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Leases (Tables) | 12 Months Ended
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Dec. 31, 2024
Leases [Abstract] |
Components of lease expense | The following table shows the components of lease cost included in the Consolidated Statement of Operations:
Year Ended December 31, | 2024 |  | 2023 |  | 2022
(Dollars in millions) |  |  |  |  |
Operating lease cost | $ | 198 |  |  | $ | 191 |  |  | $ | 188 |
Variable lease cost | 13 |  |  | 12 |  |  | 11 |
Total | $ | 211 |  |  | $ | 203 |  |  | $ | 199 |
Supplemental cash flow information related to leases | The following table shows supplemental cash flow information related to lease activities:
Year Ended December 31, | 2024 |  | 2023 |  | 2022
(Dollars in millions) |  |  |  |  |
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |
Operating cash flows from operating leases | $ | 207 |  |  | $ | 194 |  |  | $ | 185 |
Right-of-use assets obtained in exchange for lease obligations: |  |  |  |  |
Operating leases | $ | 175 |  |  | $ | 158 |  |  | $ | 113 |
Schedule of weighted average remaining lease term and weighted average discount rate related to leases | The table below shows a weighted-average analysis for lease terms and discount rates for operating leases:
December 31, | 2024 |  | 2023
Weighted Average Remaining Lease Term | 13 years |  | 13 years
Weighted Average Discount Rate | 4.7 | % |  | 4.3 | %
Maturities of lease liabilities | The maturities of lease liabilities are as follows:
| Operating Leases |  |  |
(Dollars in millions) |  |  |  |
2025 | $ | 182 |  |  |  |
2026 | 155 |  |  |  |
2027 | 132 |  |  |  |
2028 | 111 |  |  |  |
2029 | 83 |  |  |  |
Thereafter | 711 |  |  |  |
Total lease payments 1 | $ | 1,374 |  |  |  |
Less: Imputed interest | 411 |  |  |  |
Present value of lease liabilities | $ | 963 |  |  |  |
1 Lease payments exclude $27 million of legally binding lease payments for leases signed but not yet commenced.
Lease income | The following table shows the components of lease income which are included in Service revenues in the Consolidated Statement of Operations:
Year Ended December 31, | 2024 |  | 2023 |  | 2022
(Dollars in millions) |  |  |  |  |
Operating lease income | $ | 103 |  |  | $ | 101 |  |  | $ | 93 |
Maturities of expected lease revenues | The maturities of expected lease payments to be received are as follows:
| Operating Leases
(Dollars in millions) |
2025 | $ | 87 |
2026 | 78 |
2027 | 60 |
2028 | 46 |
2029 | 26 |
Thereafter | 14 |
Total future lease maturities | $ | 311 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Tabular disclosure of maturity of undiscounted cash flows to be received by lessor on annual basis for operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-12 + Details
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- Definition Tabular disclosure of components of income from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-6A + Details
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