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Pension and Postretirement Benefits - Additional Information (Detail) - USD ($) | 1 Months Ended |
--- | --- | ---
Jul. 31, 2018 | Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Estimated contribution to pension plans |  | $ 162,400,000
Underfunded Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Estimated contribution to pension plans |  | 12,400,000
Qualified Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Estimated contribution to pension plans |  | $ 150,000,000
Qualified Pension Plan [Member] | Subsequent Event [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution made to qualified pension plans | $ 75,000,000 |

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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 Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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