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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Operating Activities        
Net income $ 1,528 $ 1,895 $ 4,727 $ 5,360
Adjustments to reconcile net income to cash provided by operating activities:        
Depreciation 580 563 1,729 1,677
Deferred and other income taxes     59 180
Other operating activities, net     (121) (93)
Changes in current assets and liabilities:        
Accounts receivable, net     (38) (330)
Materials and supplies     (29) (173)
Other current assets     (73) (9)
Accounts payable and other current liabilities     (381) 433
Income and other taxes     111 25
Cash provided by operating activities     5,984 7,070
Investing Activities        
Capital investments     (2,582) (2,690)
Other investing activities, net     (68) 131
Cash used in investing activities     (2,650) (2,559)
Financing Activities        
Dividends paid     (2,380) (2,362)
Debt repaid     (2,179) (2,185)
Debt issued (Note 13)     1,599 6,080
Share repurchase programs (Note 15)     (705) (5,497)
Other financing activities, net     125 (246)
Cash used in financing activities     (3,540) (4,210)
Net change in cash, cash equivalents, and restricted cash     (206) 301
Cash, cash equivalents, and restricted cash at beginning of year     987 983
Cash, cash equivalents, and restricted cash at end of period 781 1,284 781 1,284
Non-cash investing and financing activities:        
Capital investments accrued but not yet paid     187 172
Common shares repurchased but not yet paid     6 80
Cash (paid for)/received from:        
Income taxes, net of refunds     (1,155) (1,473)
Interest, net of amounts capitalized     (1,113) (980)
Cash and cash equivalents 750 1,267 750 1,267
Restricted cash equivalents in other current assets 22 13 22 13
Restricted cash equivalents in other assets 9 4 9 4
Cash, cash equivalents, and restricted cash at end of period $ 781 $ 1,284 $ 781 $ 1,284