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Employee Benefit Plans - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 155
2020 157
2021 159
2022 162
2023 162
2024 - 2028 836
U.S. Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 105
2020 107
2021 110
2022 112
2023 114
2024 - 2028 581
International Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 50
2020 50
2021 49
2022 50
2023 48
2024 - 2028 255
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 2
2020 2
2021 2
2022 1
2023 1
2024 - 2028 4
Postemployment Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 30
2020 20
2021 19
2022 17
2023 16
2024 - 2028 $ 66