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Future Policy Benefits - Schedule of Liability For Future Policy Benefit Expected Future Policy Benefit Undiscounted (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Traditional Life |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted [Abstract] |  |
Expected future benefit payments | $ 2,843 | $ 2,996
Expected future gross premiums | 978 | 1,116
Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted [Abstract] |  |
Expected future benefit payments | 2,073 | 1,984
Expected future gross premiums | 728 | 772
Immediate Annuities |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted [Abstract] |  |
Expected future benefit payments | 3,212 | 3,227
Expected future gross premiums | 0 | 0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted [Abstract] |  |
Expected future benefit payments | 1,392 | 1,313
Expected future gross premiums | 0 | 0
PRT |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted [Abstract] |  |
Expected future benefit payments | 8,449 | 5,445
Expected future gross premiums | 0 | 0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted [Abstract] |  |
Expected future benefit payments | 5,470 | 3,605
Expected future gross premiums | $ 0 | $ 0

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- Definition Liability For Future Policy Benefit, Expected Future Policy Benefit, Discounted + References No definition available. + Details
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- Definition Liability For Future Policy Benefit, Expected Future Policy Benefit, Discounted, Before Reinsurance + References No definition available. + Details
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- Definition Amount, before effect of reinsurance, of discounted balance for expected future gross premium component of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 + Details
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- Definition Amount, before effect of reinsurance, of undiscounted balance for expected future gross premium component of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E + Details
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- Definition Amount, before effect of reinsurance, of undiscounted balance for expected future policy benefit and expense component of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E + Details
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