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Pension and Postretirement Plans (Summary of Future Service Benefit Payments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits | United States  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 538
2021 309
2022 320
2023 284
2024 289
2025-2029 1,198
Pension Benefits | Int’l.  
Defined Benefit Plan Disclosure [Line Items]  
2020 21
2021 23
2022 25
2023 27
2024 29
2025-2029 176
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 26
2021 27
2022 27
2023 26
2024 24
2025-2029 $ 96