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Schedule of Pension Plan Assets at Fair Value (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Money market funds | $ 3 | $ 2 |
Equity funds | 26 | 27 |
Bond/fixed-income funds | 28 | 25 |
Real-estate indirect investment | 5 | 4 |
Commodities/Other | 4 | 3 |
Insurance contracts | 10 | 8 | 7
Total Assets at fair value | 76 | 69 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Money market funds | 0 | 0 |
Equity funds | 0 | 0 |
Bond/fixed-income funds | 0 | 0 |
Real-estate indirect investment | 0 | 0 |
Commodities/Other | 0 | 0 |
Insurance contracts | 0 | 0 |
Total Assets at fair value | 0 | 0 |
Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Money market funds | 3 | 2 |
Equity funds | 26 | 27 |
Bond/fixed-income funds | 28 | 25 |
Real-estate indirect investment | 5 | 4 |
Commodities/Other | 4 | 3 |
Insurance contracts | 0 | 0 |
Total Assets at fair value | 66 | 61 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Money market funds | 0 | 0 |
Equity funds | 0 | 0 |
Bond/fixed-income funds | 0 | 0 |
Real-estate indirect investment | 0 | 0 |
Commodities/Other | 0 | 0 |
Insurance contracts | 10 | 8 |
Total Assets at fair value | $ 10 | $ 8 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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