Fair Value Measurements 1 (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions		Sep. 30, 2015	Mar. 31, 2015
Assets:
Foreign exchange derivatives	[1]	$ 19	$ 5
Total assets		338	754
Liabilities:
Foreign exchange derivatives	[1]	12	3
Total liabilities		12	3
Money Market Funds | Cash and Cash Equivalents
Assets:
Money market funds	[2]	319	749
Fair Value, Inputs, Level 1
Assets:
Foreign exchange derivatives	[1]	0	0
Total assets		319	749
Liabilities:
Foreign exchange derivatives	[1]	0	0
Total liabilities		0	0
Fair Value, Inputs, Level 1 | Money Market Funds | Cash and Cash Equivalents
Assets:
Money market funds	[2]	319	749
Fair Value, Inputs, Level 2
Assets:
Foreign exchange derivatives	[1]	19	5
Total assets		19	5
Liabilities:
Foreign exchange derivatives	[1]	12	3
Total liabilities		12	3
Fair Value, Inputs, Level 2 | Money Market Funds | Cash and Cash Equivalents
Assets:
Money market funds	[2]	0	0
Fair Value, Inputs, Level 3
Assets:
Total assets		0	0
Liabilities:
Total liabilities		$ 0	$ 0

[1] See Note I, “Derivatives” for additional information.

[2] The Company’s investments in money market funds are classified as “Cash and cash equivalents” in its Condensed Consolidated Balance Sheets.