Visa Funding and Bancorp Cash Payments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2014		Sep. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Visa Funding
Loss Contingencies [Line Items]
Visa deposited into the litigation escrow account	$ 450		$ 150	$ 1,565	$ 400	$ 800	$ 500
Bancorp Cash Payment
Loss Contingencies [Line Items]
Reduction of liability in cash to the swap counterparty	$ 18	[1]	$ 6	$ 75	$ 19	$ 35	$ 20

[1] The settlement of the Bancorp cash payment for the third quarter of 2014 occurred on October 6, 2014.