v3.6.0.2

Postretirement Benefit Plans - Summary of Actual Pension Plan Asset Allocation (Detail) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |
Actual benefit plan asset allocation | 100.00% | 100.00%
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual benefit plan asset allocation | 29.00% | 29.00%
Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual benefit plan asset allocation | 52.00% | 55.00%
Insurance Contracts [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual benefit plan asset allocation | 7.00% | 6.00%
Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual benefit plan asset allocation | 12.00% | 10.00%

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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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