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Restructuring and Asset Impairment Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Net current period restructuring charges, continuing operations $ 78 $ 92 $ 73
Restructuring reserve [Roll Forward]      
Balance at beginning of period 44 21  
Restructuring provision 78 103  
Reversals of prior accruals 0 (11)  
Total Net Current Period Charges 78 92  
restructuring cash payments charged against the reserve (75) (65)  
Balance at end of period 49 44 21
Strategic transformation costs 3 9 28
Other Restructuring Costs 2 (4)  
Commercial Industries [Member]      
Restructuring Cost and Reserve [Line Items]      
Net current period restructuring charges, continuing operations 26 15 27
Government services [Member]      
Restructuring Cost and Reserve [Line Items]      
Net current period restructuring charges, continuing operations 1 2 3
Transportation Services [Member]      
Restructuring Cost and Reserve [Line Items]      
Net current period restructuring charges, continuing operations 3 1 2
All Other Segments [Member]      
Restructuring Cost and Reserve [Line Items]      
Net current period restructuring charges, continuing operations 6 4 17
Corporate, Non-Segment [Member]      
Restructuring Cost and Reserve [Line Items]      
Net current period restructuring charges, continuing operations 42 70 24
Employee Severance [Member]      
Restructuring reserve [Roll Forward]      
Balance at beginning of period 14 15  
Restructuring provision 39 49  
Reversals of prior accruals (5) (8)  
Total Net Current Period Charges 34 41  
restructuring cash payments charged against the reserve (35) (42)  
Balance at end of period 13 14 15
Other Restructuring Costs 0 0  
Lease Cancellation and Other Costs [Member]      
Restructuring reserve [Roll Forward]      
Balance at beginning of period 30 6  
Restructuring provision 39 54  
Reversals of prior accruals 5 (3)  
Total Net Current Period Charges 44 51  
restructuring cash payments charged against the reserve (40) (23)  
Balance at end of period 36 30 $ 6
Other Restructuring Costs $ 2 $ (4)