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Segment Operating Results (Table) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Sales and Service Revenues    
Sales and service revenue $ 3,099 $ 2,734
Income (loss) from operating investments, net 5 13
Operating Income (Loss)    
Operating income (loss) 155 161
Product [Member]    
Sales and Service Revenues    
Sales and service revenue 2,004 1,713
Cost of sales and service revenues 1,741 1,451
Service [Member]    
Sales and Service Revenues    
Sales and service revenue 1,095 1,021
Cost of sales and service revenues 950 889
Operating Segments    
Sales and Service Revenues    
Sales and service revenue 3,099 2,734
Income (loss) from operating investments, net 5 13
Segment Reporting, Other Segment Item, Amount 250 246
Operating Income (Loss)    
Operating income (loss) 172 171
Operating Segments | Product [Member]    
Sales and Service Revenues    
Sales and service revenue 2,004 1,713
Cost of sales and service revenues 1,734 1,443
Operating Segments | Service [Member]    
Sales and Service Revenues    
Sales and service revenue 1,095 1,021
Cost of sales and service revenues 948 887
Intersegment Elimination    
Sales and Service Revenues    
Sales and service revenue (39) (34)
Cost of sales and service revenues (39) (34)
Segment Reporting, Reconciling Item, Corporate Nonsegment    
Non-segment factors affecting operating income (loss)    
Operating FAS/CAS Adjustment (9) (10)
Non-current state income taxes (8)  
Ingalls | Operating Segments    
Sales and Service Revenues    
Sales and service revenue 725 637
Segment Reporting, Other Segment Item, Amount 46 45
Operating Income (Loss)    
Operating income (loss) 49 46
Ingalls | Operating Segments | Product [Member]    
Sales and Service Revenues    
Sales and service revenue 614 526
Cost of sales and service revenues 531 452
Ingalls | Operating Segments | Service [Member]    
Sales and Service Revenues    
Sales and service revenue 108 107
Cost of sales and service revenues 96 90
Ingalls | Intersegment Elimination    
Sales and Service Revenues    
Sales and service revenue 3 4
Cost of sales and service revenues 3 4
Newport News | Operating Segments    
Sales and Service Revenues    
Sales and service revenue 1,665 1,396
Segment Reporting, Other Segment Item, Amount 143 147
Operating Income (Loss)    
Operating income (loss) 88 85
Newport News | Operating Segments | Product [Member]    
Sales and Service Revenues    
Sales and service revenue 1,364 1,160
Cost of sales and service revenues 1,179 971
Newport News | Operating Segments | Service [Member]    
Sales and Service Revenues    
Sales and service revenue 301 236
Cost of sales and service revenues 255 193
Mission Technologies | Operating Segments    
Sales and Service Revenues    
Sales and service revenue 748 735
Income (loss) from operating investments, net 5 13
Segment Reporting, Other Segment Item, Amount 61 54
Operating Income (Loss)    
Operating income (loss) 35 40
Mission Technologies | Operating Segments | Product [Member]    
Sales and Service Revenues    
Sales and service revenue 26 27
Cost of sales and service revenues 24 20
Mission Technologies | Operating Segments | Service [Member]    
Sales and Service Revenues    
Sales and service revenue 686 678
Cost of sales and service revenues 597 604
Mission Technologies | Intersegment Elimination    
Sales and Service Revenues    
Sales and service revenue 36 30
Cost of sales and service revenues $ 36 $ 30