Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common stock	Paid-in capital	Retained earnings	Accumulated other comprehensive loss
Beginning of year at Dec. 31, 2013		$ 218	$ 848	$ 12,538	$ (2,984)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		(17)	(943)	(1,099)
Net earnings	$ 1,563			1,563
Dividends declared				(434)
Stock compensation		2	83	0
Other			12
Other comprehensive income, net of tax	106				106
End of period at Sep. 30, 2014	$ 9,893	203	0	12,568	(2,878)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 2.01
Beginning of year at Dec. 31, 2014	$ 7,235	199	0	12,392	(5,356)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		(18)	0	(2,872)
Net earnings	1,531			1,531
Dividends declared				(447)
Stock compensation		2	0	9
Other			0
Other comprehensive income, net of tax	257				257
End of period at Sep. 30, 2015	$ 5,697	$ 183	$ 0	$ 10,613	$ (5,099)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 2.3