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Pension and Other Benefit Programs - Payments Projected Based on Actuarial Assumptions (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 $ 49
2021 50
2022 49
2023 49
2024 49
Next 5 years 243
Post-retirement Benefit Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 8
2021 8
2022 8
2023 8
2024 8
Next 5 years $ 39