Basis of Presentation (Unaudited) (Details 1) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Change in Accounting Estimate [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 156	$ 101	$ 289	$ 246
Operating income	823	873	1,677	1,735
Net earnings	$ 689	$ 555	$ 1,428	$ 1,205
Earnings Per Share, Diluted	$ 3.93	$ 3.16	$ 8.14	$ 6.85
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income	$ 143	$ 102	$ 259	$ 243
Net earnings	$ 113	$ 66	$ 205	$ 158
Earnings Per Share, Diluted	$ 0.64	$ 0.38	$ 1.17	$ 0.90
Aerospace Systems [Member] | Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income	$ 69