level 1 |  |
Derivatives: |  |
Derivative Asset | 0 |
Africa and onshore California [Member] | Commodity Contract [Member] | Level 2 |  |
Derivatives: |  |
Derivative Asset | 108 |
Africa and onshore California [Member] | Commodity Contract [Member] | Level 3 |  |
Derivatives: |  |
Derivative Asset | 0 |
Africa and onshore California [Member] | Commodity Contract [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Derivatives: |  |
Derivative Asset | 108 | 46
Africa and onshore California [Member] | Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 108 | 46
Africa and onshore California [Member] | Forward Contracts [Member] | Level 1 |  |
Derivatives: |  |
Derivative Asset |  | 0
Africa and onshore California [Member] | Forward Contracts [Member] | Level 2 |  |
Derivatives: |  |
Derivative Asset |  | 46
Africa and onshore California [Member] | Forward Contracts [Member] | Level 3 |  |
Derivatives: |  |
Derivative Asset |  | 0
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 | 25 | 23
Trust Assets Fair Value Disclosure | 55 | 53
U.S. core fixed income fund [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 25 | 23
Trust Assets Fair Value Disclosure | 55 | 53
Money market funds [Member] | Level 1 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities |  | 22
Trust Assets Fair Value Disclosure | 11 | 12
Money market funds [Member] | Level 2 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities |  | 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
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
Trust Assets Fair Value Disclosure | 11 | 12
Money market funds [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities |  | 22
Trust Assets Fair Value Disclosure | 11 | 12
Equity securities | Level 1 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 5 | 5
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 | 5
Equity securities | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 5 | 5
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 | 40 | 36
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 | 40 | 36
Government bonds | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 40 | 36
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 | 27 | 25
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 | 27 | 25
Government mortgage-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 27 | 25
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 | 32
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 | 32
Corporate bonds [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 32 | 32
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 | 15 | 16
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 | 15 | 16
Asset-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 15 | 16
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 | 8
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 | 8
Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 8 | 8
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
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 | 52 | 28
Other assets | 123 | 122
Investment Securities [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investment, Fair Value Disclosure | 25 | 23
Investment Securities [Member] | U.S. core fixed income fund [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investment, Fair Value Disclosure | 25 | 23
Restricted Funds [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investment, Fair Value Disclosure | 55 | 53
Restricted Funds [Member] | U.S. core fixed income fund [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investment, Fair Value Disclosure | 55 | 53
Derivatives Not Designated as Hedging Instruments [Member] | 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 | 31 | 56
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: [Abstract] |  |
Long-term debt, including current portion | 112 | $ 98
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Derivatives Not Designated as Hedging Instruments [Member] | 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 | $ 24 |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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