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Fair Value Measurement (Fair Value Measurement Inputs) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |
Other current assets | $ 211 | $ 199
Other assets | 1,957 | 1,956
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | 80 | 76
Derivatives: |  |
Derivative Asset | 64 | 132
Derivatives: [Abstract] |  |
Derivative Liability | 14 | 44
Level 1 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 27 | 27
Trust Assets Fair Value Disclosure | 11 | 12
Derivatives: |  |
Derivative Asset | 5 | 8
Contingent receivable | 0 | 0
Total assets | 43 | 47
Derivatives: [Abstract] |  |
Derivative Liability | 3 | 2
Discontinued Operation, Contingent Payable |  | 0
Long-term debt, including current portion | 0 | 0
Total liabilities | 3 | 2
Level 2 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 0 | 0
Trust Assets Fair Value Disclosure | 122 | 118
Derivatives: |  |
Derivative Asset | 139 | 184
Contingent receivable | 0 | 0
Total assets | 261 | 302
Derivatives: [Abstract] |  |
Derivative Liability | 15 | 56
Discontinued Operation, Contingent Payable |  | 23
Long-term debt, including current portion | 14,744 | 15,196
Total liabilities | 14,759 | 15,275
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 | 137 | 135
Total assets | 137 | 135
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 | 52 | 50
Trust Assets Fair Value Disclosure | 188 | 183
Derivatives: |  |
Derivative Asset | 144 | 192
Contingent receivable | 150 | 150
Derivatives: [Abstract] |  |
Derivative Liability | 18 | 58
Discontinued Operation, Contingent Payable |  | 23
Long-term debt, including current portion | 15,354 | 16,027
Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 52 | 50
Trust Assets Fair Value Disclosure | 188 | 183
Derivatives: |  |
Derivative Asset | 144 | 192
Contingent receivable | 137 | 135
Total assets | 521 | 560
Derivatives: [Abstract] |  |
Derivative Liability | 18 | 58
Discontinued Operation, Contingent Payable |  | 23
Long-term debt, including current portion | 14,744 | 15,196
Total liabilities | 14,762 | 15,277
Embedded Derivative Financial Instruments [Member] |  |
Derivatives: |  |
Derivative Asset | 58 | 125
Derivatives: [Abstract] |  |
Derivative Liability | 10 | 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 | 62 | 137
Derivatives: [Abstract] |  |
Derivative Liability | 14 | 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 | 62 | 137
Derivatives: [Abstract] |  |
Derivative Liability | 14 | 56
Embedded Derivative Financial Instruments [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 62 | 137
Derivatives: [Abstract] |  |
Derivative Liability | 14 | 56
Commodity Contract [Member] |  |
Derivatives: |  |
Derivative Asset | 6 | 7
Derivatives: [Abstract] |  |
Derivative Liability | 4 | 0
Commodity Contract [Member] | Level 1 |  |
Derivatives: |  |
Derivative Asset | 5 | 8
Derivatives: [Abstract] |  |
Derivative Liability | 3 | 2
Commodity Contract [Member] | Level 2 |  |
Derivatives: |  |
Derivative Asset | 1 | 1
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 0
Commodity Contract [Member] | Level 3 |  |
Derivatives: |  |
Derivative Asset | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 0
Commodity Contract [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |
Derivatives: |  |
Derivative Asset | 6 | 9
Derivatives: [Abstract] |  |
Derivative Liability | 4 | 2
Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 6 | 9
Derivatives: [Abstract] |  |
Derivative Liability | 4 | 2
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 | 76 | 46
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 | 76 | 46
Africa and onshore California [Member] | Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 76 | 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 | 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 | 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 | 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 | 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 | 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 | 36 | 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 | 36 | 36
Government bonds | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 36 | 36
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
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 | 28 | 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 | 28 | 25
Government mortgage-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 28 | 25
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 | 17 | 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 | 17 | 16
Asset-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 17 | 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 | 34 | 28
Other assets | 122 | 122
Investment Securities [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | 25 | 23
Investment Securities [Member] | U.S. core fixed income fund [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | 25 | 23
Restricted Funds [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | 55 | 53
Restricted Funds [Member] | U.S. core fixed income fund [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | $ 55 | $ 53

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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption, parenthetical disclosure or within the fair value disclosures required in the footnote disclosures to the financial statements. This item represents the amount of trust assets (current and long-term) existing as of the balance sheet date. + References No definition available. + Details
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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=73719730&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=73719730&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=51825145&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities 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 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: 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=73719730&loc=d3e13495-108611 Reference 3: 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 4: 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=73719730&loc=d3e13433-108611 Reference 5: 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 6: 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 + Details
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