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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 ($)
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