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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Changes In Projected Benefit Obligation, Fair Value of Plan Assets And Funded Status Of Plan Changes in Benefit Obligations and Plan Assets
As of December 31
(Dollars in millions)20212020
Benefit obligation at beginning of year$60 $54 
Service cost4 4 
Interest cost1 1 
Actuarial gain(5)(7)
Benefits paid(5)(3)
Net of Held for sales add back/Divestiture— 7 
Translation difference— 4 
Benefit obligation at end of year$55 $60 
Fair value of plan assets at beginning of year$40 $37 
Actual return on plan assets5 3 
Company contributions3 3 
Benefits paid(5)(3)
Net of Held for sales add back/Divestiture— (1)
Translation difference(1)1 
Fair value of plan assets at year end$42 $40 
Funded status recognized in the balance sheet$(13)$(20)
Balance sheet classification
Other non-current assets$3 $— 
Pension liabilities(16)(20)
Net amount recorded$(13)$(20)
Schedule of Net Periodic Benefit Cost Components of Net Periodic Benefit Cost Associated with the Defined Benefit Retirement Plan
Year Ended December 31
(Dollars in millions)202120202019
Service cost$4 $4 $4 
Interest cost1 1 1 
Expected return on plan assets(2)(2)(2)
Amortization of actuarial loss1 1 1 
Net periodic benefit cost$4 $4 $4 
Schedule of Amounts Recognized In Other Comprehensive Income (Loss)
Components of Accumulated other Comprehensive Income Before Tax
As of December 31
(Dollars in millions)20212020
Net actuarial loss$6 $15 
Prior service cost1 — 
Total accumulated other comprehensive loss recognized in the balance sheet$7 $15 
Changes in Accumulated Other Comprehensive Income Before Tax
As of December 31
(Dollars in millions)20212020
Total retirement benefit recognized in accumulated other comprehensive income at beginning of year$15 $13 
Held for sale— — 
Add back Held for sale— (2)
Effect of plan combinations— 11 
Net actuarial gain(7)(8)
Amortization of actuarial loss(1)(1)
Translation difference— 2 
Total retirement benefit recognized in accumulated other comprehensive income at end of year$7 $15 
Schedule of Accumulated And Projected Benefit Obligations In Excess Of Fair Value Pension Plans for Which Accumulated Benefit Obligation (ABO) Exceeds the Fair Value of Plan Assets
As of December 31
(Dollars in millions)20212020
Projected Benefit Obligation (PBO)$16 $60 
Accumulated Benefit Obligation$12 $54 
Fair value of plan assets$— $40 
Schedule of Assumptions Used Assumptions Used to Determine the Benefit Obligation
As of December 31
20212020
Weighted average
Discount rate2.8 %2.32 %
Rate of increases in compensation level3.3 %3.3 %
 Assumptions Used to Determine the Net Periodic Benefit Cost for Years Ended December 31
Year Ended December 31
202120202019
Weighted average
Discount rate2.32 %1.86 %2.14 %
Rate of increases in compensation level3.28 %4.33 %4.39 %
Expected long-term rate of return on assets5.77 %3.76 %3.49 %
Schedule of Allocation Of Plan Assets
Fair Value of Total Plan Assets
As of December 31
ASSETS CATEGORY IN % WEIGHTED AVERAGE20212020
Equity securities64 %65 %
Debt instruments21 %22 %
Other assets15 %13 %
Total100 %100 %
The following table summarizes the fair value of the defined benefit pension plan assets:
As of December 31
(Dollars in millions)20212020
Assets
Equity
U.S. Large Cap$7 $6 
Non-U.S. Equity20 20 
Non-U.S. Bonds
Corporate2 4 
Aggregate7 5 
Other Investments6 5 
Total$42 $40 
Schedule of Expected Benefit Payments
Pension Benefits Expected Payments (Dollars in millions)
Amount
2022$2 
2023$3 
2024$3 
2025$3 
2026$3 
Years 2027-2031$19