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Expected Net Pension and OPEB Plan Payments for Next 10 Years (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Pension benefits  
Expected Net Pension and OPEB Plan Payments for the Next 10 Years  
2018 $ 250
2019 260
2020 271
2021 283
2022 294
2023 through 2027 1,626
Total expected net benefit payments for next 10 years 2,984
OPEB  
Expected Net Pension and OPEB Plan Payments for the Next 10 Years  
2018 20
2019 19
2020 18
2021 17
2022 17
2023 through 2027 73
Total expected net benefit payments for next 10 years $ 164