Stock Plans: (Share and Fair Value for Restricted Share Unit Awards) (Details) - Restricted Stock Units (RSUs) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of RSU Awards that Vested (in shares)	1,849,088	1,483,356	1,603,571
Grant Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value/Total Fair Value of Vested Shares of RSU Awards	$ 158	$ 129	$ 126
Fair Value
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value/Total Fair Value of Vested Shares of RSU Awards	$ 171	$ 148	$ 174

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details