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Reserve for Life-Contingent Contract Benefits and Contractholder Funds - Assumptions generally used in calculating the reserve for life-contingent (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Contractholder funds        
Total contractholder funds $ 16,481 $ 16,711 $ 17,470 $ 18,592
Interest-sensitive life insurance        
Contractholder funds        
Total contractholder funds 7,794 7,442    
Fixed annuities        
Contractholder funds        
Total contractholder funds $ 8,163 8,811    
Key contract provisions relating to contractholder funds:        
Percent of fixed annuities subject to market value adjustment for discretionary withdrawals (as a percent) 11.00%      
Other investment contracts        
Contractholder funds        
Total contractholder funds $ 524 $ 458    
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%      
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%      
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) 9.00%      
Equity indexed fixed annuities        
Key contract provisions relating to contractholder funds:        
Period for withdrawal or surrender charges (in years) 20 years      
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) 9.00%      
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%      
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) 5.00%