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Subsequent Events (Details) - Subsequent Event - USD ($)
$ in Millions
Aug. 06, 2019
Aug. 08, 2019
Subsequent Event [Line Items]    
Share repurchase authorization $ 1,600  
Enterprise Security | Discontinued Operations, Disposed of by Sale    
Subsequent Event [Line Items]    
Disposal Group, Including Discontinued Operation, Consideration   $ 10,700
Fiscal 2020 Plan    
Subsequent Event [Line Items]    
Expected number of positions eliminated, percent 7.00%  
Expected cost $ 100  
Fiscal 2020 Plan | Employee Severance    
Subsequent Event [Line Items]    
Expected cost 75  
Fiscal 2020 Plan | Site closures    
Subsequent Event [Line Items]    
Expected cost $ 25  
Minimum | Enterprise Security | Discontinued Operations, Disposed of by Sale    
Subsequent Event [Line Items]    
Disposal Group, Including Discontinued Operation, Accrued Income Tax Payable   2,300
Maximum | Enterprise Security | Discontinued Operations, Disposed of by Sale | U.S. and Foreign Tax Authority    
Subsequent Event [Line Items]    
Disposal Group, Including Discontinued Operation, Accrued Income Tax Payable   $ 2,700