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Acquisitions - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]          
Acquisitions $ 0   $ 0 $ 42 $ 0
Rabbit Copiers, Inc. and Heritage Business Systems, Inc.          
Business Acquisition [Line Items]          
Acquisitions   $ 38      
Percentage of ownership acquired   100.00%