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Balance Sheet Details (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Balance Sheet Related Disclosures [Abstract]      
Deferred net revenue (online-enabled games) $ 1,539 $ 1,458  
Depreciation expense $ 115 $ 119 $ 126