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Investments - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Gross gains on sales of fixed income securities, debt $ 24,000,000 $ 5,000,000 $ 50,000,000 $ 25,000,000  
Gross losses on sales of fixed income securities, debt 4,000,000 9,000,000 29,000,000 45,000,000  
Net unrealized gains related to changes in valuation of fixed income securities subsequent to impairment measurement date 105,000,000   105,000,000   $ 101,000,000
Carrying value of limited partnerships 3,304,000,000   3,304,000,000   3,292,000,000
Short-term investments 1,475,000,000   1,475,000,000   810,000,000
Carrying value of policy loans 555,000,000   555,000,000   561,000,000
Equity method limited partnerships          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Carrying value of limited partnerships 2,540,000,000   2,540,000,000   2,510,000,000
Carrying value | Cost method limited partnership interests          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Carrying value of limited partnerships 762,000,000   762,000,000   $ 787,000,000
Non-impaired mortgage loans          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Change in valuation allowance on impaired mortgage loans $ 0 $ 0 0 0  
Mortgage loans          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Average balance of impaired loans     $ 4,000,000 $ 4,000,000