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Employee Benefit Plans - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2016 $ 157
2017 161
2018 161
2019 164
2020 166
2021 - 2025 846
U.S. Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2016 104
2017 107
2018 109
2019 112
2020 114
2021 - 2025 581
International Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2016 53
2017 54
2018 52
2019 52
2020 52
2021 - 2025 265
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2016 2
2017 2
2018 2
2019 2
2020 2
2021 - 2025 5
Postemployment Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2016 60
2017 22
2018 21
2019 20
2020 18
2021 - 2025 $ 76