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Contingent Liabilities (Tables)
3 Months Ended
Mar. 31, 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 March 31
(Dollars in millions)20212020
Reserve at beginning of the period$19 $15 
Change in reserve— 
Cash payments(1)(3)
Reserve at end of the period$18 $18