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, 2011		$ 66	$ 1,408	$ 15,148	$ 1,965	$ (5,641)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options			13
Share-based compensation			5
Net earnings	785			785
Dividends to shareholders				(154)
Unrealized foreign currency translation gains (losses) during period, net of income taxes					(266)
Unrealized gains (losses) on investment securities during period, net of income taxes and reclassification adjustments					305
Unrealized gains (losses) on derivatives during period, net of income taxes					(8)
Pension liability adjustment during period, net of income taxes					4
Purchases of treasury stock						(10)
Treasury stock reissued			7			16
Balance, end of period at Mar. 31, 2012	13,643	66	1,433	15,779	2,000	(5,635)
Balance, beginning of period at Dec. 31, 2012	15,978	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)