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Segment Information - Power Segment (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Jul. 04, 2015
USD ($)
MW
Sep. 27, 2014
USD ($)
MW
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jan. 01, 2013
USD ($)
Dec. 31, 2006
USD ($)
Segment Information                
Number of reportable segments | segment       6        
Segment Information                
Gain on sale of assets         $ 5      
Cumulative effect of a change in accounting method           $ 6    
Interest income recorded for interest recognized on certain customer receivable balances       $ 40 $ 14 $ 18    
Dominican Republic                
Segment Information                
Percentage of ownership interest accounted as equity method investment   29.90%            
Amount invested under equity method   $ 10            
Capacity of power facility (in megawatts) | MW   300            
Amount invested under cost method               $ 6
Electricity generating facility | Dominican Republic                
Segment Information                
Amount invested under equity method   $ 10            
Capacity of power facility (in megawatts) | MW   300            
Power | Dominican Republic                
Segment Information                
Percentage of ownership interest accounted as equity method investment 29.90%     29.90%        
Amount invested under cost method   $ 6            
Power | Electricity generating facility | Dominican Republic                
Segment Information                
Amount invested under cost method   $ 6            
Cumulative effect of a change in accounting method             $ 6  
Power | Floating power generating facility | Dominican Republic                
Segment Information                
Capacity of power facility leased (in megawatts) | MW     72          
Gain on sale of assets     $ 5          
Power | Accounts Receivable                
Segment Information                
Interest income recorded for interest recognized on certain customer receivable balances $ 31