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Balance Sheet Details (Property And Equipment, Net Schedule) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Property and Equipment, Net [Line Items]          
Depreciation expense $ 30 $ 30 $ 60 $ 59  
Property and equipment, gross 1,376   1,376   $ 1,376
Less: accumulated depreciation (936)   (936)   (923)
Property and equipment, net 440   440   453 [1]
Computer, equipment and software          
Property and Equipment, Net [Line Items]          
Property and equipment, gross 742   742   744
Buildings          
Property and Equipment, Net [Line Items]          
Property and equipment, gross 342   342   336
Leasehold improvements          
Property and Equipment, Net [Line Items]          
Property and equipment, gross 135   135   139
Equipment, furniture and fixtures, and other          
Property and Equipment, Net [Line Items]          
Property and equipment, gross 82   82   84
Land          
Property and Equipment, Net [Line Items]          
Property and equipment, gross 66   66   66
Construction in progress          
Property and Equipment, Net [Line Items]          
Property and equipment, gross $ 9   $ 9   $ 7
[1] Derived from audited Consolidated Financial Statements.