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Equity Equity Transactions with Noncontrolling Interests (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Jun. 30, 2014
Jun. 25, 2014
Dec. 31, 2013
Jun. 30, 2014
Masinloc [Member]
Jul. 15, 2014
Subsequent Event [Member]
Jul. 15, 2014
Subsequent Event [Member]
MW
Jul. 15, 2014
Subsequent Event [Member]
Masinloc [Member]
Jul. 15, 2014
Subsequent Event [Member]
International Finance Corporation [Member]
Jul. 15, 2014
Subsequent Event [Member]
Electricity Generating Public Company Limited [Member]
Noncontrolling Interest [Line Items]                  
Investment In Affiliate Ownership Percentage Sold   45.00%   45.00%          
Divestiture of Business, Purchase Purchase Subject Adjustment   $ 453              
Net proceeds received from sale of businesses         453        
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount           300      
Divestiture of Businesses, Portion Contingent Upon Achievement of Certain Restructuring Efficiencies           23      
Investments in and advances to affiliates $ 1,000   $ 1,010            
Public Utilities, Divestiture of Business, Direct Stake of Coal Fired Power Plant Expansion Project           630      
Public Utilities, Divestiture of Business, Potential Energy Storage Projects in Advanced Development           60      
Noncontrolling Interest, Ownership Percentage by Parent             51.00%    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners               8.00% 41.00%