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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2025
Equity [Abstract]  
Summary of Common Stock Shares of Common Stock issued, in treasury and outstanding, were:
Shares IssuedTreasury SharesShares
Outstanding
Balance at January 1, 20231,996,537,778 (630,646,687)1,365,891,091 
Shares repurchased— (22,564,627)(22,564,627)
Exercise of stock options and issuance of
   other stock awards		— 5,156,241 5,156,241 
Balance at December 31, 20231,996,537,778 (648,055,073)1,348,482,705 
Shares repurchased— (36,152,376)(36,152,376)
Exercise of stock options and issuance of
   other stock awards		— 5,498,809 5,498,809 
Balance at December 31, 20241,996,537,778 (678,708,640)1,317,829,138 
Shares repurchased— (39,604,831)(39,604,831)
Exercise of stock options and issuance of
   other stock awards		— 3,352,107 3,352,107 
Balance at December 31, 20251,996,537,778 (714,961,364)1,281,576,414