XML 159 R50.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table shows the changes in “Accumulated other comprehensive loss” by component during the period December 31, 2017 through December 31, 2019:
(In millions)
Pension Benefits
 
Other Post-Retirement Benefits
 
Total
Balance at December 31, 2017(1)
$
(13
)
 
$
(1
)
 
$
(14
)
Other comprehensive loss - remeasurements(2)
(1
)
 
(1
)
 
(2
)
Balance at December 31, 2018(1)
(14
)
 
(2
)
 
(16
)
Other comprehensive income - remeasurements(2)
—

 
1

 
1

Balance as of December 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 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.