Contingencies and Other Matters - Legal and Regulatory Matters (Details) (USD $)		3 Months Ended	12 Months Ended	3 Months Ended
	Dec. 31, 2013 Pending Litigation [Member]	Mar. 31, 2013 Unfavorable Regulatory Action [Member]	Dec. 31, 2009 Unfavorable Regulatory Action [Member]	Mar. 31, 2013 Unfavorable Regulatory Action [Member] Prior Claims [Member]	Mar. 31, 2013 Unfavorable Regulatory Action [Member] Prior Claims [Member] Regulatory Surcharges [Member]	Mar. 31, 2013 Unfavorable Regulatory Action [Member] Prior Claims [Member] Claims Handling Expenses [Member]	Mar. 31, 2013 Unfavorable Regulatory Action [Member] Prior Claims [Member] Fines [Member]	Mar. 31, 2013 Insurance-related Assessments [Member] Current Claims [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value	$ 189,000,000
Loss Contingency Accrual At Carrying Value, Net Of Tax	123,000,000
Loss Contingency Accrual, Carrying Value, Payments			10,000,000
Loss Contingency Accrual, Carrying Value, Provision		(77,000,000)		(48,000,000)	(925,000)	(750,000)	(9,500,000)	(29,000,000)
Loss Contingency Accrual Carrying Value, Provision, After Tax		$ 51,000,000