Other Current Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Prepaid Expense and Other Assets, Current [Abstract]
Deferred charges	$ 45	$ 0	[1]
Inventories	22	12	[1]
Prepayments	12	15	[1]
Total Other Current Assets	79	27	[2]
Accrued Liabilities, Current [Abstract]
Deferred income	24	23	[3]
Taxes other than income taxes	22	20	[3]
Employee costs	11	7	[3]
Asset retirement obligation	10	11	[3]
Accrued environmental liabilities	4	12	[3]
Other	10	11	[3]
Total Other Current Liabilities	$ 81	$ 84	[2]

[1] Adjusted to include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.

[2] Adjusted to include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.

[3] Adjusted to include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.