Acquisitions	12 Months Ended
Dec. 31, 2012
Business Acquisition, Entity Acquired and Reason for Acquisition [Abstract]
Acquisitions	Acquisitions On October 15, 2012, we completed our acquisition of Goldman Sachs Administration Services, or GSAS, for a total purchase price of approximately $550 million, subject to certain adjustments. GSAS is a global hedge-fund service provider with approximately $200 billion of single manager hedge-fund assets under administration in locations worldwide. We acquired GSAS to expand our hedge-fund servicing and administration capabilities and our overall presence in non-U.S. markets. In connection with the acquisition, we recorded goodwill of approximately $290 million, approximately half of which is not expected to be tax deductible, and other intangible assets of approximately $257 million, in our consolidated statement of condition. The hedge-fund assets are not recorded in our consolidated financial statements. Results of operations of the acquired GSAS business are included in our consolidated financial statements beginning on October 15, 2012. In November 2011 and October 2011, respectively, we completed our acquisitions of Pulse Trading, Inc., a full-service agency brokerage firm based in Boston, Massachusetts, and Complementa Investment-Controlling AG, an investment performance measurement and analytics firm based in Switzerland. Both transactions were cash acquisitions financed through available capital. We acquired Pulse Trading to enhance the electronic-trading technology we provide to our institutional clients. Our acquisition of Pulse Trading included its institutional equities business. Complementa provides services associated with asset consolidation, investment performance measurement, investment controlling and investment consulting for institutional and large private investors, and has offices in Switzerland, Germany and Liechtenstein. We acquired Complementa to enhance our investment analytics capabilities and our overall presence in key markets in Europe. Our acquisition of Complementa included its wholly-owned asset management software provider. In connection with the Pulse and Complementa acquisitions, we recorded aggregate goodwill of approximately $68 million, substantially all of which is not expected to be tax deductible, and aggregate other intangible assets of approximately $67 million, in our consolidated statement of condition. Results of operations of the acquired Pulse Trading and Complementa businesses are included in our consolidated financial statements beginning on their respective dates of acquisition. In January 2011, we completed our acquisition of Bank of Ireland's asset management business, or BIAM, in a cash acquisition financed through available capital. We acquired BIAM to enhance SSgA's range of investment management solutions and expand our overall presence in Ireland, where we already provide services to institutional clients, to provide a range of investment management products. In connection with the acquisition, we recorded goodwill of approximately $31 million, substantially all of which is not expected to be tax deductible, and other intangible assets of approximately $27 million, in our consolidated statement of condition. The acquisition added approximately $23 billion to our assets under management as of March 31, 2011. The assets under management are not recorded in our consolidated financial statements. Results of operations of the acquired BIAM business are included in our consolidated financial statements beginning on the date of acquisition.

Acquisitions

12 Months Ended

Dec. 31, 2012

Business Acquisition, Entity Acquired and Reason for Acquisition [Abstract]

On October 15, 2012, we completed our acquisition of Goldman Sachs Administration Services, or GSAS, for a total purchase price of approximately $550 million, subject to certain adjustments. GSAS is a global hedge-fund service provider with approximately $200 billion of single manager hedge-fund assets under administration in locations worldwide. We acquired GSAS to expand our hedge-fund servicing and administration capabilities and our overall presence in non-U.S. markets. In connection with the acquisition, we recorded goodwill of approximately $290 million, approximately half of which is not expected to be tax deductible, and other intangible assets of approximately $257 million, in our consolidated statement of condition. The hedge-fund assets are not recorded in our consolidated financial statements. Results of operations of the acquired GSAS business are included in our consolidated financial statements beginning on October 15, 2012.

In November 2011 and October 2011, respectively, we completed our acquisitions of Pulse Trading, Inc., a full-service agency brokerage firm based in Boston, Massachusetts, and Complementa Investment-Controlling AG, an investment performance measurement and analytics firm based in Switzerland. Both transactions were cash acquisitions financed through available capital. We acquired Pulse Trading to enhance the electronic-trading technology we provide to our institutional clients. Our acquisition of Pulse Trading included its institutional equities business. Complementa provides services associated with asset consolidation, investment performance measurement, investment controlling and investment consulting for institutional and large private investors, and has offices in Switzerland, Germany and Liechtenstein. We acquired Complementa to enhance our investment analytics capabilities and our overall presence in key markets in Europe. Our acquisition of Complementa included its wholly-owned asset management software provider.

In connection with the Pulse and Complementa acquisitions, we recorded aggregate goodwill of approximately $68 million, substantially all of which is not expected to be tax deductible, and aggregate other intangible assets of approximately $67 million, in our consolidated statement of condition. Results of operations of the acquired Pulse Trading and Complementa businesses are included in our consolidated financial statements beginning on their respective dates of acquisition.

In January 2011, we completed our acquisition of Bank of Ireland's asset management business, or BIAM, in a cash acquisition financed through available capital. We acquired BIAM to enhance SSgA's range of investment management solutions and expand our overall presence in Ireland, where we already provide services to institutional clients, to provide a range of investment management products. In connection with the acquisition, we recorded goodwill of approximately $31 million, substantially all of which is not expected to be tax deductible, and other intangible assets of approximately $27 million, in our consolidated statement of condition. The acquisition added approximately $23 billion to our assets under management as of March 31, 2011. The assets under management are not recorded in our consolidated financial statements. Results of operations of the acquired BIAM business are included in our consolidated financial statements beginning on the date of acquisition.