Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings		$ 716	$ 629	$ 2,021	$ 1,908
Other comprehensive income (loss) before income taxes:
Unrealized foreign currency translation gains (losses) during period		(58)	195	325	1,783
Unrealized gains (losses) on investment securities:
Unrealized holding gains (losses) on investment securities during period		457	(527)	1,006	4,855
Reclassification adjustment for realized (gains) losses on investment securities included in net earnings		(50)	33	(33)	(33)
Unrealized gains (losses) on derivatives during period		(1)	0	0	11
Pension liability adjustment during period		1	0	(1)	(6)
Total other comprehensive income (loss) before income taxes		349	(299)	1,297	6,610
Income tax expense (benefit) related to items of other comprehensive income (loss)		219	(231)	396	1,871
Other comprehensive income (loss), net of income taxes	[1]	130	(68)	901	4,739
Total comprehensive income (loss)		$ 846	$ 561	$ 2,922	$ 6,647

[1] All amounts in the table above are net of tax.