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Leases (Tables) | 12 Months Ended
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Dec. 31, 2024
Leases [Abstract] |
Components of Lease Expense | The components of lease expense were as follows for the year ended December 31 (dollars in millions):
|  | 2024 |  |  | 2023 |  |  | 2022 |
Operating lease cost: |  |  |  |  |  |  |  |  |
Fixed lease cost (Other operating expenses) |  | $ | 5 |  |  | $ | 5 |  |  | $ | 5 |
Variable lease cost (Other operating expenses and Resource costs) |  |  | 31 |  |  |  | 25 |  |  |  | 2 |
Total operating lease cost |  | $ | 36 |  |  | $ | 30 |  |  | $ | 7 |
Finance lease cost: |  |  |  |  |  |  |  |  |
Amortization of ROU asset (Depreciation and amortization) |  | $ | 4 |  |  | $ | 4 |  |  | $ | 4 |
Interest on lease liabilities (Interest expense) |  |  | 2 |  |  |  | 2 |  |  |  | 2 |
Total finance lease cost |  | $ | 6 |  |  | $ | 6 |  |  | $ | 6 |
Summary of Supplemental Cash Flow Information related to Leases | Supplemental cash flow information related to leases was as follows for the year ended December 31 (dollars in millions):
|  | 2024 |  |  | 2023 |  |  | 2022 |
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |  |  |
Operating cash outflows: |  |  |  |  |  |  |  |  |
Operating lease payments |  | $ | 5 |  |  | $ | 5 |  |  | $ | 5 |
Interest on finance lease |  |  | 2 |  |  |  | 2 |  |  |  | 2 |
Total operating cash outflows |  | $ | 7 |  |  | $ | 7 |  |  | $ | 7 |
Finance cash outflows: |  |  |  |  |  |  |  |  |
Principal payments on finance lease |  | $ | 3 |  |  | $ | 3 |  |  | $ | 3 |
Summary of Supplemental Balance Sheet Information Related to Leases | Supplemental balance sheet information related to leases was as follows for December 31 (dollars in millions):
|  | December 31, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Operating Leases |  |  |  |  |  |
Operating lease ROU assets (Other property and investments-net and other non-current assets) |  | $ | 66 |  |  | $ | 68 |
Other current liabilities |  | $ | 4 |  |  | $ | 4 |
Other non-current liabilities and deferred credits |  |  | 62 |  |  |  | 64 |
Total operating lease liabilities |  | $ | 66 |  |  | $ | 68 |
Finance Leases |  |  |  |  |  |
Finance lease ROU assets (Other property and investments-net and other non-current assets) |  | $ | 33 |  |  | $ | 36 |
Other current liabilities |  | $ | 4 |  |  | $ | 3 |
Other non-current liabilities and deferred credits |  |  | 35 |  |  |  | 39 |
Total finance lease liabilities |  | $ | 39 |  |  | $ | 42 |
Weighted Average Remaining Lease Term |  |  |  |  |  |
Operating leases |  | 21 years |  |  | 22 years |
Finance leases |  | 4 years |  |  | 5 years |
Weighted Average Discount Rate |  |  |  |  |  |
Operating leases |  |  | 4.30 | % |  |  | 4.29 | %
Finance leases |  |  | 3.46 | % |  |  | 3.77 | %
Summary of Maturities of Lease Liabilities | Maturities of lease liabilities (including principal and interest) were as follows as of December 31, 2024 (dollars in millions):
|  | Operating Leases |  |  | Finance Leases |
2025 |  | $ | 5 |  |  | $ | 5 |
2026 |  |  | 5 |  |  |  | 5 |
2027 |  |  | 5 |  |  |  | 5 |
2028 |  |  | 5 |  |  |  | 6 |
2029 |  |  | 5 |  |  |  | 6 |
Thereafter |  |  | 79 |  |  |  | 22 |
Total lease payments |  | $ | 104 |  |  | $ | 49 |
Less: imputed interest |  |  | (38 | ) |  |  | (10 | )
Total |  | $ | 66 |  |  | $ | 39 |
Summary of Maturities of Lease Liabilities | Maturities of lease liabilities (including principal and interest) were as follows as of December 31, 2024 (dollars in millions):
|  | Operating Leases |  |  | Finance Leases |
2025 |  | $ | 5 |  |  | $ | 5 |
2026 |  |  | 5 |  |  |  | 5 |
2027 |  |  | 5 |  |  |  | 5 |
2028 |  |  | 5 |  |  |  | 6 |
2029 |  |  | 5 |  |  |  | 6 |
Thereafter |  |  | 79 |  |  |  | 22 |
Total lease payments |  | $ | 104 |  |  | $ | 49 |
Less: imputed interest |  |  | (38 | ) |  |  | (10 | )
Total |  | $ | 66 |  |  | $ | 39 |

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- Definition Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
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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 undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
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