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Investments - Credit Quality of RMLs (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Jun. 01, 2020
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Allowance for expected loan loss | $ (33) | $ (34) | $ (39) | $ (35) | $ (27) | $ 0
Total mortgage loans | 3,484 |  | 2,031 |  |  |
Residential mortgage loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Carrying Value | 1,527 |  | 1,165 |  |  |
Allowance for expected loan loss | (27) | $ (28) | (37) | $ (33) | $ (26) | $ 0
Total mortgage loans | $ 1,500 |  | $ 1,128 |  |  |
Allowance % of Total | 0.00% |  | 0.00% |  |  |
% of Total | 100.00% |  | 100.00% |  |  |
Residential mortgage loans | Performing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Carrying Value | $ 1,429 |  | $ 1,059 |  |  |
% of Total | 94.00% |  | 91.00% |  |  |
Residential mortgage loans | Non-performing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Carrying Value | $ 98 |  | $ 106 |  |  |
% of Total | 6.00% |  | 9.00% |  |  |

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