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Derivatives and Risk Management Activities - Financial Impact (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income | $ (198) | $ (324) | $ 156
Loss on ineffective portion of cash flow hedges | 0 | 4 | 0
Commodity Derivatives | Supply and Logistics segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income | (188) | (342) | 208
Commodity Derivatives | Transportation segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income |  | 5 | 8
Commodity Derivatives | Field operating costs |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income | (10) |  | (18)
Commodity Derivatives | Depreciation and amortization |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income | (3) |  |
Interest Rate Derivatives | Interest expense, net |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income | (18) | (14) | (11)
Foreign Currency Derivatives | Supply and Logistics segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income | 8 | (3) | (31)
Preferred Distribution Rate Reset Option | Other income/(expense), net |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income | 13 | 30 |
Derivatives in Hedging Relationships |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income | (21) | (12) | 45
Derivatives in Hedging Relationships | Supply and Logistics segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Loss recognized due to anticipated hedged transactions being probable of not occurring |  | 2 |
Derivatives in Hedging Relationships | Interest expense, net |  |  |
Impact of derivative activities recognized in earnings |  |  |
Loss recognized due to anticipated hedged transactions being probable of not occurring | 10 | 2 | 4
Derivatives in Hedging Relationships | Commodity Derivatives | Supply and Logistics segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income |  | 2 | 56
Derivatives in Hedging Relationships | Commodity Derivatives | Depreciation and amortization |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income | (3) |  |
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 | (18) | (14) | (11)
Derivatives Not Designated as a Hedge |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income | (177) | (312) | 111
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 | (188) | (344) | 152
Derivatives Not Designated as a Hedge | Commodity Derivatives | Transportation segment revenues |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income |  | 5 | 8
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 | (10) |  | (18)
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 | 8 | (3) | $ (31)
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other income/(expense), net |  |  |
Impact of derivative activities recognized in earnings |  |  |
Total gain (loss) on derivatives recognized in net income | $ 13 | $ 30 |

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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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- Definition The amount of net gain (loss) reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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