CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Operating Activities
Net income	$ 1,941	$ 1,569
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of client incentives	788	713
Fair value adjustment for the Visa Europe put option	(255)	0
Share-based compensation	39	45
Excess tax benefit for share-based compensation	(36)	(58)
Depreciation and amortization of property, equipment, technology and intangible assets	120	120
Deferred income taxes	45	97
Other	5	(19)
Change in operating assets and liabilities:
Settlement receivable	(35)	286
Accounts receivable	(75)	(78)
Client incentives	(850)	(687)
Other assets	23	(141)
Accounts payable		(10)
Settlement payable	(36)	(477)
Accrued and other liabilities	317	484
Accrued litigation (Note 13)	(12)	(103)
Net cash provided by operating activities	1,979	1,761
Investing Activities
Purchases of property, equipment, technology and intangible assets	(126)	(104)
Investment securities, available-for-sale:
Purchases	(6,803)	(758)
Proceeds from maturities and sales	739	226
Purchases of / contributions to other investments	(8)
Proceeds / distributions from other investments	4
Net cash used in investing activities	(6,194)	(636)
Financing Activities
Repurchase of class A common stock (Note 9)	(2,015)	(803)
Dividends paid (Note 9)	(340)	(297)
Proceeds from issuance of senior notes (Note 5)	15,971	0
Debt issuance costs (Note 5)	77	0
Payments from litigation escrow account—U.S. retrospective responsibility plan (Note 3 and Note 13)	11	100
Cash proceeds from issuance of common stock under employee equity plans	29	30
Restricted stock and performance-based shares settled in cash for taxes	(81)	(100)
Excess tax benefit for share-based compensation	36	58
Net cash provided by (used in) financing activities	13,534	(1,012)
Effect of exchange rate changes on cash and cash equivalents	0	1
Increase in cash and cash equivalents	9,319	114
Cash and cash equivalents at beginning of year	3,518	1,971
Cash and cash equivalents at end of period	12,837	2,085
Supplemental Disclosure
Income taxes paid, net of refunds	79	57
Accruals related to purchases of property, equipment, technology and intangible assets	$ 40	$ 21