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Investments - Mortgage Loans Credit Ratings Indicator (Details) - Commercial Real Estate - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 1,047 | $ 1,213
2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 46 |
2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 96 | 93
2018 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 94 | 93
2017 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 150 | 221
2016 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 101 | 140
Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 560 | 666
1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 59 | 58
1 | 2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
1 | 2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
1 | 2018 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
1 | 2017 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 22 | 15
1 | 2016 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
1 | Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 37 | 43
2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 952 | 1,143
2 to 4 | 2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 46 |
2 to 4 | 2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 96 | 93
2 to 4 | 2018 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 91 | 93
2 to 4 | 2017 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 124 | 206
2 to 4 | 2016 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 101 | 140
2 to 4 | Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 494 | 611
5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 36 | 12
5 and 6 | 2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
5 and 6 | 2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
5 and 6 | 2018 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 3 | 0
5 and 6 | 2017 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 4 | 0
5 and 6 | 2016 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
5 and 6 | Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 29 | 12
7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
7 | 2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
7 | 2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
7 | 2018 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
7 | 2017 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
7 | 2016 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
7 | Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 0 | $ 0

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