Organization and Summary of Significant Accounting Policies - VIE (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Variable Interest Entity [Line Items]
Current assets	$ 4,086	$ 4,316
Total assets	9,351	9,424	$ 9,158
Current liabilities	3,678	3,738
Noncurrent liabilities	3,139	3,083
Variable interest entity, primary beneficiary
Variable Interest Entity [Line Items]
Current assets	285	265
Noncurrent assets	98	121
Total assets	383	386
Current liabilities	241	228
Noncurrent liabilities	12	13
Total liabilities	$ 253	$ 241