Commitments, Contingencies and Guarantees - Guarantees (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative Guarantee [Member]
Guarantor Obligations [Line Items]
Carrying Value of Net Liability	$ 4,357	$ 3,817
Maximum Payout/Notional Amount by Period of Expiration	201,039	224,201
Derivative Guarantee [Member] \| Maturities, Year 1 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	89,202	91,814
Derivative Guarantee [Member] \| Maturities, Year 2 and Year 3 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	56,204	76,693
Derivative Guarantee [Member] \| Maturities, Year 4 and Year 5 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	23,389	19,377
Derivative Guarantee [Member] \| Maturities, Year 6 and Thereafter [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	32,244	36,317
Securities Lending and Clearing Guarantees [Member]
Guarantor Obligations [Line Items]
Carrying Value of Net Liability
Maximum Payout/Notional Amount by Period of Expiration	21,352	17,891
Securities Lending and Clearing Guarantees [Member] \| Maturities, Year 1 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	21,352	17,891
Securities Lending and Clearing Guarantees [Member] \| Maturities, Year 2 and Year 3 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration
Securities Lending and Clearing Guarantees [Member] \| Maturities, Year 4 and Year 5 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration
Securities Lending and Clearing Guarantees [Member] \| Maturities, Year 6 and Thereafter [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration
Financial Guarantee [Member]
Guarantor Obligations [Line Items]
Carrying Value of Net Liability	253	27
Maximum Payout/Notional Amount by Period of Expiration	7,622	6,126
Financial Guarantee [Member] \| Maturities, Year 1 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	1,263	2,044
Financial Guarantee [Member] \| Maturities, Year 2 and Year 3 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	3,304	1,714
Financial Guarantee [Member] \| Maturities, Year 4 and Year 5 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	2,787	2,219
Financial Guarantee [Member] \| Maturities, Year 6 and Thereafter [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	$ 268	$ 149

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=121555522&loc=d3e12069-110248

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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=121555522&loc=d3e12069-110248

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