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Share-based Compensation and Employee Benefits - Schedule of Expected Payment of Future Benefits and Employer Contributions (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Pension Benefits |
Expected Future Benefit Payments: |
2021 | $ 239
2022 | 238
2023 | 225
2024 | 219
2025 | 211
2026 - 2030 | 902
OPEB |
Expected Future Benefit Payments: |
2021 | 30
2022 | 28
2023 | 27
2024 | 25
2025 | 23
2026 - 2030 | 94
Expected Future Reductions Related to Medicare Prescription Drug, Improvement and Modernization Act of 2003: |
2021 | 1
2022 | 1
2023 | 1
2024 | 1
2025 | 1
2026 - 2030 | $ 6

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