v3.26.3
Summary of Significant Accounting Policies (Unaudited) Contract Estimates (Details 2) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 18 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Mar. 31, 2025
Change in Accounting Estimate [Abstract]                  
Operating income $ 1,269     $ 1,242     $ 3,354 $ 3,240  
Net earnings $ 1,124     $ 1,100     $ 3,093 $ 2,755  
Diluted earnings per share $ 7.89     $ 7.67     $ 21.72 $ 19.12  
B-21 loss provision             $ 0 $ 477 $ 2,000
Change in Accounting Estimate [Line Items]                  
Operating income $ 1,269     $ 1,242     3,354 3,240  
Net earnings $ 1,124     $ 1,100     $ 3,093 $ 2,755  
Diluted earnings per share $ 7.89     $ 7.67     $ 21.72 $ 19.12  
B-21 loss provision             $ 0 $ 477 $ 2,000
Contracts Accounted for under Percentage of Completion [Member]                  
Change in Accounting Estimate [Abstract]                  
Revenue $ 240     $ 181     344 383  
Operating income 221     81     235 107  
Net earnings $ 175     $ 64     $ 186 $ 85  
Diluted earnings per share $ 1.23     $ 0.45     $ 1.31 $ 0.59  
Change in Accounting Estimate [Line Items]                  
Revenue $ 240     $ 181     $ 344 $ 383  
Operating income 221     81     235 107  
Net earnings $ 175     $ 64     $ 186 $ 85  
Diluted earnings per share $ 1.23     $ 0.45     $ 1.31 $ 0.59  
B-21 Program LRIP Options 1-5 | Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems [Member]                  
Change in Accounting Estimate [Abstract]                  
Loss Contingency Accrual $ 1,000           $ 1,000    
Change in Accounting Estimate [Line Items]                  
Loss Contingency Accrual $ 1,000           $ 1,000    
B-21 Program LRIP Options 1-4 | Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems [Member]                  
Change in Accounting Estimate [Abstract]                  
Operating income     $ (157)            
Change in Accounting Estimate [Line Items]                  
Operating income     (157)            
B-21 Program LRIP Options 1-2 | Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems [Member]                  
Change in Accounting Estimate [Abstract]                  
Operating income       $ 122   $ 226      
Change in Accounting Estimate [Line Items]                  
Operating income       122   $ 226      
Sentinel EMD phase [Member] | Contracts Accounted for under Percentage of Completion [Member] | Defense Systems [Member]                  
Change in Accounting Estimate [Abstract]                  
Operating income         $ 76        
Change in Accounting Estimate [Line Items]                  
Operating income         $ 76        
Restricted Microelectronics | Contracts Accounted for under Percentage of Completion [Member] | Mission Systems [Member]                  
Change in Accounting Estimate [Abstract]                  
Operating income       68          
Change in Accounting Estimate [Line Items]                  
Operating income       $ 68          
Stand-in Attack Weapon Program [Member] | Contracts Accounted for under Percentage of Completion [Member] | Defense Systems [Member]                  
Change in Accounting Estimate [Abstract]                  
Operating income   $ (68)              
Change in Accounting Estimate [Line Items]                  
Operating income   (68)              
GEM 63XL Program | Contracts Accounted for under Percentage of Completion [Member] | Space Systems [Member]                  
Change in Accounting Estimate [Abstract]                  
Operating income   (91) (71)            
Change in Accounting Estimate [Line Items]                  
Operating income   $ (91) $ (71)