Stockholders' Equity (Tables)

6 Months Ended

Mar. 31, 2017

Stockholders' Equity Note [Abstract]

Schedule of Stock by Class

The number of shares of each series and class and the number of shares of class A common stock on an as-converted basis at March 31, 2017, are as follows:

(in millions, except conversion rates)	Shares Outstanding	Conversion Rate Into Class A Common Stock		As-converted Class A Common Stock(1)
U.K.&I preferred stock	2	13.3880		33
Europe preferred stock	3	13.9480		44
Class A common stock (2)	1,847	—		1,847
Class B common stock	245	1.6483	(3)	405
Class C common stock	14	4.0000		55
Total				2,384

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

⁽²⁾  Class A common stock shares outstanding exclude repurchases traded but not yet settled on or before March 31, 2017.

⁽³⁾  The class B to class A common stock conversion rate is presented on a rounded basis. Conversion calculations for dividend payments are based on a conversion rate rounded to the tenth decimal.

Share Repurchase Program Disclosure

The following table presents share repurchases in the open market.⁽¹⁾ 

(in millions, except per share data)	Three Months Ended March 31, 2017		Six Months Ended March 31, 2017
Shares repurchased in the open market (2)	18		41
Average repurchase price per share (3)	$	88.45	$	83.59
Total cost	$	1,576	$	3,469

⁽¹⁾   Shares repurchased in the open market reflect repurchases settled during the three and six months ended March 31, 2017. These amounts include repurchases traded but not yet settled on or before September 30, 2016 for the six months, or December 31, 2016 for the three months, and exclude repurchases traded but not yet settled on or before March 31, 2017.

⁽²⁾  All shares repurchased in the open market have been retired and constitute authorized but unissued shares.

⁽³⁾  Figures in the table may not recalculate exactly due to rounding. Average repurchase price per share is calculated based on unrounded numbers.

Effect of VE Territory Covered Losses Recovery on the Company Repurchasing its Common Stock

The following table presents as-converted U.K.&I. and Europe preferred stock, after the Company recovered VE territory covered losses through a conversion rate adjustment, for the three and six months ended March 31, 2017.

	Three and Six Months Ended March 31, 2017
(in millions, except per share and conversion rate data)	U.K.&I. Preferred Stock		Europe Preferred Stock
Reduction in equivalent number of shares of class A common stock	1		—		(1)
Effective price per share (2)	$	85.01	$	85.01
Recovery through conversion rate adjustment	$	119	$	1
Conversion rate of preferred stock to class A common stock after adjustment	13.388		13.948
As-converted preferred stock after recovery	33		44

⁽¹⁾  The reduction in equivalent number of shares of class A common stock was less than one million shares.

⁽²⁾  Effective price per share calculated using the volume-weighted average price of the Company's class A common stock over a pricing period in accordance with the Company's current certificates of designations for its series B and C convertible participating preferred stock.