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Investments - Mortgage loans amortized cost by debt service coverage ratio distribution and year of origination (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost, net | $ 823 | $ 762
Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 833 | 769
Allowance | (10) | (7)
Amortized cost, net | 823 | 762
Mortgage loans | 2018 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 146 |
Mortgage loans | 2019 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 237 |
Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 52 |
Mortgage loans | 2021 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 197 |
Mortgage loans | 2022 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 102 |
Mortgage loans | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 99 |
Below 1.0 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 18 | 18
Below 1.0 | Mortgage loans | 2018 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Below 1.0 | Mortgage loans | 2019 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Below 1.0 | Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Below 1.0 | Mortgage loans | 2021 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Below 1.0 | Mortgage loans | 2022 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 18 |
Below 1.0 | Mortgage loans | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
1.0 - 1.25 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 45 | 42
1.0 - 1.25 | Mortgage loans | 2018 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 23 |
1.0 - 1.25 | Mortgage loans | 2019 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
1.0 - 1.25 | Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 10 |
1.0 - 1.25 | Mortgage loans | 2021 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 12 |
1.0 - 1.25 | Mortgage loans | 2022 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
1.0 - 1.25 | Mortgage loans | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
1.26 - 1.50 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 174 | 151
1.26 - 1.50 | Mortgage loans | 2018 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 41 |
1.26 - 1.50 | Mortgage loans | 2019 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 65 |
1.26 - 1.50 | Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
1.26 - 1.50 | Mortgage loans | 2021 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
1.26 - 1.50 | Mortgage loans | 2022 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 20 |
1.26 - 1.50 | Mortgage loans | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 48 |
Above 1.50 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 596 | $ 558
Above 1.50 | Mortgage loans | 2018 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 82 |
Above 1.50 | Mortgage loans | 2019 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 172 |
Above 1.50 | Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 42 |
Above 1.50 | Mortgage loans | 2021 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 185 |
Above 1.50 | Mortgage loans | 2022 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 64 |
Above 1.50 | Mortgage loans | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | $ 51 |

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References No definition available. + Details
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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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