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Derivative Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

As of September 30, 2020, MPLX had no outstanding commodity contracts beyond the embedded derivative discussed below.
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)
September 30, 2020
 
December 31, 2019
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
$
—

 
$
(4
)
 
$
—

 
$
(5
)
Other noncurrent assets / Deferred credits and other liabilities
—

 
(57
)
 
—

 
(55
)
Total
$
—

 
$
(61
)
 
$
—

 
$
(60
)
(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:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In millions)
2020
 
2019
 
2020
 
2019
Purchased product costs
 
 
 
 
 
 
 
Realized (loss)/gain
$
(2
)
 
$
(2
)
 
$
(4
)
 
$
(5
)
Unrealized (loss)/gain
(10
)
 
11

 
(1
)
 
7

Purchased product costs derivative (loss)/gain
(12
)
 
9

 
(5
)
 
2

 
 
 
 
 
 
 
 
Total derivative (loss)/gain
$
(12
)
 
$
9

 
$
(5
)
 
$
2