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Investments - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Investments [Line Items]          
Unfunded commitments to limited partnerships $ 302   $ 302   $ 290
Investments accounted for using the equity method 1,407   $ 1,407   $ 1,235
Percentage (based on amount of unrealized loss) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade     74.00%    
Percentage (based on fair value) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade     94.00%    
Net investment income $ 169 $ 122 $ 521 $ 314  
Multifamily          
Schedule of Investments [Line Items]          
Percent of real-estate related investments by property type 88.00%   88.00%   87.00%
Single Family          
Schedule of Investments [Line Items]          
Percent of real-estate related investments by property type 2.00%   2.00%   2.00%
Other Property          
Schedule of Investments [Line Items]          
Percent of real-estate related investments by property type 10.00%   10.00%   11.00%
Annuity subsidiaries | Assets of discontinued annuity operations          
Schedule of Investments [Line Items]          
Investments accounted for using the equity method         $ 646
Neon Capital Limited          
Schedule of Investments [Line Items]          
Net investment income   $ 1   (5)  
Neon Capital Limited | Investment income          
Schedule of Investments [Line Items]          
Loss on sale of equity securities       $ (7)  
Fixed maturities          
Schedule of Investments [Line Items]          
Gross unrealized losses on fixed maturities $ 14   $ 14   21
Number of available for sale securities in an unrealized loss position | security     394    
Fixed maturities | Annuity subsidiaries | Assets of discontinued annuity operations          
Schedule of Investments [Line Items]          
Gross unrealized losses on fixed maturities         $ 97