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
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items]
FAS/CAS service cost adjustment	$ 302	$ 291
Pension FAS/CAS service cost adjustment
Segment Reporting, Asset Reconciling Item [Line Items]
FAS/CAS service cost adjustment	230	223
Postretirement FAS/CAS service cost adjustment
Segment Reporting, Asset Reconciling Item [Line Items]
FAS/CAS service cost adjustment	$ 72	$ 68