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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Energy Related Inventory [Abstract]  
Inventory Disclosure Table
The following summarizes the major classes of inventories included in other current assets:
millions
June 30, 
 2017
 
December 31, 
 2016
Oil
$
120

 
$
169

Natural gas
15

 
38

NGLs
78

 
106

Total inventories
$
213

 
$
313