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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities    
Net income $ 822 $ 1,522
Reconciliation of net income to net cash provided by operating activities:    
Depreciation 642 606
Deferred income taxes (35) 111
Gains and losses on properties (25) (37)
Changes in assets and liabilities affecting operations:    
Accounts receivable 57 (230)
Materials and supplies (19) (71)
Other current assets 36 30
Current liabilities other than debt 460 75
Other – net (92) 5
Net cash provided by operating activities 1,846 2,011
Cash flows from investing activities    
Property additions (948) (837)
Property sales and other transactions 61 100
Investment purchases (6) (7)
Investment sales and other transactions 152 30
Net cash used in investing activities (741) (714)
Cash flows from financing activities    
Dividends (615) (591)
Common stock transactions (9) (14)
Purchase and retirement of common stock (303) (1,454)
Proceeds from borrowings 724 1,732
Debt repayments (802) (550)
Net cash used in financing activities (1,005) (877)
Net increase in cash and cash equivalents 100 420
Cash and cash equivalents    
At beginning of year 456 839
At end of period 556 1,259
Supplemental disclosures of cash flow information    
Interest (net of amounts capitalized) 318 294
Income taxes (net of refunds) $ 315 $ 321