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Derivative Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | As of March 31, 2018, the Partnership had the following outstanding commodity contracts that were executed to manage the cash flow risk associated with future sales of NGLs and purchases of natural gas:
Derivative contracts not designated as hedging instruments |  | Financial Position |  | Notional Quantity (net)
Natural Gas (MMBtu) |  | Long |  | 745,045 |
NGLs (Gal) |  | Short |  | 7,696,503 |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] |
(In millions) |  | March 31, 2018 |  | December 31, 2017
Derivative contracts not designated as hedging instruments and their balance sheet location |  | Asset |  | Liability |  | Asset |  | Liability
Commodity contracts(1) |  |  |  |  |  |  |  |
Other current assets / other current liabilities |  | $ | — |  |  | $ | (12 | ) |  | $ | — |  |  | $ | (14 | )
Other noncurrent assets / deferred credits and other liabilities |  | — |  |  | (48 | ) |  | — |  |  | (52 | )
Total |  | $ | — |  |  | $ | (60 | ) |  | $ | — |  |  | $ | (66 | )
(1) | Includes embedded derivatives in commodity contracts as discussed above.
Derivative Instruments, Gain (Loss) [Table Text Block] |
| Three Months Ended March 31,
(In millions) | 2018 |  | 2017
Product sales |  |  |
Realized loss | $ | — |  |  | $ | (1 | )
Unrealized gain | 1 |  |  | 7 |
Total derivative gain related to product sales | 1 |  |  | 6 |
Purchased product costs |  |  |
Realized loss | (3 | ) |  | (2 | )
Unrealized gain | 6 |  |  | 9 |
Total derivative gain related to purchased product costs | 3 |  |  | 7 |
Cost of revenues |  |  |
Realized (loss) gain | — |  |  | — |
Unrealized (loss) gain | — |  |  | — |
Total derivative (loss) gain related to cost of revenues | — |  |  | — |
Total derivative gains | $ | 4 |  |  | $ | 13 |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: 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 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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