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Long-Term Debt (Schedule Of Maturities On Long-Term Debt) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
Long-term debt, excluding associated hedges $ 383
2013 0
2014 1
2015 0
2016 0
2017 0
Thereafter 382
Parent Company [Member]  
Debt Instrument [Line Items]  
Long-term debt, excluding associated hedges 382
2013 0
2014 0
2015 0
2016 0
2017 0
Thereafter $ 382