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Acquisitions (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2010
EUR (€)
Jun. 30, 2011
USD ($)
Dec. 31, 2010
USD ($)
Jun. 30, 2010
USD ($)
Dec. 31, 2009
USD ($)
Jun. 30, 2011
Bank of Ireland Asset Management [Member]
USD ($)
Mar. 31, 2011
Bank of Ireland Asset Management [Member]
USD ($)
Jun. 30, 2011
Intesa Sanpaolo's Securities Services [Member]
USD ($)
Assessment for taxes, penalties and interest € 130,000,000              
Goodwill resulting from acquisition           31,000,000   932,000,000
Other intangible assets   2,616,000,000 2,593,000,000 2,731,000,000 1,810,000,000 27,000,000   848,000,000
Contingent asset   59,000,000 72,000,000          
Acquired BIAM assets under management             $ 23,000,000,000