Fair Value of Assets and Liabilities (Quantiative Info for Level 3 Inputs) (Details) (USD $) In Millions, unless otherwise specified					9 Months Ended
	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2012 Corporate Debt Securities [Member] Maximum [Member] Market Approach Valuation Tech [Member] Fair Value, Inputs, Level 3 [Member]		Sep. 30, 2012 Corporate Debt Securities [Member] Maximum [Member] Income Approach Valuation [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Corporate Debt Securities [Member] Maximum [Member] Cost Approach Valuation Technique [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Corporate Debt Securities [Member] Maximum [Member] Cap At Call Price [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Corporate Debt Securities [Member] Minimum [Member] Market Approach Valuation Tech [Member] Fair Value, Inputs, Level 3 [Member]		Sep. 30, 2012 Corporate Debt Securities [Member] Minimum [Member] Income Approach Valuation [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Corporate Debt Securities [Member] Minimum [Member] Cost Approach Valuation Technique [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Corporate Debt Securities [Member] Minimum [Member] Cap At Call Price [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Corporate Debt Securities [Member] Weighted Average [Member] Market Approach Valuation Tech [Member] Fair Value, Inputs, Level 3 [Member]		Sep. 30, 2012 Corporate Debt Securities [Member] Weighted Average [Member] Income Approach Valuation [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Corporate Debt Securities [Member] Weighted Average [Member] Cost Approach Valuation Technique [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Corporate Debt Securities [Member] Weighted Average [Member] Cap At Call Price [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Asset-backed Securities [Member] Maximum [Member] Income Approach Valuation [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Asset-backed Securities [Member] Minimum [Member] Income Approach Valuation [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Asset-backed Securities [Member] Weighted Average [Member] Income Approach Valuation [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Separate Accounts Commercial Mortgage Loan [Member] Maximum [Member] Income Approach Valuation [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Separate Accounts Commercial Mortgage Loan [Member] Minimum [Member] Income Approach Valuation [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Separate Accounts Commercial Mortgage Loan [Member] Weighted Average [Member] Income Approach Valuation [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Future Policy Benefits [Member] Maximum [Member] Income Approach Valuation [Member] Fair Value, Inputs, Level 3 [Member]		Sep. 30, 2012 Future Policy Benefits [Member] Minimum [Member] Income Approach Valuation [Member] Fair Value, Inputs, Level 3 [Member]		Sep. 30, 2012 Separate Account Real Estate [Member] Maximum [Member] Market Approach Valuation Tech [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Separate Account Real Estate [Member] Minimum [Member] Market Approach Valuation Tech [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Separate Account Real Estate [Member] Weighted Average [Member] Market Approach Valuation Tech [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value Quantiative Information [Line Items]
Discount Rate							17.50%					1.40%					10.66%													12.00%	6.25%	7.90%
Liquidity Premium																				2.75%	0.50%	1.32%
Prepayment Rate																				20.00%	2.80%	6.17%
Default Rate																				2.50%	0.50%	0.77%
Loss Severity																				40.00%	35.00%	35.49%
EBITDA					8.5	[1]				5.4	[1]				6.9	[1]
Volatility Curve																										34.00%		19.00%
Credit Risk																							5.67%	1.70%	2.05%
Call Price									101.00%					100.00%					100.19%
Liquidation Value								93.80%					25.00%					83.53%
Average Life																				4.73	0.1	2.81
Comparable Spreads																				20.00%	0.30%	2.89%
Comparable Security Yields																				21.90%	0.38%	10.54%
Cap Rate																														10.50%	4.75%	6.57%
Yield To Maturity																														7.64%	2.17%	4.75%
Market Spread Over Base Rate																														4.51%	1.81%	3.30%
Lapse Rate																										14.00%		0.00%
NPR Spread																										1.82%		0.24%
Utilization Rate																										94.00%		70.00%
Withdrawal Rate																										100.00%		85.00%
Mortality Rate																										13.00%	[2]	0.00%	[2]
Fixed maturities, available for sale, at fair value	$ 273,381	[3]	$ 254,648	[3]

[1] EBITDA multiples represent multiples of earnings before interest, taxes, depreciation and amortization, and are amounts used when the reporting entity has determined that market participants would use such multiples when pricing the investments.

[2] Range reflects the mortality rate for the vast majority of business with living benefits, with policyholders ranging from 35 to 90 years old. While the majority of living benefits have a minimum age requirement, certain benefits do not have an age restriction. This results in contractholders for certain benefits with mortality rates approaching 0%

[3]          (1) See Note 5 for details of balances associated with variable interest entities.