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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
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Financial assets        
Mortgage loans, net $ 752 $ 746    
Assets held for sale 36,803 42,131    
Financial liabilities        
Long-term debt 7,980 7,825    
Liability for collateral 1,481 914 $ 1,093 $ 1,298
Liabilities held for sale 32,421 33,325    
Significant unobservable inputs (Level 3) | Amortized cost, net        
Financial assets        
Mortgage loans, net 752 746    
Bank loans 1,592 772    
Agent loans 567 0    
Assets held for sale 2,852 4,206    
Financial liabilities        
Contractholder funds on investment contracts 20 0    
Liabilities held for sale 7,316 8,130    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans, net 795 792    
Bank loans 1,640 803    
Agent loans 570 0    
Assets held for sale 3,050 4,440    
Financial liabilities        
Contractholder funds on investment contracts 20 0    
Liabilities held for sale 8,248 9,424    
Significant other observable inputs (Level 2) | Amortized cost, net        
Financial liabilities        
Long-term debt 7,980 7,825    
Liability for collateral 1,481 914    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Long-term debt 9,267 9,489    
Liability for collateral $ 1,481 $ 914