Visa Europe - Pro Forma Information (Details) - USD ($)		3 Months Ended			9 Months Ended
		Jun. 30, 2017	Jun. 30, 2016		Jun. 30, 2017	Jun. 30, 2016		Sep. 30, 2014
Business Acquisition [Line Items]
Net operating revenues		$ 4,565,000,000	$ 3,630,000,000	[1]	$ 13,503,000,000	$ 10,821,000,000	[1]
Net income		2,059,000,000	412,000,000	[1]	4,559,000,000	4,060,000,000	[1]
Revaluation of the Visa Europe put option						255,000,000
Loss on Contract Termination		$ 0	1,877,000,000	[1]	$ 0	1,877,000,000	[1]
Foreign Currency Transaction Gain, before Tax			145,000,000
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net			42,000,000			74,000,000
Fair value of the Visa Europe put option liability								$ 0
Visa Europe
Business Acquisition [Line Items]
Net operating revenues (pro forma)			3,930,000,000			11,829,000,000
Net income (pro forma)			1,686,000,000			5,141,000,000
Senior Notes | Visa Europe
Business Acquisition [Line Items]
Debt issued			$ 16,000,000,000			$ 16,000,000,000
Class A common stock
Business Acquisition [Line Items]
Diluted earnings per share (in dollars per share)	[2]	$ 0.86	$ 0.17	[1],[3]	$ 1.90	$ 1.69	[1],[3]
Class A common stock | Visa Europe
Business Acquisition [Line Items]
Diluted earnings per share (in dollars per share) (Pro forma)			$ 0.68			$ 2.07
Operating Expense
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs						$ 152,000,000

[1] The Company did not include Visa Europe's financial results in the Company's unaudited consolidated statements of operations from the acquisition date, June 21, 2016, through June 30, 2016 as the impact was immaterial. The dilutive impact of the outstanding shares of series B and C convertible participating preferred stock from June 21, 2016 through June 30, 2016 was also not included in the calculation of basic or diluted earnings per share as the effect was immaterial. See Note 2—Visa Europe and Note 10—Earnings Per Share to these unaudited consolidated financial statements.

[2] Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.

[3] The Company did not include Visa Europe's financial results in the Company's unaudited consolidated statements of operations from the acquisition date, June 21, 2016, through June 30, 2016 as the impact was immaterial. The dilutive impact of the U.K.&I and Europe preferred stock from June 21, 2016 through June 30, 2016 was also not included in the calculation of basic or diluted earnings per share as the effect was immaterial.