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Pension and Other Postretirement Plans - Estimated Future Benefit Payments (Details) $ in Millions	Dec. 31, 2019 USD ($)
Pension Benefits
Pension and Other Postretirement
2020	$ 361
2021	386
2022	399
2023	410
2024	399
Years 2025 – 2029	2,219
Other Postretirement Benefits
Pension and Other Postretirement
2020	53
2021	56
2022	59
2023	62
2024	64
Years 2025 – 2029	$ 328

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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.

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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 fourth fiscal year following latest fiscal year.

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