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Insurance (Insurance Liabilities Assumptions and Ratios - Narrative) (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Liability for Future Policy Benefits and Policyholder Account Balances [Abstract]      
Participating business as a percentage of gross life insurance policies in-force 4.00% 3.00%  
Participating business as a percentage of the gross life insurance premiums 42.00% 39.00% 35.00%
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 3.00%    
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 3.00%    
Interest rate range credited to policyholder account balances 1.00%    
Maximum [Member]      
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 8.00%    
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 7.00%    
Interest rate range credited to policyholder account balances 8.00%    
Participating Life Insurance Policies | Minimum      
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 .04    
Nonparticipating Life Insurance Policies | Minimum      
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 .03    
Nonparticipating Life Insurance Policies | Maximum [Member]      
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 .08