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COLLATERALIZED AGREEMENTS AND FINANCINGS, Collateral (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Sep. 30, 2025
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Collateral Received that Can be Resold or Repledged [Abstract] |  |
Collateral we received that was available to be delivered or repledged | $ 4,974 | $ 4,003
Collateral that we delivered or repledged | $ 2,221 | $ 2,080

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- Definition Fair value of collateral permitted, by contact or custom, to be sold or re-pledged. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A + Details
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- Definition Fair value of the collateral, or portion thereof, that has been re-pledged, delivered, or otherwise used. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A + Details
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