Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Pending Litigation
Commitments and Contingencies
Reasonably possible losses in excess of recorded litigation liability			$ 20
Reserves amount associated with legal and regulatory contingencies	23	2	23
Compensatory damages awarded by the jury to a borrower, defendant in a lawsuit			0.5
Punitive damages awarded by the jury to a borrower, defendant in a lawsuit			15.7
Damages awarded by the jury to a borrower, defendant in a lawsuit			$ 16.2