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Investments - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Investment [Line Items]          
Gross gains on fixed income securities $ 115,000,000 $ 29,000,000 $ 241,000,000 $ 74,000,000  
Gross loss on fixed income securities (27,000,000) (107,000,000) (87,000,000) (194,000,000)  
Net unrealized gains related to changes in valuation of fixed income securities subsequent to impairment measurement date 185,000,000   185,000,000   $ 180,000,000
Limited partnership interests 7,818,000,000   7,818,000,000   7,505,000,000
Short-term investments 3,740,000,000   3,740,000,000   3,027,000,000
EMA limited partnerships          
Investment [Line Items]          
Limited partnership interests 6,030,000,000.00   6,030,000,000.00   5,730,000,000
Carrying value | Cost-method Investments          
Investment [Line Items]          
Cost method limited partnerships 1,790,000,000   1,790,000,000   $ 1,780,000,000
Mortgage loans, non-impaired          
Investment [Line Items]          
Allowance for credit losses, period increase (decrease) $ 0 $ 0 0 0  
Average impaired mortgage loans     $ 4,000,000 $ 4,000,000