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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows provided from (used by) operating activities:    
Net loss $ (263) $ (204)
Adjustments to reconcile net income to net cash provided from (used by) operating activities:    
Depreciation and amortization 1,372 1,196
Pension / OPEB special termination benefit enhancements   11
Stock-based compensation expense 48 54
Amortization of premium (16) (15)
Bad debt expense 33 30
Other adjustments 15 10
Deferred income taxes (44) (18)
Change in accounts receivable (96) (3)
Change in long-term pension and other postretirement liabilities (134) (156)
Change in accounts payable and other liabilities 604 392
Change in prepaid expenses, income taxes, and other assets (19) 30
Net cash provided from operating activities 1,500 1,327
Cash flows provided from (used by) investing activities:    
Capital expenditures (2,421) (1,991)
Sale of short-term investments   1,075
Proceeds on sale of assets 4 12
Other 2 6
Net cash used by investing activities (2,415) (898)
Cash flows provided from (used by) financing activities:    
Long-term debt principal payments (5) (410)
Net proceeds from long-term debt borrowings 480 750
Payments of vendor financing (16) (415)
Financing costs paid (17) (29)
Proceeds from notes payable 50  
Finance lease obligation payments (35) (23)
Taxes paid on behalf of employees for shares withheld (12) (49)
Other (14) (12)
Net cash provided from (used by) financing activities 431 (188)
Increase (Decrease) in cash, cash equivalents, and restricted cash (484) 241
Cash, cash equivalents, and restricted cash at January 1, 911 1,239
Cash, cash equivalents, and restricted cash at September 30, 427 1,480
Supplemental cash flow information: Cash paid during the period for:    
Interest 570 565
Income tax payments (refund), net $ 2 $ (8)