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Inventories
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories

2.  Inventories

Inventories consisted of the following:

 

 

 

June 30,

 

 

December 31,

 

 

 

2017

 

 

2016

 

 

 

(In millions)

 

Crude oil and natural gas liquids

 

$

134

 

 

$

77

 

Materials and supplies

 

 

242

 

 

 

246

 

Total Inventories

 

$

376

 

 

$

323