Stockholders Equity (Details Textuals) (USD $) Share data in Millions	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Stockholders' Equity (Textuals) [Abstract]
Weighted average potential anti-dilutive common shares excluded from the calculation of diluted EPS	0.3	4.0
Amount authorized by Board of Directors to repurchase common stock	$ 4,000,000,000
Treasury stock, shares repurchased	3.4
Treasury Stock acquired, Value	180,500,000
Remaining authorized amount in stock repurchase program	450,200,000
Number of shares repurchased to satisfy employee tax withholding obligations	0.4
Amount paid for shares repurchased to satisfy employee tax withholding obligations	$ 21,700,000