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Employment Benefit Plans Expected Benefit Payments (Details) - Pension Benefits
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Expected benefit payments, 2020 $ 156
Expected benefit payments, 2021 144
Expected benefit payments, 2022 140
Expected benefit payments, 2023 136
Expected benefit payments, 2024 132
Expected benefit payments, 2025 - 2029 $ 620