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Leases And Commitments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Rent expense for operating leases   $ 220 $ 209 $ 181
Maximum        
Lessee leasing arrangements, operating leases, term of contract (in years)   20 years    
Minimum        
Warranty period terms minimum 90 days 90 days