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Joint Ventures (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended 66 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
VCE Company LLC
Sep. 30, 2012
VCE Company LLC
Sep. 30, 2013
VCE Company LLC
Sep. 30, 2012
VCE Company LLC
Jun. 30, 2013
VCE Company LLC
Sep. 30, 2013
Other Assets, Net
VCE Company LLC
Dec. 31, 2012
Other Assets, Net
VCE Company LLC
Schedule of Equity Method Investments [Line Items]                  
Accumulated stock-based compensation contributed to joint venture             $ 16    
Consolidated ownership perentage of outstanding equity     58.00%   58.00%        
Capital contribution 268 218         976    
Consolidated share of losses         63.00%        
Loss From VCE     75 62 215 177 713    
Revenue recognized from sales to VCE     131 65 307 211      
Receivable from joint venture               $ 47 $ 44