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Loans TDR modifications (parenthetical) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Financing Receivable, Impaired [Line Items]        
PrincipalForgivenessRestructuringImpact $ 2 $ 1 $ 2 $ 1