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Reserve for Life-Contingent Contract Benefits and Contractholder Funds - Key assumptions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Key contract provisions relating to contractholder funds:        
Total contractholder funds $ 18,371 $ 19,434 $ 20,260 $ 21,295
Interest-sensitive life insurance contract charges        
Key contract provisions relating to contractholder funds:        
Period for withdrawal or surrender charges 20 years      
Total contractholder funds $ 8,229 8,190    
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) 10.50%      
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 13.50%      
Total contractholder funds $ 9,681 10,828    
Immediate Fixed Annuities | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 0.00%      
Immediate Fixed Annuities | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 9.80%      
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) 10.80%      
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 $ 461 $ 416    
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%