Revenue (Table) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Sales and service revenues	$ 3,099	$ 2,734
Intersegment Elimination
Disaggregation of Revenue [Line Items]
Sales and service revenues	(39)	(34)
Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	3,099	2,734
Firm fixed-price
Disaggregation of Revenue [Line Items]
Sales and service revenues	104	99
Fixed-price incentive
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,357	1,294
Cost-type
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,610	1,303
Time-and-materials
Disaggregation of Revenue [Line Items]
Sales and service revenues	28	38
Federal
Disaggregation of Revenue [Line Items]
Sales and service revenues	3,096	2,730
Commercial
Disaggregation of Revenue [Line Items]
Sales and service revenues	3	4
Product [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	2,004	1,713
Product [Member] \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	2,004	1,713
Service [Member]
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,095	1,021
Service [Member] \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,095	1,021
Ingalls \| Intersegment Elimination
Disaggregation of Revenue [Line Items]
Sales and service revenues	3	4
Ingalls \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	725	637
Ingalls \| Amphibious assault ships \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	345	332
Ingalls \| Surface combatants and coast guard cutters \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	377	299
Ingalls \| Other programs \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	3	6
Ingalls \| Firm fixed-price \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	1
Ingalls \| Fixed-price incentive \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	613	526
Ingalls \| Cost-type \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	108	107
Ingalls \| Federal \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	722	633
Ingalls \| Product [Member] \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	614	526
Ingalls \| Service [Member] \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	108	107
Newport News \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,665	1,396
Newport News \| Other programs \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	162	122
Newport News \| Aircraft carriers \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	881	758
Newport News \| Submarines \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	622	516
Newport News \| Firm fixed-price \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues		2
Newport News \| Fixed-price incentive \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	744	766
Newport News \| Cost-type \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	921	627
Newport News \| Time-and-materials \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues		1
Newport News \| Federal \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,665	1,396
Newport News \| Product [Member] \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	1,364	1,160
Newport News \| Service [Member] \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	301	236
Mission Technologies \| Intersegment Elimination
Disaggregation of Revenue [Line Items]
Sales and service revenues	36	30
Mission Technologies \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	748	735
Mission Technologies \| All-domain operations and warfare systems \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	492	485
Mission Technologies \| Global security, unmanned systems, and other \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	256	250
Mission Technologies \| Firm fixed-price \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	103	97
Mission Technologies \| Fixed-price incentive \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues		2
Mission Technologies \| Cost-type \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	581	569
Mission Technologies \| Time-and-materials \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	28	37
Mission Technologies \| Federal \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	709	701
Mission Technologies \| Commercial \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	3	4
Mission Technologies \| Product [Member] \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	26	27
Mission Technologies \| Service [Member] \| Operating Segments
Disaggregation of Revenue [Line Items]
Sales and service revenues	$ 686	$ 678