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Earnings Per Common Share ("EPS") (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net Income $ 326 $ 83
Weighted-average common shares outstanding (for basic calculation) 301.0 302.0
Effect of dilutive share-based employee compensation 4.0 5.0
Weighted-average common and dilutive potential common shares outstanding (for diluted calculation) 305.0 307.0
Basic Earnings Per Common Share $ 1.09 $ 0.28
Diluted EPS $ 1.07 $ 0.27
Unexercised employee stock options and stock appreciation rights (in millions) excluded from the diluted EPS computation [1] 2.3 4.2
[1] These unexercised employee stock options and stock appreciation rights were not included in the computation of diluted EPS because to do so would have been antidilutive for the periods presented.