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Acquisition and Restructuring Costs (Activity Related to Restructuring-Related Accruals) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Acquisition and restructuring costs $ 17 $ 41 $ 36 $ 54
Beginning balance     137  
Additional restructuring-related accruals     9  
Payments and adjustments     (53)  
Ending balance 93   93  
Intesa, Mourant International Finance Administration and BIAM [Member]
       
Acquisition and restructuring costs 13   27  
Business Operations and Information Technology Transformation Program [Member]
       
Acquisition and restructuring costs 4   9  
Number of employees involuntarily terminated     425  
Employee-Related Costs [Member]
       
Beginning balance     90  
Additional restructuring-related accruals     6  
Payments and adjustments     (49)  
Ending balance 47   47  
Real Estate Consolidation [Member]
       
Beginning balance     47  
Additional restructuring-related accruals     3  
Payments and adjustments     (4)  
Ending balance $ 46   $ 46