CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Assets
Cash and cash equivalents	$ 330	$ 620
Accounts receivable, net of allowance of $2 at March 31, 2026 and December 31, 2025	638	540
Materials and supplies, net of allowance of $144 and $140 at March 31, 2026 and December 31, 2025, respectively	383	378
Assets held for sale	1	24
Restricted cash and cash equivalents	285	377
Other current assets	129	142
Total current assets	1,766	2,081
Property and equipment	17,465	17,451
Less accumulated depreciation	(5,006)	(4,874)
Property and equipment, net	12,459	12,577
Deferred tax assets, net	47	61
Other assets	879	923
Total assets	15,151	15,642
Liabilities and equity
Accounts payable	229	242
Accrued income taxes	28	22
Debt due within one year	329	445
Other current liabilities	562	627
Total current liabilities	1,148	1,336
Long-term debt	4,945	5,212
Deferred tax liabilities, net	317	404
Other long-term liabilities	549	582
Total long-term liabilities	5,811	6,198
Commitments and contingencies
Shares, $0.10 par value, 1,204 authorized, 141 conditionally authorized, 1,204 issued at March 31, 2026 and December 31, 2025, and 1,107 and 1,102 outstanding at March 31, 2026 and December 31, 2025, respectively	111	110
Additional paid-in capital	15,611	15,604
Accumulated deficit	(7,389)	(7,460)
Accumulated other comprehensive loss	(141)	(146)
Total equity	8,192	8,108
Total liabilities and equity	$ 15,151	$ 15,642

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.