Contingencies and Other Risks (Details) - USD ($) $ in Millions	3 Months Ended	45 Months Ended
	Dec. 31, 2016	Sep. 30, 2016
Loss Contingencies [Line Items]
Consent Order Fees and Expenses		$ 230
Loss Contingency Accrual		$ 52
Subsequent Event [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Consent Order Fees and Expenses	$ 10
Subsequent Event [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Consent Order Fees and Expenses	$ 15