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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 | Dec. 31, 2017 | Dec. 31, 2016
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Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | $ 121,110 | $ 109,182
Percent of total variable annuity separate account values | 99.00% | 99.00%
Domestic Equity [Member] |  |
Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | $ 59,647 | $ 52,244
International Equity [Member] |  |
Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | 20,837 | 17,396
Fixed Income [Member] |  |
Account Balances Of Variable Annuity Contracts With Guarantees Invested In Separate Accounts [Line Items] |  |
Total | $ 40,626 | $ 39,542

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph ((d)(1)) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 + Details
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