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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Operating activities        
Net income $ 1,788 $ 1,671 $ 5,290 $ 4,985
Adjustments to reconcile net income to cash provided by operating activities:        
Depreciation 618 602 1,841 1,792
Deferred and other income taxes     172 77
Other operating activities, net     6 (52)
Changes in current assets and liabilities:        
Accounts receivable, net     (27) 37
Materials and supplies     (13) (32)
Other current assets     1 (92)
Accounts payable and other current liabilities     (324) (82)
Income and other taxes     119 51
Cash provided by operating activities     7,065 6,684
Investing activities        
Capital investments     (2,792) (2,530)
Other investing activities, net     1 104
Cash used in investing activities     (2,791) (2,426)
Financing activities        
Share repurchase programs (Note 16)     (2,679) (831)
Dividends paid     (2,418) (2,403)
Debt issued (Note 14)     1,995 800
Debt repaid     (1,424) (2,220)
Other financing activities, net     54 279
Cash used in financing activities     (4,472) (4,375)
Net change in cash, cash equivalents, and restricted cash     (198) (117)
Cash, cash equivalents, and restricted cash at beginning of year     1,028 1,074
Cash, cash equivalents, and restricted cash at end of period 830 957 830 957
Non-cash investing and financing activities:        
Capital investments accrued but not yet paid     190 153
Cash paid during the period for:        
Income taxes, net of refunds     (841) (1,219)
Interest, net of amounts capitalized     (1,083) (1,074)
Reconciliation of cash, cash equivalents, and restricted cash to the Condensed Consolidated Statement of Financial Position:        
Cash and cash equivalents 808 947 808 947
Restricted cash equivalents in other current assets 17 2 17 2
Restricted cash equivalents in other assets 5 8 5 8
Total cash, cash equivalents, and restricted cash equivalents per above $ 830 $ 957 $ 830 $ 957