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Accounting Policies (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Accounting Policies [Abstract]      
Percentage of cash and cash equivalents held by the Company's foreign subsidiaries outside the United States 59.00%    
Accounting Policies [Line Items]      
Payments related to tax withholding for share-based compensation $ 31 $ 30  
Reclass from Operating Activities to Financing Activities      
Accounting Policies [Line Items]      
Payments related to tax withholding for share-based compensation   $ 30  
Other Noncurrent Assets, Net      
Accounting Policies [Line Items]      
Restricted cash $ 3   $ 1