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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

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