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 ($)	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2022 USD ($) contract segment $ / shares	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares
Accounting Policies [Abstract]
Number of business segments | segment			4
Significant Accounting Policies [Line Items]
Number of contract types | contract			3
Ending backlog		$ 150,000	$ 150,000
Performance obligation satisfied in previous period			2,000	$ 2,200	$ 2,000
Independent research and development costs charged to cost of sales			1,700	1,500	1,300
Capitalized internal-use software, net		919	919	777
Capitalized internal-use software accumulated amortization		2,600	2,600	2,300
Capitalized internal-use software amortization			253	175	166
Carrying amount of investments held in Lockheed martin venture fund		589	589	577
Realized gain reflected in other non-operating income			114	265
Realized gain recognized for changes in fair value, net of tax			$ 86	$ 199
Net of tax, amount per share ( in dollars per share) | $ / shares			$ 0.33	$ 0.72
Total equity method investments		$ 685	$ 685	$ 689
Net earnings from equity method investments			114	97	163
Equity method investee impairment			$ 0	0	128
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		Other noncurrent assets	Other noncurrent assets
Severance and other charges		$ 100	$ 100	36	27
Severance and restructuring costs, after-tax		$ 79		$ 28	$ 21
Severance and restructuring costs, per share, after-tax (in dollars per share) | $ / shares		$ 0.31		$ 0.10	$ 0.08
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other noncurrent liabilities	Other noncurrent liabilities
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				128
Equity method investee impairment, net of tax					$ 96
Equity method investee impairment (in dollars per share) | $ / shares					$ 0.34
Space Systems
Significant Accounting Policies [Line Items]
Net earnings from equity method investments			$ 100	65	$ 135
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			15 years
Classified Fixed-Price Incentive Fee Contract | Aeronautics
Significant Accounting Policies [Line Items]
Performance growth costs		$ 20	$ 270
Classified Fixed-Price Incentive Fee Contract | RMS
Significant Accounting Policies [Line Items]
Cumulative losses on development		$ 280	$ 280
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage		37.00%	37.00%
Expected time of satisfaction		12 months	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage		61.00%	61.00%
Expected time of satisfaction		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			$ 1,800	2,000	1,800
Increase in net earnings due to profit rate adjustments			$ 1,400	$ 1,600	$ 1,500
Increase in diluted earnings per common share due to profit rate (in dollars per share) | $ / shares			$ 5.40	$ 5.81	$ 5.33