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Discontinued Operations and Held-For-Sale Businesses (Narrative) (Details) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2016
Mar. 31, 2015
Dec. 31, 2017
Nov. 30, 2017
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 after Disposal     17.00%            
Cash Provided by (Used in) Operating Activities, Discontinued Operations             $ 164,000,000 $ 529,000,000 $ (125,000,000)
Cash Provided by (Used in) Investing Activities, Discontinued Operations             (288,000,000) (368,000,000) (65,000,000)
Disposal Group, Including Discontinued Operation, Revenue             3,320,000,000 4,036,000,000 4,430,000,000
Disposal Group, Including Discontinued Operation, Costs of Goods Sold             3,151,000,000 3,954,000,000 4,227,000,000
Asset Impairment Charges             537,000,000 1,098,000,000 602,000,000
Net loss from disposal and impairments of discontinued operations             611,000,000 1,119,000,000 0
Other Asset Impairment Charges             537,000,000 1,096,000,000 285,000,000
Income (Loss) from Continuing Operations Attributable to Parent             (507,000,000) (20,000,000) 318,000,000
Impairment Expense Pre Tax Total             (611,000,000) (1,385,000,000) 0
Disposal Group, Including Discontinued Operation, Other Expense             (166,000,000) (160,000,000) (70,000,000)
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax             3,000,000 (78,000,000) 133,000,000
Disposal Group, Including Discontinued Operation, Assets, Noncurrent     $ 0       0 3,343,000,000  
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax             (608,000,000) (1,463,000,000) 133,000,000
Income (loss) on discontinued operations, before tax, attributable to Noncontrolling interest             (25,000,000) (142,000,000) (92,000,000)
Income (loss) from discontinued operations, before income tax, attributable to parent             (633,000,000) (1,605,000,000) 41,000,000
Disposal Group, Including Discontinued Operation, Liabilities               94,000,000  
Discontinued Operation, Tax Effect of Discontinued Operation             (21,000,000) 495,000,000 (53,000,000)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent             (654,000,000) (1,110,000,000) (12,000,000)
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Armenia Mountain                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Sale Agreement, Buyer Option To Purchase Ownership Interest, Sales Price   $ 75,000,000              
Eletropaulo Subsidiary [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Deconsolidation, Gain (Loss), Amount       $ 611,000,000          
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents     0       0 61,000,000  
Disposal Group, Including Discontinued Operation, Accrued Liabilities     0       0 954,000,000  
Disposal Group, Including Discontinued Operation, Deferred Tax Assets     0       0 554,000,000  
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)             (455,000,000)    
Disposal Group, Including Discontinued Operation, Pension Gains (Losses)             (243,000,000)    
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax             (633,000,000) (192,000,000) 73,000,000
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net     0       0 745,000,000  
Disposal Group, Including Discontinued Operation, Other Assets, Current     0       0 499,000,000  
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment     0       0 2,504,000,000  
Disposal Group, Including Discontinued Operation, Other Assets     0       0 305,000,000  
Disposal Group, Including Discontinued Operation, Accounts Payable     0       0 418,000,000  
Debt excluded from non-recourse debt and included in current and noncurrent liabilities of held for sale and discontinued businesses     0       0 1,009,000,000  
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation, Noncurrent     0       0 1,159,000,000  
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent     0       0 678,000,000  
Disposal Group, Including Discontinued Operation, Other Liabilities     $ 0       $ 0 31,000,000  
Sul Subsidiary [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Net loss from disposal and impairments of discontinued operations $ 737,000,000       $ 382,000,000     1,119,000,000  
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)               (1,000,000,000)  
Reduction in Stockholders equity due to sale of business               92,000,000  
Impairment Expense Pre Tax Total           $ 602,000,000      
Discontinued Operation, Tax (Expense) Benefit from Provision for (Gain) Loss on Disposal         266,000,000        
Disposal Group, Including Discontinued Operation, Assets, Noncurrent         1,600,000,000 $ 1,600,000,000      
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax               $ (1,413,000,000) $ (32,000,000)
Sul Subsidiary [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Discontinued Operation, Tax (Expense) Benefit from Provision for (Gain) Loss on Disposal         $ 135,000,000        
Proceeds from Divestiture of Businesses, Net of Cash Divested $ 484,000,000