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Derivatives and Risk Management Activities - Financial Impact (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | $ (53) | $ 89
Commodity Derivatives | Supply and Logistics segment revenues |  |
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | (45) | 96
Commodity Derivatives | Field operating costs |  |
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | 1 | (3)
Interest Rate Derivatives | Interest expense, net |  |
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | 1 | (2)
Foreign Currency Derivatives | Supply and Logistics segment revenues |  |
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | (6) | 2
Preferred Distribution Rate Reset Option | Other expense, net |  |
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | (4) | (4)
Derivatives in Hedging Relationships |  |
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | 1 | (2)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Interest expense, net |  |
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | 1 | (2)
Derivatives Not Designated as a Hedge |  |
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | (54) | 91
Derivatives Not Designated as a Hedge | Commodity Derivatives | Supply and Logistics segment revenues |  |
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | (45) | 96
Derivatives Not Designated as a Hedge | Commodity Derivatives | Field operating costs |  |
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | 1 | (3)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Supply and Logistics segment revenues |  |
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | (6) | 2
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other expense, net |  |
Impact of derivative activities recognized in earnings |  |
Total gain/(loss) on derivatives recognized in net income | $ (4) | $ (4)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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