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Reserve for Future Policy Benefits and Contractholder Funds - Schedule of undiscounted and discounted expected gross premiums and expected future benefits and expenses (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Mar. 31, 2022
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Accident and health insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums, undiscounted | $ 5,068 | $ 5,219
Expected future gross premiums, discounted | 3,671 | 4,137
Expected future benefits and expenses, undiscounted | 3,351 | 3,453
Expected future benefits and expenses, discounted | 2,335 | 2,629
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums, undiscounted | 721 | 652
Expected future gross premiums, discounted | 500 | 500
Expected future benefits and expenses, undiscounted | 1,008 | 972
Expected future benefits and expenses, discounted | $ 547 | $ 625

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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 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 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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- 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29E -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819541-158441 Reference 2: 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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- 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 -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 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29E -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819541-158441 + Details
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