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Employee Retirement Plans (Estimated Future Benefit Payments and Gross Medicare to be Received) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits [Member] | United States [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 207
2021 214
2022 223
2023 233
2024 239
2025-2029 1,299
Pension Benefits [Member] | International [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 25
2021 33
2022 30
2023 30
2024 34
2025-2029 210
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 34
2021 37
2022 37
2023 37
2024 37
2025-2029 $ 190