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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities    
Net income $ 1,518 $ 790
Reconciliation of net income to net cash provided by operating activities:    
Depreciation 692 672
Deferred income taxes 109 5
Gains and losses on properties (57) (25)
Changes in assets and liabilities affecting operations:    
Accounts receivable (57) (43)
Materials and supplies (36) (44)
Other current assets 54 57
Current liabilities other than debt (106) 596
Other – net (90) (133)
Net cash provided by operating activities 2,027 1,875
Cash flows from investing activities    
Property additions (924) (1,125)
Acquisition of assets of CSR 0 (1,643)
Property sales and other transactions 66 70
Investment purchases (613) (206)
Investment sales and other transactions 36 337
Net cash used in investing activities (1,435) (2,567)
Cash flows from financing activities    
Dividends (609) (610)
Common stock transactions (8) (5)
Purchase and retirement of common stock (456) 0
Proceeds from borrowings 396 600
Debt repayments (253) (202)
Net cash used in financing activities (930) (217)
Net decrease in cash and cash equivalents (338) (909)
Cash and cash equivalents    
At beginning of year 1,641 1,568
At end of period 1,303 659
Supplemental disclosures of cash flow information    
Interest (net of amounts capitalized) 378 373
Income taxes (net of refunds) $ 414 $ 107