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, 2018	Sep. 30, 2018	Jun. 24, 2018	Mar. 25, 2018	Dec. 31, 2017	Sep. 24, 2017	Jun. 25, 2017	Mar. 26, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 14,411	$ 14,318	$ 13,398	$ 11,635	$ 13,844	$ 12,341	$ 12,563	$ 11,212	$ 53,762	$ 49,960	$ 47,290
Depreciation and amortization									1,161	1,195	1,167
Capital expenditures									1,278	1,177	1,063
Aeronautics
Segment Reporting Information [Line Items]
Net sales									21,242	19,410	17,293
MFC
Segment Reporting Information [Line Items]
Net sales									8,462	7,282	6,789
Rotary and Mission Systems
Segment Reporting Information [Line Items]
Net sales									14,250	13,663	13,595
Space
Segment Reporting Information [Line Items]
Net sales									9,808	9,605	9,613
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									2,806	2,608	2,405
Intersegment Eliminations | Aeronautics
Segment Reporting Information [Line Items]
Net sales									120	122	142
Intersegment Eliminations | MFC
Segment Reporting Information [Line Items]
Net sales									423	355	299
Intersegment Eliminations | Rotary and Mission Systems
Segment Reporting Information [Line Items]
Net sales									2,026	2,020	1,854
Intersegment Eliminations | Space
Segment Reporting Information [Line Items]
Net sales									237	111	110
Operating Segments
Segment Reporting Information [Line Items]
Net sales									53,762	49,960	47,290
Depreciation and amortization									1,096	1,123	1,092
Capital expenditures									1,214	1,014	979
Operating Segments | Aeronautics
Segment Reporting Information [Line Items]
Net sales									21,242	19,410	17,293
Depreciation and amortization									304	311	299
Capital expenditures									460	371	358
Operating Segments | MFC
Segment Reporting Information [Line Items]
Net sales									8,462	7,282	6,789
Depreciation and amortization									105	99	105
Capital expenditures									244	156	167
Operating Segments | Rotary and Mission Systems
Segment Reporting Information [Line Items]
Net sales									14,250	13,663	13,595
Depreciation and amortization									458	468	476
Capital expenditures									255	308	271
Operating Segments | Space
Segment Reporting Information [Line Items]
Net sales									9,808	9,605	9,613
Depreciation and amortization									229	245	212
Capital expenditures									255	179	183
Corporate activities
Segment Reporting Information [Line Items]
Depreciation and amortization									65	72	75
Capital expenditures									64	163	75
Continuing Operations
Segment Reporting Information [Line Items]
Capital expenditures									$ 1,278	$ 1,177	1,054
Information Systems & Global Solutions
Segment Reporting Information [Line Items]
Depreciation and amortization											48
Capital expenditures											$ 9