Segment Information Reconciliation to Consolidated Operating Income (Details 1) $ in Millions	3 Months Ended								7 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Number of reportable segments										4
Sales	$ 8,721	$ 8,475	$ 8,456	$ 8,189	$ 8,156	$ 8,085	$ 7,119	$ 6,735		$ 33,841	$ 30,095	$ 26,004
Operating income	$ 1,136	$ 951	$ 946	$ 936	$ 943	$ 1,172	$ 817	$ 848		3,969	3,780	3,218
Operating Segments
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income										3,909	3,447	2,903
Operating Segments | Aerospace Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										13,862	13,096	12,131
Operating income										1,434	1,411	1,289
Operating Segments | Innovation Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales									$ 3,300	6,119	3,276	0
Operating income									$ 343	671	343	0
Operating Segments | Mission Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										12,263	11,709	11,470
Operating income										1,639	1,520	1,442
Operating Segments | Technology Services
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										4,110	4,297	4,687
Operating income										457	443	449
Intersegment sales
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										2,513	2,283	2,284
Operating income										292	270	277
Intersegment sales | Aerospace Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										204	197	295
Operating income										23	23	33
Intersegment sales | Innovation Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										331	127	0
Operating income										14	1	0
Intersegment sales | Mission Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										1,227	1,145	954
Operating income										177	165	141
Intersegment sales | Technology Services
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Sales										751	814	1,035
Operating income										78	81	103
Corporate, Non-Segment [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income										(405)	(280)	(323)
Segment Reconciling Items [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Net FAS (service)/ CAS pension adjustment										$ 465	$ 613	$ 638