Basis of Presentation (Unaudited) (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Accumulated Other Comprehensive Loss
Unamortized benefit plan costs, net of tax benefit of $3,217 as of September 30, 2015 and $3,395 as of December 31, 2014	$ (5,028)		$ (5,028)		$ (5,316)
Cumulative translation adjustment	(72)		(72)		(41)
Net unrealized gain on marketable securities and cash flow hedges, net of tax	1		1		1
Total accumulated other comprehensive loss	(5,099)		(5,099)		(5,356)
Unamortized benefit plan costs - Tax Benefit (expense)	3,217		3,217		3,395
Unamortized benefit plan costs, net actuarial losses, after-tax	5,300		5,300		$ 5,600
Unamortized benefit plan costs, reclassified from other comprehensive income to net earnings	$ 96	$ 35	$ 288	$ 108