Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments - Other Unfunded Commitments and Standby Letters of Credit (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Standby and Other Letters of Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Standby and other letters of credit, carrying value	$ 588	$ 550
Carrying values for allowance of lending-related commitments	147	123
Guarantee liability and corresponding asset	441	427
Maximum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Secured clearance advance facility outstanding commitment	$ 2,400	$ 2,900

Secured clearance advance facility outstanding commitment

No definition available.

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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

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.

+ Details

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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

+ Details

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- Details

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- Details

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