Basis of Presentation (Unaudited) (Details 1) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Change in Accounting Estimate [Line Items]
Operating income	$ 951	$ 1,172	$ 2,833	$ 2,837
Net earnings	$ 933	$ 1,244	$ 2,657	$ 2,873
Earnings Per Share, Diluted	$ 5.49	$ 7.11	$ 15.60	$ 16.40
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 142	$ 149	$ 462	$ 438
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income	125	149	421	408
Net earnings	$ 99	$ 117	$ 333	$ 322
Earnings Per Share, Diluted	$ 0.58	$ 0.67	$ 1.96	$ 1.84