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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, 2018 USD ($)
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Pension Benefits [Member] |
Expected Future Benefit Payments: |
2019 | $ 234
2020 | 233
2021 | 225
2022 | 223
2023 | 214
2024 - 2028 | 969
OPEB [Member] |
Expected Future Benefit Payments: |
2019 | 33
2020 | 32
2021 | 32
2022 | 31
2023 | 29
2024 - 2028 | 127
Expected Future Reductions Related to Medicare Prescription Drug, Improvement and Modernization Act of 2003: |
2019 | 2
2020 | 2
2021 | 2
2022 | 2
2023 | 2
2024 - 2028 | $ 13

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