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Investments - Credit Quality of RMLs (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Allowance for expected loan loss | $ (32) | $ (31) | $ (36) | $ (39)
Total mortgage loans | 4,217 | 3,749 |  |
Residential mortgage loans |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Gross Carrying Value | $ 2,012 | $ 1,606 |  |
% of Total | 100.00% | 100.00% |  |
Allowance for expected loan loss | $ (26) | $ (25) | $ (31) | $ (37)
Allowance for expected loan loss, percent | 0.00% | 0.00% |  |
Total mortgage loans | $ 1,986 | $ 1,581 |  |
Allowance % of Total | 100.00% | 100.00% |  |
Residential mortgage loans | Performing |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Gross Carrying Value | $ 1,947 | $ 1,533 |  |
% of Total | 97.00% | 95.00% |  |
Residential mortgage loans | Non-performing |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Gross Carrying Value | $ 65 | $ 73 |  |
% of Total | 3.00% | 5.00% |  |

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