CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares shares in Millions		Dec. 31, 2018	Sep. 30, 2018
Preferred Stock
Preferred stock, par value		$ 0.0001	$ 0.0001
Preferred stock, shares authorized		25	25
Preferred stock, shares issued		5	5
Preferred stock, shares outstanding		5	5
Series A Preferred Stock
Preferred stock, shares issued		0	0
U.K.& I preferred stock
Preferred stock, shares issued		2	2
Preferred stock, shares outstanding	[1]	2	2
Europe preferred stock
Preferred stock, shares issued		3	3
Preferred stock, shares outstanding	[1]	3	3
Class A common stock
Common stock, par value		$ 0.0001	$ 0.0001
Common stock, shares authorized		2,001,622	2,001,622
Common stock, shares issued		1,754	1,768
Common stock, shares outstanding	[1],[2]	1,754	1,768
Class B common stock
Common stock, par value		$ 0.0001	$ 0.0001
Common stock, shares authorized		622	622
Common stock, shares issued		245	245
Common stock, shares outstanding	[1]	245	245
Class C common stock
Common stock, par value		$ 0.0001	$ 0.0001
Common stock, shares authorized		1,097	1,097
Common stock, shares issued		12	12
Common stock, shares outstanding	[1]	12	12

[1] Figures in the table may not recalculate exactly due to rounding.

[2] Class A common stock shares outstanding reflect repurchases settled on or before December 31, 2018 and September 30, 2018.