Fair Value of Financial Instruments (Fair Value Inputs Quantitative Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	226,425	$ 221,209
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	(4,158)	(3,517)
Significant Unobservable Inputs (Level 3) [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	4,286	4,149
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	(2,077)	(1,602)
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Other Assets GLB Reserves Embedded Derivatives And Reinsurance Recoverable [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	204
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	1,344
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Asset-backed Securities [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	26
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	80
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	20
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Equity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	28
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Other Liabilities GLB Reserves Embedded Derivatives [Member]
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	(552)
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Future Contract Benefits Indexed Annuity And Universal Life Contracts Embedded Derivatives [Member] | Future contract benefits [Member]
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	(1,180)
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Other Assets GLB Reserves Embedded Derivatives [Member]
Fair Value Inputs [Abstract]
Lapse Rate	1.00%
Utilization of guaranteed withdrawal	90.00%
Claims Utilization Factor	60.00%
Premiums Utilization Factor	70.00%
NPR	0.00%
Volatility	1.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	0.80%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Asset-backed Securities [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	3.20%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	2.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	2.40%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Equity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	4.30%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Other Liabilities GLB Reserves Embedded Derivatives [Member]
Fair Value Inputs [Abstract]
Lapse Rate	1.00%
Utilization of guaranteed withdrawal	90.00%
Claims Utilization Factor	60.00%
Premiums Utilization Factor	70.00%
NPR	0.00%
Volatility	1.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Future Contract Benefits Indexed Annuity And Universal Life Contracts Embedded Derivatives [Member] | Future contract benefits [Member]
Fair Value Inputs [Abstract]
Lapse Rate	1.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Other Assets GLB Reserves Embedded Derivatives [Member]
Fair Value Inputs [Abstract]
Lapse Rate	30.00%
Utilization of guaranteed withdrawal	100.00%
Claims Utilization Factor	100.00%
Premiums Utilization Factor	140.00%
NPR	0.35%
Volatility	28.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	11.20%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Asset-backed Securities [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	3.20%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	4.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	2.40%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Equity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	5.80%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Other Liabilities GLB Reserves Embedded Derivatives [Member]
Fair Value Inputs [Abstract]
Lapse Rate	30.00%
Utilization of guaranteed withdrawal	100.00%
Claims Utilization Factor	100.00%
Premiums Utilization Factor	140.00%
NPR	0.35%
Volatility	28.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Future Contract Benefits Indexed Annuity And Universal Life Contracts Embedded Derivatives [Member] | Future contract benefits [Member]
Fair Value Inputs [Abstract]
Lapse Rate	15.00%