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Retirement Benefits (Benefit Payments) (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2021 | $ 18
2022 | 18
2023 | 16
2024 | 15
2025 | 14
2026-2030 | 58
Defined Benefit Plan, Funded Plan | Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2021 | 3
2022 | 4
2023 | 4
2024 | 4
2025 | 2
2026-2030 | 12
Defined Benefit Plan, Unfunded Plan | Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2021 | 5
2022 | 4
2023 | 4
2024 | 3
2025 | 3
2026-2030 | $ 9

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