Organization and Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Jun. 25, 2023 USD ($) $ / shares	Dec. 31, 2023 USD ($) segment contract $ / shares	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares
Accounting Policies [Abstract]
Number of business segments | segment		4
Number of contract types | contract		3
Significant Accounting Policies [Line Items]
Ending backlog		$ 160,600
Performance obligation satisfied in previous period		1,600	$ 2,000	$ 2,200
Independent research and development costs charged to cost of sales		$ 1,500	1,700	1,500
Number of years over which equity awards vest		1 year
Capitalized internal-use software, net		$ 1,400	919
Capitalized internal-use software accumulated amortization		2,800	2,600
Capitalized internal-use software amortization		263	253	175
Carrying amount of investments held in Lockheed martin venture fund		581	589
Realized (loss) gain reflected in other non-operating income		(64)	(114)	265
Realized (loss) gain recognized for changes in fair value, net of tax		$ (48)	$ (86)	$ 199
Net of tax, amount per share ( in dollars per share) | $ / shares		$ (0.19)	$ (0.33)	$ 0.72
Equity method investments		$ 701	$ 685
Net earnings from equity method investments		$ 40	114	$ 97
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		Other noncurrent assets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]		Other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]		Other noncurrent liabilities
Time period environmental costs and recovery of environmental costs are projected over		20 years
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other current assets, Other noncurrent assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other current liabilities, Other noncurrent liabilities
Minimum
Significant Accounting Policies [Line Items]
Number of years over which equity awards vest		1 year
Acquired finite-lived intangible assets are amortized		3 years
Minimum | Buildings
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated life		10 years
Minimum | Machinery and equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated life		5 years
Minimum | Capitalized Software
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated life		2 years
Maximum
Significant Accounting Policies [Line Items]
Number of years over which equity awards vest		3 years
Acquired finite-lived intangible assets are amortized		20 years
Maximum | Buildings
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated life		40 years
Maximum | Machinery and equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated life		15 years
Maximum | Capitalized Software
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated life		15 years
Restricted Stock Units and Performance Stock Units
Significant Accounting Policies [Line Items]
Number of years over which equity awards vest		3 years
MFC
Significant Accounting Policies [Line Items]
Cumulative losses on development		$ 45
Space
Significant Accounting Policies [Line Items]
Net earnings from equity method investments		20	100	65
Classified Fixed-Price Incentive Fee Contract | Aeronautics
Significant Accounting Policies [Line Items]
Performance growth costs		270
Classified Fixed-Price Incentive Fee Contract | RMS
Significant Accounting Policies [Line Items]
Cumulative losses on development		$ 280
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Period One
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage		36.00%
Expected time of satisfaction		12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Period Two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage		62.00%
Expected time of satisfaction		24 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected time of satisfaction
Contracts Accounted for under Percentage of Completion
Significant Accounting Policies [Line Items]
Increase (decrease) in operating profit due to profit rate adjustments	$ 100	$ 1,600	1,800	2,000
Increase (decrease) in net earnings due to profit rate adjustments	$ 75	$ 1,300	$ 1,400	$ 1,600
Increase (decrease) in diluted earnings per common share due to profit rate adjustments (in dollars per share) | $ / shares	$ 0.29	$ 4.98	$ 5.40	$ 5.81