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Employee Retirement Plans (Estimated Future Benefit Payments and Gross Medicare to be Received) (Details) $ in Millions | Dec. 31, 2018 USD ($)
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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

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