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Commitment and Contingencies (Tables)
9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Restructuring and Related Costs
(Dollars in millions)
Balance at December 31, 2020$
Additional provision
Reversal and utilization— 
Balance as of September 30, 2021$
Schedule of Product Warranty Liability The following is a summary of changes in the product warranty balances during the period ended September 30, 2021:
(Dollars in millions)
Balance as of December 31, 2020$17 
Additional provision12 
Reversal and utilization(11)
Balance as of September 30, 202118