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Balance Sheet Details (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Balance Sheet Related Disclosures [Abstract]      
Deferred net revenue (online-enabled games) $ 1,622 $ 1,539  
Depreciation expense $ 120 $ 115 $ 119