Business Changes and Developments - Subsequent Events (Details 3) (Mortgage Foreclosure Investigations and Litigation [Member], Subsequent Event [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Jan. 07, 2013 Cash Payment [Member]	Jan. 07, 2013 Foreclosure Prevention Commitment Actions [Member]
Subsequent Event [Line Items]
Loss Contingency, Settlement Agreement, Consideration		$ 753.0	$ 1,200.0
Loss Contingency, Loss in Period	$ 700