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Leases (Tables)
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
Lease, Cost
The components of lease expense were as follows:
Year Ended December 31
(Dollars in millions)20212020
Operating lease cost$24 $24 
Finance lease cost
     Amortization of right-of-use assets6 4 
     Interest on lease liabilities2 2 
Total finance lease cost8 6 
Short-term lease cost1 1 
Total lease cost
$33 $31 
Other information related to leases was as follows:
Supplemental Cash Flows InformationYear Ended December 31
(Dollars in millions)20212020
Cash paid for amounts included in the measurement of lease liabilities
     Operating cash flows used for operating leases$23 $23 
     Operating cash flows used for finance leases2 2 
     Financing cash flows used for finance leases4 2 
Right-of-use assets obtained in exchange for new lease obligations:
     Operating leases22 17 
     Finance leases6 17 
As of December 31
(Lease term in years and discount rate)20212020
Weighted-average remaining lease term
Operating Leases67
Finance Leases910
Weighted-average discount rate
Operating leases3.4 %3.4 %
Finance leases4.88 %4.95 %
Lessee, Operating Lease, Liability, Maturity Future minimum lease payments under non-cancellable leases as of December 31, 2021 were as follows:
(Dollars in millions) Operating Leases Finance Leases
2022$22 $9 
202319 9 
202412 10 
20259 4 
20267 4 
Thereafter22 27 
Total lease payments91 63 
Less imputed interest9 13 
Total lease liabilities$82 $50 
Finance Lease, Liability, Maturity Future minimum lease payments under non-cancellable leases as of December 31, 2021 were as follows:
(Dollars in millions) Operating Leases Finance Leases
2022$22 $9 
202319 9 
202412 10 
20259 4 
20267 4 
Thereafter22 27 
Total lease payments91 63 
Less imputed interest9 13 
Total lease liabilities$82 $50 
Lessee, Lease, Components of Financial Position Lease obligations reported as of December 31, 2021 were as follows:
(Dollars in millions) Operating LeasesFinance Leases
Other current liabilities$20 $7 
Lease liabilities - non current62 43 
Total lease liabilities$82 $50