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Investments - Recorded Investment in CMLs by LTV and DSC Ratio Categories (Details) - Commercial mortgage loans - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 2,237 $ 2,174
% of Total 100.00% 100.00%
Fair Value    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 2,147 $ 2,265
% of Total 100.00% 100.00%
Greater than 1.25    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 2,198 $ 2,132
1.00 - 1.25    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value 30 33
Greater than 1.00    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value 9 9
LTV Less Than 50 %    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 638 $ 668
% of Total 29.00% 31.00%
LTV Less Than 50 % | Fair Value    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 631 $ 745
% of Total 29.00% 33.00%
LTV Less Than 50 % | Greater than 1.25    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 608 $ 626
LTV Less Than 50 % | 1.00 - 1.25    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value 21 33
LTV Less Than 50 % | Greater than 1.00    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value 9 9
LTV 50 to 60%    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 512 $ 470
% of Total 23.00% 22.00%
LTV 50 to 60% | Fair Value    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 494 $ 481
% of Total 23.00% 21.00%
LTV 50 to 60% | Greater than 1.25    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 512 $ 470
LTV 50 to 60% | 1.00 - 1.25    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value 0 0
LTV 50 to 60% | Greater than 1.00    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value 0 0
LTV 60% to 75%    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 1,078 $ 1,036
% of Total 48.00% 47.00%
LTV 60% to 75% | Fair Value    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 1,016 $ 1,039
% of Total 47.00% 46.00%
LTV 60% to 75% | Greater than 1.25    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 1,078 $ 1,036
LTV 60% to 75% | 1.00 - 1.25    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value 0 0
LTV 60% to 75% | Greater than 1.00    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value 0 $ 0
LTV 75% to 85%    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 9  
% of Total 1.00%  
LTV 75% to 85% | Fair Value    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 6  
% of Total 1.00%  
LTV 75% to 85% | Greater than 1.25    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 0  
LTV 75% to 85% | 1.00 - 1.25    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value 9  
LTV 75% to 85% | Greater than 1.00    
Debt Securities, Available-for-sale [Line Items]    
Gross Carrying Value $ 0