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Employee Benefit Plans Estimated Future Benefit Payments (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 5
2019 5
2020 5
2021 6
2022 6
2023-2026 34
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 7
2019 6
2020 6
2021 6
2022 6
2023-2026 $ 24