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Employee Retirement Plans (Estimated Future Benefit Payments and Gross Medicare to be Received) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Benefits [Member] | United States [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 199
2020 203
2021 212
2022 220
2023 229
2024-2028 1,242
Pension Benefits [Member] | International [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 23
2020 30
2021 28
2022 31
2023 30
2024-2028 196
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 37
2020 40
2021 40
2022 42
2023 42
2024-2028 $ 213