Reinsurance Reinsurance (Details Textual) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Premiums Receivable, Allowance for Doubtful Accounts	$ 248,000,000		$ 248,000,000		$ 244,000,000
Life Insurance Recoveries on Ceded Reinsurance Contracts	212,000,000	0	427,000,000	0
Reinsurance Recoverables	22,949,000,000		22,949,000,000		23,330,000,000
Property and Casualty Ceded Losses which Reduce Losses and Loss Adjustment Expenses Incurred	231,000,000			336,000,000
Percentage of Stockholders' Equity to Credit Concentration Risk	10.00%		10.00%
Individual Life [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance Recoverables	0		0
Individual Life [Member] | Prudential [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Fair Value of Assets Held in Trust	0		0
Retirement Plans [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance Recoverables	0		0
Retirement Plans [Member] | Mass Mutual [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Fair Value of Assets Held in Trust	$ 0		$ 0