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, 2015		$ 67	$ 1,828	$ 24,007	$ 625	$ (8,819)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options			10
Share-based compensation			21
Net earnings	$ 731			731
Dividends to shareholders				(173)
Unrealized foreign currency translation gains (losses) during period, net of income taxes					612
Unrealized gains (losses) on investment securities during period, net of income taxes and reclassification adjustments					1,698
Unrealized gains (losses) on derivatives during period, net of income taxes					2
Pension liability adjustment during period, net of income taxes					(1)
Purchases of treasury stock						(612)
Treasury stock reissued			7			18
Balance, end of period at Mar. 31, 2016	20,021	67	1,866	24,565	2,936	(9,413)
Balance, beginning 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			10
Share-based compensation			12
Net earnings	592			592
Dividends to shareholders				(173)
Unrealized foreign currency translation gains (losses) during period, net of income taxes					333
Unrealized gains (losses) on investment securities during period, net of income taxes and reclassification adjustments					(331)
Unrealized gains (losses) on derivatives during period, net of income taxes					2
Pension liability adjustment during period, net of income taxes					(2)
Purchases of treasury stock						(610)
Treasury stock reissued			10			15
Balance, end of period at Mar. 31, 2017	$ 20,340	$ 67	$ 2,008	$ 26,400	$ 2,632	$ (10,767)