Statement of Other Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Statement of Income and Comprehensive Income [Abstract]
Net income	$ 1,256	$ 1,177
Other Comprehensive Income
Net unrealized securities gains, net of tax	20	1
Net unrealized derivatives lossess, net of tax	1	4
Foreign currency translation adjustments, net of tax	72	66
Net unrealized pension and other postretirement benefit losses, net of tax	(6)	3
Other comprehensive income	99	68
Comprehensive income	$ 1,355	$ 1,245