Commitments, Contingencies and Guarantees - Guarantees (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivatives
Guarantor Obligations [Line Items]
Carrying Value of Net Liability	$ 2,855	$ 3,535
Maximum Payout/Notional Amount by Period of Expiration	383,725	309,252
Carrying value of derivatives included derivative assets	663	464
Carrying value of derivatives included derivative liabilities	3,520	4,000
Derivatives \| Maturities Year One
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	69,846	181,940
Derivatives \| Maturities Year Two And Three
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	245,139	78,419
Derivatives \| Maturities Year Four And Five
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	30,413	17,074
Derivatives \| Maturities Year Six And Thereafter
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	38,327	31,819
Securities lending and clearing
Guarantor Obligations [Line Items]
Carrying Value of Net Liability	0	0
Maximum Payout/Notional Amount by Period of Expiration	150,523	58,056
Securities lending and clearing \| Maturities Year One
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	150,523	58,056
Securities lending and clearing \| Maturities Year Two And Three
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	0	0
Securities lending and clearing \| Maturities Year Four And Five
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	0	0
Securities lending and clearing \| Maturities Year Six And Thereafter
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	0	0
Other financial guarantees
Guarantor Obligations [Line Items]
Carrying Value of Net Liability	422	425
Maximum Payout/Notional Amount by Period of Expiration	8,120	7,957
Other financial guarantees \| Maturities Year One
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	1,328	2,523
Other financial guarantees \| Maturities Year Two And Three
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	3,460	3,086
Other financial guarantees \| Maturities Year Four And Five
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	2,656	1,843
Other financial guarantees \| Maturities Year Six And Thereafter
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	$ 676	$ 505

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-10

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: 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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- 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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- 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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