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Reserve for Life-Contingent Contract Benefits and Contractholder Funds (Details 2) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Contractholder funds        
Total contractholder funds $ 21,295 $ 22,529 $ 24,304 $ 39,319
Interest-sensitive life insurance        
Contractholder funds        
Total contractholder funds $ 7,975 7,880    
Key contract provisions relating to contractholder funds:        
Period for withdrawal or surrender charges 20 years      
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        
Contractholder funds        
Total contractholder funds $ 12,974 14,310    
Key contract provisions relating to contractholder funds:        
Percent of fixed annuities subject to market value adjustment for discretionary withdrawals 19.20%      
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) 0.00%      
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) 13.50%      
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) 6.00%      
Funding agreements backing medium-term notes        
Contractholder funds        
Total contractholder funds $ 85 85    
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 0.00%      
Other investment contracts        
Contractholder funds        
Total contractholder funds $ 261 $ 254    
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%