Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014
Receivables, allowances	$ 141	$ 186
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10	10
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000	1,000
Common stock, shares issued	312	311
Common stock, shares outstanding	312	311