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Derivative Financial Instruments and Hedging Activities (Gain (Loss) on Derivatives Recognized in Consolidated Statement of Operations) (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Total amounts presented in the accompanying condensed consolidated statements of operations for line items affected by the net gains (losses) shown above: [Abstract]      
Sales $ 5,081 $ 4,526 $ 4,306
Other income (expense), net (59) 15 (11)
Foreign Currency Denominated Debt [Member]      
Foreign currency-denominated debt designated as net investment hedge: [Abstract]      
Net gain (loss) recognized in AOCI 78 (73) 22
Currency derivatives [Member]      
Currency derivatives designated as cash flow hedges: [Abstract]      
Net gain (loss) recognized in AOCI 76 (78) 61
Currency derivatives [Member] | Sales [Member]      
Currency derivatives designated as cash flow hedges: [Abstract]      
Net gain (loss) reclassified from AOCI into earnings 5 21 23
Currency derivatives not designated as hedging instruments: [Abstract]      
Net gain (loss) recognized in earnings 12 (13) 4
Currency derivatives [Member] | Other Income (Expense), Net [Member]      
Currency derivatives designated as cash flow hedges: [Abstract]      
Net gain (loss) reclassified from AOCI into earnings 2 0 0
Currency derivatives not designated as hedging instruments: [Abstract]      
Net gain (loss) recognized in earnings $ 5 $ 17 $ (14)