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Casualty, Environmental and Other Reserves (Tables)
 6 Months Ended
Jun. 30, 2020
Casualty, Environmental and Other Reserves [Abstract]  
Schedule of Casualty, Environmental and Other Reserves Casualty, environmental and other reserves are provided for in the consolidated balance sheets as shown in the table below.
June 30, 2020December 31, 2019
(Dollars in millions)CurrentLong-termTotalCurrentLong-termTotal
Casualty:
Personal Injury$44  $83  $127  $42  $87  $129  
Occupational9  52  61  6  52  58  
     Total Casualty53  135  188  48  139  187  
Environmental30  45  75  31  43  74  
Other20  23  43  21  23  44  
     Total$103  $203  $306  $100  $205  $305