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Discontinued Operations Schedule of assets and liabilities classified as held for sale (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventories, net $ 426 $ 423  
Other current assets 81 73  
Property and equipment, net 1,557 1,584  
Goodwill 1,430 1,550 $ 1,694
Intangible assets, net 768 775  
Other noncurrent assets 45 63  
Other 3 1  
Other noncurrent liabilities 125 116  
Discontinued Operations, Held-for-sale [Member]      
Cash 21 16  
Inventories, net 149 150  
Other current assets 16 11  
Property and equipment, net 1,851 1,860  
Goodwill 796 1,068  
Intangible assets, net 477 480  
Other noncurrent assets 3 3  
Other 21 0  
Other noncurrent liabilities $ 54 $ 48