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Fair Value Measurements, Recurring (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Investments of certain benefit plans | $ 72 | $ 73
Total gross fair value, assets | 2,156 | 967
Effect of counterparty netting | (2,058) | (893)
Effect of cash collateral netting | 0 | 0
Net carrying value on Balance Sheet, assets | 98 | 74
Liabilities: |  |
Environmental credit obligations | 16 | 104
Total gross fair value, liabilities | 2,149 | 1,086
Effect of counterparty netting | (2,058) | (893)
Effect of cash collateral netting | (61) | (76)
Net carrying value on Balance Sheet, liabilities | 30 | 117
Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 2,084 | 894
Effect of counterparty netting | (2,058) | (893)
Effect of cash collateral netting | 0 | 0
Derivative contracts, net assets | 26 | 1
Cash collateral received not offset | 0 | 0
Liabilities: |  |
Derivative contracts | 2,119 | 969
Effect of counterparty netting | (2,058) | (893)
Effect of cash collateral netting | (61) | (76)
Derivative contracts, net liabilities | 0 | 0
Cash collateral paid not offset | (88) | (102)
Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 11 | 6
Derivative contracts, net liabilities | 11 | 6
Foreign Currency Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 3 | 7
Derivative contracts, net liabilities | 3 | 7
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Investments of certain benefit plans | 63 | 65
Total gross fair value, assets | 2,135 | 940
Liabilities: |  |
Environmental credit obligations | 0 | 0
Total gross fair value, liabilities | 2,112 | 962
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 2,072 | 875
Liabilities: |  |
Derivative contracts | 2,109 | 955
Fair Value, Inputs, Level 1 [Member] | Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Foreign Currency Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 3 | 7
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Investments of certain benefit plans | 0 | 0
Total gross fair value, assets | 12 | 19
Liabilities: |  |
Environmental credit obligations | 16 | 104
Total gross fair value, liabilities | 37 | 124
Fair Value, Inputs, Level 2 [Member] | Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 12 | 19
Liabilities: |  |
Derivative contracts | 10 | 14
Fair Value, Inputs, Level 2 [Member] | Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 11 | 6
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Investments of certain benefit plans | 9 | 8
Total gross fair value, assets | 9 | 8
Liabilities: |  |
Environmental credit obligations | 0 | 0
Total gross fair value, liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 0 | 0
Liabilities: |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | $ 0 | $ 0

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