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		(6)	(425)
Stock awards		2	(33)
Other			(5)
Net earnings	489			489
Dividends declared				(131)
Other comprehensive income, net of tax	64				64
Cash dividends declared per share (in dollars per share)	$ 0.55
End of Period at Mar. 31, 2013	9,469	235	2,461	11,496	(4,723)
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		(5)	(560)
Stock awards		2	(7)
Other			11
Net earnings	579			579
Dividends declared				(134)
Other comprehensive income, net of tax	63				63
Cash dividends declared per share (in dollars per share)	$ 0.61
End of Period at Mar. 31, 2014	$ 10,569	$ 215	$ 292	$ 12,983	$ (2,921)