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Acquisitions (Details) - USD ($)
$ in Millions
1 Months Ended
Nov. 30, 2018
Jan. 31, 2019
Nov. 01, 2018
Oct. 31, 2018
Business Combinations [Abstract]        
Goodwill   $ 6,343 $ 375 $ 5,968
Amortizable intangible assets     300  
Net liabilities assumed     $ (186)  
Total fair value of consideration $ 489