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Contingencies and Commitments (Narrative) (Details)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 12, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2010
patent
Payments for legal settlements   $ 54          
Rent expense     $ 138 $ 125 $ 112    
Minimum              
Estimate of possible loss     255        
Maximum              
Estimate of possible loss     $ 400        
Zimmer Product Infringement              
Number of patents allegedly infringed upon | patent             3
Gain contingency, damages awarded, value $ 164         $ 76