Commodity Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Energy Related Inventory [Abstract]

Inventory Disclosure Table

The following summarizes the major classes of commodity inventories included in other current assets:

millions	March 31, 2019			December 31, 2018
Oil		$	169		$	139
Natural gas		1			18
NGLs		84			78
Total commodity inventories		$	254		$	235