Inventories

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventories

4.  Inventories

Inventories consisted of the following:

	March 31,		December 31,
	2018		2017
	(In millions)
Crude oil and natural gas liquids	$	64	$	59
Materials and supplies		175		173
Total Inventories	$	239	$	232