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Land, Buildings, Equipment and Software, Net - Depreciation Expense, Operating Lease Rent Expense, Minimum Operating Lease Commitments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Land, Buildings, Equipment and Software, Net [Abstract]      
Depreciation expense $ 121 $ 125 $ 130
Operating lease rent expense 208 267 299
Capital Leased Property Plant and Equipment Net Book Value   24 32
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Operating Leases, Future Minimum Payments Receivable, Current 153    
Operating Leases, Future Minimum Payments Receivable, in Two Years 113    
Operating Leases, Future Minimum Payments Receivable, in Three Years 78    
Operating Leases, Future Minimum Payments Receivable, in Four Years 53    
Operating Leases, Future Minimum Payments Receivable, in Five Years 33    
Operating Leases, Future Minimum Payments Receivable, Thereafter 76    
Capitalized Computer Software, Additions 47 36 39
capitalized product software $ 8 $ 10 $ 10