Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings		$ 713	$ 548	$ 1,305	$ 1,279
Other comprehensive income (loss) before income taxes:
Unrealized foreign currency translation gains (losses) during period		9	899	383	1,588
Unrealized gains (losses) on investment securities:
Unrealized holding gains (losses) on investment securities during period		1,075	2,693	549	5,382
Reclassification adjustment for realized (gains) losses on investment securities included in net earnings		1	11	17	(66)
Unrealized gains (losses) on derivatives during period		(2)	8	1	11
Pension liability adjustment during period		0	(4)	(2)	(6)
Total other comprehensive income (loss) before income taxes		1,083	3,607	948	6,909
Income tax expense (benefit) related to items of other comprehensive income (loss)		314	1,111	177	2,102
Other comprehensive income (loss), net of income taxes	[1]	769	2,496	771	4,807
Total comprehensive income (loss)		$ 1,482	$ 3,044	$ 2,076	$ 6,086

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