Condesned Consolidated Statements of Changes in Shareholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Net Unrealized Gains on Investments [Member]	Foreign Currency Translation (Losses) Gains
Balance at Dec. 31, 2013	$ 32,149	$ 10	$ 0	$ 33,047	$ 54	$ (962)
Balance (in shares) at Dec. 31, 2013		988
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	1,099			1,099
Other comprehensive income (loss)	335				76	259
Issuances of common share, and related tax effects (in shares)		8
Issuances of common share, and related tax effects	(6)	0	(6)
Share-based compensation, and related tax benefits	159		159
Common share repurchases (in shares)		(12)
Common share repurchases	(911)	0	(153)	(758)
Cash dividends paid on common shares	(276)			(276)
Balance at Mar. 31, 2014	32,549	10	0	33,112	130	(703)
Balance (in shares) at Mar. 31, 2014		984
Balance at Dec. 31, 2014	32,454	10	0	33,836	223	(1,615)
Balance (in shares) at Dec. 31, 2014	954	954
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	1,413			1,413
Other comprehensive income (loss)	(893)				66	(959)
Issuances of common share, and related tax effects (in shares)		6
Issuances of common share, and related tax effects	0	0	0
Share-based compensation, and related tax benefits	206		206
Noncontrolling interests fair value and other adjustments	(49)		(49)
Common share repurchases (in shares)		(8)
Common share repurchases	(896)	0	(157)	(739)
Cash dividends paid on common shares	(357)			(357)
Balance at Mar. 31, 2015	$ 31,878	$ 10	$ 0	$ 34,153	$ 289	$ (2,574)
Balance (in shares) at Mar. 31, 2015	952	952