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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 from operating activities      
Net income $ 2,622 $ 1,827 $ 3,270
Reconciliation of net income to net cash provided by operating activities:      
Depreciation 1,353 1,298 1,221
Deferred income taxes 176 (49) 83
Gains and losses on properties (490) (49) (82)
Changes in assets and liabilities affecting operations:      
Accounts receivable 85 (2) (171)
Materials and supplies (13) (11) (35)
Other current assets 5 (54) (18)
Current liabilities other than debt 548 435 23
Other – net (234) (216) (69)
Net cash provided by operating activities 4,052 3,179 4,222
Cash flows from investing activities      
Property additions (2,381) (2,327) (1,948)
Acquisition of assets of CSR (1,643) (22) 0
Property sales and other transactions 558 86 263
Investment purchases (319) (124) (12)
Investment sales and other transactions 1,005 205 94
Net cash used in investing activities (2,780) (2,182) (1,603)
Cash flows from financing activities      
Dividends (1,221) (1,225) (1,167)
Common Stock transactions 26 3 (4)
Purchase and retirement of Common Stock 0 (622) (3,110)
Proceeds from borrowings 1,051 3,293 1,832
Debt repayments (1,055) (1,334) (553)
Net cash provided by (used in) financing activities (1,199) 115 (3,002)
Net increase (decrease) in cash and cash equivalents 73 1,112 (383)
Cash and cash equivalents      
At beginning of year 1,568 456 839
At end of year 1,641 1,568 456
Supplemental disclosures of cash flow information      
Interest (net of amounts capitalized) 764 653 619
Income taxes (net of refunds) $ 305 $ 681 $ 750