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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017 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, 2018
 
December 31, 2017
(In millions)
Assets
 
Liabilities
 
Assets
 
Liabilities
Significant unobservable inputs (Level 3)
 
 
 
 
 
 
 
Commodity contracts
$
—

 
$
—

 
$
—

 
$
(2
)
Embedded derivatives in commodity contracts
—

 
(61
)
 
—

 
(64
)
Total carrying value in Consolidated Balance Sheets
$
—

 
$
(61
)
 
$
—

 
$
(66
)
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 agreement embedded in a keep-whole processing agreement. The fair value calculation for Level 3 instruments at December 31, 2018 used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from $0.58 to $1.01 and (2) the probability of renewal of 90 percent for the first five-year term and 80 percent for the second five-year term of the gas purchase agreement and related keep-whole processing agreement. For commodity contracts, increases in forward NGL prices result in a decrease in the fair value of the derivative assets and an increase in the fair value of derivative liabilities. Increases or decreases in the fractionation spread result in an increase or decrease in the fair value of the embedded derivative liability. An increase in the probability of renewal would result in an increase in the fair value of the related embedded derivative liability.

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.
 
2018
 
2017
(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
$
(2
)
 
$
(64
)
 
$
(6
)
 
$
(54
)
Total gains/(losses) (realized and unrealized) included in earnings(1)
6

 
(9
)
 
(5
)
 
(19
)
Settlements
(4
)
 
12

 
9

 
9

Fair value at end of period
—

 
(61
)
 
(2
)
 
(64
)
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
$
—

 
$
(8
)
 
$
(2
)
 
$
(6
)

(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 capital leases, and SMR liability.
 
December 31,
 
2018
 
2017
(In millions)
Fair Value
 
Carrying Value
 
Fair Value
 
Carrying Value
Long-term debt
$
13,169

 
$
13,484

 
$
7,718

 
$
6,966

SMR liability
$
92

 
$
86

 
$
104

 
$
91