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Guaranteed Benefit Features (Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | $ 143,744 | $ 134,738
Domestic Equity [Member] |  |
Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | 77,290 | 70,362
International Equity [Member] |  |
Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | 21,223 | 20,855
Fixed Income [Member] |  |
Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | $ 45,231 | $ 43,521

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