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Fair Value Measurement (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | $ 78 | $ 76
Derivatives: |  |
Derivative Asset | 26 | 132
Derivatives: [Abstract] |  |
Derivative Liability | 4 | 44
Other current assets | 196 | 199
Other assets | 2,010 | 1,956
Level 1 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 27 | 27
Trust Assets Fair Value Disclosure | 12 | 12
Derivatives: |  |
Derivative Asset | 5 | 8
Contingent receivable | 0 | 0
Total assets | 44 | 47
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 2
Discontinued Operation, Contingent Payable | 0 | 0
Long-term debt, including current portion | 0 | 0
Total liabilities | 1 | 2
Level 2 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 0 | 0
Trust Assets Fair Value Disclosure | 118 | 118
Derivatives: |  |
Derivative Asset | 97 | 184
Contingent receivable | 0 | 0
Total assets | 215 | 302
Derivatives: [Abstract] |  |
Derivative Liability | 7 | 56
Discontinued Operation, Contingent Payable | 10 | 23
Long-term debt, including current portion | 14,624 | 15,196
Total liabilities | 14,641 | 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 | 135 | 135
Total assets | 135 | 135
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 0
Discontinued Operation, Contingent Payable | 0 | 0
Long-term debt, including current portion | 0 | 0
Total liabilities | 0 | 0
Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 51 | 50
Trust Assets Fair Value Disclosure | 184 | 183
Derivatives: |  |
Derivative Asset | 102 | 192
Contingent receivable | 135 | 135
Total assets | 472 | 560
Derivatives: [Abstract] |  |
Derivative Liability | 8 | 58
Discontinued Operation, Contingent Payable | 10 | 23
Long-term debt, including current portion | 14,624 | 15,196
Total liabilities | 14,642 | 15,277
Reported Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 51 | 50
Trust Assets Fair Value Disclosure | 184 | 183
Derivatives: |  |
Derivative Asset | 102 | 192
Contingent receivable | 150 | 150
Derivatives: [Abstract] |  |
Derivative Liability | 8 | 58
Discontinued Operation, Contingent Payable | 10 | 23
Long-term debt, including current portion | 15,363 | 16,027
Embedded Derivative Financial Instruments [Member] |  |
Derivatives: |  |
Derivative Asset | 21 | 125
Derivatives: [Abstract] |  |
Derivative Liability | 4 | 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 | 24 | 137
Derivatives: [Abstract] |  |
Derivative Liability | 7 | 56
Embedded Derivative Financial Instruments [Member] | Level 3 |  |
Derivatives: |  |
Derivative Asset | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 0
Embedded Derivative Financial Instruments [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 24 | 137
Derivatives: [Abstract] |  |
Derivative Liability | 7 | 56
Embedded Derivative Financial Instruments [Member] | Reported Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 24 | 137
Derivatives: [Abstract] |  |
Derivative Liability | 7 | 56
Commodity Contract [Member] |  |
Derivatives: |  |
Derivative Asset | 5 | 7
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 0
Commodity Contract [Member] | Level 1 |  |
Derivatives: |  |
Derivative Asset | 5 | 8
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 2
Commodity Contract [Member] | Level 2 |  |
Derivatives: |  |
Derivative Asset | 1 | 1
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 0
Commodity Contract [Member] | Level 3 |  |
Derivatives: |  |
Derivative Asset | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 0
Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 6 | 9
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 2
Commodity Contract [Member] | Reported Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 6 | 9
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 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 | 72 | 46
Africa and onshore California [Member] | Commodity Contract [Member] | Level 3 |  |
Derivatives: |  |
Derivative Asset | 0 | 0
Africa and onshore California [Member] | Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 72 | 46
Africa and onshore California [Member] | Commodity Contract [Member] | Reported Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 72 | 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] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 24 | 23
Trust Assets Fair Value Disclosure | 54 | 53
U.S. core fixed income fund [Member] | Reported Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 24 | 23
Trust Assets Fair Value Disclosure | 54 | 53
Money market funds [Member] | Level 1 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 22 | 22
Trust Assets Fair Value Disclosure | 12 | 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] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 22 | 22
Trust Assets Fair Value Disclosure | 12 | 12
Money market funds [Member] | Reported Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 22 | 22
Trust Assets Fair Value Disclosure | 12 | 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 | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 5 | 5
Equity securities | Reported 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 | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 36 | 36
Government bonds | Reported Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 36 | 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 | 24 | 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] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 24 | 25
Government mortgage-backed securities [Member] | Reported Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 24 | 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] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 32 | 32
Corporate bonds [Member] | Reported 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 | 18 | 16
Asset-backed securities [Member] | Level 3 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 | 0
Asset-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 18 | 16
Asset-backed securities [Member] | Reported Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 18 | 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 | 7 | 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] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 7 | 8
Collateralized Mortgage Backed Securities [Member] | Reported Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 7 | 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] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 1 | 1
Municipal bonds [Member] | Reported Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 1 | 1
Bank Time Deposits [Member] | Reported Value Measurement [Member] |  |
Derivatives: [Abstract] |  |
Other current assets | 32 | 28
Other assets | 122 | 122
Restricted Funds [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | 54 | 53
Restricted Funds [Member] | U.S. core fixed income fund [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | 54 | 53
Investment Securities [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | 24 | 23
Investment Securities [Member] | U.S. core fixed income fund [Member] |  |
Investment securities (current and long-term): |  |
Alternative Investments, Fair Value Disclosure | 24 | 23
Other Current Assets |  |
Derivatives: |  |
Derivative Asset | 6 | 7
Derivatives: [Abstract] |  |
Derivative Liability | $ 0 | $ 0

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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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