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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

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