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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 ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Contractholder funds        
Total contractholder funds $ 16,711,000,000 $ 17,470,000,000 $ 18,592,000,000 $ 19,470,000,000
Key contract provisions relating to contractholder funds:        
Reserve for life-contingent contract benefits with respect to deficiency 126,000,000 0    
Interest-sensitive life insurance        
Contractholder funds        
Total contractholder funds $ 7,442,000,000 7,369,000,000    
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        
Contractholder funds        
Total contractholder funds $ 8,811,000,000 9,645,000,000    
Key contract provisions relating to contractholder funds:        
Percent of fixed annuities subject to market value adjustment for discretionary withdrawals 12.00%      
Fixed annuities | Maximum        
Key contract provisions relating to contractholder funds:        
Period for withdrawal or surrender charges 10 years      
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        
Key contract provisions relating to contractholder funds:        
Period for withdrawal or surrender charges 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) 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        
Contractholder funds        
Total contractholder funds $ 458,000,000 $ 456,000,000    
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%