Stockholders' Equity (Tables)

3 Months Ended

Dec. 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 December 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)
UK&I preferred stock	2	12.9660		32
Europe preferred stock	3	13.8930		44
Class A common stock(2)	1,805	—		1,805
Class B common stock	245	1.6483	(3)	405
Class C common stock	12	4.0000		49
Total				2,335

⁽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 December 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 December 31, 2017
Shares repurchased in the open market(2)	16
Average repurchase price per share(3)	$	110.24
Total cost	$	1,778

⁽¹⁾   Shares repurchased in the open market reflect repurchases settled during the three months ended December 31, 2017. These amounts include repurchases traded but not yet settled on or before September 30, 2017 and exclude repurchases traded but not yet settled on or before December 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 UK&I and Europe preferred stock, after the Company recovered VE territory covered losses through conversion rate adjustments, for the three months ended December 31, 2017.

	Three Months Ended December 31, 2017
(in millions, except per share data)	UK&I Preferred Stock		Europe Preferred Stock
Reduction in equivalent number of shares of class A common stock(1)	—		—
Effective price per share(2)	$	111.32	$	111.32
Recovery through conversion rate adjustment	$	31	$	19

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

⁽²⁾  Effective price per share is 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.