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Investments - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
security
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Investments [Line Items]      
Unfunded commitments to limited partnerships $ 260   $ 290
Investments accounted for using the equity method $ 1,324   $ 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 75.00%    
Percentage (based on fair value) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade 91.00%    
Net investment income $ 188 $ 104  
Realized gains (losses) on securities still owned $ 77 (328)  
Multifamily      
Schedule of Investments [Line Items]      
Percent of real-estate related investments by property type 88.00%   87.00%
Single Family      
Schedule of Investments [Line Items]      
Percent of real-estate related investments by property type 2.00%   2.00%
Other Property      
Schedule of Investments [Line Items]      
Percent of real-estate related investments by property type 10.00%   11.00%
Annuity subsidiaries      
Schedule of Investments [Line Items]      
Net investment income $ 447 415  
Annuity subsidiaries | Assets of discontinued annuity operations      
Schedule of Investments [Line Items]      
Investments accounted for using the equity method 671   $ 646
Neon Capital Limited      
Schedule of Investments [Line Items]      
Net investment income   (6)  
Fixed maturities      
Schedule of Investments [Line Items]      
Gross unrealized losses on fixed maturities $ 16   21
Number of available for sale securities in an unrealized loss position | security 434    
Realized gains (losses) on securities still owned $ 0 (11)  
Available-for-sale Securities, Gross Realized Gains 2 3  
Available-for-sale Securities, Gross Realized Losses (1) (1)  
Fixed maturities | Annuity subsidiaries      
Schedule of Investments [Line Items]      
Available-for-sale Securities, Gross Realized Gains 18 26  
Available-for-sale Securities, Gross Realized Losses (2) (3)  
Fixed maturities | Annuity subsidiaries | Assets of discontinued annuity operations      
Schedule of Investments [Line Items]      
Gross unrealized losses on fixed maturities $ 104   $ 97
Accounting Standards Update 2016-01 | Equity securities | Neon Capital Limited      
Schedule of Investments [Line Items]      
Net investment income   $ (7)