Statement of Other Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Income and Comprehensive Income [Abstract]
Net income	$ 1,250	$ 1,235	$ 3,845	$ 3,743
Other comprehensive income (loss)
Net unrealized securities gains, net of tax	21	113	52	205
Net unrealized derivatives (losses) gains, net of tax	0	(1)	1	6
Foreign currency translation adjustments, net of tax	81	(178)	(46)	(116)
Net unrealized pension and other postretirement benefit gains, net of tax	14	14	34	19
Other comprehensive income (loss)	116	(52)	41	114
Comprehensive income	$ 1,366	$ 1,183	$ 3,886	$ 3,857