v3.25.0.1
Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
DSU Plan Activity
The following table summarizes information related to DSUs.
2024 2023 
Number of units (thousands)
Beginning of year241 224 
Granted29 40 
Notional dividends reinvested10 10 
Paid out(39)(33)
End of year241 241 
PSU Plans Activity
The following table summarizes information related to PSUs.
2024 2023 
Number of units (thousands)
Beginning of year1,942 1,790 
Granted788 722 
Notional dividends reinvested78 66 
Paid out(609)(606)
Cancelled/forfeited(28)(30)
End of year2,171 1,942 
Additional information ($ millions)
Compensation expense recognized 53 45 
Compensation expense unrecognized (1)
34 28 
Cash payout44 46 
Accrued liability as at December 31 (2)
105 90 
Aggregate intrinsic value as at December 31 (3)
139 118 
(1)    Relates to unvested PSUs and is expected to be recognized over a weighted average period of two years
(2)    Recognized at the respective December 31st VWAP and included in accounts payable and other current liabilities and in other liabilities (Notes 13 and 16)
(3)    Relates to outstanding PSUs and reflects a weighted average contractual life of one year
RSU Plans Activity
The following table summarizes information related to RSUs.
2024 2023 
Number of units (thousands)
Beginning of year1,079 977 
Granted464 416 
Notional dividends reinvested38 35 
Paid out(357)(323)
Cancelled/forfeited(23)(26)
End of year1,201 1,079 
Additional information ($ millions)
Compensation expense recognized 29 21 
Compensation expense unrecognized (1)
21 17 
Cash payout19 17 
Accrued liability as at December 31 (2)
54 42 
Aggregate intrinsic value as at December 31 (3)
75 59 
(1)    Relates to unvested RSUs and is expected to be recognized over a weighted average period of two years
(2)    Recognized at the respective December 31st VWAP and included in accounts payable and other current liabilities and in long-term other liabilities (Notes 13 and 16)
(3)    Relates to outstanding RSUs and reflects a weighted average contractual life of one year