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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Derivative [Line Items]    
Pre-tax net losses associated with interest rate hedges $ 4,000,000  
Pre-tax (losses) gains associated with net investment hedges 9,000,000 $ (53,000,000)
Total derivative assets – gross 1,687,000,000 139,000,000
Maximum amount of loss 1,687,000,000  
Cash collateral received (468,000,000) 0
IRPA    
Derivative [Line Items]    
Notional amount $ 0 $ 0
Foreign Exchange Forward    
Derivative [Line Items]    
Potential exposure coverage, percent (as a percentage) 90.00%