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Investments - Credit Quality of RMLs (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Allowance for credit loss | $ 34 | $ 39
Total mortgage loans | 2,794 | 2,031
Residential mortgage loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Allowance for credit loss | 28 | 37
Total mortgage loans | $ 1,209 | $ 1,128
% of Total | 100.00% | 100.00%
Unpaid Principal Balance | $ 1,237 | $ 1,165
Allowance % of Total | 0.00% | 0.00%
Residential mortgage loans | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
% of Total | 92.00% | 91.00%
Unpaid Principal Balance | $ 1,144 | $ 1,059
Residential mortgage loans | Non-performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
% of Total | 8.00% | 9.00%
Unpaid Principal Balance | $ 93 | $ 106

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