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Pension and Other Post-Employment Benefits (Estimate Of Benefit Payments For The Next 10 Years) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Year one $ 15
Year two 15
Year three 15
Year four 14
Year five 14
Thereafter 66
OPEB [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Year one 6
Year two 7
Year three 7
Year four 7
Year five 7
Thereafter $ 27