CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Net income including non-controlling interest	$ 2,142	$ 3,646	$ 2,964
Investment securities, available-for-sale
Net unrealized gain (loss)	4	(1)	(10)
Income tax effect	(1)	0	4
Reclassification adjustment for net (gain) loss realized in net income including non-controlling interest	0	(4)	(1)
Income tax effect	0	2	0
Defined benefit pension and other postretirement plans	0	(117)	35
Income tax effect	0	46	(14)
Derivative instruments classified as cash flow hedges
Net unrealized gain (loss)	3	18	(28)
Income tax effect	(1)	(9)	6
Reclassification adjustment for net (gain) loss realized in net income including non-controlling interest	(14)	62	61
Income tax effect	7	(13)	(21)
Foreign currency translation adjustments	7	(9)	5
Other comprehensive income (loss), net of tax	5	(25)	37
Comprehensive income including non-controlling interest	2,147	3,621	3,001
Comprehensive loss attributable to non-controlling interest	2	4	2
Comprehensive income attributable to Visa Inc.	$ 2,149	$ 3,625	$ 3,003