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Earnings Per Common Share
12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Earnings Per Common Share 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