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Postretirement Benefit Plans - Asset Allocation Range (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
U.S. equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 0.00% | 18.00%
International equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 0.00% | 9.00%
Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 74.00% | 72.00%
Cash and other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 26.00% | 1.00%
Minimum [Member] | U.S. equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0 |
Minimum [Member] | International equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0 |
Minimum [Member] | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0.5 |
Minimum [Member] | Cash and other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0.00 |
Maximum [Member] | U.S. equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0.5 |
Maximum [Member] | International equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0.25 |
Maximum [Member] | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 1 |
Maximum [Member] | Cash and other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation Range | 0.1 |

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- Definition Description of investment policy and strategy for defined benefit plan asset. Includes, but is not limited to, investment allocation decision and factor pertinent to understanding investment policy and strategy for plan asset. Factor includes, but is not limited to, investment goal, risk management practice, permitted and prohibited investment including use of derivative, diversification, and relationship between plan asset and obligation. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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