Guarantees and Contingent Liabilities - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Guarantees And Contingent Liabilities (Textual) [Abstract]
Liability related to remaining Visa Litigation, carrying amount	$ 19	$ 19
Representation and warranty reserve	40	40	$ 46	$ 46	$ 69	$ 75	$ 83
Merchant Processing [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Value of airline tickets purchased to deliver at future date	9,700	9,700
Company held collateral in escrow deposits, letters of credit and indemnities from financial institutions and liens on various assets	481	481
Asset Sales [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Representation and warranty reserve	40	40		46
Unresolved representation and warranty claims	$ 21	$ 21		$ 19
Visa Class B [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Number of shares sold	0.4	0.8
Remaining shares held by the Company	8.1	8.1