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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).

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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 after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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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	3 Months Ended		9 Months Ended
	Jun. 30, 2025 USD ($) security	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) security	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)
Debt Securities, Available-for-sale [Line Items]
Accrued interest excluded	$ 19		$ 19		$ 23
Accrued interest on available-for-sale securities, location	Other receivables, net		Other receivables, net		Other receivables, net
Duration, available for sale securities (in years)			3 years 10 months 24 days
Number of available-for-sale securities determined to be in an unrealized loss position \| security	794		794
Number of available-for-sale securities determined to be in an unrealized loss position continuously for less than 12 months \| security	17		17
Number of available-for-sale securities determined to be in an unrealized loss position continuously for 12 months or more \| security	777		777
Debt securities, amortized cost basis	$ 7,757		$ 7,757		$ 8,906
Available-for-sale securities, fair value	7,165		7,165		$ 8,260
Proceeds from sales of available-for-sale securities	0	$ 0	78	$ 0
Losses reclassified from AOCI			2
Federal National Mortgage Association (FNMA)
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost basis	3,660		3,660
Available-for-sale securities, fair value	3,350		3,350
Federal Home Loan Mortgage Corporation (FHLMC)
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost basis	2,280		2,280
Available-for-sale securities, fair value	$ 2,050		$ 2,050
Debt securities \| Equity \| Investment concentration risk \| Federal National Home Mortgage Association investments
Debt Securities, Available-for-sale [Line Items]
Concentration risk percentage			10.00%
Debt securities \| Equity \| Investment concentration risk \| Federal Home Loan Mortgage Corporation investments
Debt Securities, Available-for-sale [Line Items]
Concentration risk percentage			10.00%