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Accumulated Other Comprehensive Income
 3 Months Ended
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Accumulated Other Comprehensive Loss

MPLX LP records an accumulated other comprehensive loss on the Consolidated Balance Sheets relating to pension and other post-retirement benefits provided by LOOP LLC (“LOOP”) and Explorer Pipeline Company (“Explorer”) to their employees. MPLX LP is not a sponsor of these benefit plans.

The following table shows the changes in “Accumulated other comprehensive loss” by component during the period December 31, 2019 through March 31, 2020.
(In millions)
Pension
Benefits
 
Other
Post-Retirement Benefits
 
Total
Balance at December 31, 2019(1)
$
(14
)
 
$
(1
)
 
$
(15
)
Other comprehensive loss - remeasurements(2)
—

 
(1
)
 
(1
)
Balance at March 31, 2020(1)
(14
)
 
(2
)
 
(16
)

The following table shows the changes in “Accumulated other comprehensive loss” by component during the period December 31, 2018 through March 31, 2019.
(In millions)
Pension
Benefits
 
Other
Post-Retirement Benefits
 
Total
Balance at December 31, 2018(1)
$
(14
)
 
$
(2
)
 
$
(16
)
Other comprehensive income - remeasurements(2)
—

 
1

 
1

Balance at March 31, 2019(1)
$
(14
)
 
$
(1
)
 
$
(15
)
(1)
These components of “Accumulated other comprehensive loss” are included in the computation of net periodic benefit cost by LOOP and Explorer and are therefore included on the Consolidated Statements of Income under the caption “Income/(loss) from equity method investments.”
(2)
Components of other comprehensive income/loss - remeasurements relate to actuarial gains and losses as well as amortization of prior service costs. MPLX records an adjustment to “Comprehensive income” in accordance with its ownership interest in LOOP and Explorer.