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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows provided from (used by) operating activities:      
Net (loss) income $ (322) $ 29 $ 441
Adjustments to reconcile net loss to net cash provided from (used by) operating activities:      
Depreciation and amortization 1,625 1,415 1,182
Pension settlement costs   55
Pension/OPEB special termination benefit enhancements 12  
Stock-based compensation expense 68 108 82
Amortization of (premium) discount (20) (25) (28)
Lease Impairment   44
Bad debt expense 39 35 26
Other adjustments 10 12
Deferred income taxes (27) 78 164
Change in accounts receivable 28 (43) (7)
Change in long-term pension and other post-retirement liabilities (142) (325) (656)
Change in accounts payable and other liabilities 301 55 51
Change in prepaid expenses, income taxes, and other assets 49 5 47
Net cash provided from operating activities 1,621 1,344 1,401
Cash flows provided from (used by) investing activities:      
Capital expenditures (2,783) (3,211) (2,738)
Purchase of short-term investments (2,275) (4,350)
Sale of short-term investments 1,075 2,950 2,600
Purchase of long-term investments (62)
Proceeds on sale of assets 20 36 13
Other 7 6 7
Net cash used by investing activities (1,681) (2,556) (4,468)
Cash flows provided from (used by) financing activities:      
Long-term debt principal payments (412) (68) (14)
Proceeds from long-term debt borrowings 750 2,278 1,200
Payments of vendor financing (463) (5)
Premium paid to retire debt (10)
Financing costs paid (31) (62) (17)
Finance lease obligation payments (31) (25) (19)
Proceeds from financing lease transactions 30 70
Taxes paid on behalf of employees for shares withheld (65) (9) (8)
Other (16)   (1)
Net cash provided from (used by) financing activities (268) 2,129 1,211
Increase (Decrease) in cash, cash equivalents, and restricted cash (328) 917 (1,856)
Cash, cash equivalents and restricted cash at the beginning of the period 1,239 322 2,178
Cash, cash equivalents, and restricted cash at the end of the period 911 1,239 322
Supplemental cash flow information: Cash paid during the period for:      
Interest 835 711 512
Income tax payments (refunds), net (10)   8
Non-cash investing activities:      
Decrease in capital expenditures due to changes in accounts payable and accrued expenses (40) (326) 797
Increase (Decrease) in capital expenditures due to changes in vendor financing $ (239) $ 255