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Leases (Tables) | 12 Months Ended
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Dec. 31, 2023
Leases [Abstract] |
Schedule of Lease Cost | Lease Cost The following table presents costs related to lease activities:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Operating lease cost | $ | 12 |  |  | $ | 9 |  |  | $ | 11 |
Finance lease: |  |  |  |  |
Finance lease right-of-use asset amortization | 10 |  |  | 9 |  |  | 9 |
Interest on lease liabilities | 11 |  |  | 12 |  |  | 10 |
Total finance lease cost | 21 |  |  | 21 |  |  | 19 |
Variable lease cost (a) | 37 |  |  | 22 |  |  | 29 |
Short-term lease cost | 44 |  |  | 47 |  |  | 35 |
Sublease income (b) | — |  |  | — |  |  | (7) |
Net lease cost | $ | 114 |  |  | $ | 99 |  |  | $ | 87 |
____________ (a)Represents coal stockpile management services, common area maintenance services, and rail car payments based on the number of rail cars used. (b)Represents sublease income related to real estate leases.
Schedule of Lease Balance Sheet Information | Balance Sheet Information The following table presents lease related balance sheet information:
| December 31,
| 2023 |  | 2022
Lease assets: |  |  |
Operating lease right-of-use assets | $ | 50 |  |  | $ | 51 |
Finance lease right-of-use assets (net of accumulated depreciation) | 160 |  |  | $ | 173 |
Total lease right-of-use assets | 210 |  |  | 224 |
Current lease liabilities: |  |  |
Operating lease liabilities | 7 |  |  | 8 |
Finance lease liabilities | 9 |  |  | 9 |
Total current lease liabilities | 16 |  |  | 17 |
Noncurrent lease liabilities: |  |  |
Operating lease liabilities | 48 |  |  | 45 |
Finance lease liabilities | 227 |  |  | 237 |
Total noncurrent lease liabilities | 275 |  |  | 282 |
Total lease liabilities | $ | 291 |  |  | $ | 299 |
Schedule of Lease Cash Flow Information | Supplemental Cash Flow Information The following table presents lease related cash flows and other information:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Non-cash disclosure upon commencement of new lease: |  |  |  |  |
Right-of-use assets obtained in exchange for new operating lease liabilities | 3 |  |  | 19 |  |  | 7 |
Right-of-use assets obtained in exchange for new finance lease liabilities | — |  |  | 6 |  |  | — |
Non-cash disclosure upon modification of existing lease: |  |  |  |  |
Modification of operating lease right-of-use assets | 7 |  |  | — |  |  | (4) |
Modification of finance lease right-of-use assets | (1) |  |  | 4 |  |  | (1) |
Schedule of Weighted Average Remaining Lease Terms and Discount Rates | Weighted Average Remaining Lease Term The following table presents weighted average remaining lease term information:
| December 31,
| 2023 |  | 2022
Weighted average remaining lease term: |  |  |
Operating lease | 20.1 years |  | 15.8 years
Finance lease | 24.0 years |  | 24.2 years
Weighted average discount rate: |  |  |
Operating lease | 6.49% |  | 6.26 | %
Finance lease | 4.81% |  | 4.81 | %
Schedule of Maturity of Operating Lease Liabilities | Maturity of Lease Liabilities The following table presents maturity of lease liabilities:
| Operating Lease |  | Finance Lease |  | Total Lease
2024 | $ | 10 |  |  | $ | 20 |  |  | $ | 30 |
2025 | 7 |  |  | 19 |  |  | 26 |
2026 | 4 |  |  | 14 |  |  | 18 |
2027 | 4 |  |  | 13 |  |  | 17 |
2028 | 4 |  |  | 13 |  |  | 17 |
Thereafter | 77 |  |  | 345 |  |  | 422 |
Total lease payments | 106 |  |  | 424 |  |  | 530 |
Less: Interest | (51) |  |  | (188) |  |  | (239) |
Present value of lease liabilities | $ | 55 |  |  | $ | 236 |  |  | $ | 291 |
Schedule of Maturity of Finance Lease Liabilities | Maturity of Lease Liabilities The following table presents maturity of lease liabilities:
| Operating Lease |  | Finance Lease |  | Total Lease
2024 | $ | 10 |  |  | $ | 20 |  |  | $ | 30 |
2025 | 7 |  |  | 19 |  |  | 26 |
2026 | 4 |  |  | 14 |  |  | 18 |
2027 | 4 |  |  | 13 |  |  | 17 |
2028 | 4 |  |  | 13 |  |  | 17 |
Thereafter | 77 |  |  | 345 |  |  | 422 |
Total lease payments | 106 |  |  | 424 |  |  | 530 |
Less: Interest | (51) |  |  | (188) |  |  | (239) |
Present value of lease liabilities | $ | 55 |  |  | $ | 236 |  |  | $ | 291 |

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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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