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Investments Investments - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Net unrealized gains related to changes in valuation of fixed income securities subsequent to impairment measurement date $ 111,000,000   $ 113,000,000
Unrealized losses related to securities with unrealized loss position less than 20% of amortized cost or cost 233,000,000    
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of amortized cost or cost 19,000,000    
Limited partnership interests 3,413,000,000   3,147,000,000
Short-term investments 596,000,000   725,000,000
Other 1,310,000,000   1,254,000,000
Fixed income securities      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Gross gains on sales of fixed income securities 7,000,000 $ 33,000,000  
Gross losses on sales of fixed income securities 12,000,000 21,000,000  
Fixed income and equity securities      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Available for sale securities unrealized losses (252,000,000)   (101,000,000)
Investment grade fixed income securities      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Unrealized losses related to securities with unrealized loss position less than 20% of amortized cost or cost 190,000,000    
Available for sale securities unrealized losses (202,000,000)   (74,000,000)
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of amortized cost or cost 12,000,000    
Below investment grade equity securities      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of amortized cost or cost 7,000,000    
Below investment grade fixed income securities      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Unrealized losses related to securities with unrealized loss position less than 20% of amortized cost or cost 43,000,000    
Available for sale securities unrealized losses (50,000,000)   (24,000,000)
Available for sale securities, unrealized losses having loss of less than twenty percent, less than 12 months 32,000,000    
Unrealized Losses for fixed income securities held for twelve months or longer period 3,000,000    
Equity method limited partnerships      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Limited partnership interests 2,660,000,000   2,540,000,000
Carrying value | Cost method limited partnership interests      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Limited partnership interests 751,000,000   611,000,000
Non-impaired mortgage loans      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) 0 0  
Mortgage loans      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Average balance impaired mortgage loans 4,000,000 $ 5,000,000  
Policy loans      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Other $ 558,000,000   $ 561,000,000