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Business Combinations - Deferred Tax Liability (Details) - USD ($)
$ in Millions
Jan. 31, 2021
Dec. 03, 2020
Jul. 31, 2020
Business Acquisition [Line Items]      
Long-term deferred income tax liabilities $ (580)   $ (2)
Credit Karma      
Business Acquisition [Line Items]      
Intangibles   $ (847)  
Federal and state net operating loss carryforwards   135  
Federal research and experimentation credit carryforwards   45  
Other, net   35  
Long-term deferred income tax liabilities   $ (632)