Segment and Revenue Information - Components of Financial Accounting Standards and Cost Accounting Standards Adjustment (Details) - Other - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
FAS/CAS service cost adjustment	$ 1,045	$ 1,104	$ 1,056
Pension
Segment Reporting Information [Line Items]
FAS/CAS service cost adjustment	784	811	799
Other Postretirement Benefits
Segment Reporting Information [Line Items]
FAS/CAS service cost adjustment	$ 261	$ 293	$ 257