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Reclassifications from Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, December 31, 2017   $ (44)  
Other comprehensive income (loss) before reclassifications    
Amounts reclassified from other comprehensive income (loss)    
Net current-period other comprehensive income (loss) $ 1 $ 1
Ending balance, June 30, 2018   (44)  
Pension And Other Postretirement [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, December 31, 2017   (30)  
Other comprehensive income (loss) before reclassifications    
Amounts reclassified from other comprehensive income (loss)    
Net current-period other comprehensive income (loss)    
Ending balance, June 30, 2018   (30)  
Foreign Currency [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, December 31, 2017   (14)  
Other comprehensive income (loss) before reclassifications    
Amounts reclassified from other comprehensive income (loss)    
Net current-period other comprehensive income (loss)    
Ending balance, June 30, 2018   $ (14)