CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares shares in Millions	Dec. 31, 2016		Sep. 30, 2016
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, par value	$ 0.0001
Preferred stock, shares issued	0		0
Series B Preferred Stock
Preferred stock, par value	$ 0.0001
Preferred stock, shares issued	2		2
Preferred stock, shares outstanding	2		2
Series C Preferred Stock
Preferred stock, par value	$ 0.0001
Preferred stock, shares issued	3		3
Preferred stock, shares outstanding	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	1,854		1,871
Common stock, shares outstanding	1,854	[1]	1,871
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	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	16		17
Common stock, shares outstanding	16		17

[1] Class A common stock shares outstanding exclude repurchases traded but not yet settled on or before December 31, 2016.