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Fair Value of Financial Instruments (Fair Value Inputs Quantitative Information) (Details) $ in Millions | Jun. 30, 2021 USD ($) item | Dec. 31, 2020 USD ($)
--- | --- | ---
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ | $ 317,441 | $ 304,561
Liabilities Fair Value Disclosure [Abstract] |  |
Liabilities measured at fair value | $ | (7,997) | (7,091)
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets Fair Value Disclosure [Abstract] |  |
Assets Fair Value Disclosure | $ | 9,715 | 12,068
Liabilities Fair Value Disclosure [Abstract] |  |
Liabilities measured at fair value | $ | (302) | $ (5,627)
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 | $ | 3,678 |
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 | $ | 43 |
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 | $ | 19 |
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 | 0.004 |
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 | 0.010 |
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 | 0.025 |
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 | 0.018 |
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 | 0.076 |
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 | 0.046 |
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 | 0.025 |
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 | 0.018 |
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 | 0.015 |
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 | 0.035 |
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 | 0.025 |
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 | 0.018 |
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 | $ | $ 21 |
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 | 0.061 |
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 | 0.057 |
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 | $ | $ 1,820 |
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 | 0.0006 |
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 |
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 |
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 | 0.0137 |
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 | 0.28 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Direct And 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 Direct And Ceded Embedded Derivatives [Member] | Weighted Average [Member] | Other Assets [Member] | NPR [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.0090 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Direct And Ceded Embedded Derivatives [Member] | Weighted Average [Member] | Other Assets [Member] | Volatility [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative assets, measurement input | 0.1452 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Direct Embedded Derivatives [Member] | Other Liabilities [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Liabilities measured at fair value | $ | $ (152) |
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 | 0.0006 |
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 | 0.30 |
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 |
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 |
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 | 0.0137 |
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 | 0.28 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded 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 Ceded Embedded Derivatives [Member] | Weighted Average [Member] | Other Liabilities [Member] | NPR [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.0090 |
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB Ceded Embedded Derivatives [Member] | Weighted Average [Member] | Other Liabilities [Member] | Volatility [Member] |  |
Liabilities Fair Value Disclosure [Abstract] |  |
Derivative liability, measurement input | 0.1452 |

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