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Leases (Tables)
 12 Months Ended
Dec. 31, 2024
Leases [Abstract]  
Schedule of Lease Cost
Lease Cost

The following table presents costs related to lease activities:
Year Ended December 31,
202420232022
(in millions)
Operating lease cost$17 $12 $9 
Finance lease:
Finance lease right-of-use asset amortization8 10 9 
Interest on lease liabilities11 11 12 
Total finance lease cost19 21 21 
Variable lease cost (a)29 37 22 
Short-term lease cost56 44 47 
Total lease cost$121 $114 $99 
____________
(a)Represents coal stockpile management services, common area maintenance services, and rail car payments based on the number of rail cars used.
Schedule of Lease Balance Sheet Information
Balance Sheet Information

The following table presents lease related balance sheet information:
December 31,
20242023
(in millions)
Lease assets:
Operating lease right-of-use assets (reported in other noncurrent assets in the consolidated balance sheets)$106 $50 
Finance lease right-of-use assets, net of accumulated amortization (reported in property, plant, and equipment in the consolidated balance sheets)153 $160 
Total lease right-of-use assets$259 $210 
Current lease liabilities (reported in other current liabilities in the consolidated balance sheets):
Operating lease liabilities$13 $7 
Finance lease liabilities9 9 
Total current lease liabilities22 16 
Noncurrent lease liabilities (reported in other noncurrent liabilities and deferred credits in the consolidated balance sheets):
Operating lease liabilities98 48 
Finance lease liabilities218 227 
Total noncurrent lease liabilities316 275 
Total lease liabilities$338 $291 
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,
202420232022
(in millions)
Non-cash disclosure upon commencement of new lease:
Right-of-use assets obtained in exchange for new operating lease liabilities68 3 19 
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 assets1 7 — 
Modification of finance lease right-of-use assets— (1)4 
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,
20242023
Weighted average remaining lease term:
Operating lease23.8 years20.1 years
Finance lease23.7 years24.0 years
Weighted average discount rate:
Operating lease7.85%6.49 %
Finance lease4.82%4.81 %
Schedule of Maturity of Operating Lease Liabilities
Maturity of Lease Liabilities

The following table presents maturity of lease liabilities:
Operating LeaseFinance LeaseTotal Lease
(in millions)
2025$19 $19 $38 
202613 14 27 
202714 13 27 
202810 13 23 
20298 13 21 
Thereafter222 331 553 
Total lease payments286 403 689 
Less: Imputed interest
(175)(176)(351)
Present value of lease liabilities$111 $227 $338 
Schedule of Maturity of Finance Lease Liabilities
Maturity of Lease Liabilities

The following table presents maturity of lease liabilities:
Operating LeaseFinance LeaseTotal Lease
(in millions)
2025$19 $19 $38 
202613 14 27 
202714 13 27 
202810 13 23 
20298 13 21 
Thereafter222 331 553 
Total lease payments286 403 689 
Less: Imputed interest
(175)(176)(351)
Present value of lease liabilities$111 $227 $338