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		(13)	(907)	0
Stock awards		5	112
Other			(5)
Net earnings	977			977
Dividends declared				(277)
Other comprehensive income, net of tax	152				152
Cash dividends declared per share (in dollars per share)	$ 1.16
End of Period at Jun. 30, 2013	9,558	231	2,124	11,838	(4,635)
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		(11)	(896)	(398)
Stock awards		2	37
Other			11
Net earnings	1,090			1,090
Dividends declared				(285)
Other comprehensive income, net of tax	98				98
Cash dividends declared per share (in dollars per share)	$ 1.31
End of Period at Jun. 30, 2014	$ 10,268	$ 209	$ 0	$ 12,945	$ (2,886)