Segment Information (Unaudited) Sales by Contract Type (Details 3) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue, Contract Type [Line Items]
Revenues	$ 9,881	$ 9,468
Cost Reimbursable
Revenue, Contract Type [Line Items]
Revenues	$ 4,936	$ 5,007
Sales percentage	50.00%	53.00%
Fixed-price [Member]
Revenue, Contract Type [Line Items]
Revenues	$ 4,945	$ 4,461
Sales percentage	50.00%	47.00%
Aeronautics Systems [Member] \| Cost Reimbursable
Revenue, Contract Type [Line Items]
Revenues	$ 1,359	$ 1,339
Sales percentage	42.00%	48.00%
Aeronautics Systems [Member] \| Fixed-price [Member]
Revenue, Contract Type [Line Items]
Revenues	$ 1,890	$ 1,434
Sales percentage	58.00%	52.00%
Aeronautics Systems [Member] \| Intersegment sales
Revenue, Contract Type [Line Items]
Revenues	$ 34	$ 41
Aeronautics Systems [Member] \| Operating Segments [Member]
Revenue, Contract Type [Line Items]
Revenues	3,283	2,814
Defense Systems [Member] \| Cost Reimbursable
Revenue, Contract Type [Line Items]
Revenues	$ 1,066	$ 965
Sales percentage	58.00%	55.00%
Defense Systems [Member] \| Fixed-price [Member]
Revenue, Contract Type [Line Items]
Revenues	$ 781	$ 795
Sales percentage	42.00%	45.00%
Defense Systems [Member] \| Intersegment sales
Revenue, Contract Type [Line Items]
Revenues	$ 52	$ 45
Defense Systems [Member] \| Operating Segments [Member]
Revenue, Contract Type [Line Items]
Revenues	1,899	1,805
Mission Systems [Member] \| Cost Reimbursable
Revenue, Contract Type [Line Items]
Revenues	$ 1,181	$ 1,163
Sales percentage	48.00%	47.00%
Mission Systems [Member] \| Fixed-price [Member]
Revenue, Contract Type [Line Items]
Revenues	$ 1,295	$ 1,309
Sales percentage	52.00%	53.00%
Mission Systems [Member] \| Intersegment sales
Revenue, Contract Type [Line Items]
Revenues	$ 385	$ 335
Mission Systems [Member] \| Operating Segments [Member]
Revenue, Contract Type [Line Items]
Revenues	2,861	2,807
Space Systems [Member] \| Cost Reimbursable
Revenue, Contract Type [Line Items]
Revenues	$ 1,330	$ 1,540
Sales percentage	58.00%	63.00%
Space Systems [Member] \| Fixed-price [Member]
Revenue, Contract Type [Line Items]
Revenues	$ 979	$ 923
Sales percentage	42.00%	37.00%
Space Systems [Member] \| Intersegment sales
Revenue, Contract Type [Line Items]
Revenues	$ 171	$ 105
Space Systems [Member] \| Operating Segments [Member]
Revenue, Contract Type [Line Items]
Revenues	$ 2,480	$ 2,568

NORTHROP GRUMMAN CORP /DE/ 10-Q