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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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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 year | 241 |  |  | 224 |
Granted | 29 |  |  | 40 |
Notional dividends reinvested | 10 |  |  | 10 |
Paid out | (39) |  |  | (33) |
End of year | 241 |  |  | 241 |
PSU Plans Activity | The following table summarizes information related to PSUs.
| 2024 |  |  | 2023 |
Number of units (thousands) |  |  |
Beginning of year | 1,942 |  |  | 1,790 |
Granted | 788 |  |  | 722 |
Notional dividends reinvested | 78 |  |  | 66 |
Paid out | (609) |  |  | (606) |
Cancelled/forfeited | (28) |  |  | (30) |
End of year | 2,171 |  |  | 1,942 |
Additional information ($ millions) |  |  |
Compensation expense recognized | 53 |  |  | 45 |
Compensation expense unrecognized (1) | 34 |  |  | 28 |
Cash payout | 44 |  |  | 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 31 st 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 year | 1,079 |  |  | 977 |
Granted | 464 |  |  | 416 |
Notional dividends reinvested | 38 |  |  | 35 |
Paid out | (357) |  |  | (323) |
Cancelled/forfeited | (23) |  |  | (26) |
End of year | 1,201 |  |  | 1,079 |
Additional information ($ millions) |  |  |
Compensation expense recognized | 29 |  |  | 21 |
Compensation expense unrecognized (1) | 21 |  |  | 17 |
Cash payout | 19 |  |  | 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 31 st 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

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock awards granted to nonemployee directors that were outstanding at the beginning and end of the year, and the number of awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Subparagraph (c) -Paragraph 2 -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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