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Investments - Mortgage Loans Credit Ratings Indicator (Details) - Commercial Real Estate - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 918 | $ 902
1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 26 | 28
2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 879 | 861
5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 13 | 13
7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2022 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 58 |
2022 | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
2022 | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 58 |
2022 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
2022 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
2021 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 255 | 255
2021 | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2021 | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 255 | 255
2021 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2021 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 48 | 48
2020 | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2020 | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 48 | 48
2020 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2020 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 25 | 40
2019 | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2019 | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 25 | 40
2019 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2019 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2018 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 69 | 75
2018 | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2018 | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 66 | 72
2018 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 3 | 3
2018 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 463 | 484
Prior | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 26 | 28
Prior | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 427 | 446
Prior | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 10 | 10
Prior | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 0 | $ 0

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- Definition Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column G)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
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