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Commodity Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Energy Related Inventory [Abstract]  
Inventory Disclosure Table
The following summarizes the major classes of commodity inventories included in other current assets:
millions
June 30, 2019
 
December 31, 2018
 
Oil
 
$
159

 
$
139

Natural gas
 
7

 
18

NGLs
 
58

 
78

Total commodity inventories
 
$
224

 
$
235