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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Activities      
Net income $ 5,349 $ 5,919 $ 5,966
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation 2,210 2,216 2,191
Deferred and other income taxes 340 566 338
Net gain on non-operating asset dispositions (115) (20) (30)
Other operating activities, net 490 98 347
Changes in current assets and liabilities:      
Accounts receivable, net 90 160 (262)
Materials and supplies 113 (9) 7
Other current assets (34) 87 (24)
Accounts payable and other current liabilities (73) (179) (125)
Income and other taxes 170 (229) 278
Cash provided by operating activities 8,540 8,609 8,686
Investing Activities      
Capital investments (2,927) (3,453) (3,437)
Proceeds from asset sales 149 74 63
Maturities of short-term investments (Note 13) 141 130 90
Purchases of short-term investments (Note 13) (136) (115) (90)
Other investing activities, net 97 (71) (37)
Cash used in investing activities (2,676) (3,435) (3,411)
Financing Activities      
Debt issued 4,004 3,986 6,892
Share repurchase programs (Note 18) (3,705) (5,804) (8,225)
Dividends paid (2,626) (2,598) (2,299)
Debt repaid (2,053) (817) (1,736)
Debt exchange (328) (387)
Net issuance of commercial paper (Note 14) (127) (6) 194
Other financing activities, net (67) (20) (48)
Cash used in financing activities (4,902) (5,646) (5,222)
Net change in cash, cash equivalents and restricted cash 962 (472) 53
Cash, cash equivalents, and restricted cash at beginning of year 856 1,328 1,275
Cash, cash equivalents, and restricted cash at end of year 1,818 856 1,328
Non-cash investing and financing activities:      
Term loan renewals 250 250 250
Capital investments accrued but not yet paid 166 224 205
Locomotives sold for material credits   18  
Finance lease financings 12
Cash paid during the year for:      
Income taxes, net of refunds (1,214) (1,382) (1,205)
Interest, net of amounts capitalized $ (1,050) $ (1,033) $ (728)