XML 75 R63.htm IDEA: XBRL DOCUMENT v3.7.0.1
Loans and asset quality - Credit Quality Indicators - Wealth Management Loans and Mortgages - Credit Risk Profile by Internally Assigned Grade (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Loans $ 60,868 $ 64,458
Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans 2,890 2,617
Commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans 4,717 4,654
Financial institutions    
Financing Receivable, Recorded Investment [Line Items]    
Loans 13,341 14,689
Wealth management mortgages    
Financing Receivable, Recorded Investment [Line Items]    
Loans 8,568 8,267
Wealth management loans and mortgages    
Financing Receivable, Recorded Investment [Line Items]    
Loans 16,023 15,654
Investment grade | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans 2,697 2,397
Investment grade | Commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans 3,903 3,823
Investment grade | Financial institutions    
Financing Receivable, Recorded Investment [Line Items]    
Loans 10,255 11,459
Investment grade | Wealth management loans    
Financing Receivable, Recorded Investment [Line Items]    
Loans 7,300 7,127
Non-investment grade | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans 193 220
Non-investment grade | Commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans 814 831
Non-investment grade | Financial institutions    
Financing Receivable, Recorded Investment [Line Items]    
Loans 3,086 3,230
Non-investment grade | Wealth management loans    
Financing Receivable, Recorded Investment [Line Items]    
Loans $ 155 $ 260