Derivatives and Hedging Activities - Credit Derivatives (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	$ 1,064,261	$ 830,043
Maximum Payout/Notional Amount of Purchased Credit Derivatives	1,111,199	915,354
Fair Value of Written Credit Derivatives, Assets	11,670	10,209
Fair Value of Written Credit Derivatives, Liability	3,225	3,498
Fair Value of Written Credit Derivatives, Net asset/(liability)	8,445	6,711
Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	863,830	672,616
Maximum Payout/Notional Amount of Purchased Credit Derivatives	900,806	737,630
Fair Value of Written Credit Derivatives, Assets	7,047	6,169
Fair Value of Written Credit Derivatives, Liability	1,048	1,345
Fair Value of Written Credit Derivatives, Net asset/(liability)	5,999	4,824
Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	200,431	157,427
Maximum Payout/Notional Amount of Purchased Credit Derivatives	210,393	177,724
Fair Value of Written Credit Derivatives, Assets	4,623	4,040
Fair Value of Written Credit Derivatives, Liability	2,177	2,153
Fair Value of Written Credit Derivatives, Net asset/(liability)	2,446	1,887
Offsetting
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	867,530	677,320
Offsetting \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	716,384	549,513
Offsetting \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	151,146	127,807
Other
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	243,669	238,034
Other \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	184,422	188,117
Other \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Purchased Credit Derivatives	59,247	49,917
Less than 1 year
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	320,289	222,314
Less than 1 year \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	260,246	184,830
Less than 1 year \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	60,043	37,484
1 - 5 years
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	687,802	556,705
1 - 5 years \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	556,168	447,318
1 - 5 years \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	131,634	109,387
Greater than 5 years
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	56,170	51,024
Greater than 5 years \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	47,416	40,468
Greater than 5 years \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	8,754	10,556
Credit default swaps
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	822,239	661,176
Credit default swaps \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	671,070	536,846
Credit default swaps \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	151,169	124,330
Other credit derivatives
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	242,022	168,867
Other credit derivatives \| Investment-Grade
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	192,760	135,770
Other credit derivatives \| Non-Investment- Grade/Unrated
Derivative [Line Items]
Maximum Payout/Notional Amount of Written Credit Derivatives	$ 49,262	$ 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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- 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

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- Definition

Fair value of credit risk derivative asset.

+ References

Reference 1: 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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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-Name Accounting Standards Codification
-Section 50
-Paragraph 4K
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K

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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 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-5A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-Publisher FASB
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Reference 3: 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

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