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Joint Ventures (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 78 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]            
Capital contribution     $ 63 $ 158    
VCE Company LLC
           
Schedule of Equity Method Investments [Line Items]            
Accumulated stock-based compensation contributed to joint venture         17  
Consolidated ownership perentage of outstanding equity 58.00%   58.00%   58.00%  
Capital contribution         1,255  
Consolidated share of losses 63.00% 63.00% 63.00% 63.00%    
Loss From VCE 85 71 160 140 956  
Revenue recognized from sales to VCE 172 102 342 176    
Receivable from joint venture $ 60   $ 60   $ 60 $ 52