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Commitment and Contingencies (Tables)
3 Months Ended
Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability The following is a summary of changes in the product warranty balances during the period ended March 31, 2021:
(Dollars in millions)
Balance at December 31, 2020$17 
Additional provision
Reversal and utilization(3)
Balance at March 31, 202119