Fair Value of Financial Instruments (Fair Value Inputs Quantitative Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	$ 231,399	$ 217,146
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	(5,810)	(4,200)
Significant Unobservable Inputs (Level 3) [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	4,313	4,163
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	(3,496)	$ (2,364)
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	1,836
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] | U.S. government bonds [Member] | Fixed maturity AFS securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	8
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	79
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	26
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Reinsurance recoverable [Member] | Other assets [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	474
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Future contract benefits - indexed annuity and IUL contracts embedded derivatives
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	(1,125)
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Other Liabilities GLB Reserves Embedded Derivatives [Member] | Other liabilities [Member]
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	$ (1,877)
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	0.70%
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	3.80%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | U.S. government bonds [Member] | Fixed maturity AFS securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	0.50%
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	1.60%
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	2.20%
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	4.50%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Reinsurance recoverable [Member] | Other assets [Member]
Fair Value Inputs [Abstract]
Lapse Rate	1.00%
Utilization of guaranteed withdrawal	85.00%
Claims Utilization Factor	60.00%
Premiums Utilization Factor	80.00%
NPR	0.03%
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
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] | Other liabilities [Member]
Fair Value Inputs [Abstract]
Lapse Rate	1.00%
Utilization of guaranteed withdrawal	85.00%
Claims Utilization Factor	60.00%
Premiums Utilization Factor	80.00%
NPR	0.03%
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	29.80%
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	3.80%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | U.S. government bonds [Member] | Fixed maturity AFS securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	0.50%
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	4.10%
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	2.20%
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	5.10%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Reinsurance recoverable [Member] | Other assets [Member]
Fair Value Inputs [Abstract]
Lapse Rate	30.00%
Utilization of guaranteed withdrawal	100.00%
Claims Utilization Factor	100.00%
Premiums Utilization Factor	115.00%
NPR	0.51%
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
Fair Value Inputs [Abstract]
Lapse Rate	9.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Other Liabilities GLB Reserves Embedded Derivatives [Member] | Other liabilities [Member]
Fair Value Inputs [Abstract]
Lapse Rate	30.00%
Utilization of guaranteed withdrawal	100.00%
Claims Utilization Factor	100.00%
Premiums Utilization Factor	115.00%
NPR	0.51%
Volatility	29.00%