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Equity Equity Transactions with Noncontrolling Interests (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Dominican Republic [Member]
Jul. 15, 2014
Masinloc Subsidiary [Member]
Jul. 15, 2014
Masinloc Subsidiary [Member]
Jun. 25, 2014
Masinloc Subsidiary [Member]
Jul. 15, 2014
Masinloc Subsidiary [Member]
International Finance Corporation [Member]
Jul. 15, 2014
Masinloc Subsidiary [Member]
Electricity Generating Public Company Limited [Member]
Sep. 30, 2014
Masinloc Subsidiary [Member]
Sep. 30, 2014
Acquire addition shares through December 31, 2015 [Member]
Sep. 30, 2014
Acquire additional shares through December 31, 2016 [Member]
Noncontrolling Interest [Line Items]                          
Investment In Affiliate Ownership Percentage Sold               45.00%          
Divestiture of Business, Purchase Purchase Subject Adjustment               $ 453          
Net proceeds received from sale of businesses         96 443              
Divestiture of Businesses, Portion Contingent Upon Achievement of Certain Restructuring Efficiencies             23            
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal                     283    
Investments in and advances to affiliates 704 704   1,010                  
Noncontrolling Interest, Ownership Percentage by Parent             51.00%            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners         8.00%       8.00% 41.00%      
Sale of subsidiary shares to noncontrolling interests $ 130 $ 130 $ 83                    
Investment Options, Exercise Price         $ 24               $ 125
Investment Options, acquisition percentage                       2.00% 10.00%