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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Operating Activities    
Net income $ 3,199 $ 3,465
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation 1,149 1,114
Deferred and other income taxes 36 93
Other operating activities, net (126) (52)
Changes in current assets and liabilities:    
Accounts receivable, net 70 (330)
Materials and supplies (1) (169)
Other current assets (86) (39)
Accounts payable and other current liabilities (340) 203
Income and other taxes (43) (118)
Cash provided by operating activities 3,858 4,167
Investing Activities    
Capital investments (1,607) (1,645)
Maturities of short-term investments (Note 12) 46 0
Proceeds from asset sales 45 120
Other investing activities, net (158) (15)
Cash used in investing activities (1,674) (1,540)
Financing Activities    
Debt repaid (1,664) (1,664)
Debt issued (Note 13) 1,599 4,090
Dividends paid (1,588) (1,556)
Share repurchase programs (Note 15) (705) (3,473)
Net issued/(paid) commercial paper (Note 13) 19 (151)
Other financing activities, net 11 (42)
Cash used in financing activities (2,328) (2,796)
Net change in cash, cash equivalents, and restricted cash (144) (169)
Cash, cash equivalents, and restricted cash at beginning of year 987 983
Cash, cash equivalents, and restricted cash at end of period 843 814
Non-cash investing and financing activities:    
Capital investments accrued but not yet paid 207 241
Common shares repurchased but not yet paid 6 2
Cash (paid for)/received from:    
Income taxes, net of refunds (826) (1,033)
Interest, net of amounts capitalized (628) (565)
Cash and cash equivalents 830 788
Total cash, cash equivalents and restricted cash equivalents per above 843 814
Other Current Assets [Member]    
Cash (paid for)/received from:    
Restricted cash equivalents 4 22
Other Noncurrent Assets [Member]    
Cash (paid for)/received from:    
Restricted cash equivalents $ 9 $ 4