Commodity Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Energy Related Inventory [Abstract]

Inventory Disclosure Table

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

	June 30,		December 31,
millions	2018		2017
Oil	$	221	$	165
Natural gas	14		29
NGLs	114		122
Total commodity inventories	$	349	$	316