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Guaranteed Benefit Features (Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts) (Details) - Variable Annuity [Member] - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | $ 142,051 | $ 134,738
Percent of total variable annuity separate account values | 98.00% | 98.00%
Domestic Equity [Member] |  |
Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | $ 75,188 | $ 70,362
International Equity [Member] |  |
Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | 21,660 | 20,855
Fixed Income [Member] |  |
Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | $ 45,203 | $ 43,521

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- Definition Separate account values of variable annuity contracts with guarantees as a percentage of total variable annuity separate account values + References No definition available. + Details
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