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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, 2021 | Dec. 31, 2020
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Mortgage loans, net | $ 752 | $ 746
Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 759 | 754
Allowance | (7) | (8)
Mortgage loans, net | 752 | 746
Mortgage loans | 2016 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 120 |
Mortgage loans | 2017 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 45 |
Mortgage loans | 2018 |  |
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 | 279 |
Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 77 |
Mortgage loans | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 92 |
Below 1.0 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 | 0
Below 1.0 | Mortgage loans | 2016 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Below 1.0 | Mortgage loans | 2017 |  |
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 | 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 | 46 | 46
1.0 - 1.25 | Mortgage loans | 2016 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 11 |
1.0 - 1.25 | Mortgage loans | 2017 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
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 | 25 |
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 | 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 | 153 | 201
1.26 - 1.50 | Mortgage loans | 2016 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 43 |
1.26 - 1.50 | Mortgage loans | 2017 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 5 |
1.26 - 1.50 | Mortgage loans | 2018 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
1.26 - 1.50 | Mortgage loans | 2019 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 105 |
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 | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 0 |
Above 1.50 | Mortgage loans |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 560 | $ 507
Above 1.50 | Mortgage loans | 2016 and prior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 66 |
Above 1.50 | Mortgage loans | 2017 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 40 |
Above 1.50 | Mortgage loans | 2018 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 146 |
Above 1.50 | Mortgage loans | 2019 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 149 |
Above 1.50 | Mortgage loans | 2020 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | 67 |
Above 1.50 | Mortgage loans | Current |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost before allowance | $ 92 |

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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 http://asc.fasb.org/extlink&oid=123605502&loc=d3e21338-158488 + Details
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- Definition Amount excluding accrued interest, before allowance for credit loss, of financing receivable. + 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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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