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Earnings Per Common Share ("EPS") (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net Income $ 528 $ 283 $ 1,245 $ 572
Weighted-average common shares outstanding (for basic calculation) 296.0 303.0 298.0 302.0
Effect of dilutive share-based employee compensation 6.0 4.0 6.0 5.0
Weighted-average common and dilutive potential common shares outstanding (for diluted calculation) 302.0 307.0 304.0 307.0
Basic EPS $ 1.78 $ 0.94 $ 4.17 $ 1.89
Diluted EPS $ 1.75 $ 0.92 $ 4.10 $ 1.86
Unexercised employee stock options and stock appreciation rights (in millions) excluded from the diluted EPS computation [1] 0.1 4.7 1.5 4.6
[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.