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Retirement and Employee Benefit Plans (Schedule of Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 5
2021 5
2022 6
2023 6
2024 7
Years 2025-2029 34
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 1
2021 1
2022 1
2023 1
2024 1
Years 2025-2029 $ 5