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Goodwill and Intangible Assets (Schedule Of Other Intangible Asset Balances For Continuing Operations) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]    
Gross $ 347 $ 345
Accumulated Amortization (192) (187)
Net 155 158
Customer relationships [Member]    
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]    
Gross 173 173
Accumulated Amortization (167) (165)
Net 5 7
Other [Member]    
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]    
Gross 34 32
Accumulated Amortization (25) (22)
Net 9 10
Trade names [Member]    
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]    
Gross [1] 140 140
Accumulated Amortization [1]
Net [1] $ 140 $ 140
[1] Not subject to amortization.