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Goodwill
 6 Months Ended
Jun. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]  
Goodwill

4.  Goodwill

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

 

 

Exploration and Production

 

 

Midstream

 

 

Total

 

Balance at January 1, 2017

 

$

—

 

 

$

375

 

 

$

375

 

Asset held for sale

 

 

—

 

 

 

(25

)

 

 

(25

)

Balance at June 30, 2017

 

$

—

 

 

$

350

 

 

$

350

 

In the second quarter of 2017, we transferred $25 million of goodwill related to our Midstream segment assets in the Permian Basin to Assets held for sale in the Consolidated Balance Sheet.  See Note 12, Subsequent Event.