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Investments - Recorded Investment in CMLs by LTV and DSC Ratio Categories (Details) - Commercial mortgage loans - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 1,990 | $ 905
% of Total | 100.00% | 100.00%
Fair Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 2,010 | $ 927
% of Total | 100.00% | 100.00%
Greater than 1.25 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 1,791 | $ 878
1.00 - 1.25 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | 33 | 27
Greater than 1.00 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | 166 | 0
LTV Less Than 50 % |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 640 | $ 538
% of Total | 32.00% | 60.00%
LTV Less Than 50 % | Fair Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 661 | $ 557
% of Total | 33.00% | 60.00%
LTV Less Than 50 % | Greater than 1.25 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 441 | $ 520
LTV Less Than 50 % | 1.00 - 1.25 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | 33 | 18
LTV Less Than 50 % | Greater than 1.00 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | 166 | 0
LTV 50 to 60% |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 386 | $ 246
% of Total | 19.00% | 27.00%
LTV 50 to 60% | Fair Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 394 | $ 251
% of Total | 20.00% | 27.00%
LTV 50 to 60% | Greater than 1.25 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 386 | $ 237
LTV 50 to 60% | 1.00 - 1.25 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | 0 | 9
LTV 50 to 60% | Greater than 1.00 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | 0 | 0
LTV 60% to 75% |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 964 | $ 121
% of Total | 49.00% | 13.00%
LTV 60% to 75% | Fair Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 955 | $ 119
% of Total | 47.00% | 13.00%
LTV 60% to 75% | Greater than 1.25 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 964 | $ 121
LTV 60% to 75% | 1.00 - 1.25 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | 0 | 0
LTV 60% to 75% | Greater than 1.00 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unpaid Principal Balance | $ 0 | $ 0

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