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OTHER - Changes in Estimates (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Change in Accounting Estimate [Line Items]
Performance obligation satisfied in previous period	$ 492	$ 495	$ 984	$ 1,000
Classified Fixed-Price Incentive Fee Contract
Change in Accounting Estimate [Line Items]
Performance growth costs per share, after tax (in dollars per share)	$ 0.61
Classified Fixed-Price Incentive Fee Contract | Aeronautics
Change in Accounting Estimate [Line Items]
Performance growth costs	$ 225
Performance growth costs after tax	169
Ground Based Radar | Rotary and Mission Systems
Change in Accounting Estimate [Line Items]
Reversal of estimated cumulative losses	15
Reversal of estimated cumulative losses after tax	$ 11
Reversal of estimated cumulative losses after tax (in dollars per share)	$ 0.04
Cumulative losses on development	$ 235		235
EADGE-T
Change in Accounting Estimate [Line Items]
Cumulative losses on development	260		260
Warrior Capability Sustainment Program
Change in Accounting Estimate [Line Items]
Cumulative losses on development	100		100
Decrease in estimated cumulative losses	40
Decrease in estimated cumulative losses, after tax	$ 30
Decrease in estimated cumulative losses (in dollars per share)	$ 0.11
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate [Line Items]
Increase in operating profit due to profit rate adjustments	$ 385	480	880	945
Increase in net earnings due to profit rate adjustments	$ 304	$ 379	$ 695	$ 747
Increase in diluted earnings per common share due to profit rate adjustments (in dollars per share)	$ 1.09	$ 1.35	$ 2.49	$ 2.65

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12A
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL108322424-203045

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