Basis of Presentation (Unaudited) (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Accumulated Other Comprehensive Loss
Unamortized benefit plan costs, net of tax benefit of $3,378 as of March 31, 2017 and $3,439 as of December 31, 2016	$ (5,317)		$ (5,416)
Cumulative translation adjustment	(128)		(132)
Net unrealized gain on marketable securities and cash flow hedges, net of tax	4		2
Total accumulated other comprehensive loss	(5,441)		(5,546)
Unamortized benefit plan costs - Tax Benefit (expense)	3,378		3,439
Unamortized benefit plan costs, net actuarial losses, after-tax	5,400		$ 5,600
Unamortized benefit plan costs, reclassified from other comprehensive income to net earnings	$ 99	$ 101