Basis of Presentation (Unaudited) (Details 1) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Change in Accounting Estimate [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 149	$ 122	$ 438	$ 368
Operating income	1,178	837	2,855	2,572
Net earnings	$ 1,144	$ 643	$ 2,572	$ 1,848
Earnings Per Share, Diluted	$ 6.54	$ 3.67	$ 14.68	$ 10.52
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income	$ 149	$ 114	$ 408	$ 357
Net earnings	$ 117	$ 74	$ 322	$ 232
Earnings Per Share, Diluted	$ 0.67	$ 0.42	$ 1.84	$ 1.32
Aerospace Systems [Member] | Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income		$ 56