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Investments Investments - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Gross gains on sales of fixed income securities, debt $ 13,000,000   $ 20,000,000    
Gross gains on sales of fixed income securities   $ 22,000,000   $ 55,000,000  
Gross losses on sales of fixed income securities, debt 24,000,000   36,000,000    
Gross losses on sales of fixed income securities   $ 23,000,000   44,000,000  
Net unrealized gains related to changes in valuation of fixed income securities subsequent to impairment measurement date 109,000,000   109,000,000   $ 113,000,000
Unrealized losses related to securities with unrealized loss position less than 20% of amortized cost or cost 303,000,000   303,000,000    
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of amortized cost or cost 14,000,000   14,000,000    
Limited partnership interests 3,452,000,000   3,452,000,000   3,147,000,000
Short-term investments 1,066,000,000   1,066,000,000   725,000,000
Other 1,322,000,000   1,322,000,000   1,254,000,000
Fixed income securities          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Total unrealized losses 317,000,000   317,000,000   98,000,000
Fixed income and equity securities          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Total unrealized losses 317,000,000   317,000,000    
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 251,000,000   251,000,000    
Total unrealized losses 262,000,000   262,000,000   74,000,000
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of amortized cost or cost 11,000,000   11,000,000    
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 3,000,000   3,000,000    
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 52,000,000   52,000,000    
Total unrealized losses 55,000,000   55,000,000   24,000,000
Available for sale securities, unrealized losses having loss of less than twenty percent, less than 12 months 44,000,000   44,000,000    
Equity method limited partnerships          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Limited partnership interests 2,710,000,000   2,710,000,000   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 740,000,000   740,000,000   611,000,000
Non-impaired mortgage loans          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
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 $ 557,000,000   $ 557,000,000   $ 561,000,000