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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Level 3 |  |
Rollforward of Level 3 Net Asset/(Liability) |  |
Beginning Balance | $ (36) | $ 11
Net gains for the period included in earnings | 12 | 28
Settlements | 4 | (10)
Derivatives entered into during the period | (10) | (65)
Ending Balance | (30) | (36)
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period | 5 | (36)
Recurring Fair Value Measures |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | (335) | (373)
Recurring Fair Value Measures | Commodity Derivatives |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | (281) | (288)
Recurring Fair Value Measures | Interest Rate Derivatives |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | (36) | (50)
Recurring Fair Value Measures | Foreign Currency Derivatives |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | 4 | (3)
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | (22) | (32)
Recurring Fair Value Measures | Level 1 |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | 5 | (113)
Recurring Fair Value Measures | Level 1 | Commodity Derivatives |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | 5 | (113)
Recurring Fair Value Measures | Level 2 |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | (310) | (224)
Recurring Fair Value Measures | Level 2 | Commodity Derivatives |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | (278) | (171)
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | (36) | (50)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | 4 | (3)
Recurring Fair Value Measures | Level 3 |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | (30) | (36)
Recurring Fair Value Measures | Level 3 | Commodity Derivatives |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | (8) | (4)
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option |  |
Recurring Fair Value Measurements |  |
Net derivative asset/(liability) | $ (22) | $ (32)

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- Definition Amount of derivatives entered into classified as a derivative asset (liability) after deduction of derivative asset (liability), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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- Definition Amount of unrealized gain (loss) recognized in the income statement for a financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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