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Employee Benefit Plans - Schedule of Future Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Plans  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2018 $ 198
2019 193
2020 189
2021 186
2022 183
2023-2026 888
Total 1,837
Post-retirement Medical Plan  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2018 38
2019 28
2020 26
2021 24
2022 22
2023-2026 76
Total $ 214