Basis of Presentation (Unaudited) (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Loss
Unamortized benefit plan costs, net of tax benefit of $3,166 as of September 30, 2016 and $3,350 as of December 31, 2015	$ (4,939)		$ (4,939)		$ (5,241)
Cumulative translation adjustment	(101)		(101)		(82)
Net unrealized gain on marketable securities and cash flow hedges, net of tax	2		2		3
Total accumulated other comprehensive loss	(5,038)		(5,038)		(5,320)
Unamortized benefit plan costs - Tax Benefit (expense)	3,166		3,166		3,350
Unamortized benefit plan costs, net actuarial losses, after-tax	5,100		5,100		$ 5,500
Unamortized benefit plan costs, reclassified from other comprehensive income to net earnings	$ 101	$ 96	$ 302	$ 288