Offsetting Assets and Liabilities (Summary of the Fair Value of Client Securities Available to Utilize as Collateral and Amounts Pledged) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Securities Financing Transaction [Line Items]
Fair value of client securities available to be pledged	$ 23,023	$ 21,516
Fair value of client securities pledged	5,489	5,193
Securities Lending to Other Broker-Dealers [Member]
Securities Financing Transaction [Line Items]
Fair value of client securities pledged	1,295	1,626
Fulfillment of Client Short Sales [Member]
Securities Financing Transaction [Line Items]
Fair value of client securities pledged	2,225	2,048
Fulfillment of Requirements with Options Clearing Corporation [Member]
Securities Financing Transaction [Line Items]
Fair value of client securities pledged	1,969	1,519
Fully Paid Client Securities [Member]
Securities Financing Transaction [Line Items]
Fair value of client securities pledged	$ 104	$ 58

Fair value of collateral permitted, by contact or custom, to be sold or re-pledged.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729

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Fair value of the collateral, or portion thereof, that has been re-pledged, delivered, or otherwise used.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729

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+ References

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