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Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating Activities    
Net income $ 1,630 $ 1,341
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation 555 549
Deferred and other income taxes 60 54
Other operating activities, net (43) (131)
Changes in current assets and liabilities:    
Accounts receivable, net (236) (105)
Materials and supplies (105) (21)
Other current assets (43) (1)
Accounts payable and other current liabilities 63 (67)
Income and other taxes 355 339
Cash provided by operating activities 2,236 1,958
Investing Activities    
Capital investments (848) (536)
Proceeds from asset sales 32 17
Maturities of short-term investments (Note 12) 0 24
Purchases of short-term investments (Note 12) 0 (24)
Other investing activities, net (20) 14
Cash used in investing activities (836) (505)
Financing Activities    
Debt issued (Note 13) 3,490 0
Share repurchase programs (Note 15) (2,743) (1,347)
Debt repaid (866) (47)
Dividends paid (743) (650)
Net issued/(paid) commercial paper (Note 13) (100) (15)
Other financing activities, net (51) (14)
Cash used in financing activities (1,453) (2,073)
Net Change in Cash, Cash Equivalents, and Restricted Cash (53) (620)
Cash, cash equivalents, and restricted cash at beginning of year 983 1,818
Cash, cash equivalents, and restricted cash at end of period 930 1,198
Non-cash investing and financing activities:    
Capital investments accrued but not yet paid 157 99
Common shares repurchased but not yet paid 10 55
Cash (paid for)/received from:    
Income taxes, net of refunds (7) (1)
Interest, net of amounts capitalized (382) (394)
Cash and cash equivalents 909 1,183
Total cash, cash equivalents and restricted cash equivalents per above 930 1,198
Other Current Assets [Member]    
Cash (paid for)/received from:    
Restricted cash equivalents 17 3
Other Noncurrent Assets [Member]    
Cash (paid for)/received from:    
Restricted cash equivalents 4 12
Accelerated Share Repurchase Agreement [Member]    
Financing Activities    
Share repurchase programs (Note 15) $ (440) $ 0