Income Taxes - Components of Federal and Foreign Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets related to:
Pensions	$ 1,340	$ 1,985
Accrued compensation and benefits	718	957
Contract accounting methods	510	470
Research and development expenditures	2,268	0
Foreign company operating losses and credits	20	40
Other	471	473
Valuation allowance	(31)	(15)
Deferred tax assets, net	5,296	3,910
Deferred tax liabilities related to:
Goodwill and intangible assets	449	401
Property, plant and equipment	503	518
Exchanged debt securities and other	605	709
Deferred tax liabilities	1,557	1,628
Net deferred tax assets	$ 3,739	$ 2,282