Commitments, Contingencies and Guarantees - Guarantees (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative Guarantee [Member]
Guarantor Obligations [Line Items]
Carrying Value of Net Liability	$ 3,406	$ 4,357
Maximum Payout/Notional Amount by Period of Expiration	166,197	201,039
Derivative Guarantee [Member] \| Maturities, Year 1 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	68,212	89,202
Derivative Guarantee [Member] \| Maturities, Year 2 and Year 3 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	48,273	56,204
Derivative Guarantee [Member] \| Maturities, Year 4 and Year 5 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	19,706	23,389
Derivative Guarantee [Member] \| Maturities, Year 6 and Thereafter [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	30,006	32,244
Securities Lending and Clearing Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	11,046	21,352
Securities Lending and Clearing Guarantees [Member] \| Maturities, Year 1 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	11,046	21,352
Financial Guarantee [Member]
Guarantor Obligations [Line Items]
Carrying Value of Net Liability	234	253
Maximum Payout/Notional Amount by Period of Expiration	6,591	7,622
Financial Guarantee [Member] \| Maturities, Year 1 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	871	1,263
Financial Guarantee [Member] \| Maturities, Year 2 and Year 3 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	3,608	3,304
Financial Guarantee [Member] \| Maturities, Year 4 and Year 5 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	2,015	2,787
Financial Guarantee [Member] \| Maturities, Year 6 and Thereafter [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	$ 97	$ 268

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

+ Details

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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

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

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