XML 29 R73.htm IDEA: XBRL DOCUMENT v2.4.0.8
Variable Interest Entities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
CMS 3 [Member]
Jun. 30, 2014
CMS 3 [Member]
Mar. 31, 2014
CMS 3 [Member]
Nevada [Member]
MW
May 31, 2014
CCH [Member]
MW
Jun. 30, 2014
CCH [Member]
Variable Interest Entity [Line Items]              
Percentage of variable interests     50.00%        
Solar energy project, capacity         250 110  
Investments (including earnings)       $ 123     $ 85
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       45  
Gain on sale, net of tax           $ 26