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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Derivative [Line Items]          
Pre-tax gains (losses) associated with net investment hedges $ 6,000,000 $ (7,000,000) $ (9,000,000) $ (80,000,000)  
Maximum amount of loss 162,000,000   162,000,000    
Cash collateral received 12,000,000 36,000,000 12,000,000 36,000,000 $ 40,000,000
IRPAs          
Derivative [Line Items]          
Notional amount 0 $ 0 0 $ 0 $ 0
Pre-tax net gains associated with interest rate hedges $ 9,000,000   $ 9,000,000    
Forward foreign currency exchange contracts          
Derivative [Line Items]          
Derivative notional amount percent of required need coverage 90.00%   90.00%