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Derivative Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | As of June 30, 2017, 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)
Crude Oil (bbl) |  | Short |  | 36,800 |
Natural Gas (MMBtu) |  | Long |  | 1,264,924 |
NGLs (gal) |  | Short |  | 58,214,105 |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The impact of the Partnership’s derivative instruments on its Consolidated Balance Sheets is summarized below:
(In millions) |  | June 30, 2017 |  | December 31, 2016
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 |  | $ | 2 |  |  | $ | (6 | ) |  | $ | — |  |  | $ | (13 | )
Other noncurrent assets / deferred credits and other liabilities |  | — |  |  | (37 | ) |  | — |  |  | (47 | )
Total |  | $ | 2 |  |  | $ | (43 | ) |  | $ | — |  |  | $ | (60 | )
(1) | Includes embedded derivatives in commodity contracts as discussed above.
Offsetting Assets and Liabilities [Table Text Block] | The net amounts in the table below equal the balances presented in the Consolidated Balance Sheets:
| June 30, 2017
| Assets |  | Liabilities
(In millions) | Gross Amount |  | Gross Amounts Offset in the Consolidated Balance Sheets |  | Net Amount of Assets in the Consolidated Balance Sheets |  | Gross Amount |  | Gross Amounts Offset in the Consolidated Balance Sheets |  | Net Amount of Liabilities in the Consolidated Balance Sheets
Current |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | $ | 3 |  |  | $ | (1 | ) |  | $ | 2 |  |  | $ | (1 | ) |  | $ | 1 |  |  | $ | — |
Embedded derivatives in commodity contracts | — |  |  | — |  |  | — |  |  | (6 | ) |  | — |  |  | (6 | )
Total current derivative instruments | 3 |  |  | (1 | ) |  | 2 |  |  | (7 | ) |  | 1 |  |  | (6 | )
Non-current |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Embedded derivatives in commodity contracts | — |  |  | — |  |  | — |  |  | (37 | ) |  | — |  |  | (37 | )
Total non-current derivative instruments | — |  |  | — |  |  | — |  |  | (37 | ) |  | — |  |  | (37 | )
Total derivative instruments | $ | 3 |  |  | $ | (1 | ) |  | $ | 2 |  |  | $ | (44 | ) |  | $ | 1 |  |  | $ | (43 | )
Derivative Instruments, Gain (Loss) [Table Text Block] | The impact of the Partnership’s derivative contracts not designated as hedging instruments and the location of gain or (loss) recognized in the Consolidated Statements of Income is summarized below:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Product sales |  |  |  |  |  |  |
Realized (loss) gain | $ | — |  |  | $ | (1 | ) |  | $ | (1 | ) |  | $ | 6 |
Unrealized gain (loss) | 2 |  |  | (6 | ) |  | 9 |  |  | (14 | )
Total derivative gain (loss) related to product sales | 2 |  |  | (7 | ) |  | 8 |  |  | (8 | )
Purchased product costs |  |  |  |  |  |  |
Realized loss(1) | (2 | ) |  | (2 | ) |  | (4 | ) |  | (3 | )
Unrealized gain (loss) | 1 |  |  | (8 | ) |  | 10 |  |  | (9 | )
Total derivative (loss) gain related to purchased product costs | (1 | ) |  | (10 | ) |  | 6 |  |  | (12 | )
Cost of Revenues |  |  |  |  |  |  |
Realized loss(1) | — |  |  | (1 | ) |  | — |  |  | (2 | )
Unrealized gain | — |  |  | 2 |  |  | — |  |  | 2 |
Total derivative gain related to cost of revenues | — |  |  | 1 |  |  | — |  |  | — |
Total derivative gains (losses) | $ | 1 |  |  | $ | (16 | ) |  | $ | 14 |  |  | $ | (20 | )

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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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