CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Net income including non-controlling interest	$ 1,292	$ 880	$ 2,319	$ 1,764
Investment securities, available-for-sale
Net unrealized gain (loss)	6	(1)	7	(3)
Income tax effect	(2)		(2)	1
Defined benefit pension and other postretirement plans	(13)		(8)	2
Income tax effect	2			(1)
Derivative instruments classified as cash flow hedges
Net unrealized loss	(5)	(9)	(12)	(23)
Income tax effect	5	3	6	5
Reclassification adjustment for net (income) loss realized in net income including non-controlling interest	(2)	15	4	27
Income tax effect	1	(3)	1	(7)
Foreign currency translation adjustments	4	6	4	11
Other comprehensive (loss) income, net of tax	(4)	11		12
Comprehensive income including non-controlling interest	1,288	891	2,319	1,776
Comprehensive loss attributable to non-controlling interest		1	2	1
Comprehensive income attributable to Visa Inc.	$ 1,288	$ 892	$ 2,321	$ 1,777