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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting, Asset Reconciling Item [Line Items]
FAS/CAS service cost adjustment	$ 228	$ 281	$ 832	$ 863
Pension FAS/CAS service cost adjustment
Segment Reporting, Asset Reconciling Item [Line Items]
FAS/CAS service cost adjustment	148	218	608	663
Postretirement FAS/CAS service cost adjustment
Segment Reporting, Asset Reconciling Item [Line Items]
FAS/CAS service cost adjustment	$ 80	$ 63	$ 224	$ 200