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Reclassifications From Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance, December 31, 2016 $ (39)
Other comprehensive income before reclassifications
Amounts reclassified from other comprehensive income 2
Net current-period other comprehensive income 2
Ending balance, September 30, 2017 (37)
Pension And Other Postretirement [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance, December 31, 2016 (19)
Other comprehensive income before reclassifications
Amounts reclassified from other comprehensive income 2
Net current-period other comprehensive income 2
Ending balance, September 30, 2017 (17)
Foreign Currency [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance, December 31, 2016 (20)
Other comprehensive income before reclassifications
Amounts reclassified from other comprehensive income
Net current-period other comprehensive income
Ending balance, September 30, 2017 $ (20)