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			17
Share-based compensation			7
Net earnings	$ 663			663
Dividends to shareholders				(171)
Unrealized foreign currency translation gains (losses) during period, net of income taxes					1
Unrealized gains (losses) on investment securities during period, net of income taxes and reclassification adjustments					354
Unrealized gains (losses) on derivatives during period, net of income taxes					(2)
Pension liability adjustment during period, net of income taxes					0
Purchases of treasury stock						(610)
Treasury stock reissued			10			21
Balance, end of period at Mar. 31, 2015	18,637	67	1,745	22,648	2,332	(8,155)
Balance, beginning 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			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)