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Acquisitions and Dispositions - Dispositions (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
asset
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Recognized gains/(losses) related to sale of assets, net       $ (2) $ 1
Assets classified as held for sale       0  
Proceeds from sales of assets     $ 654 $ 5 $ 28
Disposed of by sale | Forecast          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sales of assets $ 70 $ 310      
Non-core assets sold | asset   2      
Disposed of by sale | Depreciation and amortization          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Recognized gains/(losses) related to sale of assets, net     100    
Recognized gains related to sale of assets     158    
Recognized losses related to sales of assets     58    
Goodwill | Held-for-sale | Depreciation and amortization          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Impairment losses     15    
Other current assets | Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Assets classified as held for sale     $ 275