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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Earnings Per Share [Abstract]      
Net income available to common stockholders $ 827 $ 835 $ 717
Share data (in thousands):      
Basic average common shares outstanding (shares) 477,765 478,956 480,319
Dilutive effect of stock-based awards (shares) 2,644 3,111 3,929
Diluted average common shares outstanding (shares) 480,409 482,067 484,248
Basic earnings per share (dollars per share) $ 1.73 $ 1.74 $ 1.49
Diluted earnings per share (dollars per share) $ 1.72 $ 1.73 $ 1.48
Antidilutive common stock-based awards excluded from calculation of diluted earnings per share (shares) 301 447 805