Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common stock:	Additional paid-in capital:	Retained earnings:	Accumulated other comprehensive income (loss):	Treasury stock:
Balance, beginning of period at Dec. 31, 2014		$ 67	$ 1,711	$ 22,156	$ 1,979	$ (7,566)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options			43
Share-based compensation			36
Net earnings	$ 2,533			2,533
Dividends to shareholders ($1.74 per share in 2017, $1.66 per share in 2016 and $1.58 per share in 2015)				(682)
Unrealized foreign currency translation gains (losses) during period, net of income taxes					345
Unrealized gains (losses) on investment securities during the period, net of income taxes and reclassification adjustments					(1,686)
Unrealized gains (losses) on derivatives during period, net of income taxes					0
Pension liability adjustment during period, net of income taxes					(13)
Purchases of treasury stock						(1,315)
Treasury stock reissued			38			62
Balance, end of period at Dec. 31, 2015	17,708	67	1,828	24,007	625	(8,819)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options			46
Share-based compensation			64
Net earnings	2,659			2,659
Dividends to shareholders ($1.74 per share in 2017, $1.66 per share in 2016 and $1.58 per share in 2015)				(685)
Unrealized foreign currency translation gains (losses) during period, net of income taxes					213
Unrealized gains (losses) on investment securities during the period, net of income taxes and reclassification adjustments					1,819
Unrealized gains (losses) on derivatives during period, net of income taxes					2
Pension liability adjustment during period, net of income taxes					(29)
Purchases of treasury stock						(1,422)
Treasury stock reissued			38			69
Balance, end of period at Dec. 31, 2016	20,482	67	1,976	25,981	2,630	(10,172)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options			38
Share-based compensation			51
Net earnings	4,604			4,604
Dividends to shareholders ($1.74 per share in 2017, $1.66 per share in 2016 and $1.58 per share in 2015)				(690)
Unrealized foreign currency translation gains (losses) during period, net of income taxes					233
Unrealized gains (losses) on investment securities during the period, net of income taxes and reclassification adjustments					1,159
Unrealized gains (losses) on derivatives during period, net of income taxes					1
Pension liability adjustment during period, net of income taxes					5
Purchases of treasury stock						(1,391)
Treasury stock reissued			55			51
Balance, end of period at Dec. 31, 2017	$ 24,598	$ 67	$ 2,120	$ 29,895	$ 4,028	$ (11,512)