Fair Value Measurements (Details) - USD ($) $ in Millions	Jan. 31, 2022	Apr. 30, 2021
Assets:
Cash and cash equivalents, Carrying Amount	$ 812	$ 1,150
Cash and cash equivalents, Fair Value	812	1,150
Liabilities:
Short-term borrowings, Carrying Amount	16	205
Short-term borrowings, Fair Value	16	205
Long-term debt (including current portion), Carrying Amount	2,311	2,354
Fair Value, Inputs, Level 2 [Member]
Assets:
Currency derivatives, Fair Value	30	3
Liabilities:
Currency derivatives, Fair Value	2	31
Long-term debt (including current portion), Fair Value	2,537	2,663
Foreign Exchange Contract [Member]
Assets:
Currency derivatives, Carrying Amount	30	3
Liabilities:
Currency derivatives, Carrying Amount	$ 2	$ 31