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Loans and Allowance for Credit Losses (Impaired Loans) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Impaired Loans        
Impaired loans with allowance $ 141 $ 104    
Impaired loans without allowance 157 241    
Impaired loans unpaid principal balance 309 354    
Impaired loans 298 345    
Allowance for loan losses 306 274 $ 323 $ 225
Americas        
Impaired Loans        
Impaired loans 279 320    
Allowance for loan losses 274 245    
EMEA        
Impaired Loans        
Impaired loans 9 9    
Allowance for loan losses 30 28    
Asia-Pacific        
Impaired Loans        
Impaired loans 10 16    
Allowance for loan losses 2 1    
Corporate        
Impaired Loans        
Impaired loans with allowance 141 104    
Impaired loans without allowance 122 206    
Impaired loans unpaid principal balance 273 316    
Allowance for loan losses 211 195 252 166
Residential Real Estate        
Impaired Loans        
Impaired loans with allowance 0 0    
Impaired loans without allowance 35 35    
Impaired loans unpaid principal balance 36 38    
Allowance for loan losses $ 21 $ 20 $ 18 $ 17