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Insurance (Insurance Liabilities Assumptions and Ratios - Narrative) (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Liability for Future Policy Benefits and Policyholder Account Balances [Abstract]      
Participating business as a percentage of gross life insurance policies in-force 4.00% 5.00%  
Participating business as a percentage of the gross life insurance premiums 19.00% 18.00% 19.00%
Domestic Business | Minimum      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Interest rate assumptions for the aggregate future policy benefit liabilities for individual and group traditional fixed annuities after annuitization 2.00%    
Interest rate assumptions for the aggregate future policy benefit liabilities for non-medical health insurance 4.00%    
Interest rate assumptions for the aggregate future policy benefit liabilities for disabled lives 2.00%    
Interest rate range credited to policyholder account balances 1.00%    
Domestic Business | Maximum      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Interest rate assumptions for the aggregate future policy benefit liabilities for individual and group traditional fixed annuities after annuitization 11.00%    
Interest rate assumptions for the aggregate future policy benefit liabilities for non-medical health insurance 7.00%    
Interest rate assumptions for the aggregate future policy benefit liabilities for disabled lives 8.00%    
Interest rate range credited to policyholder account balances 13.00%    
Domestic Business | Participating Life Insurance Policies      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies, low end 3.00%    
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies, high end 7.00%    
Domestic Business | Nonparticipating Life Insurance Policies      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies, low end 2.00%    
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies, high end 11.00%    
International Business | Minimum      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Interest rate assumptions for the aggregate future policy benefit liabilities for individual and group traditional fixed annuities after annuitization 1.00%    
Interest rate assumptions for the aggregate future policy benefit liabilities for disabled lives 1.00%    
Interest rate range credited to policyholder account balances 0.00%    
International Business | Maximum      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Interest rate assumptions for the aggregate future policy benefit liabilities for individual and group traditional fixed annuities after annuitization 12.00%    
Interest rate assumptions for the aggregate future policy benefit liabilities for disabled lives 9.00%    
Interest rate range credited to policyholder account balances 15.00%    
International Business | Participating Life Insurance Policies      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies, low end 1.00%    
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies, high end 11.00%    
International Business | Nonparticipating Life Insurance Policies      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies, low end 1.00%    
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies, high end 13.00%