CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Assets
Cash and cash equivalents	$ 377	$ 560
Accounts receivable, net of allowance of $2 at June 30, 2025 and December 31, 2024	577	564
Materials and supplies, net of allowance of $167 and $178 at June 30, 2025 and December 31, 2024, respectively	427	439
Assets held for sale	43	343
Restricted cash and cash equivalents	395	381
Other current assets	181	165
Total current assets	2,000	2,452
Property and equipment	20,957	22,417
Less accumulated depreciation	(6,205)	(6,586)
Property and equipment, net	14,752	15,831
Deferred tax assets, net	48	45
Other assets	1,011	1,043
Total assets	17,811	19,371
Liabilities and equity
Accounts payable	253	255
Accrued income taxes	8	31
Debt due within one year	666	686
Other current liabilities	655	691
Total current liabilities	1,582	1,663
Long-term debt	5,885	6,195
Deferred tax liabilities, net	345	499
Other long-term liabilities	645	729
Total long-term liabilities	6,875	7,423
Commitments and contingencies
Shares, $0.10 par value, 1,204,009,681 authorized, 141,262,093 conditionally authorized, 1,204,009,681 issued and 902,249,348 outstanding at June 30, 2025, and 1,057,879,029 authorized, 141,262,093 conditionally authorized, 940,828,901 issued and 875,830,772 outstanding at December 31, 2024	90	87
Additional paid-in capital	14,966	14,880
Accumulated deficit	(5,562)	(4,545)
Accumulated other comprehensive loss	(141)	(138)
Total controlling interest shareholders' equity	9,353	10,284
Noncontrolling interest	1	1
Total equity	9,354	10,285
Total liabilities and equity	$ 17,811	$ 19,371