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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Activities      
Net income $ 6,379 $ 6,998 $ 6,523
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation 2,318 2,246 2,208
Deferred and other income taxes 117 262 154
Other operating activities, net (132) (152) (56)
Changes in current assets and liabilities:      
Accounts receivable, net (177) (169) (217)
Materials and supplies (2) (120) 17
Other current assets (38) 5 31
Accounts payable and other current liabilities (215) 565 184
Income and other taxes 129 (273) 188
Cash provided by operating activities 8,379 9,362 9,032
Investing Activities      
Capital investments (3,606) (3,620) (2,936)
Other investing activities, net (61) 149 227
Cash used in investing activities (3,667) (3,471) (2,709)
Financing Activities      
Dividends paid (3,173) (3,159) (2,800)
Debt repaid (2,190) (2,291) (1,299)
Debt issued (Note 14) 1,599 6,080 4,201
Share repurchase programs (Note 18) (705) (6,282) (7,291)
Other financing activities, net (156) (235) 31
Cash used in financing activities (4,625) (5,887) (7,158)
Net change in cash, cash equivalents, and restricted cash 87 4 (835)
Cash, cash equivalents, and restricted cash at beginning of year 987 983 1,818
Cash, cash equivalents, and restricted cash at end of year 1,074 987 983
Non-cash investing and financing activities:      
Capital investments accrued but not yet paid 137 152 263
Term loan renewals 0 0 100
Common shares repurchased but not yet paid 5 0 0
Cash paid during the year for:      
Income taxes, net of refunds (1,486) (2,060) (1,658)
Interest, net of amounts capitalized $ (1,268) $ (1,156) $ (1,087)