Variable Interest Entities	6 Months Ended
Jun. 30, 2015
Variable Interest Entities [Abstract]
Variable Interest Entities	Variable Interest Entities For additional information on our variable interest entities, or VIEs, refer to note 12 on pages 162 to 164 of the 2014 Form 10-K. Tax-Exempt Investment Program: In the normal course of our business, we structure and sell certificated interests in pools of tax-exempt investment-grade assets, principally to our mutual fund clients. We structure these pools as partnership trusts, and the assets and liabilities of the trusts are recorded in our consolidated statement of condition as investment securities available for sale and other short-term borrowings. As of June 30, 2015 and December 31, 2014, we carried investment securities available for sale, composed of securities related to state and political subdivisions, with a fair value of $2.18 billion and $2.27 billion, respectively, and other short-term borrowings of $1.83 billion and $1.87 billion, respectively, in our consolidated statement of condition in connection with these trusts. The interest revenue and interest expense generated by the investments and certificated interests, respectively, are recorded as components of net interest revenue when earned or incurred. The trusts had a weighted-average life of approximately 5.5 years as of June 30, 2015, compared to approximately 5.9 years as of December 31, 2014. Under separate legal agreements, we provide standby bond-purchase agreements to these trusts and, with respect to certain securities, letters of credit. Our commitments to the trusts under these standby bond-purchase agreements and letters of credit totaled $1.83 billion and $639 million, respectively, as of June 30, 2015, none of which was utilized as of that date. Interests in Sponsored Investment Funds: As of June 30, 2015, the aggregate assets and liabilities of our consolidated sponsored investment fund totaled $768 million and $716 million, respectively. As of December 31, 2014, the aggregate assets and liabilities of our consolidated sponsored investment fund totaled $65 million and $13 million, respectively. As of June 30, 2015 our potential maximum total exposure associated with the consolidated sponsored investment fund totaled $52 million and represented the value of our economic ownership interest in the fund. As of June 30, 2015 and December 31, 2014, we managed certain sponsored investment funds, considered VIEs, in which we held a variable interest but for which we were not deemed to be the primary beneficiary. Our potential maximum loss exposure related to these unconsolidated funds totaled $70 million and $45 million as of June 30, 2015 and December 31, 2014, respectively, and represented the carrying value of our seed capital investment, which is recorded in either investment securities available for sale or other assets in our consolidated statement of condition. The amount of loss we may recognize during any period is limited to the carrying amount of our seed capital investment in the unconsolidated fund.

Variable Interest Entities

For additional information on our variable interest entities, or VIEs, refer to note 12 on pages 162 to 164 of the 2014 Form 10-K.

Tax-Exempt Investment Program:

In the normal course of our business, we structure and sell certificated interests in pools of tax-exempt investment-grade assets, principally to our mutual fund clients. We structure these pools as partnership trusts, and the assets and liabilities of the trusts are recorded in our consolidated statement of condition as investment securities available for sale and other short-term borrowings. As of June 30, 2015 and December 31, 2014, we carried investment securities available for sale, composed of securities related to state and political subdivisions, with a fair value of $2.18 billion and $2.27 billion, respectively, and other short-term borrowings of $1.83 billion and $1.87 billion, respectively, in our consolidated statement of condition in connection with these trusts. The interest revenue and interest expense generated by the investments and certificated interests, respectively, are recorded as components of net interest revenue when earned or incurred.

The trusts had a weighted-average life of approximately 5.5 years as of June 30, 2015, compared to approximately 5.9 years as of December 31, 2014.

Under separate legal agreements, we provide standby bond-purchase agreements to these trusts and, with respect to certain securities, letters of credit. Our commitments to the trusts under these standby bond-purchase agreements and letters of credit totaled $1.83 billion and $639 million, respectively, as of June 30, 2015, none of which was utilized as of that date.

Interests in Sponsored Investment Funds:

As of June 30, 2015, the aggregate assets and liabilities of our consolidated sponsored investment fund totaled $768 million and $716 million, respectively. As of December 31, 2014, the aggregate assets and liabilities of our consolidated sponsored investment fund totaled $65 million and $13 million, respectively.

As of June 30, 2015 our potential maximum total exposure associated with the consolidated sponsored investment fund totaled $52 million and represented the value of our economic ownership interest in the fund.

As of June 30, 2015 and December 31, 2014, we managed certain sponsored investment funds, considered VIEs, in which we held a variable interest but for which we were not deemed to be the primary beneficiary. Our potential maximum loss exposure related to these unconsolidated funds totaled $70 million and $45 million as of June 30, 2015 and December 31, 2014, respectively, and represented the carrying value of our seed capital investment, which is recorded in either investment securities available for sale or other assets in our consolidated statement of condition. The amount of loss we may recognize during any period is limited to the carrying amount of our seed capital investment in the unconsolidated fund.