Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2015	Feb. 04, 2016	Jun. 30, 2015
Entity Registrant Name	MASTERCARD INC
Trading Symbol	MA
Entity Central Index Key	0001141391
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q4
Amendment Flag	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 103.7
Class A Common Stock
Entity Common Stock, Shares Outstanding		1,089,482,218
Class B Common Stock
Entity Common Stock, Shares Outstanding		21,256,530