Fair Value of Financial Instruments (Fair Value Inputs Quantitative Information) (Details) (USD $) In Millions, unless otherwise specified										3 Months Ended					3 Months Ended						3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Corporate Bonds [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Foreign Government Bonds [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Hybrid And Redeemable Preferred Securities [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Equity AFS Securities [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Indexed Annuity Contracts Embedded Derivatives [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Minimum [Member] Corporate Bonds [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Minimum [Member] Foreign Government Bonds [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Minimum [Member] Hybrid And Redeemable Preferred Securities [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Minimum [Member] Equity AFS Securities [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Minimum [Member] Indexed Annuity Contracts Embedded Derivatives [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Maximum [Member] Corporate Bonds [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Maximum [Member] Foreign Government Bonds [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Maximum [Member] Hybrid And Redeemable Preferred Securities [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Maximum [Member] Equity AFS Securities [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Discounted Cash Flow Valuation Technique [Member] Maximum [Member] Indexed Annuity Contracts Embedded Derivatives [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Monte Carlo Simulation Valuation Technique [Member] GLB Embedded Derivative Reserves [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Monte Carlo Simulation Valuation Technique [Member] Minimum [Member] GLB Embedded Derivative Reserves [Member]	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Monte Carlo Simulation Valuation Technique [Member] Maximum [Member] GLB Embedded Derivative Reserves [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	$ 192,836	$ 187,710	$ 4,211	$ 4,055	$ 1,061	$ 76	$ 21	$ 14
Liquidity Duration Adjustment										0.50%	2.30%	2.10%	4.30%		13.90%	4.20%	2.50%	4.50%
Liabilities Fair Value Disclosure [Abstract]
Liabilities Fair Value Disclosure	$ 2,577	$ 3,198	$ 1,175	$ 1,780					$ (853)											$ (199)
Fair Value Inputs [Abstract]
Lapse Rate														1.00%					15.00%		1.00%	27.00%
Utilization of guaranteed withdrawal																					90.00%	100.00%
NPR																						0.53%
Fair Value Assumptions Expected Volatility Rate																					1.00%	35.00%