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Employee Retirement Plans (Estimated Future Benefit Payments and Gross Medicare to be Received) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Benefits [Member] | United States [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 216
2022 221
2023 231
2024 238
2025 247
2026-2030 1,312
Pension Benefits [Member] | International [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 25
2022 31
2023 30
2024 32
2025 35
2026-2030 219
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 37
2022 37
2023 37
2024 37
2025 37
2026-2030 $ 188