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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2018
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 March 31, 2018.
(In millions)
Pension
Benefits
 
Other
Post-Retirement Benefits
 
Total
Balance as of December 1, 2017(1)
$
(13
)
 
$
(1
)
 
$
(14
)
Other comprehensive loss - remeasurements(2)
(1
)
 
(1
)
 
(2
)
Balance as of March 31, 2018(1)
$
(14
)

$
(2
)

$
(16
)

(1)
These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost by LOOP and Explorer and are therefore included in 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. The Partnership records an adjustment to comprehensive income in accordance with its ownership interest in LOOP and Explorer.