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Pension and Other Postretirement Benefit Plans - Summary of Expected Benefit Payments (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2018 | $ 96
2019 | 101
2020 | 104
2021 | 109
2022 | 113
2023 — 2027 | 623
United States | Pension Plan |
Defined Benefit Plan Disclosure [Line Items] |
2018 | 609
2019 | 638
2020 | 650
2021 | 663
2022 | 683
2023 — 2027 | 3,760
International | Pension Plan |
Defined Benefit Plan Disclosure [Line Items] |
2018 | 222
2019 | 205
2020 | 217
2021 | 225
2022 | 243
2023 — 2027 | $ 1,326

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