Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value on a recurring basis

The following table presents the Company’s assets and liabilities that are measured at fair value on a recurring basis at March 31, 2013 and 2012:

	At March 31, 2013							At March 31, 2012
	Fair Value Measurement Using Input Types				Estimated Fair Value			Fair Value Measurement Using Input Types				Estimated Fair Value
(in millions)	Level 1		Level 2		Total			Level 1		Level 2		Total
Assets:
Money market funds	$	1,280	$	—	$	1,280	(1)	$	1,374	$	—	$	1,374	(2)
Foreign exchange derivatives (3)	—		1		1			—		2		2
Interest rate derivatives (3)	—		19		19			—		27		27
Total assets	$	1,280	$	20	$	1,300		$	1,374	$	29	$	1,403
Liabilities:
Foreign exchange derivatives (3)	$	—	$	—	$	—		$	—	$	4	$	4
Total liabilities	$	—	$	—	$	—		$	—	$	4	$	4

(1) 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.

(2) At March 31, 2012, the Company had approximately $1,324 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.

(3) See Note 9, “Derivatives” for additional information. Interest rate derivatives fair value excludes accrued interest.

Carrying amounts and estimated fair values of other financial instruments not measured at fair value on a recurring basis

The following table presents the carrying amounts and estimated fair values of the Company’s other financial instruments that are not measured at fair value on a recurring basis at March 31, 2013 and 2012:

	At March 31, 2013				At March 31, 2012
(in millions)	Carrying   Value		Estimated Fair Value		Carrying   Value		Estimated Fair Value
Liabilities:
Total debt (1)	$	1,290	$	1,413	$	1,301	$	1,408
Facilities abandonment reserve (2)	$	23	$	27	$	42	$	48

(1) Estimated fair value of total debt is based on quoted prices for similar liabilities for which significant inputs are observable except for certain long-term lease obligations, for which fair value approximates carrying value (Level 2).

(2) Estimated fair value for the facilities abandonment reserve is determined using the Company’s incremental borrowing rate at March 31, 2013 and 2012. At March 31, 2013 and 2012, the facilities abandonment reserve included approximately $6 million and $16 million, respectively, in “Accrued expenses and other current liabilities” and approximately $17 million and $26 million, respectively, in “Other noncurrent liabilities” in the Company’s Consolidated Balance Sheets (Level 3).