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Income Taxes - Components of Federal and Foreign Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets related to: |  |
Pensions | $ 1,985 | $ 2,994
Accrued compensation and benefits | 957 | 926
Contract accounting methods | 470 | 392
Foreign company operating losses and credits | 40 | 51
Other | 473 | 509
Valuation allowance | (15) | (13)
Deferred tax assets, net | 3,910 | 4,859
Deferred tax liabilities related to: |  |
Goodwill and intangible assets | 401 | 363
Property, plant and equipment | 518 | 481
Exchanged debt securities and other | 709 | 547
Deferred tax liabilities | 1,628 | 1,391
Net deferred tax assets | $ 2,282 | $ 3,468

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