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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Quantitative Information for Level 3 Inputs) (Details) $ in Millions | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | ---
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Assets, Fair Value Disclosure | $ 50,258 | $ 52,245
Asset-backed Securities [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Assets, Fair Value Disclosure | $ 92 | $ 101
Asset-backed Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.03 | 0.01
Asset-backed Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.18 | 0.04
Asset-backed Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Corporate Debt Securities [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Assets, Fair Value Disclosure | $ 1,030 | $ 1,070
Corporate Debt Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.01 | 0.01
Corporate Debt Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.02 | 0.02
Corporate Debt Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Funds Withheld At Interest Embedded Derivatives [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Assets, Fair Value Disclosure | $ (109) | $ 121
US Government Agencies Debt Securities [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Assets, Fair Value Disclosure | $ 15 | $ 16
US Government Agencies Debt Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.01 | 0.01
US Government Agencies Debt Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.01 | 0.01
US Government Agencies Debt Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Foreign Government Debt [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Assets, Fair Value Disclosure | $ 15 | $ 16
Equity Securities [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Assets, Fair Value Disclosure | $ 29 | $ 32
Equity Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Equity Securities, FV-NI, Measurement Input | 0.04 | 0.04
Equity Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Equity Securities, FV-NI, Measurement Input | 0.04 | 0.04
Equity Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Equity Securities, FV-NI, Measurement Input | 0.04 | 0.04
Embedded Derivatives In Indexed Annuity [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 751 | $ 768
Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.02 | 0.02
Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.04 | 0.04
Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.02 | 0.02
Embedded Derivatives In Variable Annuity [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 291 | $ 163
Debt Security, Corporate, Non-US [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.01 | 0.01
Debt Security, Corporate, Non-US [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.01 | 0.01
Debt Security, Corporate, Non-US [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Measurement Input, Long-term Revenue Growth Rate [Member] | Embedded Derivatives In Variable Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.12 | 0.12
Measurement Input, Long-term Revenue Growth Rate [Member] | Embedded Derivatives In Variable Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.27 | 0.27
Measurement Input, Long-term Revenue Growth Rate [Member] | Embedded Derivatives In Variable Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.00 | 0.00
Measurement Input Mortality Improvement [Member] | Longevity Swap [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Measurement Input Mortality Improvement [Member] | Longevity Swap [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Measurement Input Mortality Improvement [Member] | Longevity Swap [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Measurement Input Crediting Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.02 | 0.02
Measurement Input Crediting Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.04 | 0.04
Measurement Input Crediting Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.02 | 0.02
Measurement Input, Counterparty Credit Risk [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.01 | 0.01
Measurement Input, Counterparty Credit Risk [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.05 | 0.05
Measurement Input, Counterparty Credit Risk [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.00 | 0.00
Measurement Input, Counterparty Credit Risk [Member] | Embedded Derivatives In Variable Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.01 | 0.01
Measurement Input, Counterparty Credit Risk [Member] | Embedded Derivatives In Variable Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.05 | 0.05
Measurement Input, Counterparty Credit Risk [Member] | Embedded Derivatives In Variable Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.00 | 0.00
Measurement Input, Withdrawal Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.03 | 0.03
Measurement Input, Withdrawal Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.05 | 0.05
Measurement Input, Withdrawal Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.00 | 0.00
Measurement Input, Withdrawal Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.03 | 0.03
Measurement Input, Withdrawal Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.05 | 0.05
Measurement Input, Withdrawal Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.00 | 0.00
Measurement Input, Withdrawal Rate [Member] | Embedded Derivatives In Variable Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.06 | 0.05
Measurement Input, Withdrawal Rate [Member] | Embedded Derivatives In Variable Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.07 | 0.07
Measurement Input, Withdrawal Rate [Member] | Embedded Derivatives In Variable Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.00 | 0.00
Measurement Input, Lapse Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.14 | 0.13
Measurement Input, Lapse Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.35 | 0.35
Measurement Input, Lapse Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.00 | 0.00
Measurement Input, Lapse Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.14 | 0.13
Measurement Input, Lapse Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.35 | 0.35
Measurement Input, Lapse Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.00 | 0.00
Measurement Input, Lapse Rate [Member] | Embedded Derivatives In Variable Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.04 | 0.05
Measurement Input, Lapse Rate [Member] | Embedded Derivatives In Variable Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.25 | 0.25
Measurement Input, Lapse Rate [Member] | Embedded Derivatives In Variable Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.00 | 0.00
Measurement Input, Mortality Rate [Member] | Longevity Swap [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Measurement Input, Mortality Rate [Member] | Longevity Swap [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Measurement Input, Mortality Rate [Member] | Longevity Swap [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Measurement Input, Mortality Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.02 | 0.02
Measurement Input, Mortality Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 1.00 | 1.00
Measurement Input, Mortality Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Asset, Measurement Input | 0.00 | 0.00
Measurement Input, Mortality Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.02 | 0.02
Measurement Input, Mortality Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 1.00 | 1.00
Measurement Input, Mortality Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.00 | 0.00
Measurement Input, Mortality Rate [Member] | Embedded Derivatives In Variable Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.02 | 0.01
Measurement Input, Mortality Rate [Member] | Embedded Derivatives In Variable Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 1.00 | 1.00
Measurement Input, Mortality Rate [Member] | Embedded Derivatives In Variable Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Embedded Derivative Liability, Measurement Input | 0.00 | 0.00
Measurement Input, Mortality Rate [Member] | Mortality Swap [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Measurement Input, Mortality Rate [Member] | Mortality Swap [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Measurement Input, Mortality Rate [Member] | Mortality Swap [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 0.00 | 0.00
Measurement Input, EBITDA Multiple [Member] | Corporate Debt Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 6.3 | 6.7
Measurement Input, EBITDA Multiple [Member] | Corporate Debt Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 7.0 | 7.1
Measurement Input, EBITDA Multiple [Member] | Corporate Debt Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Debt Instrument, Measurement Input | 5.2 | 5.2
Measurement Input, EBITDA Multiple [Member] | Equity Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Equity Securities, FV-NI, Measurement Input | 8.0 | 7.8
Measurement Input, EBITDA Multiple [Member] | Equity Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Equity Securities, FV-NI, Measurement Input | 10.6 | 9.3
Measurement Input, EBITDA Multiple [Member] | Equity Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Equity Securities, FV-NI, Measurement Input | 6.9 | 6.9

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