Guarantees and Contingent Liabilities - Additional Information (Detail) - USD ($) shares in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Guarantees And Contingent Liabilities (Textual) [Abstract]
Liability related to remaining Visa Litigation, carrying amount	$ 19,000,000	$ 19,000,000
Maximum [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Loss contingency, range of possible loss in excess of any reserves	300,000,000	300,000,000
Merchant Processing [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Value of airline tickets purchased to deliver at future date through card transactions	7,500,000,000	7,500,000,000
Company held collateral in escrow deposits, letters of credit and indemnities from financial institutions and liens on various assets	371,000,000	371,000,000
Liability primarily related to airline processing arrangements	41,000,000	41,000,000
Asset Sales [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Representation and warranty reserve	13,000,000	13,000,000	$ 19,000,000
Unresolved representation and warranty claims from GSEs	$ 12,000,000	$ 12,000,000	$ 7,000,000
Visa Class B Shares [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Number of shares sold	0.4	1.8
Remaining shares held by the Company	3.1	3.1