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Derivative Financial Instruments (Tables)
 3 Months Ended
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