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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 | Jun. 30, 2023 | Jun. 30, 2022
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Accident and health insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums, undiscounted | $ 5,020 | $ 5,133
Expected future gross premiums, discounted | 3,602 | 3,833
Expected future benefits and expenses, undiscounted | 3,350 | 3,416
Expected future benefits and expenses, discounted | 2,326 | 2,433
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums, undiscounted | 696 | 636
Expected future gross premiums, discounted | 489 | 457
Expected future benefits and expenses, undiscounted | 1,008 | 956
Expected future benefits and expenses, discounted | $ 539 | $ 561

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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 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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