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Investments - Other Than Temporary Impairment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cumulative Credit Impairments    
Beginning balance $ (19) $ (25)
Fixed maturities not previously impaired (3) 0
Fixed maturities previously impaired 0 (1)
Fixed maturities that matured or were sold during the period 3 7
Ending balance $ (19) $ (19)