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Future Policy Benefits -Liability For Future Policy Benefit Expected Future Policy Benefit Undiscounted (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Mar. 31, 2022
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Liability For Future Policy Benefit, Expected Future Policy Benefit, Discounted [Abstract] |  |
Expected future benefit payments |  | $ 2,734
Expected future gross premiums |  | 1,129
Traditional Life |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted [Abstract] |  |
Expected future benefit payments | $ 3,073 | 3,265
Expected future gross premiums | 1,142 | 1,289
Liability For Future Policy Benefit, Expected Future Policy Benefit, Discounted [Abstract] |  |
Expected future benefit payments | 2,155 |
Expected future gross premiums | 839 |
Immediate Annuities |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted [Abstract] |  |
Expected future benefit payments | 3,402 | 3,545
Expected future gross premiums | 0 | 0
Liability For Future Policy Benefit, Expected Future Policy Benefit, Discounted [Abstract] |  |
Expected future benefit payments | 1,452 | 1,923
Expected future gross premiums | 0 | 0
PRT |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted [Abstract] |  |
Expected future benefit payments | 3,916 | 2,289
Expected future gross premiums | 0 | 0
Liability For Future Policy Benefit, Expected Future Policy Benefit, Discounted [Abstract] |  |
Expected future benefit payments | 2,708 | 1,665
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 Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439 + Details
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