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Fair Value Measurement (Fair Value Measurement Inputs) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |
Other current assets | $ 241 | $ 199
Other assets | 1,790 | 1,956
Investment securities (current and long-term): |  |
Alternative Investment, Fair Value Disclosure | 80 | 76
Derivatives: |  |
Derivative Asset | 78 | 132
Derivatives: [Abstract] |  |
Derivative Liability | 45 | 44
Level 1 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 27 | 27
Trust Assets Fair Value Disclosure | 18 | 12
Derivatives: |  |
Derivative Asset | 5 | 8
Contingent receivable | 0 | 0
Total assets | 50 | 47
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 2
Discontinued Operation, Contingent Payable |  | 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 | 116 | 118
Derivatives: |  |
Derivative Asset | 156 | 184
Contingent receivable | 0 | 0
Total assets | 272 | 302
Derivatives: [Abstract] |  |
Derivative Liability | 47 | 56
Discontinued Operation, Contingent Payable |  | 23
Long-term debt, including current portion | 14,735 | 15,196
Total liabilities | 14,782 | 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 | 138 | 135
Total assets | 138 | 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 | 189 | 183
Derivatives: |  |
Derivative Asset | 161 | 192
Contingent receivable | 150 | 150
Derivatives: [Abstract] |  |
Derivative Liability | 48 | 58
Discontinued Operation, Contingent Payable |  | 23
Long-term debt, including current portion | 14,782 | 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 | 189 | 183
Derivatives: |  |
Derivative Asset | 161 | 192
Contingent receivable | 138 | 135
Total assets | 540 | 560
Derivatives: [Abstract] |  |
Derivative Liability | 48 | 58
Discontinued Operation, Contingent Payable |  | 23
Long-term debt, including current portion | 14,735 | 15,196
Total liabilities | 14,783 | 15,277
Embedded Derivative Financial Instruments [Member] |  |
Derivatives: |  |
Derivative Asset | 73 | 125
Derivatives: [Abstract] |  |
Derivative Liability | 45 | 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 | 74 | 137
Derivatives: [Abstract] |  |
Derivative Liability | 46 | 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 | 74 | 137
Derivatives: [Abstract] |  |
Derivative Liability | 46 | 56
Embedded Derivative Financial Instruments [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 74 | 137
Derivatives: [Abstract] |  |
Derivative Liability | 46 | 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 | 2 | 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 | 7 | 9
Derivatives: [Abstract] |  |
Derivative Liability | 2 | 2
Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 7 | 9
Derivatives: [Abstract] |  |
Derivative Liability | 2 | 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 | 80 | 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 | 80 | 46
Africa and onshore California [Member] | Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivatives: |  |
Derivative Asset | 80 | 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 | 21 | 22
Trust Assets Fair Value Disclosure | 18 | 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 | 21 | 22
Trust Assets Fair Value Disclosure | 18 | 12
Money market funds [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 21 | 22
Trust Assets Fair Value Disclosure | 18 | 12
Equity securities | Level 1 |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 6 | 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 | 6 | 5
Equity securities | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Available-for-sale Securities | 6 | 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 | 38 | 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 | 38 | 36
Government bonds | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 38 | 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 | 30 | 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 | 30 | 32
Corporate bonds [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 30 | 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 | 25 | 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 | 25 | 25
Government mortgage-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 25 | 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 | 14 | 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 | 14 | 16
Asset-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 14 | 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 | 41 | 28
Other assets | 122 | 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

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