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Employee Benefit Plans - Plan's Assets Carried 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] |  |  |
Total Fair Value Measurements | $ 706 | $ 517 |
Equity securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 296 | 204 |
Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 172 | 139 |
Other Contract [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 238 | 174 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements |  |  |
Fair Value, Inputs, Level 1 [Member] | Equity securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements |  |  |
Fair Value, Inputs, Level 1 [Member] | Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements |  |  |
Fair Value, Inputs, Level 1 [Member] | Other Contract [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 599 | 417 |
Fair Value, Inputs, Level 2 [Member] | Equity securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 296 | 204 |
Fair Value, Inputs, Level 2 [Member] | Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 172 | 139 |
Fair Value, Inputs, Level 2 [Member] | Other Contract [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 131 | 74 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 107 | 100 | 77
Fair Value, Inputs, Level 3 [Member] | Equity securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements |  |  |
Fair Value, Inputs, Level 3 [Member] | Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements |  |  |
Fair Value, Inputs, Level 3 [Member] | Other Contract [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | $ 107 | $ 100 |

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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=35743120&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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