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		(11)	(896)	(398)
Net earnings	$ 1,090			1,090
Dividends declared				(285)
Stock compensation		2	37	0
Other			11
Other comprehensive income, net of tax	98				98
End of period at Jun. 30, 2014	$ 10,268	209	0	12,945	(2,886)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.31
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		(12)	0	(1,933)
Net earnings	1,015			1,015
Dividends declared				(297)
Stock compensation		1	0	(13)
Other			0
Other comprehensive income, net of tax	175				175
End of period at Jun. 30, 2015	$ 6,171	$ 188	$ 0	$ 11,164	$ (5,181)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.5