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Divestitures (Tables)
6 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Schedule of Proceeds Received and Gains (Losses) Recognized on Divestitures
The following summarizes the proceeds received and gains (losses) recognized on divestitures:
 
Six Months Ended
 
June 30,
millions
2019

 
2018

Proceeds received, net of closing adjustments
$
31

 
$
384

Gains (losses) on divestitures, net
1

 
28