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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities      
Net income $ 3,005 $ 2,013 $ 2,722
Reconciliation of net income to net cash provided by operating activities:      
Depreciation 1,181 1,154 1,139
Deferred income taxes 184 142 330
Gains and losses on properties (86) (39) (42)
Loss on asset disposal 0 385 0
Impairment of investment 0 99 0
Changes in assets and liabilities affecting operations:      
Accounts receivable (133) 71 87
Materials and supplies 3 23 (37)
Other current assets (6) 3 (4)
Current liabilities other than debt 283 34 (185)
Other – net (176) (248) (118)
Net cash provided by operating activities 4,255 3,637 3,892
Cash flows from investing activities      
Property additions (1,470) (1,494) (2,019)
Property sales and other transactions 159 333 377
Investment purchases (10) (13) (18)
Investment sales and other transactions 99 (1) (104)
Net cash used in investing activities (1,222) (1,175) (1,764)
Cash flows from financing activities      
Dividends (1,028) (960) (949)
Common Stock transactions 17 69 27
Purchase and retirement of Common Stock (3,390) (1,439) (2,099)
Proceeds from borrowings – net of issuance costs 1,676 784 2,192
Debt repayments (584) (381) (1,188)
Other 0 0 23
Net cash used in financing activities (3,309) (1,927) (1,994)
Net increase (decrease) in cash and cash equivalents (276) 535 134
Cash and cash equivalents      
At beginning of year 1,115 580 446
At end of year 839 1,115 580
Supplemental disclosures of cash flow information      
Interest (net of amounts capitalized) 579 577 555
Income taxes (net of refunds) $ 654 $ 311 $ 543