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Postretirement Benefit Plans - Asset Allocation Range (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 31.00% | 36.00%
Minimum range | 30.00% |
Maximum range | 40.00% |
International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 24.00% | 29.00%
Minimum range | 20.00% |
Maximum range | 40.00% |
Fixed income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 43.00% | 35.00%
Minimum range | 25.00% |
Maximum range | 45.00% |
Cash and other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 2.00% | 0.00%
Minimum range | 0.00% |
Maximum range | 5.00% |

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