Derivatives and Hedging Activities - Credit Derivatives (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	$ 830,043	$ 601,494
Maximum Payout/Notional Amount of Purchased Credit Derivatives	915,354	678,077
Fair Value of Written Credit Derivatives, Assets	10,209	7,183
Fair Value of Written Credit Derivatives, Liability	3,498	2,744
Fair Value of Written Credit Derivatives, Net asset/(liability)	6,711	4,439
Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	672,616	425,770
Maximum Payout/Notional Amount of Purchased Credit Derivatives	737,630	473,091
Fair Value of Written Credit Derivatives, Assets	6,169	4,351
Fair Value of Written Credit Derivatives, Liability	1,345	663
Fair Value of Written Credit Derivatives, Net asset/(liability)	4,824	3,688
Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	157,427	175,724
Maximum Payout/Notional Amount of Purchased Credit Derivatives	177,724	204,986
Fair Value of Written Credit Derivatives, Assets	4,040	2,832
Fair Value of Written Credit Derivatives, Liability	2,153	2,081
Fair Value of Written Credit Derivatives, Net asset/(liability)	1,887	751
Offsetting
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	677,320	497,655
Offsetting \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	549,513	384,749
Offsetting \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	127,807	112,906
Other
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	238,034	180,422
Other \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	188,117	88,342
Other \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	49,917	92,080
Less than 1 year
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	222,314	164,778
Less than 1 year \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	184,830	103,200
Less than 1 year \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	37,484	61,578
1 - 5 years
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	556,705	404,528
1 - 5 years \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	447,318	294,124
1 - 5 years \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	109,387	110,404
Greater than 5 years
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	51,024	32,188
Greater than 5 years \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	40,468	28,446
Greater than 5 years \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	10,556	3,742
Credit default swaps
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	661,176	483,723
Credit default swaps \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	536,846	357,277
Credit default swaps \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	124,330	126,446
Other credit derivatives
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	168,867	117,771
Other credit derivatives \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	135,770	68,493
Other credit derivatives \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	$ 33,097	$ 49,278

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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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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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Balance Type:	debit
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- Definition

Fair value of credit risk derivative liability.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- 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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