Financial Instruments Significant Unobservable Inputs (Details) (Income Approach Valuation Technique)	6 Months Ended
	Jun. 30, 2012
Derivative Financial Instruments, Liabilities | Stabilizer / MCG | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Interest Rate Implied Volatility	0.00%	[1]
Nonperformance risk	0.25%	[1]
Actuarial Assumptions, Lapses	0.00%	[1]
Actuarial Assumptions, Policyholder deposits	0.00%	[1]
Derivative Financial Instruments, Liabilities | Stabilizer / MCG | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Interest Rate Implied Volatility	4.00%	[1]
Nonperformance risk	3.50%	[1]
Actuarial Assumptions, Lapses	55.00%	[1]
Actuarial Assumptions, Policyholder deposits	15.00%	[1],[2]
Investment contract | Fixed indexed annuities (FIA) | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Nonperformance risk	0.25%	[1]
Actuarial Assumptions, Lapses	0.00%	[1]
Investment contract | Fixed indexed annuities (FIA) | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Nonperformance risk	3.50%	[1]
Actuarial Assumptions, Lapses	10.00%	[1]

[1] The range of reasonable assumptions that management has used in its fair value calculations.

[2] Measured as a percentage of assets under management or assets under administration.