Basis of Presentation (Unaudited) (Details 2) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Change in Accounting Estimate [Line Items]
Operating Income (Loss)	$ 845	$ 826	$ 2,532	$ 2,362
Net earnings	$ 645	$ 602	$ 1,837	$ 1,675
Diluted earnings per share	$ 3.68	$ 3.35	$ 10.46	$ 9.23
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating Income (Loss)	$ 102	$ 121	$ 315	$ 387
Net earnings	$ 66	$ 79	$ 205	$ 252
Diluted earnings per share	$ 0.38	$ 0.44	$ 1.17	$ 1.39
Aerospace Systems [Member] | Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating Income (Loss)	$ 56