Debt - Summary of Short-Term Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Short-term Debt [Line Items]
Current debt obligations	$ 1,141	$ 2,179
Commercial Paper
Short-term Debt [Line Items]
Short-term Debt	$ 0	230
1.000% Notes due December 15, 2022
Short-term Debt [Line Items]
Interest rate	1.00%
Current portion of long-term debt	$ 0	487
1.401% Notes due May 24, 2023
Short-term Debt [Line Items]
Interest rate	1.401%
Current portion of long-term debt	$ 0	292
0.632% Notes due June 4, 2023
Short-term Debt [Line Items]
Interest rate	0.632%
Current portion of long-term debt	$ 0	779
0.000% Notes due August 13, 2023
Short-term Debt [Line Items]
Interest rate	0.00%
Current portion of long-term debt	$ 0	390
3.875% Notes due May 15, 2024
Short-term Debt [Line Items]
Interest rate	3.875%
Current portion of long-term debt	$ 144	0
3.363% Notes due June 6, 2024
Short-term Debt [Line Items]
Interest rate	3.363%
Current portion of long-term debt	$ 997	$ 0

Amount of debt and lease obligation, classified as current.

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