Derivatives and Other Financial Instruments - Schedule of Outstanding Quantities of Derivative Instruments (Detail) - Level 1 [Member] kt in Thousands, € in Millions, kr in Millions, R$ in Millions, $ in Millions, $ in Millions	Sep. 30, 2024 EUR (€) kt	Sep. 30, 2024 NOK (kr) kt	Sep. 30, 2024 BRL (R$) kt	Sep. 30, 2024 CAD ($) kt	Sep. 30, 2024 AUD ($) kt	Sep. 30, 2023 EUR (€) kt	Sep. 30, 2023 NOK (kr) kt	Sep. 30, 2023 BRL (R$) kt	Sep. 30, 2023 CAD ($) kt
Foreign Exchange Buy Forwards [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Liabilities	€ 165	kr 66	R$ 246	$ 12	$ 45	€ 68	kr 185	R$ 734	$ 33
Foreign Exchange Sell Forwards [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Liabilities | €	€ 14					€ 18
Commodity Sell Forwards [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Outstanding quantities of derivative instruments	67	67	67	67	67	144	144	144	144
Commodity Buy Forwards [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Outstanding quantities of derivative instruments	84	84	84	84	84	126	126	126	126