Loans TDR modifications (parenthetical) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012 ones	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
PrincipalForgivenessRestructuringImpact	$ 2	$ 9	$ 17
NumberOfLoansDischargedButNotReaffirmedInChapter7BankruptcyMovedToNonaccrual		4,231
LoansDischargedButNotReaffirmedInChapter7BankruptcyMovedtoNonaccrual		$ 201