Details of Certain Consolidated Statements of Income Lines (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Component of Operating Other Cost and Expense [Line Items]
Total marketing, promotion, rewards and cardmember services	$ 2,580	$ 2,415	$ 4,910	$ 4,707
Marketing and promotion [Member]
Component of Operating Other Cost and Expense [Line Items]
Total marketing, promotion, rewards and cardmember services	786	773	1,407	1,404
Cardmember rewards [Member]
Component of Operating Other Cost and Expense [Line Items]
Total marketing, promotion, rewards and cardmember services	1,601	1,462	3,121	2,929
Cardmember services [Member]
Component of Operating Other Cost and Expense [Line Items]
Total marketing, promotion, rewards and cardmember services	$ 193	$ 180	$ 382	$ 374