| USD ($) $ in Millions | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023 | Dec 31, 2022 | Dec 31, 2021 | Dec 31, 2020 | Dec 31, 2019 | Dec 31, 2018 | Dec 31, 2017 | Dec 31, 2016 | Dec 31, 2015 | Dec 31, 2014 | Dec 31, 2013 | Dec 31, 2012 | Dec 31, 2011 | Dec 31, 2010 | Dec 31, 2009 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Current assets: | |||||||||||||||||
Cash and cash equivalents | $ 1,266 | $ 1,016 | $ 1,055 | ||||||||||||||
Short-term investments (Note 13) | 250 | 20 | 16 | ||||||||||||||
Accounts receivable, net (Note 10) | 1,860 | 1,894 | 2,073 | ||||||||||||||
Materials and supplies | 787 | 769 | 743 | ||||||||||||||
Current deferred income taxes (Note 8) | - | - | - | ||||||||||||||
Other current assets | 392 | 322 | 261 | ||||||||||||||
Total current assets | 4,555 | 4,021 | 4,148 | ||||||||||||||
Investments | 2,885 | 2,664 | 2,605 | ||||||||||||||
Properties, net (Note 11) | 59,645 | 58,343 | 57,398 | ||||||||||||||
Operating lease assets (Note 16) | 1,036 | 1,297 | 1,643 | ||||||||||||||
Other assets | 1,577 | 1,390 | 1,338 | ||||||||||||||
Total assets | 69,698 | 67,715 | 67,132 | ||||||||||||||
Liabilities and common shareholders' equity | |||||||||||||||||
Current liabilities: | |||||||||||||||||
Accounts payable and other current liabilities (Note 12) | 3,494 | 3,829 | 3,683 | ||||||||||||||
Debt due within one year (Note 14) | 1,520 | 1,425 | 1,423 | ||||||||||||||
Total current liabilities | 5,014 | 5,254 | 5,106 | ||||||||||||||
Debt due after one year (Note 14) | 30,294 | 29,767 | 31,156 | ||||||||||||||
Operating lease liabilities (Note 16) | 738 | 925 | 1,245 | ||||||||||||||
Deferred income taxes (Note 7) | 13,421 | 13,151 | 13,123 | ||||||||||||||
Other long-term liabilities | 1,764 | 1,728 | 1,714 | ||||||||||||||
Total liabilities | 51,231 | 50,825 | 52,344 | ||||||||||||||
Common shareholders' equity: | |||||||||||||||||
Common shares, $2.50 par value, 1,400,000,000 authorized; 1,113,161,191 and 1,113,018,733 issued; 593,245,884 and 604,241,260 outstanding, respectively | 2,783 | 2,783 | 2,782 | ||||||||||||||
Paid-in-surplus | 5,589 | 5,334 | 5,193 | ||||||||||||||
Retained earnings | 69,529 | 65,628 | 62,093 | ||||||||||||||
Treasury stock | 58,843 | 56,132 | 54,666 | ||||||||||||||
Accumulated other comprehensive income/(loss) (Note 9) | (591) | (723) | (614) | ||||||||||||||
Total common shareholders' equity | 18,467 | 16,890 | 14,788 | ||||||||||||||
Total liabilities and common shareholders' equity | $ 69,698 | $ 67,715 | $ 67,132 |