Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net earnings	$ 702		$ 1,017	$ 2,483		$ 2,285
Other comprehensive income (loss) before income taxes:
Unrealized foreign currency translation gains (losses) during period	5		76	(373)		8
Unrealized gains (losses) on investment securities:
Unrealized holding gains (losses) on investment securities during period	255		1,430	(3,553)		1,435
Reclassification adjustment for realized (gains) losses on investment securities included in net earnings	(94)		(213)	(220)		284
Unrealized gains (losses) on derivatives during period	2		2	(5)		(6)
Pension liability adjustment during period	0		(33)	8		(30)
Total other comprehensive income (loss) before income taxes	168		1,262	(4,143)		1,691
Income tax expense (benefit) related to items of other comprehensive income (loss)	(211)		347	(967)		569
Other comprehensive income (loss), net of income taxes	379	[1]	915	(3,176)	[1]	1,122
Total comprehensive income (loss)	$ 1,081		$ 1,932	$ (693)		$ 3,407

[1] All amounts in the table above are net of tax. Amounts in parentheses indicate debits.