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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 | Sep. 30, 2021 | Dec. 31, 2020
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Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | $ 139,171 | $ 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 | $ 73,503 | $ 70,362
International Equity [Member] |  |
Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | 21,041 | 20,855
Fixed Income [Member] |  |
Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | $ 44,627 | $ 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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- Definition Value of the separate accounts corresponding to the specified product, guarantee type and subset of the guarantee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph ((d)(1)) -URI http://asc.fasb.org/extlink&oid=124508989&loc=d3e19393-158473 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=124504833&loc=d3e7104-158389 + Details
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