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Fair Value of Financial Instruments (Fair Value Inputs Quantitative Information) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	$ 239,770	$ 224,673
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	(3,458)	(4,397)
Significant Unobservable Inputs (Level 3) [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	4,262	3,747
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	(1,823)	$ (2,202)
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	$ 2,008
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Corporate bonds [Member] | Maximum [Member] | Fixed maturity AFS securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	11.50%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Corporate bonds [Member] | Minimum [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] | ABS [Member] | Fixed maturity AFS securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	$ 24
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | ABS [Member] | Maximum [Member] | Fixed maturity AFS securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	3.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | ABS [Member] | Minimum [Member] | Fixed maturity AFS securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	3.00%
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] | Foreign government bonds [Member] | Maximum [Member] | Fixed maturity AFS securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	3.40%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Foreign government bonds [Member] | Minimum [Member] | Fixed maturity AFS securities [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	1.70%
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	$ 4
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Hybrid and redeemable preferred securities [Member] | Maximum [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] | Hybrid and redeemable preferred securities [Member] | Minimum [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] | Equity AFS securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	$ 23
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Equity AFS securities [Member] | Maximum [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	4.90%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Equity AFS securities [Member] | Minimum [Member]
Assets Fair Value Disclosure [Abstract]
Liquidity Duration Adjustment	4.50%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Other assets [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	$ 623
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Maximum [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	0.27%
Volatility	29.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Minimum [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	0.01%
Volatility	1.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB ceded embedded derivatives [Member] | Other liabilities [Member]
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	$ (7)
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB ceded embedded derivatives [Member] | Maximum [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	0.27%
Volatility	29.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB ceded embedded derivatives [Member] | Minimum [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	0.01%
Volatility	1.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Indexed annuity and embedded derivatives [Member] | Other assets [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure	$ 3
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Indexed annuity and embedded derivatives [Member] | Maximum [Member] | Other assets [Member]
Fair Value Inputs [Abstract]
Lapse Rate	9.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Indexed annuity and embedded derivatives [Member] | Minimum [Member] | Other assets [Member]
Fair Value Inputs [Abstract]
Lapse Rate	0.40%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Future contract benefits - indexed annuity and IUL contracts embedded derivatives [Member]
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value	$ (1,318)
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Future contract benefits - indexed annuity and IUL contracts embedded derivatives [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Lapse Rate	9.00%
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Future contract benefits - indexed annuity and IUL contracts embedded derivatives [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Lapse Rate	0.40%

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- Definition

The factor applied to the present value of claims in the GLB reserve calculation to estimate the impact of inefficient withdrawal behavior including taking less than or more than the maximum guaranteed withdrawal.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value.

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Fair value of financial and nonfinancial obligations.

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