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Retirement Benefits (Schedule of Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
United States  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 5
2021 5
2022 5
2023 5
2024 5
Years 2025 - 2029 24
Int’l  
Defined Benefit Plan Disclosure [Line Items]  
2020 57
2021 59
2022 60
2023 61
2024 63
Years 2025 - 2029 $ 333