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Asset Impairment Expense (Tables)
6 Months Ended
Jun. 30, 2020
Impairment or Disposal of Tangible Assets Disclosure [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]
The following table presents our asset impairment expense by asset group for the periods indicated (in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2020
 
2019
 
2020
 
2019
Kilroot and Ballylumford
$

 
$
115

 
$

 
$
115

Other

 
1

 
6

 
1

Total
$

 
$
116

 
$
6

 
$
116