Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	Total	Common stock	Paid-in capital	Retained earnings	Accumulated other comprehensive loss
Beginning of Year at Dec. 31, 2012		$ 239	$ 2,924	$ 11,138	$ (4,787)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		(21)	(1,652)	0
Stock awards		6	212
Other			(5)
Net earnings	1,474			1,474
Dividends declared				(416)
Other comprehensive income, net of tax	244				244
Cash dividends declared per share (in dollars per share)	$ 1.77
End of Period at Sep. 30, 2013	9,356	224	1,479	12,196	(4,543)
Beginning of Year at Dec. 31, 2013	10,620	218	848	12,538	(2,984)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		(17)	(943)	(1,099)
Stock awards		2	83
Other			12
Net earnings	1,563			1,563
Dividends declared				(434)
Other comprehensive income, net of tax	106				106
Cash dividends declared per share (in dollars per share)	$ 2.01
End of Period at Sep. 30, 2014	$ 9,893	$ 203	$ 0	$ 12,568	$ (2,878)