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Fair Value of Financial Instruments (Fair Value Inputs Quantitative Information) (Details) $ in Millions | Mar. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($)
--- | --- | ---
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ | $ 251,606 | $ 270,478
Liabilities Fair Value Disclosure [Abstract] |  |
Liabilities measured at fair value | $ | (8,431) | (4,306)
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ | 9,886 | 8,602
Liabilities Fair Value Disclosure [Abstract] |  |
Liabilities measured at fair value | $ | (7,162) | $ (3,461)
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ | 799 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Future Contract Benefits [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Liabilities measured at fair value | $ | (1,380) |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Other Liabilities [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Liabilities measured at fair value | $ | (4,596) |
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 | $ | 2,690 |
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 | $ | 47 |
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 | $ | 20 |
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 |
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 | 0.007 |
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 | 0.053 |
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 | 0.060 |
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 | 0.030 |
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 | 0.188 |
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 | 0.080 |
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 | 0.060 |
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 | 0.030 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Weighted Average [Member] | Corporate Bonds [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Fixed maturity AFS and trading securities, measurement input | 0.029 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Weighted Average [Member] | Foreign Government Bonds [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Fixed maturity AFS and trading securities, measurement input | 0.068 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Weighted Average [Member] | ABS [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Fixed maturity AFS and trading securities, measurement input | 0.060 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Fixed Maturity AFS Securities [Member] | Weighted Average [Member] | Hybrid And Redeemable Preferred Securities [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Fixed maturity AFS and trading securities, measurement input | 0.030 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Equity Securities [Member] | Equity 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 Securities [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] | Equity Securities [Member] | Maximum [Member] | Equity Securities [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Equity securities, measurement input | 0.073 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Equity Securities [Member] | Weighted Average [Member] | Equity Securities [Member] | Liquidity/Duration Adjustment [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Equity securities, measurement input | 0.067 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Other Assets [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ | $ 728 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB 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 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 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 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 Ceded Embedded Derivatives [Member] | Minimum [Member] | Other Assets [Member] | NPR [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.0003 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB 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 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 Ceded Embedded Derivatives [Member] | Maximum [Member] | Other Assets [Member] | Utilization Of Guaranteed Withdrawls [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 1 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Maximum [Member] | Other Assets [Member] | Claims Utilization Factor [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 1 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB 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 Ceded Embedded Derivatives [Member] | Maximum [Member] | Other Assets [Member] | NPR [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.0035 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Maximum [Member] | Other Assets [Member] | Volatility [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.28 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Weighted Average [Member] | Other Assets [Member] | Utilization Of Guaranteed Withdrawls [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.94 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Weighted Average [Member] | Other Assets [Member] | NPR [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.0027 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Weighted Average [Member] | Other Assets [Member] | Volatility [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.1372 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Indexed Annuity And IUL Contracts [Member] | Minimum [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] | 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] | 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 Direct 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 Direct 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 Direct 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 Direct 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 Direct Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | NPR [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.0003 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Direct 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 Direct Embedded Derivatives [Member] | Maximum [Member] | Long-Term Lapse Rate [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.30 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Direct Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Utilization Of Guaranteed Withdrawls [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 1 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Direct Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Claims Utilization Factor [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 1 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Direct 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 Direct Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | NPR [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.0035 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Direct Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Volatility [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.28 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Direct Embedded Derivatives [Member] | Weighted Average [Member] | Other Liabilities [Member] | Utilization Of Guaranteed Withdrawls [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.94 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Direct Embedded Derivatives [Member] | Weighted Average [Member] | Other Liabilities [Member] | NPR [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.0027 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Direct Embedded Derivatives [Member] | Weighted Average [Member] | Other Liabilities [Member] | Volatility [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.1372 |

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