Derivatives and Hedging Activities - Credit Derivatives (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	$ 1,100,421	$ 830,043
Maximum Payout/Notional Amount of Purchased Credit Derivatives	1,178,888	915,354
Fair Value of Written Credit Derivatives, Assets	11,580	10,209
Fair Value of Written Credit Derivatives, Liability	4,742	3,498
Fair Value of Written Credit Derivatives, Net asset/(liability)	6,838	6,711
Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	872,679	672,616
Maximum Payout/Notional Amount of Purchased Credit Derivatives	934,935	737,630
Fair Value of Written Credit Derivatives, Assets	6,942	6,169
Fair Value of Written Credit Derivatives, Liability	1,631	1,345
Fair Value of Written Credit Derivatives, Net asset/(liability)	5,311	4,824
Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	227,742	157,427
Maximum Payout/Notional Amount of Purchased Credit Derivatives	243,953	177,724
Fair Value of Written Credit Derivatives, Assets	4,638	4,040
Fair Value of Written Credit Derivatives, Liability	3,111	2,153
Fair Value of Written Credit Derivatives, Net asset/(liability)	1,527	1,887
Offsetting
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	938,655	677,320
Offsetting \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	749,482	549,513
Offsetting \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	189,173	127,807
Other
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	240,233	238,034
Other \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	185,453	188,117
Other \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	54,780	49,917
Less than 1 year
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	288,764	222,314
Less than 1 year \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	240,424	184,830
Less than 1 year \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	48,340	37,484
1 - 5 years
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	625,820	556,705
1 - 5 years \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	487,719	447,318
1 - 5 years \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	138,101	109,387
Greater than 5 years
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	185,837	51,024
Greater than 5 years \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	144,536	40,468
Greater than 5 years \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	41,301	10,556
Credit default swaps
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	870,759	661,176
Credit default swaps \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	684,455	536,846
Credit default swaps \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	186,304	124,330
Other credit derivatives
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	229,662	168,867
Other credit derivatives \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	188,224	135,770
Other credit derivatives \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	$ 41,438	$ 33,097

Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4K
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of purchased credit protection expected to cover future payments under the credit risk derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4K
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K

+ Details

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Period Type:	duration

- Definition

Fair value of credit risk derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4K
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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- Definition

Fair value of credit risk derivative liability.

+ References

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- Definition

Fair value of credit risk derivative asset after deduction of credit risk derivative liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4K
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K

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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/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

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