Basis of Presentation (Unaudited) (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Loss
Unamortized benefit plan costs, net of tax benefit of $3,227 as of June 30, 2016 and $3,350 as of December 31, 2015	$ (5,040)		$ (5,040)		$ (5,241)
Cumulative translation adjustment	(95)		(95)		(82)
Net unrealized gain on marketable securities and cash flow hedges, net of tax	3		3		3
Total accumulated other comprehensive loss	(5,132)		(5,132)		(5,320)
Unamortized benefit plan costs - Tax Benefit (expense)	3,227		3,227		3,350
Unamortized benefit plan costs, net actuarial losses, after-tax	5,200		5,200		$ 5,500
Unamortized benefit plan costs, reclassified from other comprehensive income to net earnings	$ 100	$ 96	$ 201	$ 192