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Business Combinations - Consideration Transferred (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2020
Jun. 30, 2020
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Business Acquisition [Line Items]            
Fair value of stock options and restricted stock awards assumed     $ 0 $ 373 $ 6 $ 373
Vlocity            
Business Acquisition [Line Items]            
Cash   $ 1,166        
Fair value of stock options and restricted stock awards assumed   6        
Fair value of pre-existing relationship $ 167 208        
Total   $ 1,380