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Goodwill and Intangible Assets (Schedule of Changes in the Carrying Amount of Goodwill) (Details)
$ in Millions
9 Months Ended
Dec. 29, 2017
USD ($)
Goodwill [Roll Forward]  
March 31, 2017 $ 8,627 [1]
Acquisitions 295
Divestiture (606)
Translation and other adjustments 2
December 29, 2017 8,318
Enterprise Security  
Goodwill [Roll Forward]  
March 31, 2017 6,078
Acquisitions 256
Divestiture (606)
Translation and other adjustments 5
December 29, 2017 5,733
Consumer Digital Safety  
Goodwill [Roll Forward]  
March 31, 2017 2,549
Acquisitions 39
Divestiture 0
Translation and other adjustments (3)
December 29, 2017 $ 2,585
[1] Derived from audited financial statements.