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Income Taxes - Components of Federal and Foreign Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets related to: |  |
Accrued compensation and benefits | $ 659 | $ 584
Pensions | 3,057 | 2,623
Other postretirement benefit obligations | 71 | 148
Contract accounting methods | 349 | 539
Foreign company operating losses and credits | 49 | 38
Other | 345 | 160
Valuation allowance | (28) | (20)
Deferred tax assets, net | 4,502 | 4,072
Deferred tax liabilities related to: |  |
Goodwill and purchased intangibles | 330 | 296
Property, plant and equipment | 340 | 296
Exchanged debt securities and other | 525 | 294
Deferred tax liabilities | 1,195 | 886
Net deferred tax assets | $ 3,307 | $ 3,186

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