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Share-based Compensation and Employee Benefits (Schedule of Components of Accumulated Other Comprehensive (Loss) Income) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Unrecognized net actuarial (loss) gain $ (653) $ (635)
Unrecognized prior service (cost) credit (3) (4)
Accumulated other comprehensive (loss) income (656) (639)
OPEB [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Unrecognized net actuarial (loss) gain 117 88
Unrecognized prior service (cost) credit 14 17
Accumulated other comprehensive (loss) income $ 131 $ 105