Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net earnings	$ 2,866	$ 1,937	$ 2,328
Other comprehensive income (loss) before income taxes:
Unrealized foreign currency translation gains (losses) during period	(287)	(18)	90
Unrealized gains (losses) on investment securities:
Unrealized holding gains (losses) on investment securities during period	1,660	566	370
Reclassification adjustment for realized (gains) losses on investment securities included in net earnings	497	1,154	421
Unrealized gains (losses) on derivatives during period	(22)	(33)	51
Pension liability adjustment during period	(20)	(65)	(32)
Total other comprehensive income (loss) before income taxes	1,828	1,604	900
Income tax expense (benefit) related to items of other comprehensive income (loss)	1,078	392	(32)
Other comprehensive income (loss), net of income taxes	750	1,212	932
Total comprehensive income (loss)	$ 3,616	$ 3,149	$ 3,260