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Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Schedule of Comprehensive Income (Loss)
Year Ended December 31
(Dollars in millions)202120202019
Other Comprehensive (Loss) /Income1
Cumulative translation adjustments$(4)$15 $(34)
Pension liability, net of tax(4)(10)(10)
Total ending balance$(8)$5 $(44)
Deferred taxes on the pension liability1 3 3 
1The components of Other Comprehensive Loss are net of any related income tax effects.