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Stock Plans: (Activity for Restricted Share Unit Awards) (Details) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Number of Shares      
Beginning balance (in shares) 4,542,654 4,603,321 4,519,470
Granted (in shares) 1,526,970 2,013,350 1,756,750
Vested (in shares) (1,431,108) (1,849,088) (1,483,356)
Forfeited (in shares) (177,756) (224,929) (189,543)
Ending balance (in shares) 4,460,760 4,542,654 4,603,321
Weighted- Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 97.78 $ 96.38 $ 91.26
Granted (in dollars per share) 145.53 89.71 101.96
Vested (in dollars per share) 104.85 85.57 87.30
Forfeited (in dollars per share) 108.39 97.43 96.96
Ending balance (in dollars per share) $ 111.43 $ 97.78 $ 96.38
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Total grant date fair value of RSU awards, granted $ 222 $ 181 $ 179
Total grant date fair value of RSU awards, vested (150) (158) (129)
Total grant date fair value of RSU awards, forfeited (19) (22) (18)
Total fair value of RSU awards that vested $ (216) $ (171) $ (148)