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Commitments, Guarantees and Contingencies - Obligations under Guarantee Arrangements (Details) $ in Millions	Sep. 30, 2025 USD ($)
Non-credit derivatives
Guarantees
Carrying Amount Asset (Liability)	$ (33,866)
Non-credit derivatives | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	1,449,384
Non-credit derivatives | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	714,985
Non-credit derivatives | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	211,871
Non-credit derivatives | Over 5 (Years)
Guarantees
Maximum potential payout/notional	560,807
Standby letters of credit and other financial guarantees issued
Guarantees
Carrying Amount Asset (Liability)	14
Standby letters of credit	700
Allowance for credit loss	59
Standby letters of credit and other financial guarantees issued | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	1,558
Standby letters of credit and other financial guarantees issued | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	734
Standby letters of credit and other financial guarantees issued | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	1,547
Standby letters of credit and other financial guarantees issued | Over 5 (Years)
Guarantees
Maximum potential payout/notional	2,543
Liquidity facilities
Guarantees
Carrying Amount Asset (Liability)	2
Liquidity facilities | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	2,834
Liquidity facilities | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	0
Liquidity facilities | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	0
Liquidity facilities | Over 5 (Years)
Guarantees
Maximum potential payout/notional	0
Whole loan sales guarantees
Guarantees
Carrying Amount Asset (Liability)	0
Whole loan sales guarantees | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	61
Whole loan sales guarantees | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	17
Whole loan sales guarantees | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	0
Whole loan sales guarantees | Over 5 (Years)
Guarantees
Maximum potential payout/notional	23,077
Securitization representations and warranties
Guarantees
Carrying Amount Asset (Liability)	0
Securitization representations and warranties | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	0
Securitization representations and warranties | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	0
Securitization representations and warranties | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	0
Securitization representations and warranties | Over 5 (Years)
Guarantees
Maximum potential payout/notional	94,468
General partner guarantees
Guarantees
Carrying Amount Asset (Liability)	(102)
General partner guarantees | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	208
General partner guarantees | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	109
General partner guarantees | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	72
General partner guarantees | Over 5 (Years)
Guarantees
Maximum potential payout/notional	20
Client clearing guarantees
Guarantees
Carrying Amount Asset (Liability)	0
Client clearing guarantees | Less Than 1 (Year)
Guarantees
Maximum potential payout/notional	2,126
Client clearing guarantees | 1 - 3 (Years)
Guarantees
Maximum potential payout/notional	0
Client clearing guarantees | 3 - 5 (Years)
Guarantees
Maximum potential payout/notional	0
Client clearing guarantees | Over 5 (Years)
Guarantees
Maximum potential payout/notional	$ 0

X

- Definition

Guarantor Obligations, (Assets) Current Carrying Value

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Long-term Line of Credit, Allowance for Credit Loss

+ References

No definition available.

+ Details

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X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

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X

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

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X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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- Details

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