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Earnings Per Common Share (Tables)
12 Months Ended
Dec. 31, 2023
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.
20232022
Net EarningsWeightedNet EarningsWeighted
to CommonAverageto CommonAverage
ShareholdersSharesEPSShareholdersSharesEPS
($ millions)(# millions)($)($ millions)(# millions)($)
Basic EPS1,506 486.3 3.10 1,330 478.6 2.78 
Potential dilutive effect of stock options (Note 20)
 0.2  — 0.4 — 
Diluted EPS1,506 486.5 3.10 1,330 479.0 2.78