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Income Taxes - Components of Federal and Foreign Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets related to: |  |
Accrued compensation and benefits | $ 584 | $ 595
Pensions | 2,623 | 2,495
Other postretirement benefit obligations | 148 | 153
Contract accounting methods | 539 | 531
Foreign company operating losses and credits | 38 | 27
Other | 160 | 154
Valuation allowance | (20) | (20)
Deferred tax assets, net | 4,072 | 3,935
Deferred tax liabilities related to: |  |
Goodwill and purchased intangibles | 296 | 266
Property, plant and equipment | 296 | 239
Exchanged debt securities and other | 294 | 303
Deferred tax liabilities | 886 | 808
Net deferred tax assets | $ 3,186 | $ 3,127

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