Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows provided from (used by) operating activities:
Net income (loss)	$ (64)	$ 1
Adjustments to reconcile net income to net cash provided from (used by) operating activities:
Depreciation and amortization	445	388
Pension / OPEB special termination benefit enhancements		7
Stock-based compensation expense	15	26
Amortization of premium	(5)	(5)
Bad debt expense	11	9
Other adjustments	5	4
Deferred income taxes	(12)
Change in accounts receivable	(48)	(9)
Change in long-term pension and other postretirement liabilities	(66)	(146)
Change in accounts payable and other liabilities	222	27
Change in prepaid expenses, income taxes, and other assets	16	33
Net cash provided from operating activities	519	335
Cash flows provided from (used by) investing activities:
Capital expenditures	(757)	(666)
Sale of short-term investments		850
Proceeds on sale of assets	1
Other		2
Net cash provided from (used by) investing activities	(756)	186
Cash flows provided from (used by) financing activities:
Long-term debt principal payments		(4)
Net proceeds from long-term debt borrowings	100
Payments of vendor financing	(16)	(363)
Financing costs paid	(17)
Finance lease obligation payments	(10)	(7)
Taxes paid on behalf of employees for shares withheld	(10)	(43)
Other	(2)	(6)
Net cash provided from (used by) financing activities	45	(423)
Increase (Decrease) in cash, cash equivalents, and restricted cash	(192)	98
Cash, cash equivalents, and restricted cash at January 1,	911	1,239
Cash, cash equivalents, and restricted cash at March 31,	719	1,337
Supplemental cash flow information: Cash paid during the period for:
Interest	$ 141	149
Income tax refund, net		$ (13)