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Postretirement Benefit Plans - Asset Allocation Range (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 22.00% | 26.00%
International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 8.00% | 22.00%
Fixed income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 68.00% | 51.00%
Cash and other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 2.00% | 1.00%
Minimum [Member] | U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0 |
Minimum [Member] | International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0 |
Minimum [Member] | Fixed income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0.5 |
Minimum [Member] | Cash and other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0.00 |
Maximum [Member] | U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0.5 |
Maximum [Member] | International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0.25 |
Maximum [Member] | Fixed income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 1 |
Maximum [Member] | Cash and other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0.1 |

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- Definition Description of target allocation percentages, or range of percentages, considering the major categories of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that are pertinent to an understanding of the plan investment policies and strategies. + 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 (d)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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