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Pension and Other Postretirement Benefit Plans - Summary of Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
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