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Acquisitions, Divestitures, and Assets Held for Sale (Tables)
 6 Months Ended
Jun. 30, 2017
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 and assets held for sale for the six months ended June 30:
millions
2017
 
2016
Proceeds received, net of closing adjustments
$
3,460

 
$
900

Gains (losses) on divestitures, net
1,009

 
(102
)