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Contractholder Funds - Account Values by Range of Guaranteed Minimum Credit Rating (Details) $ in Millions | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | $ 50,875 | $ 48,798 |
Indexed Annuity |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 27,862 | 27,164 | $ 24,766
Indexed Annuity | At Guaranteed Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 23,355 | 22,965 |
Indexed Annuity | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 1,393 | 1,446 |
Indexed Annuity | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 615 | 550 |
Indexed Annuity | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 2,499 | 2,203 |
Indexed Annuity | 0.00% To 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 26,515 | 26,315 |
Indexed Annuity | 0.00% To 1.50% | At Guaranteed Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 22,671 | 22,392 |
Indexed Annuity | 0.00% To 1.50% | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 1,391 | 1,444 |
Indexed Annuity | 0.00% To 1.50% | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 522 | 526 |
Indexed Annuity | 0.00% To 1.50% | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 1,931 | 1,953 |
Indexed Annuity | 1.51% To 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 993 | 471 |
Indexed Annuity | 1.51% To 2.50% | At Guaranteed Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 331 | 196 |
Indexed Annuity | 1.51% To 2.50% | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 1 | 1 |
Indexed Annuity | 1.51% To 2.50% | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 93 | 24 |
Indexed Annuity | 1.51% To 2.50% | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 568 | 250 |
Indexed Annuity | Greater Than 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 354 | 378 |
Indexed Annuity | Greater Than 2.50% | At Guaranteed Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 353 | 377 |
Indexed Annuity | Greater Than 2.50% | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 1 | 1 |
Indexed Annuity | Greater Than 2.50% | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 0 | 0 |
Indexed Annuity | Greater Than 2.50% | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 0 | 0 |
Fixed Rate Annuities |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 14,486 | 13,443 | 9,358
Fixed Rate Annuities | At Guaranteed Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 910 | 921 |
Fixed Rate Annuities | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 33 | 35 |
Fixed Rate Annuities | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 1,365 | 1,559 |
Fixed Rate Annuities | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 12,178 | 10,928 |
Fixed Rate Annuities | 0.00% To 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 12,659 | 11,851 |
Fixed Rate Annuities | 0.00% To 1.50% | At Guaranteed Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 36 | 23 |
Fixed Rate Annuities | 0.00% To 1.50% | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 24 | 25 |
Fixed Rate Annuities | 0.00% To 1.50% | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 1,340 | 1,532 |
Fixed Rate Annuities | 0.00% To 1.50% | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 11,259 | 10,271 |
Fixed Rate Annuities | 1.51% To 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 488 | 489 |
Fixed Rate Annuities | 1.51% To 2.50% | At Guaranteed Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 4 | 5 |
Fixed Rate Annuities | 1.51% To 2.50% | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 7 | 8 |
Fixed Rate Annuities | 1.51% To 2.50% | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 21 | 23 |
Fixed Rate Annuities | 1.51% To 2.50% | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 456 | 453 |
Fixed Rate Annuities | Greater Than 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 1,339 | 1,103 |
Fixed Rate Annuities | Greater Than 2.50% | At Guaranteed Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 870 | 893 |
Fixed Rate Annuities | Greater Than 2.50% | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 2 | 2 |
Fixed Rate Annuities | Greater Than 2.50% | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 4 | 4 |
Fixed Rate Annuities | Greater Than 2.50% | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 463 | 204 |
Universal Life |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 2,488 | 2,391 | $ 2,112
Universal Life | At Guaranteed Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 2,454 | 2,348 |
Universal Life | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 11 | 21 |
Universal Life | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 1 | 1 |
Universal Life | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 22 | 21 |
Universal Life | 0.00% To 1.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 2,113 | 2,013 |
Universal Life | 0.00% To 1.50% | At Guaranteed Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 2,085 | 1,987 |
Universal Life | 0.00% To 1.50% | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 6 | 5 |
Universal Life | 0.00% To 1.50% | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 0 | 0 |
Universal Life | 0.00% To 1.50% | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 22 | 21 |
Universal Life | 1.51% To 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 0 | 0 |
Universal Life | 1.51% To 2.50% | At Guaranteed Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 0 | 0 |
Universal Life | 1.51% To 2.50% | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 0 | 0 |
Universal Life | 1.51% To 2.50% | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 0 | 0 |
Universal Life | 1.51% To 2.50% | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 0 | 0 |
Universal Life | Greater Than 2.50% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 375 | 378 |
Universal Life | Greater Than 2.50% | At Guaranteed Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 369 | 361 |
Universal Life | Greater Than 2.50% | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 5 | 16 |
Universal Life | Greater Than 2.50% | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | 1 | 1 |
Universal Life | Greater Than 2.50% | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Contractholder funds | $ 0 | $ 0 |
Minimum | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0001 | 0.0001 |
Minimum | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0051 | 0.0051 |
Minimum | Greater Than 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0150 | 0.0150 |
Maximum | Range from 0001 to 0050 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0050 | 0.0050 |
Maximum | Range from 0051 to 0150 |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0150 |  |

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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 Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7A + Details
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- Definition Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7A Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(14)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7A + Details
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