Stockholders' Equity (Tables)

6 Months Ended

Mar. 31, 2013

Stockholders' Equity Note [Abstract]

Schedule of Stock by Class

The number of shares of each class and the number of shares of class A common stock on an as-converted basis at March 31, 2013, are as follows:

(in millions, except conversion rate)	Shares Outstanding	Conversion Rate Into Class A Common Stock	As-converted Class A Common Stock(1)
Class A common stock	519	—	519
Class B common stock	245	0.4206	103
Class C common stock	29	1.0000	29
Total			651

⁽¹⁾   Figures in the table may not recalculate exactly due to rounding. As-converted class A common stock is calculated based on whole numbers, not the rounded numbers presented.

Share Repurchase Program Disclosure

The following table presents share repurchases in the open market.

(in millions, except per share data)	Three Months Ended March 31, 2013		Six Months Ended March 31, 2013
Shares repurchased in the open market (1)	12		20
Weighted-average repurchase price per share	$	157.24	$	152.19
Total cost	$	1,820	$	3,073

⁽¹⁾   All shares repurchased in the open market have been retired and constitute authorized but unissued shares.