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Investments - Mortgage Loans Credit Ratings Indicator (Details) - Commercial Real Estate - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 934 | $ 1,047
Category 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 51 | 59
Category 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 870 | 952
Categories 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 13 | 36
Category 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2021 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 171 |
2021 | Category 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
2021 | Category 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 171 |
2021 | Categories 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
2021 | Category 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 44 | 46
2020 | Category 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2020 | Category 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 44 | 46
2020 | Categories 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2020 | Category 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 64 | 96
2019 | Category 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2019 | Category 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 64 | 96
2019 | Categories 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2019 | Category 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2018 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 76 | 94
2018 | Category 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2018 | Category 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 73 | 91
2018 | Categories 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 3 | 3
2018 | Category 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2017 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 101 | 150
2017 | Category 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 22 | 22
2017 | Category 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 75 | 124
2017 | Categories 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 4 | 4
2017 | Category 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 478 | 661
Prior | Category 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 29 | 37
Prior | Category 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 443 | 595
Prior | Categories 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 6 | 29
Prior | Category 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 0 | $ 0

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