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Goodwill
 12 Months Ended
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]  
Goodwill

6.  Goodwill

The changes in the carrying amount of goodwill were as follows:

 

 

Exploration and Production

 

 

Midstream

 

 

Total

 

 

 

(In millions)

 

Balance at December 31, 2016

 

$

—

 

 

$

375

 

 

$

375

 

Dispositions

 

 

—

 

 

 

(15

)

 

 

(15

)

Balance at December 31, 2017

 

$

—

 

 

$

360

 

 

$

360

 

 

The change in the carrying amount of goodwill relates to the sale of our enhanced oil recovery assets in the Permian Basin, including a gas plant and associated CO2 assets.  See Note 2, Dispositions.