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Legal Proceedings - Additional Information (Detail)
$ in Millions
1 Months Ended 3 Months Ended
Jun. 30, 2014
plaintiff
May. 31, 2014
plaintiff
Apr. 01, 2016
USD ($)
Apr. 30, 2012
LegalMatter
executive
Jul. 31, 2013
USD ($)
Nov. 30, 2008
USD ($)
Securities Class Actions            
Legal Proceedings [Line Items]            
Number of lawsuits | LegalMatter       3    
Number of lawsuits, withdrawn | LegalMatter       1    
Number of lawsuits, consolidated | LegalMatter       2    
Number of former Chief Executive Officers | executive       2    
Greek Government Contract            
Legal Proceedings [Line Items]            
Arbitral award     $ 22   $ 44  
Recorded losses     123      
Accounts and Notes Receivable, Net     2      
Greek Government Contract | Invoice for Undisputed Portion of Contract            
Legal Proceedings [Line Items]            
Contracts receivable           $ 16
Greek Government Contract | Value Added Taxes            
Legal Proceedings [Line Items]            
Contracts receivable     29      
Greek Government Contract | Letters of Credit Relating to Delivery            
Legal Proceedings [Line Items]            
Letter of credit available to the company     17      
Greek Government Contract | Standby Letters of Credit            
Legal Proceedings [Line Items]            
Letter of credit available to the company     18      
Greek Government Contract | Letters Of Credit Related System Support And Maintenance | Letters of Credit Relating to Delivery            
Legal Proceedings [Line Items]            
Amount outstanding     $ 4      
Data Privacy Litigation            
Legal Proceedings [Line Items]            
Number of plaintiffs | plaintiff 2 2