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Capital Stock: (Tables)
12 Months Ended
Dec. 31, 2025
Class of Stock Disclosures [Abstract]  
Schedule of Common Stock
Shares of authorized common stock are 6.0 billion; issued, repurchased and outstanding shares were as follows:
Shares IssuedShares
Repurchased
Shares
Outstanding
Balances, January 1, 20232,109,316,331 (559,098,620)1,550,217,711 
Issuance of stock awards2,206,820 2,206,820 
Balances, December 31, 20232,109,316,331 (556,891,800)1,552,424,531 
Issuance of stock awards2,421,069 2,421,069 
Balances, December 31, 20242,109,316,331 (554,470,731)1,554,845,600 
Issuance of stock awards1,811,089 1,811,089 
Balances, December 31, 20252,109,316,331 (552,659,642)1,556,656,689