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Variable Interest Entities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Sep. 30, 2014
Mar. 31, 2014
CMS 3 [Member]
Sep. 30, 2014
CMS 3 [Member]
Mar. 31, 2014
CMS 3 [Member]
Nevada [Member]
MW
May 31, 2014
CCH [Member]
MW
Sep. 30, 2014
CCH [Member]
Aug. 31, 2014
OCI Solar San Antonio [Member]
MW
Sep. 30, 2014
OCI Solar San Antonio [Member]
Sep. 30, 2014
OCI Solar San Antonio [Member]
Noncontrolling Interest [Member]
Variable Interest Entity [Line Items]                  
Percentage of membership interest   50.00%         80.00%    
Solar energy project, capacity       250 110   40    
Investments (including earnings)     $ 155     $ 82      
Percentage of variable interests sold         50.00%        
Remaining percentage of variable interests         50.00%        
Net proceeds on sale 108       108        
Gain on sale, pretax 45       45        
Gain on sale, net of tax         26        
Purchase of membership interest, amount             49    
Net assets               58  
Non controlling interest of third party               $ 78 $ 9