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Acquisitions and Divestitures - Divestitures (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jan. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
item
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
item
Divestiture Information            
Number of divested businesses sold or announced to be sold | item           4
Aggregate operating income of divested businesses           $ 20
Disposal Group, Held-for-sale, Not Discontinued Operations            
Divestiture Information            
Disposal - Accounts receivable           25
Disposal - Property, plant and equipment           25
Disposal - Intangible assets           35
Disposal - Deferred revenue           35
Disposal - Goodwill $ 50   $ 50     270
Identity Management Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations            
Divestiture Information            
Annual sales of divested business           $ 205
Safety Prescription Eyewear Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations            
Divestiture Information            
Annual sales of divested business   $ 45        
2017 estimated pre-tax gain on sale       $ 29    
Identity Management and Tolling and Automated License Number Plate Recognition Business in Aggregate | Disposal Group, Disposed of by Sale, Not Discontinued Operations            
Divestiture Information            
Number of businesses sold | item     2      
Proceeds from divested businesses     $ 833      
Proceeds from divested businesses, net of cash sold     809      
Aggregate pre-tax gain on sale     461      
Tolling and Automated License Number Plate Recognition Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations            
Divestiture Information            
Annual sales of divested business 40          
Electronic Monitoring Business | Disposal Group, Held-for-sale, Not Discontinued Operations            
Divestiture Information            
Annual sales of divested business 95          
Aggregate selling price relative to the divestiture transaction $ 200   $ 200      
Electronic Monitoring Business | Disposal Group, Held-for-sale, Not Discontinued Operations | Estimated Financial Impact            
Divestiture Information            
Aggregate pre-tax gain on sale         $ 100