CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - 3 months ended Dec. 31, 2015 - USD ($) shares in Millions, $ in Millions		Total		Additional Paid-in Capital	Accumulated Income	Accumulated Other Comprehensive Loss	Class A common stock Common Stock	Class B common stock Common Stock	Class C common stock Common Stock
Beginning Balance (in shares) at Sep. 30, 2015							1,950	245	20
Beginning Balance at Sep. 30, 2015		$ 29,842		$ 18,073	$ 11,843	$ (74)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,941	[1]		1,941
Other comprehensive income, net of tax		25				25
Comprehensive income		1,966
Conversion of class C common stock upon sale into public market (in shares)							1		(1)
Issuance and vesting of restricted stock and performance-based shares (in shares)							1
Issuance and vesting of restricted stock and performance-based shares		0
Share-based compensation, net of forfeitures (Note 11) (in shares)	[2]						0
Share-based compensation, net of forfeitures (Note 11)		39		39
Restricted stock and performance-based shares settled in cash for taxes (shares)							(1)
Restricted stock and performance-based shares settled in cash for taxes		(81)		(81)
Excess tax benefit for share-based compensation		36		36
Cash proceeds from issuance of common stock under equity plans (in shares)							1
Cash proceeds from issuance of common stock under employee equity plans		29		29
Cash dividends declared and paid, at a quarterly amount of $0.14 per as-converted share (Note 9)		$ (340)			(340)
Repurchase of class A common stock (Note 9) (in shares)		(26)	[3]				(26)
Repurchase of class A common stock (Note 9)		$ (2,015)		(272)	(1,743)
Ending Balance (in shares) at Dec. 31, 2015							1,926	245	19
Ending Balance at Dec. 31, 2015		$ 29,476		$ 17,824	$ 11,701	$ (49)

[1] Net income is allocated based on proportional ownership on an as-converted basis. The weighted-average number of shares of as-converted class B common stock used in the income allocation was 405 million for the three months ended December 31, 2015 and 2014. The weighted-average number of shares of as-converted class C common stock used in the income allocation was 78 million and 88 million for the three months ended December 31, 2015 and 2014, respectively.

[2] Decrease in class A common stock related to forfeitures of restricted stock awards is less than 1 million shares.

[3] All shares repurchased in the open market have been retired and constitute authorized but unissued shares.