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Fair Value of Financial Instruments (Fair Value Inputs Quantitative Information) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ 245,265 | $ 224,673
Liabilities Fair Value Disclosure [Abstract] |  |
Liabilities measured at fair value | (3,689) | (4,397)
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | 5,197 | 3,747
Liabilities Fair Value Disclosure [Abstract] |  |
Liabilities measured at fair value | $ (2,058) | $ (2,202)
Significant Unobservable Inputs (Level 3) [Member] | GLB Ceded Embedded Derivatives [Member] | Maximum [Member] | Other liabilities [Member] |  |
Fair Value Inputs [Abstract] |  |
Utilization of guaranteed withdrawal | 100.00% |
Claims Utilization Factor | 100.00% |
Premiums Utilization Factor | 115.00% |
NPR | 0.25% |
Volatility | 29.00% |
Significant Unobservable Inputs (Level 3) [Member] | GLB Ceded Embedded Derivatives [Member] | Minimum [Member] | Other liabilities [Member] |  |
Fair Value Inputs [Abstract] |  |
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] | Corporate Bonds [Member] | Fixed maturity AFS securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ 2,411 |
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 | 21.00% |
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 | 0.50% |
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 | $ 78 |
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 | 1.80% |
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 | 1.80% |
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 | $ 22 |
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 | $ 954 |
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 | 0.25% |
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] | Indexed annuity and embedded derivatives [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ 11 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Indexed annuity and 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] | Indexed annuity and embedded derivatives [Member] | Minimum [Member] |  |
Fair Value Inputs [Abstract] |  |
Lapse Rate | 1.00% |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Future contract benefits - indexed annuity and IUL contracts embedded derivatives [Member] | Future contract benefits [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Liabilities measured at fair value | $ (1,418) |
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] | Future contract benefits [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] | Future contract benefits [Member] |  |
Fair Value Inputs [Abstract] |  |
Lapse Rate | 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 | $ (67) |
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% |
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% |

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- Definition Estimated probability of a contract surrendering during a year, used as an input to measure fair value. + References No definition available. + Details
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- Definition Rate at which liquidity premiums, expected durations, structures and credit quality would be applied to the market observable infomration of an investment, used as an input to measure fair value. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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