Other Comprehensive Earnings (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassifications out of accumulated other comprehensive income (loss) by component
Total before tax	$ 1,005	$ (422)	$ 106	$ (876)
Income tax expense (benefit)	(40)	(152)	(372)	(332)
NET INCOME	(1,045)	270	(478)	544
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Reclassifications out of accumulated other comprehensive income (loss) by component
Net actuarial loss	21		64
Prior service cost	(1)		(4)
Total before tax	22		68
Income tax expense (benefit)	8		26
NET INCOME	$ (14)		$ (42)