Contingencies and Other Matters - Regulatory Matters (Details) (Unfavorable Regulatory Action [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Sep. 30, 2009
Loss Contingencies [Line Items]
Loss Contingency Accrual, Carrying Value, Payments		$ 10,000,000
Loss Contingency Accrual, Carrying Value, Provision	77,000,000
Loss Contingency Accrual Carrying Value, Provision, After Tax	51,000,000
Prior claims [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Carrying Value, Provision	48,000,000
Prior claims [Member] | Regulatory Surcharges [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Carrying Value, Provision	750,000
Prior claims [Member] | Claims Handling Expenses [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Carrying Value, Provision	9,500,000
Prior claims [Member] | Fines [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Carrying Value, Provision	925,000
Current Claims [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Carrying Value, Provision	$ 29,000,000