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Share-based Compensation and Employee Benefits (Components of Funded Status) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Non-current benefit asset | $ 0 | $ 0
Current benefit liability | 0 | 0
Non-current benefit liability | (702) | (686)
Funded status - net liability at December 31, | (702) | (686)
OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Non-current benefit asset | 190 | 198
Current benefit liability | (13) | (15)
Non-current benefit liability | (210) | (273)
Funded status - net liability at December 31, | (33) | (90)
OPEB [Member] | Other Affiliates [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Non-current benefit asset | $ 32 | $ 33

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