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Employee Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | $ 588 | $ 543 |
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 161 | 181 |
Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 284 | 262 |
Other Contract [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 143 | 100 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 527 | 490 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 161 | 181 |
Fair Value, Inputs, Level 2 [Member] | Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 284 | 262 |
Fair Value, Inputs, Level 2 [Member] | Other Contract [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 82 | 47 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 61 | 53 | $ 99
Fair Value, Inputs, Level 3 [Member] | Other Contract [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | $ 61 | $ 53 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=82843861&loc=d3e1928-114920 + Details
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