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Earnings Per Common Share (Tables)
12 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
Schedule of Earnings per Common Share
Diluted earnings per share ("EPS") was calculated using the treasury stock method for stock options.
20242023
Net EarningsWeightedNet EarningsWeighted
to CommonAverageto CommonAverage
ShareholdersSharesEPSShareholdersSharesEPS
($ millions)(# millions)($)($ millions)(# millions)($)
Basic EPS1,606 495.0 3.24 1,506 486.3 3.10 
Potential dilutive effect of stock options (Note 20)
 0.2  — 0.2 — 
Diluted EPS1,606 495.2 3.24 1,506 486.5 3.10