Comprehensive Income (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net earnings	$ 1,271	$ 1,277	$ 3,884	$ 3,591
Unrealized holding gains on investment securities arising during the period, net of tax expense of $54, $72, $113 and $154, respectively	98	125	200	273
Reclassification adjustment for net realized gains included in net earnings, net of tax expense of $13, $0, $38 and $19, respectively	(24)	(1)	(68)	(36)
Foreign currency translation (losses) gains	(9)	14	13	1
Comprehensive income	1,336	1,415	4,029	3,829
Unrealized holding gains on investment securities arising during the period, tax expense	54	72	113	154
Reclassification adjustment for net realized gains included in net earnings, tax expense	$ 13	$ 0	$ 38	$ 19