Information on Business Segments - Summary of Financial Information for Each Business Segment, Intersegment Sale, Depreciation and Capital Expenditures (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 24, 2018	Mar. 25, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 15,878	$ 15,171	$ 14,427	$ 14,336	$ 14,411	$ 14,318	$ 13,398	$ 11,635	$ 59,812	$ 53,762	$ 49,960
Depreciation and amortization									1,189	1,161	1,195
Capital expenditures									1,484	1,278	1,177
Aeronautics
Segment Reporting Information [Line Items]
Net sales									23,693	21,242	19,410
MFC
Segment Reporting Information [Line Items]
Net sales									10,131	8,462	7,282
Rotary and Mission Systems
Segment Reporting Information [Line Items]
Net sales									15,128	14,250	13,663
Space
Segment Reporting Information [Line Items]
Net sales									10,860	9,808	9,605
Intersegment sales
Segment Reporting Information [Line Items]
Net sales									2,956	2,539	2,389
Intersegment sales | Aeronautics
Segment Reporting Information [Line Items]
Net sales									217	120	122
Intersegment sales | MFC
Segment Reporting Information [Line Items]
Net sales									515	423	355
Intersegment sales | Rotary and Mission Systems
Segment Reporting Information [Line Items]
Net sales									1,872	1,759	1,801
Intersegment sales | Space
Segment Reporting Information [Line Items]
Net sales									352	237	111
Operating Segments
Segment Reporting Information [Line Items]
Net sales									59,812	53,762	49,960
Depreciation and amortization									1,119	1,096	1,123
Capital expenditures									1,356	1,214	1,014
Operating Segments | Aeronautics
Segment Reporting Information [Line Items]
Net sales									23,693	21,242	19,410
Depreciation and amortization									318	304	311
Capital expenditures									526	460	371
Operating Segments | MFC
Segment Reporting Information [Line Items]
Net sales									10,131	8,462	7,282
Depreciation and amortization									124	105	99
Capital expenditures									300	244	156
Operating Segments | Rotary and Mission Systems
Segment Reporting Information [Line Items]
Net sales									15,128	14,250	13,663
Depreciation and amortization									464	458	468
Capital expenditures									272	255	308
Operating Segments | Space
Segment Reporting Information [Line Items]
Net sales									10,860	9,808	9,605
Depreciation and amortization									213	229	245
Capital expenditures									258	255	179
Corporate activities
Segment Reporting Information [Line Items]
Depreciation and amortization									70	65	72
Capital expenditures									$ 128	$ 64	$ 163