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Investments - Mortgage loans amortized cost by debt service coverage ratio distribution and year of origination (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost, net | $ 833 | $ 821
Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 839 | 827
Allowance | (6) | (6)
Amortized cost, net | 833 | 821
Mortgage loans | 2017 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 125 |
Mortgage loans | 2018 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 106 |
Mortgage loans | 2019 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 239 |
Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 51 |
Mortgage loans | 2021 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 217 |
Mortgage loans | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 101 |
Below 1.0 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 18 | 0
Below 1.0 | Mortgage loans | 2017 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Below 1.0 | Mortgage loans | 2018 |  |
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 | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 18 |
1.0 - 1.25 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 67 | 46
1.0 - 1.25 | Mortgage loans | 2017 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 35 |
1.0 - 1.25 | Mortgage loans | 2018 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
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 | 0 |
1.0 - 1.25 | Mortgage loans | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 22 |
1.26 - 1.50 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 128 | 160
1.26 - 1.50 | Mortgage loans | 2017 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 13 |
1.26 - 1.50 | Mortgage loans | 2018 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 5 |
1.26 - 1.50 | Mortgage loans | 2019 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 103 |
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 | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 7 |
Above 1.50 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 626 | $ 621
Above 1.50 | Mortgage loans | 2017 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 77 |
Above 1.50 | Mortgage loans | 2018 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 101 |
Above 1.50 | Mortgage loans | 2019 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 136 |
Above 1.50 | Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 41 |
Above 1.50 | Mortgage loans | 2021 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 217 |
Above 1.50 | Mortgage loans | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | $ 54 |

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=123605502&loc=d3e21338-158488 + 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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