Segment Information (Unaudited) Sales by Customer Type (Details 2) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 11,122	$ 10,423	$ 31,879	$ 30,242
US Government
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 9,435	$ 8,632	$ 27,126	$ 25,423
Sales percentage	85.00%	83.00%	85.00%	84.00%
International(2)
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 1,483	$ 1,603	$ 4,307	$ 4,290
Sales percentage	13.00%	15.00%	14.00%	14.00%
Other Customers [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 204	$ 188	$ 446	$ 529
Sales percentage	2.00%	2.00%	1.00%	2.00%
Aeronautics Systems [Member] \| US Government
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 2,846	$ 2,530	$ 8,349	$ 7,346
Sales percentage	80.00%	82.00%	81.00%	82.00%
Aeronautics Systems [Member] \| International(2)
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 665	$ 564	$ 1,857	$ 1,586
Sales percentage	19.00%	18.00%	18.00%	18.00%
Aeronautics Systems [Member] \| Other Customers [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 23	$ 6	$ 55	$ 17
Sales percentage	1.00%	0.00%	1.00%	0.00%
Aeronautics Systems [Member] \| Intersegment Sales [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 41	$ 42	$ 116	$ 121
Aeronautics Systems [Member] \| Operating Segments [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	3,575	3,142	10,377	9,070
Defense Systems [Member] \| US Government
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 1,934	$ 1,570	$ 5,263	$ 4,632
Sales percentage	86.00%	78.00%	86.00%	81.00%
Defense Systems [Member] \| International(2)
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 294	$ 419	$ 808	$ 1,013
Sales percentage	13.00%	21.00%	13.00%	18.00%
Defense Systems [Member] \| Other Customers [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 20	$ 19	$ 62	$ 61
Sales percentage	1.00%	1.00%	1.00%	1.00%
Defense Systems [Member] \| Intersegment Sales [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 59	$ 51	$ 166	$ 149
Defense Systems [Member] \| Operating Segments [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	2,307	2,059	6,299	5,855
Mission Systems [Member] \| US Government
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 2,244	$ 2,166	$ 6,403	$ 6,421
Sales percentage	81.00%	79.00%	80.00%	80.00%
Mission Systems [Member] \| International(2)
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 487	$ 557	$ 1,514	$ 1,537
Sales percentage	18.00%	20.00%	19.00%	19.00%
Mission Systems [Member] \| Other Customers [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 38	$ 31	$ 114	$ 84
Sales percentage	1.00%	1.00%	1.00%	1.00%
Mission Systems [Member] \| Intersegment Sales [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 386	$ 339	$ 1,235	$ 1,015
Mission Systems [Member] \| Operating Segments [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	3,155	3,093	9,266	9,057
Space Systems [Member] \| US Government
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 2,411	$ 2,366	$ 7,111	$ 7,024
Sales percentage	94.00%	93.00%	95.00%	93.00%
Space Systems [Member] \| International(2)
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 37	$ 63	$ 128	$ 154
Sales percentage	1.00%	2.00%	2.00%	2.00%
Space Systems [Member] \| Other Customers [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 123	$ 132	$ 215	$ 367
Sales percentage	5.00%	5.00%	3.00%	5.00%
Space Systems [Member] \| Intersegment Sales [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 178	$ 137	$ 528	$ 367
Space Systems [Member] \| Operating Segments [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]
Revenues	$ 2,749	$ 2,698	$ 7,982	$ 7,912