Inventories

9 Months Ended

Sep. 30, 2017

Energy Related Inventory [Abstract]

Inventories

2. Inventories

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

millions	September 30,   2017		December 31,   2016
Oil	$	127	$	169
Natural gas	29		38
NGLs	108		106
Total inventories	$	264	$	313