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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