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Investment And Other Income, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Investment And Other Income, Net [Abstract]  
Components Of Investment And Other Income, Net

 
For the year ended December 31,
  
($ in millions)
  
2019
    
2018
    
2017
  
                   
Interest and dividend income
  
$
9
    
$
6
    
$
6
  
Pension and OPEB benefit (costs)
    
(42
)
    
10
      
(2
)
All other, net
    
(4
)
    
(3
)
    
(3
)
Total investment and other income (loss), net
  
$
(37
)
  
$
13
    
$
1