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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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- Definition

Indicates line item in statement of financial position that includes accrued interest, after allowance for credit loss, on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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- Definition

Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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AVAILABLE-FOR-SALE SECURITIES, Narrative (Details) $ in Millions	12 Months Ended
	Sep. 30, 2024 USD ($) investmentPosition	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Accrued interest on available-for-sale securities, location	Other Receivables	Other Receivables
Fair value	$ 8,260	$ 9,181
Proceeds from sales of available-for-sale securities	$ 0	0	$ 52
Debt securities \| Equity \| Investment concentration risk \| Federal National Home Mortgage Association investments
Debt Securities, Available-for-sale [Line Items]
Concentration risk (greater than)	10.00%
Debt securities \| Equity \| Investment concentration risk \| Federal Home Loan Mortgage Corporation investments
Debt Securities, Available-for-sale [Line Items]
Concentration risk (greater than)	10.00%
Bank
Debt Securities, Available-for-sale [Line Items]
Accrued interest on available-for-sale securities	$ 23	28
Average expected duration, available for sale securities	3 years 9 months 18 days
Amortized cost basis	$ 8,906	10,433
Fair value	$ 8,260	9,181
Bank \| Agency MBS and CMOs
Debt Securities, Available-for-sale [Line Items]
Number of available-for-sale investment positions determined to be in an unrealized loss position \| investmentPosition	960
Number of available-for-sale investment positions determined to be in an unrealized loss position continuously for less than 12 months \| investmentPosition	29
Number of available-for-sale investment positions determined to be in an unrealized loss position continuously for 12 months or more \| investmentPosition	931
Proceeds from sales of available-for-sale securities	$ 0	$ 0	$ 52
Bank \| Federal National Mortgage Association (FNMA)
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	4,200
Fair value	3,850
Bank \| Federal Home Loan Mortgage Corporation (FHLMC)
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	2,550
Fair value	$ 2,310