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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 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 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 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 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

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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

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-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

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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

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-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-Publisher FASB
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Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares.

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-Name Accounting Standards Codification
-Section 50
-Subparagraph (c)
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