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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 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
Beginning balance, December 31, 2017       $ (44)             $ (44)    
Other comprehensive (loss) before reclassifications                     (2)    
Amounts reclassified from other comprehensive income                     10    
Net current-period other comprehensive income $ 4 $ 4 $ (7) $ 1 $ 1 $ 2 $ 3 $ 4 8 $ (5) $ 9
Ending balance, December 31, 2018 (36)       (44)           (36) (44)  
Pension And Other Postretirement [Member]                          
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
Beginning balance, December 31, 2017       (30)             (30)    
Other comprehensive (loss) before reclassifications                     (2)    
Amounts reclassified from other comprehensive income                     10    
Net current-period other comprehensive income                     8    
Ending balance, December 31, 2018 (22)       (30)           (22) (30)  
Foreign Currency [Member]                          
Accumulated Other Comprehensive Income (Loss) [Line Items]                          
Beginning balance, December 31, 2017       $ (14)             (14)    
Other comprehensive (loss) before reclassifications                        
Amounts reclassified from other comprehensive income                        
Net current-period other comprehensive income                        
Ending balance, December 31, 2018 $ (14)       $ (14)           $ (14) $ (14)