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Employee Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | $ 543 | $ 601 |
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 181 | 186 |
Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 262 | 259 |
Other Contract [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 100 | 156 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 490 | 502 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 181 | 186 |
Fair Value, Inputs, Level 2 [Member] | Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 262 | 259 |
Fair Value, Inputs, Level 2 [Member] | Other Contract [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 47 | 57 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | 53 | 99 | $ 108
Fair Value, Inputs, Level 3 [Member] | Other Contract [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value Measurements | $ 53 | $ 99 |

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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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: 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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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