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Discontinued Operations and Held-For-Sale Businesses (Narrative) (Details) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2013
MW
Dec. 31, 2012
Dec. 31, 2011
Nov. 30, 2013
Poland wind projects
project
Nov. 30, 2013
US Wind Projects
project
MW
Sep. 30, 2013
Saurashtra
Oct. 30, 2013
Saurashtra
MW
Sep. 30, 2013
Cameroon
Sep. 30, 2013
Sonel
Sep. 30, 2013
Kribi
Sep. 30, 2013
Dibamba
Apr. 29, 2013
Kiev and Rivne
business
Apr. 29, 2013
Kiev
customer
Apr. 29, 2013
Rivne
customer
Dec. 31, 2012
Tisza I I Subsidiary
MW
Dec. 31, 2011
Tisza I I Subsidiary
Dec. 31, 2010
Tisza I I Subsidiary
Apr. 30, 2012
Red Oak and Ironwood
Apr. 30, 2012
Red Oak
MW
Apr. 30, 2012
Ironwood
MW
Nov. 30, 2011
Argentina Distribution
MW
Nov. 30, 2011
Edelap
customer
Nov. 30, 2011
Edes
customer
Nov. 30, 2011
Edelap and Edes
business
Nov. 30, 2011
Central Dique
Oct. 31, 2011
Brazil Telecom
business
Dec. 31, 2011
Carbon Reduction Projects
Dec. 31, 2011
Wind Projects
Dec. 31, 2012
Eastern Energy Subsidiary
Dec. 31, 2010
Eastern Energy Subsidiary
Mar. 31, 2011
Eastern Energy Subsidiary
MW
plant
Nov. 30, 2011
Borsod
plant
MW
Dec. 31, 2011
Thames
MW
Nov. 30, 2013
Minimum
Poland wind projects
Nov. 30, 2013
Maximum
Poland wind projects
Jan. 30, 2014
Subsequent Event
US Wind Projects
Feb. 24, 2014
Subsequent Event
Saurashtra
Nov. 30, 2013
Armenia Mountain
MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                                                            
Divestiture of ownership in subsidiary percent         100.00%       56.00% 56.00% 56.00%   89.10% 84.60% 100.00%     100.00%           90.00% 51.00% 46.00% 100.00%             61.00% 89.00%      
Number of wind projects       10 3                                                                  
Proceeds from divestiture of business       $ 7,000,000               $ 113,000,000     $ 14,000,000     $ 228,000,000     $ 4,000,000         $ 893,000,000                   $ 27,000,000 $ 8,000,000  
Net gain (loss) from disposal and impairments of discontinued businesses, after income tax (152,000,000) 16,000,000 86,000,000 (2,000,000)                     (87,000,000)     73,000,000     (338,000,000)         446,000,000   (22,000,000) 30,000,000                  
Asset impairment expense 661,000,000 1,940,000,000 366,000,000 65,000,000 47,000,000 12,000,000   63,000,000       38,000,000       52,000,000 85,000,000                   40,000,000     827,000,000                
Production Capacity (MW) 2,465       234   39               900       832 710 68                   1,169 161 208         101
Sale agreement, buyer option to purchase ownership percent                                                                           100.00%
Sale agreement, buyer option to purchase ownership interest, sales price                                                                           75,000,000
Asset impairment charges attributable to noncontrolling interest         7,000,000                                                                  
Assets carrying amount         77,000,000 19,000,000   414,000,000                                     49,000,000                      
Fair value less costs to sell         30,000,000 7,000,000   351,000,000                                                            
Deferred proceeds from divestiture of business                                                                       3,000,000    
Number of power distribution businesses sold                       2                       2                            
Customers served                         881,000 412,000               329,000 172,000                              
Gain (loss) on disposal of discontinued operation from cumulative translation losses                             73,000,000           208,000,000                                  
Number of telecommunication businesses sold                                                   2                        
Assets, fair value                                                     $ 0                      
Number of power plants held for sale                                                             4              
Number of power plants                                                               2