Significant Accounting Policies 3 (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Accounting Policies [Abstract]
Percentage of cash and cash equivalents held by the Company's foreign subsidiaries outside the United States	60.00%	76.00%
Payments related to tax withholding for share-based compensation	$ 35	$ 28	$ 27
Other Expenses, Net
Significant Accounting Policies
Foreign currency transaction (gains) losses	(2)	26	(14)
Other Expenses, Net | Argentina
Significant Accounting Policies
Foreign currency transaction (gains) losses		11
Other Expenses, Net | Venezuela
Significant Accounting Policies
Foreign currency transaction (gains) losses			14
Interest Expense, Net
Significant Accounting Policies
Interest income	28	30	30
Selling and Marketing
Significant Accounting Policies
Advertising expense	$ 37	$ 35	$ 39