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Fair Value of Assets and Liabilities - Carrying values and fair value estimates of financial instruments not carried at fair value (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Financial assets        
Mortgage loans, net $ 902 $ 746    
Assets held for sale 36,829 42,131    
Financial liabilities        
Long-term debt 7,996 7,825    
Liability for collateral 1,096 914 $ 928 $ 1,298
Liabilities held for sale 33,383 33,325    
Significant unobservable inputs (Level 3) | Amortized cost, net        
Financial assets        
Mortgage loans, net 902 746    
Bank loans 1,260 772    
Agent loans 607 0    
Assets held for sale 3,278 4,206    
Financial liabilities        
Contractholder funds on investment contracts 33 0    
Liabilities held for sale 8,099 8,130    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans, net 948 792    
Bank loans 1,286 803    
Agent loans 606 0    
Assets held for sale 3,484 4,440    
Financial liabilities        
Contractholder funds on investment contracts 35 0    
Liabilities held for sale 8,950 9,424    
Significant other observable inputs (Level 2) | Amortized cost, net        
Financial liabilities        
Long-term debt 7,577 7,825    
Liability for collateral 1,096 914    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Long-term debt 9,046 9,489    
Liability for collateral $ 1,096 $ 914