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Stock Based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-Based Payment Arrangement, Noncash Expense [Abstract]      
Weighted-average grant date fair value of incentive/performance unit awards and restricted share/restricted share unit awards granted $ 141.75 $ 154.91 $ 198.28
Total intrinsic value of incentive/performance unit and restricted share/restricted share unit awards vested during the year. $ 214 $ 219 $ 322