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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] The following table presents the financial instruments carried at fair value on a recurring basis as of December 31, 2019 and 2018 by fair value hierarchy level. MPLX has elected to offset the fair value amounts recognized for multiple derivative contracts executed with the same counterparty.

 
December 31,
 
2019
 
2018
(In millions)
Assets
 
Liabilities
 
Assets
 
Liabilities
Significant unobservable inputs (Level 3)
 
 
 
 
 
 
 
Embedded derivatives in commodity contracts
$
—

 
$
(60
)
 
$
—

 
$
(61
)
Total carrying value on Consolidated Balance Sheets
$
—

 
$
(60
)
 
$
—

 
$
(61
)
Fair Value Inputs Assets and Liabilities Quantitative Information [Table Text Block]
Level 3 instruments include all NGL transactions and embedded derivatives in commodity contracts. The embedded derivative liability relates to a natural gas purchase commitment embedded in a keep-whole processing agreement. The fair value calculation for these Level 3 instruments used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from $0.43 to $1.23 and (2) the probability of renewal of 94 percent for the first five-year term and 83 percent for the second five-year term of the gas purchase commitment and related keep-whole processing agreement. Increases or decreases in the fractionation spread result in an increase or decrease in the fair value of the embedded derivative liability, respectively. An increase in the probability of renewal would result in an increase in the fair value of the related embedded derivative liability. Beyond the embedded derivative discussed above, we had no outstanding commodity contracts as of December 31, 2019 or December 31, 2018.

Schedule of changes in Level 3 fair value measurements [Table Text Block]
The following table is a reconciliation of the net beginning and ending balances recorded for net assets and liabilities classified as Level 3 in the fair value hierarchy.
 
2019
 
2018
(In millions)
Commodity Derivative Contracts (net)
 
Embedded Derivatives in Commodity Contracts (net)
 
Commodity Derivative Contracts (net)
 
Embedded Derivatives in Commodity Contracts (net)
Fair value at beginning of period
$
—

 
$
(61
)
 
$
(2
)
 
$
(64
)
Total gains/(losses) (realized and unrealized) included in earnings(1)
—

 
(5
)
 
6

 
(9
)
Settlements
—

 
6

 
(4
)
 
12

Fair value at end of period
—

 
(60
)
 
—

 
(61
)
The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to liabilities still held at end of period
$
—

 
$
(5
)
 
$
—

 
$
(8
)
(1)
Gains and losses on commodity derivatives classified as Level 3 are recorded in “Product sales” on the Consolidated Statements of Income. Gains and losses on derivatives embedded in commodity contracts are recorded in “Purchased product costs” and “Cost of revenues” on the Consolidated Statements of Income.
Fair Value, by Balance Sheet Grouping [Table Text Block] The following table summarizes the fair value and carrying value of the long-term debt, excluding finance leases, and SMR liability.
 
December 31,
 
2019
 
2018
(In millions)
Fair Value
 
Carrying Value
 
Fair Value
 
Carrying Value
Long-term debt
$
21,054

 
$
19,800

 
$
18,070

 
$
18,511

SMR liability
$
90

 
$
80

 
$
92

 
$
86