Fair Value Measurements 1 (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Assets:
Foreign exchange derivatives	$ 2	[1]	$ 1	[1]
Interest rate derivatives	8	[1]	19	[1]
Total assets	1,287		1,300
Liabilities:
Foreign exchange derivatives	1	[1]	0	[1]
Total liabilities	1		0
Money Market Funds [Member]
Assets:
Money market funds	1,277	[2]	1,280	[3]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Total assets	1,277		1,280
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member]
Assets:
Money market funds	1,277		1,280
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Foreign exchange derivatives	2	[1]	1	[1]
Interest rate derivatives	8	[1]	19	[1]
Total assets	10		20
Liabilities:
Foreign exchange derivatives	1	[1]	0	[1]
Total liabilities	$ 1		$ 0

[1] See Note 9, “Derivatives” for additional information. Interest rate derivatives fair value excludes accrued interest.

[2] At March 31, 2014, the Company had approximately $1,277 million and less than $1 million of investments in money market funds classified as “Cash and cash equivalents” and “Other noncurrent assets, net” for restricted cash amounts, respectively, in its Consolidated Balance Sheet.

[3] At March 31, 2013, the Company had approximately $1,230 million and $50 million of investments in money market funds classified as “Cash and cash equivalents” and “Other noncurrent assets, net” for restricted cash amounts, respectively, in its Consolidated Balance Sheet.