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Divestitures - Dispositions and Divestitures (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dispositions      
Proceeds from sales of assets   $ 426 $ 389
Recognized gains/(losses) related to sale of assets, net   81  
Depreciation and amortization      
Dispositions      
Recognized gains/(losses) related to sale of assets, net $ 81    
Recognized gains related to sale of assets 105 105  
Recognized losses related to sale of assets $ 24 $ 24