Stockholders' Equity (Tables)

6 Months Ended

Mar. 31, 2020

Stockholders' Equity Note [Abstract]

Schedule of Stock by Class

As-converted class A common stock. The following table presents the number of shares of each series and class of stock and the number of shares of class A common stock on an as-converted basis:

	March 31, 2020				September 30, 2019
	Shares Outstanding	Conversion Rate Into  Class A Common Stock		As-converted Class A Common Stock(1)	Shares Outstanding	Conversion Rate Into Class A Common Stock		As-converted Class A Common Stock(1)
	(in millions, except conversion rates)
UK&I preferred stock	2	12.9360		32	2	12.9360		32
Europe preferred stock	3	13.8840		44	3	13.8840		44
Class A common stock(2)	1,693	—		1,693	1,718	—		1,718
Class B common stock	245	1.6228	(3)	398	245	1.6228	(3)	398
Class C common stock	11	4.0000		43	11	4.0000		45
Total				2,210				2,237

⁽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 reflect repurchases that settled on or before March 31, 2020 and September 30, 2019.

⁽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

Common stock repurchases. The following table presents share repurchases in the open market for the following periods:

	Three Months Ended March 31,				Six Months Ended March 31,
	2020		2019		2020		2019
	(in millions, except per share data)
Shares repurchased in the open market(1)	18		14		31		31
Average repurchase price per share(2)	$	181.11	$	144.94	$	180.31	$	141.08
Total cost(2)	$	3,133	$	1,938	$	5,503	$	4,331

⁽¹⁾   Shares repurchased in the open market reflect repurchases that settled during the three and six months ended March 31, 2020 and 2019. All shares repurchased in the open market have been retired and constitute authorized but unissued shares.

⁽²⁾ 

Figures in the table may not recalculate exactly due to rounding. Average repurchase price per share and total cost is calculated based on unrounded numbers.