CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Net income including non-controlling interest	$ 1,270	$ 1,292	$ 2,563	$ 2,319
Investment securities, available-for-sale
Net unrealized gain	2	6	50	7
Income tax effect		(2)	(17)	(2)
Reclassification adjustment for net gain realized in net income including non-controlling interest	(1)		(1)	0
Income tax effect
Defined benefit pension and other postretirement plans	2	(13)	5	(8)
Income tax effect	(1)	2	(2)
Derivative instruments classified as cash flow hedges
Net unrealized gain (loss)	6	(5)	15	(12)
Income tax effect		5	0	6
Reclassification adjustment for net (gain) loss realized in net income including non-controlling interest	(6)	(2)	(17)	4
Income tax effect	2	1	5	1
Foreign currency translation adjustments		4		4
Other comprehensive income (loss), net of tax	4	(4)	38
Comprehensive income including non-controlling interest	1,274	1,288	2,601	2,319
Comprehensive loss attributable to non-controlling interest			0	2
Comprehensive income attributable to Visa Inc.	$ 1,274	$ 1,288	$ 2,601	$ 2,321