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Fair Value Measurements, Recurring (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Investments of certain benefit plans | $ 71 | $ 73
Total gross fair value, assets | 1,100 | 967
Effect of Counterparty Netting | (1,013) | (893)
Effect of Cash Collateral Netting | (1) | 0
Net Carrying Value on Balance Sheet, Assets | 86 | 74
Liabilities: |  |
Environmental credit obligations | 87 | 104
Total gross fair value, liabilities | 1,135 | 1,086
Effect of Counterparty Netting | (1,013) | (893)
Effect of Cash Collateral Netting | (33) | (76)
Net Carrying Value on Balance Sheet, Liabilities | 89 | 117
Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 1,026 | 894
Effect of Counterparty Netting | (1,013) | (893)
Effect of Cash Collateral Netting | (1) | 0
Derivative contracts, net assets | 12 | 1
Cash Collateral Received Not Offset | 0 | 0
Liabilities: |  |
Derivative contracts | 1,046 | 969
Effect of Counterparty Netting | (1,013) | (893)
Effect of Cash Collateral Netting | (33) | (76)
Derivative contracts, net liabilities | 0 | 0
Cash Collateral Paid Not Offset | (97) | (102)
Physical Purchase Contracts [Member] |  |
Assets: |  |
Derivative contracts | 2 |
Derivative contracts, net assets | 2 |
Liabilities: |  |
Derivative contracts | 2 | 6
Derivative contracts, net liabilities | 2 | 6
Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts | 1 |
Derivative contracts, net assets | 1 |
Liabilities: |  |
Derivative contracts |  | 7
Derivative contracts, net liabilities |  | 7
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Investments of certain benefit plans | 63 | 65
Total gross fair value, assets | 1,075 | 940
Liabilities: |  |
Environmental credit obligations | 0 | 0
Total gross fair value, liabilities | 1,030 | 962
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 1,011 | 875
Liabilities: |  |
Derivative contracts | 1,030 | 955
Fair Value, Inputs, Level 1 [Member] | Physical Purchase Contracts [Member] |  |
Assets: |  |
Derivative contracts | 0 |
Liabilities: |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts | 1 |
Liabilities: |  |
Derivative contracts |  | 7
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Investments of certain benefit plans | 0 | 0
Total gross fair value, assets | 17 | 19
Liabilities: |  |
Environmental credit obligations | 87 | 104
Total gross fair value, liabilities | 105 | 124
Fair Value, Inputs, Level 2 [Member] | Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 15 | 19
Liabilities: |  |
Derivative contracts | 16 | 14
Fair Value, Inputs, Level 2 [Member] | Physical Purchase Contracts [Member] |  |
Assets: |  |
Derivative contracts | 2 |
Liabilities: |  |
Derivative contracts | 2 | 6
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts | 0 |
Liabilities: |  |
Derivative contracts |  | 0
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Investments of certain benefit plans | 8 | 8
Total gross fair value, assets | 8 | 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] |  |
Assets: |  |
Derivative contracts | 0 |
Liabilities: |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts | $ 0 |
Liabilities: |  |
Derivative contracts |  | $ 0

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