Fair Value Measurements 2 (Details) - USD ($) $ in Millions		Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Liabilities:
Total debt		$ 2,791	$ 1,953
Facility exit reserve		12	19	$ 49	$ 84
Facility Exit
Liabilities:
Facility exit reserve		11	16	$ 21	$ 29
Carrying Value
Liabilities:
Total debt		2,791	1,953
Carrying Value | Facility Exit
Liabilities:
Facility exit reserve	[1]	11	16
Estimated Fair Value
Liabilities:
Total debt	[2]	2,903	2,058
Estimated Fair Value | Facility Exit
Liabilities:
Facility exit reserve	[1]	$ 12	$ 17

[1] Estimated fair value for the facility exit reserve is determined using the Company’s incremental borrowing rate at March 31, 2017 and 2016. At March 31, 2017 and 2016, the facility exit reserve included approximately $3 million and $4 million, respectively, in “Accrued expenses and other current liabilities” and approximately $8 million and $12 million, respectively, in “Other noncurrent liabilities” in the Company’s Consolidated Balance Sheets (Level 3).

[2] 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).