Basis of Presentation (Unaudited) (Details 1) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Change in Accounting Estimate [Line Items]
Operating income	$ 936	$ 848
Net earnings	$ 863	$ 840
Earnings Per Share, Diluted	$ 5.06	$ 4.79
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 166	$ 133
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income	138	116
Net earnings	$ 109	$ 92
Earnings Per Share, Diluted	$ 0.64	$ 0.52