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Acquisition (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jul. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill $ 294   $ 289
Little Bird HR, Inc.      
Business Acquisition [Line Items]      
Accounts receivable   $ 2  
Customer list intangible   8  
Goodwill   $ 5