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Earnings Per Common Share ("EPS") (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Abstract]      
Net Income $ 1,597 $ 1,325 $ 1,575
Weighted-average common shares outstanding (for basic calculation) (in shares) 281.0 286.0 297.0
Effect of dilutive share-based employee compensation (in shares) 4.0 4.0 5.0
Weighted-average common and dilutive potential common shares outstanding (for diluted calculation) (in shares) 285.0 290.0 302.0
Basic EPS (in dollars per share) $ 5.68 $ 4.63 $ 5.30
Diluted EPS (in dollars per share) $ 5.59 $ 4.57 $ 5.21
Unexercised employee stock options and stock appreciation rights (in millions) excluded from the diluted EPS computation (in shares) [1] 1.7 1.9 1.1
[1] These unexercised employee SARs, RSUs, performance share units ("PSUs") and stock options were not included in the computation of diluted EPS because to do so would have been antidilutive for the periods presented.