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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities    
Net income $ 1,300 $ 2,480
Reconciliation of net income to net cash provided by operating activities:    
Depreciation 968 912
Deferred income taxes (53) 23
Gains and losses on properties (34) (54)
Changes in assets and liabilities affecting operations:    
Accounts receivable (65) (174)
Materials and supplies (50) (58)
Other current assets 37 57
Current liabilities other than debt 538 273
Other – net (135) (35)
Net cash provided by operating activities 2,506 3,424
Cash flows from investing activities    
Property additions (1,496) (1,282)
Property sales and other transactions 62 193
Investment purchases (120) (8)
Investment sales and other transactions 160 37
Net cash used in investing activities (1,394) (1,060)
Cash flows from financing activities    
Dividends (920) (881)
Common stock transactions (9) (5)
Purchase and retirement of common stock (503) (2,284)
Proceeds from borrowings 2,303 1,732
Debt repayments (933) (551)
Net cash used in financing activities (62) (1,989)
Net increase in cash and cash equivalents 1,050 375
Cash and cash equivalents    
At beginning of year 456 839
At end of period 1,506 1,214
Supplemental disclosures of cash flow information    
Interest (net of amounts capitalized) 451 425
Income taxes (net of refunds) $ 521 $ 578