Commitments, Contingencies and Guarantees - Guarantees (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivative Guarantee [Member]
Guarantor Obligations [Line Items]
Carrying Value of Net Liability	$ 9,524	$ 8,351
Maximum Payout/Notional Amount by Period of Expiration	741,799	926,443
Derivative Guarantee [Member] \| Maturities, Year 1 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	148,983	640,288
Derivative Guarantee [Member] \| Maturities, Year 2 and Year 3 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	374,101	168,784
Derivative Guarantee [Member] \| Maturities, Year 4 and Year 5 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	143,847	67,643
Derivative Guarantee [Member] \| Maturities, Year 6 and Thereafter [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	74,868	49,728
Securities Lending Indemnification [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	38,386	31,902
Securities Lending Indemnification [Member] \| Maturities, Year 1 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	38,386	31,902
Financial Guarantee [Member]
Guarantor Obligations [Line Items]
Carrying Value of Net Liability	65	76
Maximum Payout/Notional Amount by Period of Expiration	3,245	4,461
Financial Guarantee [Member] \| Maturities, Year 1 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	193	611
Financial Guarantee [Member] \| Maturities, Year 2 and Year 3 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	1,336	1,402
Financial Guarantee [Member] \| Maturities, Year 4 and Year 5 [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	1,247	1,772
Financial Guarantee [Member] \| Maturities, Year 6 and Thereafter [Member]
Guarantor Obligations [Line Items]
Maximum Payout/Notional Amount by Period of Expiration	$ 469	$ 676

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6851643&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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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