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Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Account Values by Comparison of Current Crediting Rate to Guaranteed Minimum Crediting Rate (Details) $ in Millions | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($)
--- | --- | ---
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | $ 890 | $ 878
Less than 3.00% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | $ 0 | $ 0
Less than 3.00% | Maximum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance above guaranteed minimum crediting rate | 0.0300 | 0.0300
3.00% - 3.49% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | $ 34 | $ 20
3.00% - 3.49% | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance above guaranteed minimum crediting rate | 0.0300 | 0.0300
3.00% - 3.49% | Maximum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance above guaranteed minimum crediting rate | 0.0349 | 0.0349
3.50% - 3.99% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | $ 10 | $ 11
3.50% - 3.99% | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance above guaranteed minimum crediting rate | 0.0350 | 0.0350
3.50% - 3.99% | Maximum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance above guaranteed minimum crediting rate | 0.0399 | 0.0399
4.00% - 4.49% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | $ 437 | $ 431
4.00% - 4.49% | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance above guaranteed minimum crediting rate | 0.0400 | 0.0400
4.00% - 4.49% | Maximum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance above guaranteed minimum crediting rate | 0.0449 | 0.0449
4.50% - 4.99% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | $ 260 | $ 266
4.50% - 4.99% | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance above guaranteed minimum crediting rate | 0.0450 | 0.0450
4.50% - 4.99% | Maximum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance above guaranteed minimum crediting rate | 0.0499 | 0.0499
5.00% or greater |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | $ 67 | $ 69
5.00% or greater | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance above guaranteed minimum crediting rate | 0.0500 | 0.0500
Non-account balances |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | $ 82 | $ 81
At guaranteed minimum |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | 774 | 777
At guaranteed minimum | Less than 3.00% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | 0 | 0
At guaranteed minimum | 3.00% - 3.49% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | 0 | 0
At guaranteed minimum | 3.50% - 3.99% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | 10 | 11
At guaranteed minimum | 4.00% - 4.49% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | 437 | 431
At guaranteed minimum | 4.50% - 4.99% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | 260 | 266
At guaranteed minimum | 5.00% or greater |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | 67 | 69
At guaranteed minimum | Non-account balances |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates |  |
1-50 basis points above |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | $ 34 | 20
1-50 basis points above | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance above guaranteed minimum crediting rate | 0.0001 |
1-50 basis points above | Maximum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance above guaranteed minimum crediting rate | 0.0050 |
1-50 basis points above | Less than 3.00% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | $ 0 | 0
1-50 basis points above | 3.00% - 3.49% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | 34 | 20
1-50 basis points above | 3.50% - 3.99% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | 0 | 0
1-50 basis points above | 4.00% - 4.49% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | 0 | 0
1-50 basis points above | 4.50% - 4.99% |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | 0 | 0
1-50 basis points above | 5.00% or greater |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates | 0 | 0
1-50 basis points above | Non-account balances |  |
Policyholder Account Balance [Line Items] |  |
Account values with crediting rates |  |

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- Definition Value above guaranteed minimum crediting rate on policyholder account balance. + 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 (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7A + 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 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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