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Derivative Instruments and Hedging Activities - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Sep. 30, 2023
Fair Value of Assets
Gross amount recognized	$ 34	$ 56
Gross amount eligible for offsetting	(10)	(19)
Net amount	24	37
Fair Value of Liabilities
Gross amount recognized	3,319	3,280
Gross amount eligible for offsetting	(10)	(19)
Net amount	$ 3,309	$ 3,261

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