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Dispositions Dispositions (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 07, 2017
Jan. 27, 2016
Jan. 01, 2016
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Impairment of Long-Lived Assets Held-for-use       $ 90   $ 235 $ 258 $ 394
Proceeds from the sale of businesses, net of cash sold, and equity method investments             33 156
Gain (Loss) on Disposition of Business       48   17 48 (30)
Proceeds from sale of ownership interest             0 (134)
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Kazakhstan [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from the sale of businesses, net of cash sold, and equity method investments $ 24              
Gain (Loss) on Disposition of Business $ 48              
Pre-tax income of disposed businesses, Excluding gain on disposal, included in continuing operations       0   0 $ 13 7
UK Wind Projects [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Gain (Loss) on Disposition of Business           20    
Kazakhstan [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Impairment of Long-Lived Assets Held-for-use       $ 0 $ 94 $ 0   $ 0
DPLER [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from the sale of businesses, net of cash sold, and equity method investments     $ 76          
Gain (Loss) on Disposition of Business     $ (49)          
Kelanitissa [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from the sale of businesses, net of cash sold, and equity method investments   $ 18            
Gain (Loss) on Disposition of Business   $ 5