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Retirement and Employee Benefit Plans (Schedule of Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 6
2019 6
2020 7
2021 8
2022 8
Years 2023-2027 52
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 1
2019 1
2020 1
2021 1
2022 1
Years 2023-2027 $ 7