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Components of Federal and Foreign Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets related to: |  |  |
Accrued compensation and benefits |  | $ 1,012 | $ 919
Pensions | [1] | 5,197 | 4,462
Other postretirement benefit obligations |  | 302 | 375
Contract accounting methods |  | 878 | 1,039
Foreign company operating losses and credits |  | 30 | 62
Other |  | 327 | 418
Valuation allowance | [2] | (15) | (73)
Deferred tax assets, net |  | 7,731 | 7,202
Deferred tax liabilities related to: |  |  |
Goodwill and purchased intangibles |  | 378 | 274
Property, plant and equipment |  | 346 | 457
Exchanged debt securities and other | [3] | 418 | 408
Deferred tax liabilities |  | 1,142 | 1,139
Net deferred tax assets |  | $ 6,589 | $ 6,063
[1] | The increase in 2016 was primarily due to the reduction in the discount rate used to measure our postretirement benefit plans (see "Note 11 - Postretirement Plans").
[2] | A valuation allowance was provided against certain foreign company deferred tax assets arising from carryforwards of unused tax benefits.
[3] | Includes deferred taxes associated with the exchange of debt securities in prior years.

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 + Details
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