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Business Combinations (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Mar. 31, 2012
Pending Acquisition [Member]
NumberofBusinesses
|
Dec. 31, 2011
C P Equity LLC, Denver, Colorado [Member]
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Dec. 31, 2011
Certain assets of Foreign Currency Exchange Corp, Orlando, Florida [Member]
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Dec. 31, 2011
LaCrosse Holdings, LLC, Minneapolis, Minnesota [Member]
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Dec. 31, 2011
Other Acquired Companies [Member]
NumberofBusinesses
|
Dec. 31, 2010
Other Acquired Companies [Member]
NumberofBusinesses
|
Dec. 31, 2009
Other Acquired Companies [Member]
NumberofBusinesses
|
Dec. 31, 2010
Certain assets of GMAC Commercial Finance, LLC, New York, New York [Member]
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Dec. 31, 2009
Capital TempFunds, Fort Lauderdale, Florida [Member]
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| Business Acquisition [Line Items] | ||||||||||||
| Business Acquisition, Purchase Price Allocation, Assets Acquired | $ 588 | $ 470 | $ 113 | $ 835 | $ 389 | $ 46 | $ 116 | $ 37 | $ 40 | $ 39 | $ 430 | $ 74 |
| Date | July 1 | August 1 | November 30 | April 30 | March 2 | |||||||
| Various Dates | Various | Various | Various | |||||||||
| Business Combinations (Textuals) [Abstract] | ||||||||||||
| Business Acquisition, Number Completed during period | 2 | 7 | 5 | 8 | ||||||||