Consolidated Statements of Shareholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common stock:	Additional paid-in capital:	Retained earnings:	Accumulated other comprehensive income (loss):	Treasury stock:
Balance, beginning of period at Dec. 31, 2013		$ 67	$ 1,644	$ 19,885	$ (563)	$ (6,413)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options			6
Share-based compensation			5
Net earnings	732			732
Dividends to shareholders				(170)
Unrealized foreign currency translation gains (losses) during period, net of income taxes					(37)
Unrealized gains (losses) on investment securities during period, net of income taxes and reclassification adjustments					909
Unrealized gains (losses) on derivatives during period, net of income taxes					(1)
Pension liability adjustment during period, net of income taxes					(1)
Purchases of treasury stock						(421)
Treasury stock reissued			12			22
Balance, end of period at Mar. 31, 2014	15,676	67	1,667	20,447	307	(6,812)
Balance, beginning of period at Dec. 31, 2014	18,347	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)