Segment Information (Unaudited) Sales by Customer Type (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue, Major Customer [Line Items]
Sales	$ 8,884	$ 8,456	$ 17,504	$ 16,645
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
U.S. government(1)
Revenue, Major Customer [Line Items]
Sales	$ 7,469	$ 6,944	$ 14,563	$ 13,701
Concentration Risk, Percentage	84.00%	82.00%	83.00%	82.00%
U.S. government(1) | Aeronautics Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 2,477	$ 2,238	$ 4,838	$ 4,572
Concentration Risk, Percentage	85.00%	82.00%	84.00%	82.00%
U.S. government(1) | Defense Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,305	$ 1,281	$ 2,564	$ 2,422
Concentration Risk, Percentage	69.00%	67.00%	68.00%	66.00%
U.S. government(1) | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,776	$ 1,746	$ 3,447	$ 3,359
Concentration Risk, Percentage	73.00%	73.00%	72.00%	73.00%
U.S. government(1) | Space Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,911	$ 1,679	$ 3,714	$ 3,348
Concentration Risk, Percentage	93.00%	94.00%	93.00%	93.00%
International(2)
Revenue, Major Customer [Line Items]
Sales	$ 1,261	$ 1,301	$ 2,596	$ 2,518
Concentration Risk, Percentage	14.00%	16.00%	15.00%	15.00%
International(2) | Aeronautics Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 407	$ 439	$ 851	$ 874
Concentration Risk, Percentage	14.00%	16.00%	15.00%	16.00%
International(2) | Defense Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 316	$ 365	$ 656	$ 728
Concentration Risk, Percentage	17.00%	19.00%	18.00%	20.00%
International(2) | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 468	$ 465	$ 951	$ 841
Concentration Risk, Percentage	19.00%	19.00%	20.00%	18.00%
International(2) | Space Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 70	$ 32	$ 138	$ 75
Concentration Risk, Percentage	4.00%	2.00%	3.00%	2.00%
Other customers
Revenue, Major Customer [Line Items]
Sales	$ 154	$ 211	$ 345	$ 426
Concentration Risk, Percentage	2.00%	2.00%	2.00%	3.00%
Other customers | Aeronautics Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 12	$ 20	$ 24	$ 45
Concentration Risk, Percentage	0.00%	1.00%	0.00%	1.00%
Other customers | Defense Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 85	$ 106	$ 196	$ 203
Concentration Risk, Percentage	4.00%	5.00%	5.00%	5.00%
Other customers | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 18	$ 29	$ 35	$ 53
Concentration Risk, Percentage	1.00%	1.00%	1.00%	1.00%
Other customers | Space Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 39	$ 56	$ 90	$ 125
Concentration Risk, Percentage	2.00%	3.00%	3.00%	4.00%
Intersegment Sales [Member] | Aeronautics Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 29	$ 24	$ 55	$ 48
Concentration Risk, Percentage	1.00%	1.00%	1.00%	1.00%
Intersegment Sales [Member] | Defense Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 180	$ 164	$ 351	$ 331
Concentration Risk, Percentage	10.00%	9.00%	9.00%	9.00%
Intersegment Sales [Member] | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 184	$ 164	$ 360	$ 361
Concentration Risk, Percentage	7.00%	7.00%	7.00%	8.00%
Intersegment Sales [Member] | Space Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 28	$ 21	$ 54	$ 41
Concentration Risk, Percentage	1.00%	1.00%	1.00%	1.00%
Operating Segments [Member] | Aeronautics Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 2,925	$ 2,721	$ 5,768	$ 5,539
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Defense Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,886	$ 1,916	$ 3,767	$ 3,684
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 2,446	$ 2,404	$ 4,793	$ 4,614
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Space Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 2,048	$ 1,788	$ 3,996	$ 3,589
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%