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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Change in Product Related Liabilities
The table below summarizes the change in product related liabilities in the Consolidated Balance Sheets.
As of December 31
(Dollars in millions)20192018
Reserve at beginning of the year$16  $22  
Change in reserve 10  
Cash settlements(2) (15) 
Transfers—  (1) 
Reserve at end of the year$15  $16