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Investments - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Investments [Line Items]        
Unfunded commitments to limited partnerships   $ 366 $ 290  
Investments accounted for using the equity method   $ 1,517 1,235  
Percentage (based on unrealized loss) of available for sale fixed maturities that are in unrealized loss position and rated investment grade   84.00%    
Percentage (based on fair value) of available for sale fixed maturities that are in unrealized loss position and rated investment grade   95.00%    
Net investment income   $ 730 461 $ 532
Assets of discontinued annuity operations | Annuity subsidiaries        
Schedule of Investments [Line Items]        
Investments accounted for using the equity method     $ 646  
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   1.00% 2.00%  
Other Property        
Schedule of Investments [Line Items]        
Percent of real estate-related investments by property type   11.00% 11.00%  
Neon Capital Limited        
Schedule of Investments [Line Items]        
Net investment income     $ (5)  
Neon Capital Limited | Accounting Standards Update 2016-01 | Equity securities        
Schedule of Investments [Line Items]        
Net investment income $ (7)      
Fixed maturities        
Schedule of Investments [Line Items]        
Gross unrealized losses on available for sale fixed maturities   $ (28) (21)  
Number of fixed maturities in an unrealized loss position | security   514,000,000    
Fixed maturities | Assets of discontinued annuity operations | Annuity subsidiaries        
Schedule of Investments [Line Items]        
Gross unrealized losses on available for sale fixed maturities     $ (97)