v3.26.1
Master Trust - Master Trust By Asset Category and Fair Value Hierarchy (Details) - EBP 033 - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
EBP, Master Trust [Line Items]    
Total net assets available for benefits $ 394,999 $ 389,108
Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 55,496,381 50,978,328
Receivables, net 25,344 15,392
Fully benefit-responsive investment contracts at contract value 4,887,387 4,991,458
Total net assets available for benefits 60,409,112 55,985,178
Cash and cash equivalents and short-term investment fund | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 675,098 724,303
Common and preferred stocks | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 8,447,158 6,934,489
Common stocks - Lockheed Martin | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 11,373,758 12,097,506
Common/collective trusts | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 28,919,660 26,108,226
Registered investment companies (mutual funds) | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 1,012,735 718,567
Corporate debt securities | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 867,174 755,451
U.S. Government securities | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 662,609 667,026
Other investments | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 148,008 130,680
Self-directed brokerage account | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 3,390,181 2,842,080
Level 1 | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 24,052,295 22,460,872
Level 1 | Cash and cash equivalents and short-term investment fund | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 18,383 36,089
Level 1 | Common and preferred stocks | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 8,437,126 6,926,943
Level 1 | Common stocks - Lockheed Martin | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 11,373,758 12,097,506
Level 1 | Common/collective trusts | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 0 0
Level 1 | Registered investment companies (mutual funds) | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 832,847 558,254
Level 1 | Corporate debt securities | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 0 0
Level 1 | U.S. Government securities | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 0 0
Level 1 | Other investments | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 0 0
Level 1 | Self-directed brokerage account | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 3,390,181 2,842,080
Level 2  | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 31,444,086 28,517,456
Level 2  | Cash and cash equivalents and short-term investment fund | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 656,715 688,214
Level 2  | Common and preferred stocks | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 10,032 7,546
Level 2  | Common stocks - Lockheed Martin | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 0 0
Level 2  | Common/collective trusts | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 28,919,660 26,108,226
Level 2  | Registered investment companies (mutual funds) | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 179,888 160,313
Level 2  | Corporate debt securities | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 867,174 755,451
Level 2  | U.S. Government securities | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 662,609 667,026
Level 2  | Other investments | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value 148,008 130,680
Level 2  | Self-directed brokerage account | Master Trust Balance    
EBP, Master Trust [Line Items]    
Total investment assets at fair value $ 0 $ 0