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Employee Benefit Plans Estimated Future Funding (Details) - Defined Benefit Pension Plan
$ in Millions
Dec. 31, 2019
USD ($)
Expected Future Benefit Payments, Fiscal Year Maturity  
2020 $ 9
2021 9
2022 9
2023 9
2024 9
2025 through 2029 45
Estimated minimum funding required during 2019 $ 8