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Benefit Plans - Postretirement benefit payments (Details) - Postemployment Retirement Benefits $ in Millions	Dec. 31, 2018 USD ($)
Expected future benefit payments
2019	$ 4
2020	4
2021	4
2022	5
2023	5
Years 2024 - 2028	$ 23

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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

+ References

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Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

+ References

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Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year.

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