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Leases (Tables)
 6 Months Ended
Jun. 30, 2024
Leases [Abstract]  
Summary of Components of Lease Expense
The components of lease expense are as follows:
Three Months Ended
June 30,
Six Months Ended
June 30,
2024202320242023
(Dollars in millions)
Operating lease cost$4$4$7$8
Summary of Supplemental Cash Flow Information Related to Operating Leases
Supplemental cash flow information related to operating leases is as follows:
Three Months Ended
June 30,
Six Months Ended
June 30,
2024202320242023
(Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases
$3 $3 $6 $7 
Right-of-use assets obtained in exchange for lease obligations:
Operating leases3 2 9 2 
Summary of Supplemental Balance Sheet Information Related to Operating Leases
Supplemental balance sheet information related to operating leases is as follows:
June 30,
2024		December 31,
2023
(Dollars in millions)
Other assets$45 $40 
Accrued liabilities9 9 
Other liabilities37 33 
 June 30,
2024		December 31, 2023
Weighted-average remaining lease term (in years)7.448.08
Weighted-average discount rate5.98 %5.69 %
Schedule of Maturities of Operating Lease Liabilities
Maturities of operating lease liabilities as of June 30, 2024 were as follows:
(Dollars in millions)
2024$8 
202510 
20269 
20278 
20286 
Thereafter17 
Total lease payments58 
Less imputed interest(12)
$46