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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
FAS/CAS service cost adjustment	$ 291	$ 284	$ 582	$ 567
Pension FAS/CAS service cost adjustment
Segment Reporting, Asset Reconciling Item [Line Items]
FAS/CAS service cost adjustment	222	205	445	413
Postretirement FAS/CAS service cost adjustment
Segment Reporting, Asset Reconciling Item [Line Items]
FAS/CAS service cost adjustment	$ 69	$ 79	$ 137	$ 154