Segment and Revenue Information - Components of Financial Accounting Standards and Cost Accounting Standards Adjustment (Details) - Other - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
FAS/CAS service cost adjustment	$ 1,056	$ 1,143	$ 1,173
Pension
Segment Reporting Information [Line Items]
FAS/CAS service cost adjustment	799	849	882
Other Postretirement Benefits
Segment Reporting Information [Line Items]
FAS/CAS service cost adjustment	$ 257	$ 294	$ 291