Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments - Standby Letters of Credit and Other Financial Guarantees (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2013
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Total lending-related commitments	$ 950,997	$ 940,395	$ 929,678
Allowance for lending-related commitments	275	148
Standby letters of credit, unissued commitments	45,600
Derivatives qualifying as guarantees
Notional amount on stable value contracts	63,662,000	50,659,000
Standby and Other Letters of Credit
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Standby and other letters of credit, carrying value	672	550
Standby and other letters of credit, allowance	118	123
Guarantor obligations, current carrying value	554	427
Standby letters of credit and other financial guarantees
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Investment-grade	37,709	31,751
Noninvestment-grade	6,563	7,382
Total lending-related commitments	44,272	39,133
Allowance for lending-related commitments	117	121
Commitments with collateral	$ 20,750	18,825
Percentage exceeding value of securities for obtaining cash or other highly liquid collateral	100.00%
Other letters of credit
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Investment-grade	$ 3,476	3,290
Noninvestment-grade	855	651
Total lending-related commitments	4,331	3,941
Allowance for lending-related commitments	1	2
Commitments with collateral	1,509	996
Derivatives qualifying as guarantees
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Guarantor obligations, current carrying value	80	222
Derivatives qualifying as guarantees
Total notional value of derivatives the Firm deems guarantees	53,589	53,784
Notional amount on stable value contracts	27,500	28,400
Maximum exposure to loss	2,900	3,000
Derivative qualifying as guarantees payables	102	236
Derivative qualifying as guarantees receivables	$ 22	$ 14

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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- Definition

This element represents the payables portion of types of derivative financial instruments qualifying as guarantees which are financial instruments or other contractual arrangements with all three of the following characteristics: (a) it has (1) one or more underlyings and (2) one or more notional amounts or payment provisions or both. Those terms determine the amount of the settlement or settlements, and, in some cases, whether or not a settlement is required; (b) it requires no initial net investment or an initial net investment that is smaller than would be required for other types of contracts that would be expected to have a similar response to changes in market factors; and (c) its terms require or permit net settlement, it can readily be settled net by a means outside the contract, or it provides for delivery of an asset that puts the recipient in a position not substantially different from net settlement. Notwithstanding the above characteristics, loan commitments that relate to the origination of mortgage loans that will be held for sale shall be accounted for as derivative instruments by the issuer of the loan commitment (that is, the potential lender).

+ References

No definition available.

+ Details

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- Definition

This element represents the receivables portion of types of derivative financial instruments qualifying as guarantees which are financial instruments or other contractual arrangements with all three of the following characteristics: (a) it has (1) one or more underlyings and (2) one or more notional amounts or payment provisions or both. Those terms determine the amount of the settlement or settlements, and, in some cases, whether or not a settlement is required; (b) it requires no initial net investment or an initial net investment that is smaller than would be required for other types of contracts that would be expected to have a similar response to changes in market factors; and (c) its terms require or permit net settlement, it can readily be settled net by a means outside the contract, or it provides for delivery of an asset that puts the recipient in a position not substantially different from net settlement. Notwithstanding the above characteristics, loan commitments that relate to the origination of mortgage loans that will be held for sale shall be accounted for as derivative instruments by the issuer of the loan commitment (that is, the potential lender).

+ References

No definition available.

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- Definition

Derivatives maximum exposure to loss.

+ References

No definition available.

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- Definition

Derivatives Qualifying as Guarantees [Abstract]

+ References

No definition available.

+ Details

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- Definition

The contractual amount of off-balance sheet lending-related financial instruments (e.g., commitments and guarantees), which represents the maximum possible credit risk should the counterparty draw upon the commitment or the entity be required to fulfill its obligation under the guarantee, and the counterparty subsequently fail to perform according to the terms of the contract.

+ References

No definition available.

+ Details

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- Definition

The contractual amount of others letters of credit supported by collateral.

+ References

No definition available.

+ Details

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- Definition

The percentage of cash or other highly liquid collateral obtained by the Firm as part of an indemnification agreement relative to the value of securities on loan from the borrower as part of a securities lending program.

+ References

No definition available.

+ Details

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- Definition

Allowance for lending-related commitments for standby and other letters of credit.

+ References

No definition available.

+ Details

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- Definition

Carrying value of standby and other letters of credit, which represents the allowance for lending-related commitments plus the fair value of the guarantee liability.

+ References

No definition available.

+ Details

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- Definition

Standby letters of credit and other financial guarantees and other letters of credit.

+ References

No definition available.

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- Definition

Standby letters of credit and other financial guarantees which are rated as investment-grade per company defined internal payment/performance risk groupings used for managing risk.

+ References

No definition available.

+ Details

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- Definition

Standby letters of credit and other financial guarantees which are rated as noninvestment-grade per company defined internal payment/performance risk groupings used for managing risk.

+ References

No definition available.

+ Details

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- Definition

Unissued standby letter of credit commitments.

+ References

No definition available.

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- Definition

The contractual amount of standby letters of credit supported by collateral.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

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

+ 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 (c)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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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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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

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