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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss [1] $ (14) $ (16)
Other Comprehensive Income (Loss), Net of Tax [2] (2)  
Pension Plan [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss [1] (13) (14)
Other Comprehensive Income (Loss), Net of Tax [2] (1)  
Other Postretirement Benefits Plan [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss [1] (1) $ (2)
Other Comprehensive Income (Loss), Net of Tax [2] $ (1)  
[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.