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Significant Accounting Policies 3 (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Accounting Policies [Abstract]      
Percentage of cash and cash equivalents held by the Company's foreign subsidiaries outside the United States 53.00% 60.00%  
Internally developed software costs capitalized $ 0 $ 0 $ 0
Blended federal tax rate 31.55%    
Significant Accounting Policies      
Payments related to tax withholding for share-based compensation $ 36 35 28
ASU 2016-09 | Reclass from Operating Activities to Financing Activities      
Significant Accounting Policies      
Payments related to tax withholding for share-based compensation   35 28
ASU 2014-09 (ASC Topic 606)      
Significant Accounting Policies      
Estimated additional income tax payments per year upon adoption of ASC Topic 606, Gross $ 150    
Period of estimated additional income tax payments upon adoption of ASC Topic 606 4 years    
ASU 2014-09 (ASC Topic 606) | Minimum      
Significant Accounting Policies      
Capitalized contract costs, Amortization period 3 years    
ASU 2014-09 (ASC Topic 606) | Maximum      
Significant Accounting Policies      
Capitalized contract costs, Amortization period 7 years    
ASU 2014-09 (ASC Topic 606) | Tax Cuts and Jobs Act (Tax Act)      
Significant Accounting Policies      
Estimated additional income tax payments per year upon adoption of ASC Topic 606, Net of benefits from Tax Cuts and Jobs Act $ 50    
Period of estimated additional income tax payments upon adoption of ASC Topic 606, Net of benefits from Tax Cuts and Jobs Act 4 years    
Other Noncurrent Assets, Net      
Significant Accounting Policies      
Restricted cash $ 2 1  
Other Expenses, Net      
Significant Accounting Policies      
Foreign currency transaction losses (gains) 27 (2) 26
Other Expenses, Net | Argentina      
Significant Accounting Policies      
Foreign currency transaction losses (gains)     11
Interest Expense, Net      
Significant Accounting Policies      
Interest income 30 28 30
Selling and Marketing      
Significant Accounting Policies      
Advertising expense $ 41 $ 37 $ 35