Details of Certain Consolidated Statements of Income Lines (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Component of Other Income, Nonoperating [Line Items]
Other revenues	$ 577	$ 534	$ 1,808	$ 1,546
Global Network Services Partner Revenues [Member]
Component of Other Income, Nonoperating [Line Items]
Other revenues	156	157	474	459
Gain (Loss) on Investments [Member]
Component of Other Income, Nonoperating [Line Items]
Other revenues	35	0	84	0
Other revenues [Member]
Component of Other Income, Nonoperating [Line Items]
Other revenues	$ 386	$ 377	$ 1,250	$ 1,087