Basis of Presentation (Unaudited) (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Accumulated Other Comprehensive Loss
Unamortized benefit plan costs, net of tax benefit of $3,257 in 2017 and $3,439 in 2016	$ (5,116)		$ (5,116)		$ (5,416)
Cumulative translation adjustment	(132)		(132)		(132)
Net unrealized gain on marketable securities and cash flow hedges, net of tax	5		5		2
Total accumulated other comprehensive loss	(5,243)		(5,243)		(5,546)
Unamortized benefit plan costs - Tax Benefit (expense)	3,257		3,257		3,439
Unamortized benefit plan costs, net actuarial losses, after-tax	5,200		5,200		5,600
Unamortized benefit plan costs, reclassified from other comprehensive income to net earnings	$ 100	$ 101	$ 299	$ 302
Sales [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification					200
Operating Income (Loss) [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification					$ 70