Long-Term Debt (Narrative) (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014
Extinguishment Of Debt [Line Items]
Loss on early extinguishment of debt	$ 122,000,000	$ 0	$ 2,000,000
Federal Home Loan Bank Advances to Branch Bank [Member]
Extinguishment Of Debt [Line Items]
Loss on early extinguishment of debt				122,000,000
Extinguishment of long term debt, amount				$ 1,100,000,000