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Land, Buildings, Equipment and Software, Net - Internal Use Software (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant, Equipment and Software [Line Items]      
Product software $ 47 $ 36 $ 39
Internal use software 123 106  
Product software $ 18 $ 22  
Internal Use and Product Software, Useful Lives Minimum 1 year    
Internal Use and Product Software, Useful Lives Maximum 7 years    
Government services [Member]      
Property, Plant, Equipment and Software [Line Items]      
Software Implementation Charge - Cost of Goods Sold     28
Increase (decrease) in restructuring liabilities     $ 9