Segment and Revenue Information - Components of Financial Accounting Standards and Cost Accounting Standards Adjustment (Details) - Unallocated items, eliminations and other - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
FAS/CAS service cost adjustment	$ 268	$ 228	$ 787	$ 832
Pension Plans
Segment Reporting, Asset Reconciling Item [Line Items]
FAS/CAS service cost adjustment	198	148	588	608
Other Postretirement Plans
Segment Reporting, Asset Reconciling Item [Line Items]
FAS/CAS service cost adjustment	$ 70	$ 80	$ 199	$ 224