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Amortized Accumulated Other Comprehensive Income (Loss) Into Net Periodic Benefit Cost (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Actuarial (gain) loss | $ 127
Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Actuarial (gain) loss | (36)
Prior service credit | $ (37)

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