Fair Value of Financial Instruments (Fair Value Inputs Quantitative Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	$ 217,146	$ 221,209
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	(4,200)	(3,517)
Significant Unobservable Inputs (Level 3) [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	4,163	4,149
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	(2,364)	$ (1,602)
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	1,314
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | ABS [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	25
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	77
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] | Available-for-sale equity securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	27
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Other Assets Reinsurance Recoverable [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	268
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Future contract benefits - indexed annuity and IUL contracts embedded derivatives | Future contract benefits [Member]
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	(1,100)
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	$ (953)
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	0.10%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | ABS [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	3.30%
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	1.90%
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	2.10%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Available-for-sale equity 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 Assets Reinsurance Recoverable [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	0.02%
Volatility	1.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Future contract benefits - indexed annuity and IUL contracts embedded derivatives | Future contract benefits [Member]
Fair Value Inputs [Abstract]
Lapse Rate	1.00%
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	0.02%
Volatility	1.00%
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	11.70%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | ABS [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	3.30%
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	4.40%
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	2.10%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Available-for-sale equity securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	8.80%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Other Assets Reinsurance Recoverable [Member]
Fair Value Inputs [Abstract]
Lapse Rate	30.00%
Utilization of guaranteed withdrawal	100.00%
Claims Utilization Factor	100.00%
Premiums Utilization Factor	120.00%
NPR	0.38%
Volatility	29.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Future contract benefits - indexed annuity and IUL contracts embedded derivatives | Future contract benefits [Member]
Fair Value Inputs [Abstract]
Lapse Rate	15.00%
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	120.00%
NPR	0.38%
Volatility	29.00%