Basis of Presentation (Unaudited) (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Accumulated Other Comprehensive Loss
Unamortized benefit plan costs, net of tax benefit of $3,276 as of June 30, 2015 and $3,395 as of December 31, 2014	$ (5,124)		$ (5,124)		$ (5,316)
Cumulative translation adjustment	(57)		(57)		(41)
Net unrealized gain on marketable securities and cash flow hedges, net of tax	0		0		1
Total accumulated other comprehensive loss	(5,181)		(5,181)		(5,356)
Unamortized benefit plan costs - Tax Benefit (expense)	3,276		3,276		3,395
Unamortized benefit plan costs, net actuarial losses, after-tax	5,400		5,400		$ 5,600
Unamortized benefit plan costs, reclassified from other comprehensive income to net earnings	$ 96	$ 35	$ 192	$ 73