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Amounts Expected to be Amortized from AOCI to Net Periodic Benefit Cost in 2018 (Detail) $ in Millions | Dec. 31, 2017 USD ($)
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Pension benefits |
Defined Benefit Plan Disclosure [Line Items] |
Actuarial loss/(gain) | $ 174
Prior service credit and transition obligation | (1)
Total pre-tax amount expected to be amortized from AOCI to net pension and OPEB cost in 2018 | 173
OPEB |
Defined Benefit Plan Disclosure [Line Items] |
Actuarial loss/(gain) | (10)
Prior service credit and transition obligation | (15)
Total pre-tax amount expected to be amortized from AOCI to net pension and OPEB cost in 2018 | $ (25)

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