Fair Value Measurements 2 (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2013	Mar. 31, 2012
Liabilities:
Total debt	$ 1,263		$ 1,766
Facility exit reserve	49		84		39	53
Facility Exit
Liabilities:
Facility exit reserve	21		29		23	40
Carrying Value
Liabilities:
Total debt	1,263	[1]	1,766	[1]
Carrying Value | Facility Exit
Liabilities:
Facility exit reserve	21	[2]	29	[2]
Estimated Fair Value
Liabilities:
Total debt	1,376	[1]	1,884	[1]
Estimated Fair Value | Facility Exit
Liabilities:
Facility exit reserve	$ 23	[2]	$ 33	[2]

[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 facility exit reserve is determined using the Company’s incremental borrowing rate at March 31, 2015 and 2014. At March 31, 2015 and 2014, the facility exit reserve included approximately $4 million and $11 million, respectively, in “Accrued expenses and other current liabilities” and approximately $17 million and $18 million, respectively, in “Other noncurrent liabilities” in the Company’s Consolidated Balance Sheets (Level 3).