Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 2,659	$ 2,533	$ 2,951
Other comprehensive income (loss) before income taxes:
Unrealized foreign currency translation gains (losses) during period	283	360	(1,455)
Unrealized gains (losses) on investment securities:
Unrealized holding gains (losses) on investment securities during period	2,852	(2,534)	5,947
Reclassification adjustment for realized (gains) losses on investment securities included in net earnings	(53)	(61)	(54)
Unrealized gains (losses) on derivatives during period	3	0	(17)
Pension liability adjustment during period	(45)	(20)	(76)
Total other comprehensive income (loss) before income taxes	3,040	(2,255)	4,345
Income tax expense (benefit) related to items of other comprehensive income (loss)	1,035	(901)	1,803
Other comprehensive income (loss), net of income taxes	2,005	(1,354)	2,542
Total comprehensive income (loss)	$ 4,664	$ 1,179	$ 5,493