Stockholders' Equity and Per Share Data (Narrative) (Details) - $ / shares	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Capital stock authorized (in shares)	10,020,000,000
Common shares, shares authorized (in shares)	9,000,000,000	9,000,000,000
Common stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	20,000,000
Preferred stock, par value	$ 0.0001
Common stock, shares, outstanding (in shares)	4,000,000,000
Class of Warrant or Right, Unissued	62,000,000
Number of stock that will be issued shares warrant (in shares)	55,000,000
Class of warrant or right, exercise price of warrants or rights	$ 5.25
Series 1 Voting [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Common shares, shares authorized (in shares)	9,000,000,000
Common stock, par value	$ 0.01
Non Voting [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Common shares, shares authorized (in shares)	1,000,000,000
Common stock, par value	$ 0.01
Options and RSUs [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Number of shares that had no effect on computation of dilutive weighted average number of shares outstanding (in shares)	114,000,000	73,000,000	56,000,000