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Contingent Liabilities (Tables)
6 Months Ended
Jun. 30, 2021
Loss Contingency [Abstract]  
Schedule of change in balance sheet position of product related liabilities
The table below summarizes the change in product related liabilities in the unaudited Condensed Consolidated Balance Sheet.
 Three Months Ended June 30Six Months Ended June 30
(Dollars in millions)2021202020212020
Reserve at beginning of the period$18 $18 $19 $15 
Change in reserve
Cash payments(2)(1)(3)(3)
Reserve at end of the period$18 $18 $18 $18