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Pension and Postretirement Benefit Plans and Defined Contribution Plans - Expected Future Cash Flow Information (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Postretirement Benefits Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions in 2019 | $ 160
Expected benefit payments: |
2019 | 166
2020 | 171
2021 | 171
2022 | 168
2023 | 165
2024-2028 | 777
United States [Member] | Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions in 2019 | 11
Expected benefit payments: |
2019 | 1,387
2020 | 1,089
2021 | 1,058
2022 | 1,020
2023 | 1,018
2024-2028 | 4,837
United States [Member] | U.S. Supplemental (Non-Qualified) Pension Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions in 2019 | 167
Expected benefit payments: |
2019 | 167
2020 | 121
2021 | 114
2022 | 113
2023 | 103
2024-2028 | 445
Foreign Plan [Member] | Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected contributions in 2019 | 177
Expected benefit payments: |
2019 | 354
2020 | 372
2021 | 380
2022 | 385
2023 | 387
2024-2028 | $ 2,068

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