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Fair Value of Financial Instruments (Fair Value Inputs Quantitative Information) (Details) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | ---
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ 249,473,000,000 | $ 233,897,000,000
Liabilities Fair Value Disclosure [Abstract] |  |
Liabilities measured at fair value | (2,674,000,000) | (1,793,000,000)
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | 6,183,000,000 | 5,490,000,000
Liabilities Fair Value Disclosure [Abstract] |  |
Liabilities measured at fair value | (2,143,000,000) | $ (1,476,000,000)
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Equity Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ 21,000,000 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Equity Securities [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Equity securities, measurement input | 0.045 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Equity Securities [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Equity securities, measurement input | 0.052 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ 2,604,000,000 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | ABS [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | 23,000,000 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Foreign Government Bonds [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | 77,000,000 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Hybrid And Redeemable Preferred Securities [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ 4,000,000 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Minimum [Member] | Corporate Bonds [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Fixed maturity AFS and trading securities, measurement input | 0.006 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Minimum [Member] | ABS [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Fixed maturity AFS and trading securities, measurement input | 0.030 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Minimum [Member] | Foreign Government Bonds [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Fixed maturity AFS and trading securities, measurement input | 0.014 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Minimum [Member] | Hybrid And Redeemable Preferred Securities [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Fixed maturity AFS and trading securities, measurement input | 0.016 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Maximum [Member] | Corporate Bonds [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Fixed maturity AFS and trading securities, measurement input | 0.300 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Maximum [Member] | ABS [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Fixed maturity AFS and trading securities, measurement input | 0.030 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Maximum [Member] | Foreign Government Bonds [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Fixed maturity AFS and trading securities, measurement input | 0.031 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Maximum [Member] | Hybrid And Redeemable Preferred Securities [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Fixed maturity AFS and trading securities, measurement input | 0.016 |
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 | $ 489,000,000 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Minimum [Member] | Other Assets [Member] | Long-Term Lapse Rate [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.01 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Minimum [Member] | Other Assets [Member] | Utilization Of Guaranteed Withdrawls [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.85 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Minimum [Member] | Other Assets [Member] | Claims Utilization Factor [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.60 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Minimum [Member] | Other Assets [Member] | Premiums Utilization Factor [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.80 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Minimum [Member] | Other Assets [Member] | NPR [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.0002 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Minimum [Member] | Other Assets [Member] | Volatility [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.01 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Maximum [Member] | Other Assets [Member] | Long-Term Lapse Rate [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.30 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Maximum [Member] | Other Assets [Member] | Utilization Of Guaranteed Withdrawls [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 1.00 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Maximum [Member] | Other Assets [Member] | Claims Utilization Factor [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 1.00 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Maximum [Member] | Other Assets [Member] | Premiums Utilization Factor [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 1.15 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Maximum [Member] | Other Assets [Member] | NPR [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.0032 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Maximum [Member] | Other Assets [Member] | Volatility [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.29 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Indexed Annuity And IUL Contracts [Member] | Other Assets [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ 872,000,000 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Indexed Annuity And IUL Contracts [Member] | Minimum [Member] | Other Assets [Member] | Long-Term Lapse Rate [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.01 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Indexed Annuity And IUL Contracts [Member] | Maximum [Member] | Other Assets [Member] | Long-Term Lapse Rate [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.09 |
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 | $ (1,730,000,000) |
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] | Long-Term Lapse Rate [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.01 |
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] | Long-Term Lapse Rate [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.09 |
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 | $ (8,000,000) |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | Long-Term Lapse Rate [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.01 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | Utilization Of Guaranteed Withdrawls [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.85 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | Claims Utilization Factor [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.60 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | Premiums Utilization Factor [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.80 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | NPR [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.0002 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | Volatility [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.01 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Long-Term Lapse Rate [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.3000 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Utilization Of Guaranteed Withdrawls [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 1.00 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Claims Utilization Factor [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 1.00 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Premiums Utilization Factor [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 1.15 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | NPR [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.0032 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Volatility [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.29 |

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