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Joint Venture (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 69 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]            
Capital contribution     $ 163 $ 268    
VCE Company LLC
           
Schedule of Equity Method Investments [Line Items]            
Capital contribution         1,341  
Accumulated stock-based compensation contributed to joint venture         17  
Percentage of outstanding equity owned 58.00%   58.00%   58.00%  
Consolidated share of losses based on overall funding, percentage 65.00% 63.00% 64.00% 63.00%    
Loss From VCE 101 75 261 215 1,057  
Revenue recognized from sales to VCE 207 131 550 307    
Receivable from joint venture $ 65   $ 65   $ 65 $ 52