Guarantees and Contingent Liabilities - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Airline Processing Arrangements [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Value of airline tickets purchased to deliver at future date through card transactions	$ 9,000	$ 9,000
Representation and Warranty [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Representation and warranty reserve	10	10	$ 10
Unresolved representation and warranty claims from GSEs	11	11	$ 15
Escrow Deposits Letters of Credit Indemnities [Member] | Airline Processing Arrangements [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Company held collateral in escrow deposits, letters of credit and indemnities from financial institutions and liens on various assets	581	581
Merchant Escrow Deposits [Member] | Airline Processing Arrangements [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Company held collateral in escrow deposits, letters of credit and indemnities from financial institutions and liens on various assets	$ 44	$ 44
Visa Class B Shares [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Number of shares sold	0.3	1.0
Remaining shares held by the Company	0.3	0.3