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Discontinued Operations and Held for sale businesses (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2017
Nov. 30, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Mar. 20, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest Prior to Disposal 17.00%          
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax $ (1,486)   $ (1,483)   $ (1,486)  
Cash Provided by (Used in) Operating Activities, Discontinued Operations       $ 168    
Disposal Group, Including Discontinued Operation, Revenue       919    
Disposal Group, Including Discontinued Operation, Costs of Goods Sold       (874)    
Disposal Group, Including Discontinued Operation, Other Expense       (42)    
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax       3    
Income (loss) on discontinued operations, before tax, attributable to Noncontrolling interest       (1)    
Income (loss) from discontinued operations, before income tax, attributable to parent       2    
Discontinued Operation, Tax Effect of Discontinued Operation     0 (2)    
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent     (1) 0    
Disposal Group, Including Discontinued Operation, Assets 2,034   358   2,034  
Disposal Group, Including Discontinued Operation, Liabilities 1,033   63   1,033  
Cash Provided by (Used in) Investing Activities, Discontinued Operations       (127)    
Proceeds from Divestiture of Businesses and Interests in Affiliates     1,180 4    
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal Group, Including Discontinued Operation, Assets 1,948   269   1,948  
Disposal Group, Including Discontinued Operation, Liabilities 1,033   63   1,033  
Masinloc Subsidiary [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from Divestiture of Businesses and Interests in Affiliates     1,050      
Electrica Santiago (Gener ESSA) [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]            
Proceeds from Divestiture of Businesses and Interests in Affiliates         300  
Masinloc Subsidiary [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Noncontrolling Interest, Ownership Percentage by Parent           51.00%
Eletropaulo Subsidiary [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal Group, Including Discontinued Operations, Investments in and Advances to Affiliates 86   89   86  
Deconsolidation, Gain (Loss), Amount   $ (611)        
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)         (455)  
Disposal Group, Including Discontinued Operation, Pension Gains (Losses)         (243)  
Eletropaulo 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 $ 86   89   86  
Kazakhstan [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Impairment of Long-Lived Assets to be Disposed of       94    
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Electrica Santiago (Gener ESSA) [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Assets Carrying Amount Disclosure Nonrecurring     $ 207      
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    
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)         92  
Fair Value Less Costs To Sell       $ 29    
Impairment of Long-Lived Assets to be Disposed of         $ 94