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Description of Business and Summary of Significant Accounting Policies - Our Business (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
continent
country
Sep. 30, 2013
Sep. 30, 2014
Segment
continent
country
Sep. 30, 2013
Concentration Risk [Line Items]        
Number of reportable segments     1  
Number of countries in which entity operates 18   18  
Number of continents in which entity operates 4   4  
Revenues from four largest contracts $ 301 $ 349 $ 918 $ 1,185
Increase in operating income due to cumulative catch up adjustments 3 29 30 106
U.S. Army | Revenue | Government Contracts Concentration Risk
       
Concentration Risk [Line Items]        
Concentration percentage     87.00%  
Four Largest Contracts | U.S. Army | Revenue | Government Contracts Concentration Risk
       
Concentration Risk [Line Items]        
Concentration percentage     67.00%  
Revenues from four largest contracts     619  
Contracts Accounted for under Percentage of Completion
       
Concentration Risk [Line Items]        
Increase in operating income due to cumulative catch up adjustments   $ 5   $ 39