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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Operating Activities    
Net income $ 5,360 $ 4,812
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation 1,677 1,652
Deferred and other income taxes 180 189
Other operating activities, net (93) (67)
Changes in current assets and liabilities:    
Accounts receivable, net (330) (174)
Materials and supplies (173) (26)
Other current assets (9) 19
Accounts payable and other current liabilities 433 (4)
Income and other taxes 25 102
Cash provided by operating activities 7,070 6,503
Investing Activities    
Capital investments (2,690) (1,945)
Proceeds from asset sales 172 120
Maturities of short-term investments (Note 13) 46 64
Purchases of short-term investments (Note 13) (46) (40)
Other investing activities, net (41) 9
Cash used in investing activities (2,559) (1,792)
Financing Activities    
Debt issued (Note 14) 6,080 3,901
Share repurchase programs (Note 16) (5,497) (5,846)
Dividends paid (2,362) (2,045)
Debt repaid (2,185) (1,120)
Net issued/(paid) commercial paper (Note 14) (203) 125
Debt exchange 0 (270)
Other financing activities, net (43) (36)
Cash used in financing activities (4,210) (5,291)
Net Change in Cash, Cash Equivalents, and Restricted Cash 301 (580)
Cash, cash equivalents, and restricted cash at beginning of year 983 1,818
Cash, cash equivalents, and restricted cash at end of period 1,284 1,238
Non-cash investing and financing activities:    
Capital investments accrued but not yet paid 172 151
Common shares repurchased but not yet paid 80 80
Cash (paid for)/received from:    
Income taxes, net of refunds (1,473) (1,241)
Interest, net of amounts capitalized (980) (904)
Cash and cash equivalents 1,267 1,194
Total cash, cash equivalents and restricted cash equivalents per above 1,284 1,238
Other Current Assets [Member]    
Cash (paid for)/received from:    
Restricted cash equivalents 13 32
Other Noncurrent Assets [Member]    
Cash (paid for)/received from:    
Restricted cash equivalents $ 4 $ 12