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, 2012		$ 67	$ 1,505	$ 17,387	$ 2,715	$ (5,696)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options			10
Share-based compensation			3
Net earnings	892			892
Dividends to shareholders				(165)
Unrealized foreign currency translation gains (losses) during period, net of income taxes					(474)
Unrealized gains (losses) on investment securities during period, net of income taxes and reclassification adjustments					(589)
Unrealized gains (losses) on derivatives during period, net of income taxes					(4)
Pension liability adjustment during period, net of income taxes					3
Purchases of treasury stock						(156)
Treasury stock reissued			14			23
Balance, end of period at Mar. 31, 2013	15,535	67	1,532	18,114	1,651	(5,829)
Balance, beginning of period at Dec. 31, 2013	14,620	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)