Organization and Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 31, 2020 USD ($) $ / shares	Jun. 27, 2021 USD ($) $ / shares	Jun. 28, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) segment	Dec. 31, 2021 USD ($) contract	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2021 USD ($) retiree	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares
Accounting Policies [Abstract]
Number of business segments						4			4
Significant Accounting Policies [Line Items]
Number of contract types | contract							3
Ending backlog				$ 135,400	$ 135,400	$ 135,400	$ 135,400	$ 135,400	$ 135,400
Performance obligation satisfied in previous period					2,200					$ 2,000	$ 2,200
Independent research and development costs charged to cost of sales					1,500					1,300	1,300
Depreciation					904					853	794
Capitalized internal-use software, net				777	777	777	777	777	777	686
Capitalized internal-use software accumulated amortization				2,300	2,300	2,300	2,300	2,300	2,300	2,200
Capitalized internal-use software amortization					175					166	111
Goodwill				$ 10,813	10,813	10,813	10,813	10,813	10,813	10,806	10,604
Time period environmental costs and recovery of environmental costs are projected over				20 years
Fair value of trading securities				$ 2,100	2,100	2,100	2,100	2,100	2,100	2,000
Net gains (losses) on marketable securities					205					231	233
Carrying amount of investments held in Lockheed martin venture fund				465	465	465	465	$ 465	465	173
Realized gain reflected in other non-operating income					265
Realized gain recognized for changes in fair value, net of tax					199
Net of tax, amount per share ( in dollars per share) | $ / shares								$ 0.72
Total equity method investments				$ 689	689	$ 689	$ 689	$ 689	$ 689	784
Net earnings from equity method investments					97					163	154
Equity method investee impairment					$ 0					128	0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]				Other noncurrent assets	Other noncurrent assets	Other noncurrent assets	Other noncurrent assets	Other noncurrent assets	Other noncurrent assets
Severance and restructuring charges					$ 36					27	0
Severance and restructuring costs, after-tax					28					$ 21
Severance and restructuring costs, per share, after-tax (in dollars per share) | $ / shares								$ 0.10		$ 0.08
Severance charges										$ 27
Severance charges, net of tax										$ 21
Severance charges (in dollars per share) | $ / shares										$ 0.08
Restricted Stock Units and Performance Stock Units
Significant Accounting Policies [Line Items]
Number of years over which equity awards vest				3 years
Atomic Weapons Establishment
Significant Accounting Policies [Line Items]
AWE generated sales					885					$ 1,400
Operating profit					18					35
AMMROC
Significant Accounting Policies [Line Items]
Total equity method investments	$ 307
Proceeds from sale of equity method investments	307
Equity method investee impairment	128
Equity method investee impairment, net of tax	$ 96
Equity method investee impairment (in dollars per share) | $ / shares	$ 0.34
Interest rate swaps | Designated as hedges
Significant Accounting Policies [Line Items]
Aggregate notional amount of derivatives				$ 500	500	$ 500	$ 500	$ 500	$ 500	572
Foreign currency contracts | Designated as hedges
Significant Accounting Policies [Line Items]
Aggregate notional amount of derivatives				4,000	4,000	4,000	4,000	4,000	4,000	3,400
AMMROC
Significant Accounting Policies [Line Items]
Equity method investee impairment			$ 128
Space Systems
Significant Accounting Policies [Line Items]
Goodwill				1,777	1,777	1,777	1,777	1,777	1,777	1,760	1,586
Net earnings from equity method investments					67					135	145
Aeronautics
Significant Accounting Policies [Line Items]
Goodwill				187	187	187	187	187	187	187	171
RMS
Significant Accounting Policies [Line Items]
Goodwill				$ 6,759	6,759	6,759	6,759	6,759	6,759	6,768	6,758
Minimum
Significant Accounting Policies [Line Items]
Acquired finite-lived intangible assets are amortized				5 years
Minimum | Customer programs
Significant Accounting Policies [Line Items]
Acquired finite-lived intangible assets are amortized				9 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]
Acquired finite-lived intangible assets are amortized				20 years
Maximum | Customer programs
Significant Accounting Policies [Line Items]
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				6 years
EADGE-T
Significant Accounting Policies [Line Items]
Cumulative losses on development				$ 260	260	260	260	260	260
Classified Fixed-Price Incentive Fee Contract | Aeronautics
Significant Accounting Policies [Line Items]
Performance growth costs		$ 225
Performance growth costs after tax		$ 169
Performance growth costs per share, after-tax (in dollars per share) | $ / shares		$ 0.61
Performance growth costs				225	225	225	225	225	225
Classified Fixed-Price Incentive Fee Contract | RMS
Significant Accounting Policies [Line Items]
Cumulative losses on development				$ 280	$ 280	$ 280	$ 280	$ 280	$ 280
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Over the next 12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage				38.00%	38.00%	38.00%	38.00%	38.00%	38.00%
Expected time of satisfaction				12 months	12 months	12 months	12 months	12 months	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Over the next 24 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage				60.00%	60.00%	60.00%	60.00%	60.00%	60.00%
Expected time of satisfaction				24 months	24 months	24 months	24 months	24 months	24 months
Contracts Accounted for under Percentage of Completion
Significant Accounting Policies [Line Items]
Increase in operating profit due to profit rate adjustments					$ 2,000					1,800	1,900
Increase in net earnings due to profit rate adjustments					$ 1,600					$ 1,500	$ 1,500
Increase in diluted earnings per common share due to profit rate (in dollars per share) | $ / shares								$ 5.81		$ 5.33	$ 5.29