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Changes in Equity (Tables)
 3 Months Ended
Mar. 31, 2025
Stockholders' Equity Note [Abstract]  
Schedule of Changes in Equity
Millions of Dollars
Common Stock
Par
Value
Capital in
Excess of
Par
Treasury
Stock
Accum. Other
Comprehensive
Income (Loss)
Retained
Earnings
Total
For the three months ended March 31, 2025
Balances at December 31, 2024$23 77,529 (71,152)(6,473)64,869 64,796 
Net income (loss)2,849 2,849 
Other comprehensive income (loss)79 79 
Dividends declared
Ordinary ($0.78 per common share)
(998)(998)
Repurchase of company common stock(1,500)(1,500)
Excise tax on share repurchases(13)(13)
Distributed under benefit plans25 25 
Other (1)1 — 
Balances at March 31, 2025$23 77,554 (72,666)(6,394)66,721 65,238 
Millions of Dollars
Common Stock
Par
Value
Capital in
Excess of
Par
Treasury
Stock
Accum. Other
Comprehensive
Income (Loss)
Retained
Earnings
Total
For the three months ended March 31, 2024
Balances at December 31, 2023$21 61,303 (65,640)(5,673)59,268 49,279 
Net income (loss)2,551 2,551 
Other comprehensive income (loss)(244)(244)
Dividends declared
Ordinary ($0.58 per common share)
(687)(687)
Variable return of cash ($0.20 per common share)
(237)(237)
Repurchase of company common stock(1,325)(1,325)
Excise tax on share repurchases(9)(9)
Distributed under benefit plans
(3)(3)
Balances at March 31, 2024
$21 61,300 (66,974)(5,917)60,895 49,325