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Leases And Commitments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Rent expense for operating leases $ 249 $ 220 $ 209
Maximum      
Lessee leasing arrangements, operating leases, term of contract (in years) 20 years    
Minimum      
Warranty period terms minimum 90 days