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Segment information - Summary of Segment Information (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Sales Information [Line Items]      
Average Assets $ 86,665 $ 83,662 $ 81,913
Business Banking [Member]
     
Sales Information [Line Items]      
Average Assets 5,242 5,080 4,980
Commercial Banking [Member]
     
Sales Information [Line Items]      
Average Assets 22,523 21,655 21,272
Commercial Real Estate [Member]
     
Sales Information [Line Items]      
Average Assets 16,937 17,150 17,054
Discretionary Portfolio [Member]
     
Sales Information [Line Items]      
Average Assets 18,581 16,480 16,585
Residential Mortgage Banking [Member]
     
Sales Information [Line Items]      
Average Assets 3,157 2,858 2,847
Retail Banking [Member]
     
Sales Information [Line Items]      
Average Assets 10,155 10,997 11,391
All Other [Member]
     
Sales Information [Line Items]      
Average Assets $ 10,070 $ 9,442 $ 7,784