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Employee Benefit Plans - Expected Payments (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Postretirement Medical Plan |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |
2019 | $ 3
2020 | 3
2021 | 3
2022 | 3
2023 | 3
2024-2028 | 14
United Kingdom |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |
2019 | 40
2020 | 41
2021 | 43
2022 | 45
2023 | 46
2024-2028 | 257
Qualified Plan | United States |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |
2019 | 80
2020 | 83
2021 | 87
2022 | 89
2023 | 92
2024-2028 | 492
Nonqualified Plan | United States |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |
2019 | 5
2020 | 5
2021 | 5
2022 | 5
2023 | 5
2024-2028 | $ 25

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