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Guaranteed Benefit Features (Information On Guaranteed Death Benefit Features) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Return of Net Deposits [Member] |  |
Net Amount at Risk by Product and Guarantee [Line Items] |  |
Total account value | $ 88,627 | $ 101,601
Net amount at risk | $ 1,563 | $ 71
Average attained age of contract holders | 65 years | 65 years
Minimum Return [Member] |  |
Net Amount at Risk by Product and Guarantee [Line Items] |  |
Total account value | $ 76 | $ 92
Net amount at risk | $ 17 | $ 13
Average attained age of contract holders | 78 years | 77 years
Guaranteed minimum return | 5.00% | 5.00%
Anniversary Contract Value [Member] |  |
Net Amount at Risk by Product and Guarantee [Line Items] |  |
Total account value | $ 21,713 | $ 25,763
Net amount at risk | $ 2,401 | $ 384
Average attained age of contract holders | 72 years | 71 years

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- Definition Describes the guaranteed minimum return rates, in percentages. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Net amount at risk, representing the guaranteed benefit in excess of the current account balance 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)(3),(5) -URI http://asc.fasb.org/extlink&oid=117420044&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=117418410&loc=d3e7104-158389 + 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=117420044&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=117418410&loc=d3e7104-158389 + Details
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- Definition Weighted average attained age of policyholders or contract holders in the specified guarantee type and subset of guarantee class, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(5)) -URI http://asc.fasb.org/extlink&oid=117420044&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=117418410&loc=d3e7104-158389 + Details
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