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Casualty, Environmental and Other Reserves (Tables)
 9 Months Ended
Sep. 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.
September 30, 2020December 31, 2019
(Dollars in millions)CurrentLong-termTotalCurrentLong-termTotal
Casualty:
Personal Injury$44 $85 $129 $42 $87 $129 
Occupational9 54 63 6 52 58 
     Total Casualty53 139 192 48 139 187 
Environmental30 44 74 31 43 74 
Other21 22 43 21 23 44 
     Total$104 $205 $309 $100 $205 $305