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Benefit Plans - Future amortization amounts (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Pension benefits |
Estimates of the net actuarial loss (gain) and prior service credit expected to be recognized as a component of net periodic benefit cost during 2015 |
Net actuarial loss (gain) | $ 177
Prior service credit | (56)
Postretirement benefits |
Estimates of the net actuarial loss (gain) and prior service credit expected to be recognized as a component of net periodic benefit cost during 2015 |
Net actuarial loss (gain) | (22)
Prior service credit | $ (22)

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