Segment Information (Unaudited) Sales by Geographic Location (Details 4) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue, Geographic Location [Line Items]
Sales	$ 8,797	$ 9,157
Sales percentage	100.00%	100.00%
United States
Revenue, Geographic Location [Line Items]
Sales	$ 7,656	$ 7,799
Sales percentage	87.00%	85.00%
United States | Aeronautics Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 2,295	$ 2,547
Sales percentage	87.00%	87.00%
United States | Defense Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 791	$ 1,026
Sales percentage	73.00%	75.00%
United States | Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 1,818	$ 1,850
Sales percentage	81.00%	79.00%
United States | Space Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 2,752	$ 2,376
Sales percentage	98.00%	95.00%
Asia/Pacific
Revenue, Geographic Location [Line Items]
Sales	$ 463	$ 558
Sales percentage	5.00%	6.00%
Asia/Pacific | Aeronautics Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 190	$ 279
Sales percentage	7.00%	9.00%
Asia/Pacific | Defense Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 105	$ 103
Sales percentage	10.00%	7.00%
Asia/Pacific | Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 139	$ 160
Sales percentage	6.00%	7.00%
Asia/Pacific | Space Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 29	$ 16
Sales percentage	1.00%	1.00%
Europe
Revenue, Geographic Location [Line Items]
Sales	$ 503	$ 533
Sales percentage	6.00%	6.00%
Europe | Aeronautics Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 137	$ 100
Sales percentage	5.00%	3.00%
Europe | Defense Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 101	$ 76
Sales percentage	9.00%	6.00%
Europe | Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 225	$ 269
Sales percentage	10.00%	11.00%
Europe | Space Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 40	$ 88
Sales percentage	1.00%	4.00%
All other
Revenue, Geographic Location [Line Items]
Sales	$ 175	$ 267
Sales percentage	2.00%	3.00%
All other | Aeronautics Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 16	$ 20
Sales percentage	1.00%	1.00%
All other | Defense Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 87	$ 172
Sales percentage	8.00%	12.00%
All other | Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 69	$ 73
Sales percentage	3.00%	3.00%
All other | Space Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 3	$ 2
Sales percentage	0.00%	0.00%
Intersegment sales | Aeronautics Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 65	$ 44
Intersegment sales | Defense Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	199	185
Intersegment sales | Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	246	237
Intersegment sales | Space Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	31	39
Operating Segments [Member] | Aeronautics Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 2,703	$ 2,990
Sales percentage	100.00%	100.00%
Operating Segments [Member] | Defense Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 1,283	$ 1,562
Sales percentage	100.00%	100.00%
Operating Segments [Member] | Mission Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 2,497	$ 2,589
Sales percentage	100.00%	100.00%
Operating Segments [Member] | Space Systems [Member]
Revenue, Geographic Location [Line Items]
Sales	$ 2,855	$ 2,521
Sales percentage	100.00%	100.00%