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Reserve for Life-Contingent Contract Benefits and Contractholder Funds - Key assumptions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Key contract provisions relating to contractholder funds:        
Total contractholder funds $ 17,692 $ 18,371 $ 19,434 $ 20,260
Interest-sensitive life insurance contract charges        
Key contract provisions relating to contractholder funds:        
Period for withdrawal or surrender charges 20 years      
Total contractholder funds $ 8,384 8,229    
Equity-indexed life insurance | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 0.00%      
Equity-indexed life insurance | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 10.00%      
Other life insurance | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 1.00%      
Other life insurance | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 6.00%      
Fixed annuities contract charges        
Key contract provisions relating to contractholder funds:        
Percent of fixed annuities subject to market value adjustment for discretionary withdrawals 12.00%      
Total contractholder funds $ 8,845 9,681    
Immediate Fixed Annuities | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 0.50%      
Immediate Fixed Annuities | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 7.50%      
Equity-indexed fixed annuities | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) (8.00%)      
Equity-indexed fixed annuities | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 10.00%      
Other fixed annuities | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 0.10%      
Other fixed annuities | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 6.00%      
Other investment contracts        
Key contract provisions relating to contractholder funds:        
Total contractholder funds $ 463 $ 461    
Other investment contracts | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 1.70%      
Other investment contracts | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 10.30%