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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
As of December 31, 2018, MPLX had no outstanding commodity contracts.
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
The impact of MPLX’s derivative instruments on its Consolidated Balance Sheets is summarized below:
(In millions)
 
December 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
 
$
—

 
$
(7
)
 
$
—

 
$
(14
)
Other noncurrent assets /Deferred credits and other liabilities
 
—

 
(54
)
 
—

 
(52
)
Total
 
$
—

 
$
(61
)
 
$
—

 
$
(66
)

(1)
Includes embedded derivatives in commodity contracts as discussed above.
Derivative Instruments, Gain (Loss) [Table Text Block]
The impact of MPLX’s derivative contracts not designated as hedging instruments and the location of gains and losses recognized on the Consolidated Statements of Income is summarized below:
 
 
December 31,
(In millions)
 
2018
 
2017
 
2016
Product sales
 
 
 
 
 
 
Realized gains/(losses)
 
$
4

 
$
(9
)
 
$
2

Unrealized gains/(losses)
 
2

 
4

 
(15
)
Total derivative gains/(losses) related to product sales
 
6

 
(5
)
 
(13
)
Purchased product costs
 
 
 
 
 
 
Realized losses
 
(12
)
 
(9
)
 
(5
)
Unrealized gains/(losses)
 
3

 
(10
)
 
(22
)
Total derivative loss related to purchased product costs
 
(9
)
 
(19
)
 
(27
)
Cost of revenues
 
 
 
 
 
 
Realized losses
 
—

 
—

 
(3
)
Unrealized gains
 
—

 
—

 
1

Total derivative losses related to cost of revenues
 
—

 
—

 
(2
)
Total derivative losses
 
$
(3
)
 
$
(24
)
 
$
(42
)