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Discontinued Operations and Held for sale businesses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 21, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax   $ 0   $ (382) $ 0 $ (382)  
Discontinued Operation, Tax Effect of Discontinued Operation   0   1 0 (3)  
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent   0   (379) 0 (388)  
Proceeds from Divestiture of Businesses and Interests in Affiliates         33 156  
Kazakhstan Hydro [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Pre-tax income of disposed businesses, Excluding gain on disposal, included in continuing operations   15   13 20 18  
Zimmer Station [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Pre-tax income of disposed businesses, Excluding gain on disposal, included in continuing operations   3     2    
Pre-tax loss of disposed businesses, Excluding gain on disposal, included in continuing operations       (10)   (16)  
Proceeds from Divestiture of Businesses and Interests in Affiliates $ 50            
Sul Subsidiary [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Cash Provided by (Used in) Operating Activities, Discontinued Operations         0 57  
Disposal Group, Including Discontinued Operation, Revenue       219   419  
Disposal Group, Including Discontinued Operation, Costs of Goods Sold       (204)   (408)  
Impairment Expense Pre Tax Total       (783)   (783)  
Disposal Group, Including Discontinued Operation, Other Expense       (11)   (20)  
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax       (779)   (792)  
Discontinued Operation, Tax Effect of Discontinued Operation       400   404  
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent   0   $ (379) 0 (388)  
Cash Provided by (Used in) Investing Activities, Discontinued Operations         0 $ (84)  
Sul Subsidiary [Member] | Discontinued Operations [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Disposal Group, Including Discontinued Operation, Assets   0     0   $ 0
Disposal Group, Including Discontinued Operation, Liabilities   0     0   $ 0
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Kazakhstan [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Assets Carrying Amount Disclosure Nonrecurring     $ 171        
Fair Value Less Costs To Sell     29        
Impairment of Long-Lived Assets to be Disposed of     $ 94        
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Kazakhstan Hydro [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Assets Carrying Amount Disclosure Nonrecurring   190     190    
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)   100          
Fair Value Less Costs To Sell   92     $ 92    
Impairment of Long-Lived Assets to be Disposed of   $ 90