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Loans and Allowance for Credit Losses (Impaired Loans) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Impaired Loans    
Loans: With allowance $ 15 $ 16
Loans: Without allowance 118 163
Loans: UPB 146 192
Lending Commitments: Without allowance 226 199
Impaired loans 133 179
Allowance for loan losses 243 224
Americas    
Impaired Loans    
Impaired loans 129 160
Allowance for loan losses 199 194
EMEA    
Impaired Loans    
Impaired loans 0 9
Allowance for loan losses 42 27
Asia    
Impaired Loans    
Impaired loans 4 10
Allowance for loan losses 2 3
Corporate    
Impaired Loans    
Loans: With allowance 15 16
Loans: Without allowance 69 118
Loans: UPB 95 146
Lending Commitments: Without allowance 226 199
Residential Real Estate    
Impaired Loans    
Loans: With allowance 0 0
Loans: Without allowance 49 45
Loans: UPB 51 46
Lending Commitments: Without allowance $ 0 $ 0