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Income Taxes - Components of Federal and Foreign Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets related to: |  |
Accrued compensation and benefits | $ 595 | $ 1,012
Pensions | 2,495 | 5,197
Other postretirement benefit obligations | 153 | 302
Contract accounting methods | 487 | 878
Foreign company operating losses and credits | 27 | 30
Other | 154 | 327
Valuation allowance | (20) | (15)
Deferred tax assets, net | 3,891 | 7,731
Deferred tax liabilities related to: |  |
Goodwill and purchased intangibles | 266 | 378
Property, plant and equipment | 239 | 346
Exchanged debt securities and other | 303 | 418
Deferred tax liabilities | 808 | 1,142
Net deferred tax assets | $ 3,083 | $ 6,589

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