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BANK DEPOSITS (Tables)
 6 Months Ended
Mar. 31, 2024
Deposits [Abstract]  
Summary of Bank Deposits The following table presents a summary of bank deposits, excluding affiliate deposits, as well as the weighted-average interest rates on such deposits. The calculation of the weighted-average rates was based on the actual deposit balances and rates at each respective period end.
March 31, 2024September 30, 2023
$ in millionsBalanceWeighted-average rateBalanceWeighted-average rate
Money market and savings accounts$31,094 2.11 %$32,268 1.85 %
Interest-bearing demand deposits20,784 4.97 %18,376 4.98 %
Certificates of deposit2,471 4.68 %2,831 4.41 %
Non-interest-bearing demand deposits494 — 724 — 
Total bank deposits$54,843 3.32 %$54,199 3.06 %
Bank Deposits by Insured and Uninsured
The following table details the amount of total bank deposits (which excludes affiliate deposits) that are FDIC-insured, as well as the amount that exceeded the FDIC insurance limit at each respective period end.
$ in millionsMarch 31, 2024September 30, 2023
FDIC-insured bank deposits$48,268 $48,344 
Bank deposits exceeding FDIC insurance limit (1) (2)
6,575 5,855 
Total bank deposits$54,843 $54,199 
FDIC-insured bank deposits as a % of total bank deposits88 %89 %

(1)Bank deposits that exceeded the FDIC insurance limit were calculated in accordance with applicable regulatory reporting requirements.
(2)Excluded affiliate deposits exceeding the FDIC insurance limit of $888 million and $764 million as of March 31, 2024 and September 30, 2023, respectively.
Scheduled Maturities of Certificates of Deposit
The following table sets forth the amount of certificates of deposit that exceeded the FDIC insurance limit, categorized by the time remaining until maturity, as of March 31, 2024.
$ in millionsMarch 31, 2024
Three months or less
$72 
Over three through six months
38 
Over six through twelve months
42 
Over twelve months13 
Total certificates of deposit that exceeded the FDIC insurance limit (1)
$165 

(1)Total certificates of deposit that exceeded the FDIC insurance limit were calculated in accordance with applicable regulatory reporting requirements.
Interest Expense on Deposits
Interest expense on deposits, excluding interest expense related to affiliate deposits, is summarized in the following table.
Three months ended March 31,Six months ended March 31,
$ in millions2024202320242023
Money market and savings accounts$159 $128 $315 $245 
Interest-bearing demand deposits252 62 495 109 
Certificates of deposit30 16 62 24 
Total interest expense on deposits$441 $206 $872 $378