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Fair Value Measurements, Recurring (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |
Investments of certain benefit plans | $ 71 | $ 69
Total gross fair value, assets | 972 | 984
Effect of Counterparty Netting | (882) | (875)
Effect of Cash Collateral Netting | (11) | 0
Net Carrying Value on Balance Sheet, Assets | 79 | 109
Liabilities: |  |
Environmental credit obligations | 231 | 188
Total gross fair value, liabilities | 1,230 | 1,088
Effect of Counterparty Netting | (882) | (875)
Effect of Cash Collateral Netting | (108) | (20)
Net Carrying Value on Balance Sheet, Liabilities | 240 | 193
Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 895 | 912
Effect of Counterparty Netting | (882) | (875)
Effect of Cash Collateral Netting | (11) | 0
Derivative contracts, net assets | 2 | 37
Cash Collateral Received Not Offset | 0 | 0
Liabilities: |  |
Derivative contracts | 990 | 895
Effect of Counterparty Netting | (882) | (875)
Effect of Cash Collateral Netting | (108) | (20)
Derivative contracts, net liabilities | 0 | 0
Cash Collateral Paid Not Offset | (171) | (88)
Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts | 6 | 3
Derivative contracts, net assets | 6 | 3
Liabilities: |  |
Derivative contracts | 1 |
Derivative contracts, net liabilities | 1 |
Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 8 | 5
Derivative contracts, net liabilities | 8 | 5
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Investments of certain benefit plans | 63 | 58
Total gross fair value, assets | 930 | 935
Liabilities: |  |
Environmental credit obligations | 0 | 0
Total gross fair value, liabilities | 975 | 872
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 861 | 874
Liabilities: |  |
Derivative contracts | 974 | 872
Fair Value, Inputs, Level 1 [Member] | Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts | 6 | 3
Liabilities: |  |
Derivative contracts | 1 |
Fair Value, Inputs, Level 1 [Member] | Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Investments of certain benefit plans | 0 | 0
Total gross fair value, assets | 34 | 38
Liabilities: |  |
Environmental credit obligations | 231 | 188
Total gross fair value, liabilities | 255 | 216
Fair Value, Inputs, Level 2 [Member] | Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 34 | 38
Liabilities: |  |
Derivative contracts | 16 | 23
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts | 0 | 0
Liabilities: |  |
Derivative contracts | 0 |
Fair Value, Inputs, Level 2 [Member] | Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 8 | 5
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Investments of certain benefit plans | 8 | 11
Total gross fair value, assets | 8 | 11
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] | Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts | 0 | 0
Liabilities: |  |
Derivative contracts | 0 |
Fair Value, Inputs, Level 3 [Member] | Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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