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Segment Information Segment Other Significant Items Reconciliation (Table) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment, Reconciliation of Other Items from Segments to Consolidated    
Capital Expenditures [1] $ 71 $ 67
Depreciation and amortization 76 79
Operating Segments    
Segment, Reconciliation of Other Items from Segments to Consolidated    
Capital Expenditures [1] 70 64
Depreciation and amortization 75 78
Segment Reporting, Reconciling Item, Corporate Nonsegment    
Segment, Reconciliation of Other Items from Segments to Consolidated    
Capital Expenditures [1] 1 3
Depreciation and amortization 1 1
Ingalls | Operating Segments    
Segment, Reconciliation of Other Items from Segments to Consolidated    
Capital Expenditures [1] 10 14
Depreciation and amortization 20 20
Newport News | Operating Segments    
Segment, Reconciliation of Other Items from Segments to Consolidated    
Capital Expenditures [1] 57 49
Depreciation and amortization 35 33
Mission Technologies | Operating Segments    
Segment, Reconciliation of Other Items from Segments to Consolidated    
Capital Expenditures [1] 3 1
Depreciation and amortization $ 20 $ 25
[1] Net of grant proceeds for capital expenditures