Fair Value Measurements and Investments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2016	Jun. 21, 2016	Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-cash decrease in the fair value of the put	$ (255,000,000)
Non-marketable equity investments			$ 45,000,000		$ 45,000,000
Carrying value of cost method investments, reclassified as available for sale			4,000,000
Fair value of available for sale securities previously classified as cost method investments			38,000,000
Pre-tax unrealized gain on available-for-sale securities, previously classified as cost method investments			34,000,000
Principal Amount			16,000,000,000
Long-term Debt			15,879,000,000		0
Long-term Debt, Fair Value			0
Available-for-sale securities, gross unrealized gains			46,000,000		7,000,000
Available-for-sale securities, gross unrealized losses			$ 1,000,000		$ 0
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, stated maturities			1 year
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, stated maturities			2 years
Senior Notes | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt maturity period			2 years
Senior Notes | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt maturity period			30 years
Senior Notes | 2017 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal Amount			$ 1,750,000,000
Long-term Debt			1,746,000,000
Long-term Debt, Fair Value			0
Senior Notes | 2020 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal Amount			3,000,000,000
Long-term Debt			2,987,000,000
Long-term Debt, Fair Value			0
Senior Notes | 2022 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal Amount			2,250,000,000
Long-term Debt			2,237,000,000
Long-term Debt, Fair Value			0
Senior Notes | 2025 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal Amount			4,000,000,000
Long-term Debt			3,963,000,000
Long-term Debt, Fair Value			0
Senior Notes | 2035 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal Amount			1,500,000,000
Long-term Debt			1,485,000,000
Long-term Debt, Fair Value			0
Senior Notes | 2045 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal Amount			3,500,000,000
Long-term Debt			3,461,000,000
Long-term Debt, Fair Value			$ 0
Visa Europe put option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-cash decrease in the fair value of the put	255,000,000	$ 110,000,000
Level 3 | Visa Europe put option | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-cash decrease in the fair value of the put	$ 255,000,000
Visa Europe
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Share capital of Visa Europe acquired (percent)				100.00%