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Investments - OTTI (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
securities
Jun. 30, 2019
USD ($)
securities
Jun. 30, 2020
USD ($)
securities
Jun. 30, 2019
USD ($)
securities
Available-for-sale Securities Including Securities Pledged [Line Items]        
Impairment $ 24 $ 1 $ 31 $ 19
No. of Securities | securities 250 9 258 20
Write-downs related to credit impairments $ 0 $ 0 $ 0 $ 18
Intent Impairments 24 1 31 1
Other than Temporary Impairment Losses, Investments, Portion Recognized in Assets, Intent Impairments, Designated to be included in reinsurance agreement with Individual Life Transaction     24  
U.S. corporate public securities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Impairment $ 5 $ 0 $ 11 $ 0
No. of Securities | securities 36 0 38 0
Foreign corporate public securities and foreign governments        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Impairment $ 1 $ 1 $ 1 $ 1
No. of Securities | securities 20 1 20 1
Foreign corporate private securities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Impairment $ 0 $ 0 $ 0 $ 18
No. of Securities | securities 7 0 7 3
Residential mortgage-backed        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Impairment $ 1 $ 0 $ 2 $ 0
No. of Securities | securities 27 7 32 13
Commercial mortgage-backed        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Impairment $ 16 $ 0 $ 16 $ 0
No. of Securities | securities 94 0 95 0
Limited Partnerships        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Impairment $ 0 $ 0 $ 0 $ 0
No. of Securities | securities 0 0 0 0
U.S. corporate private securities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Impairment $ 0 $ 0 $ 0 $ 0
No. of Securities | securities 1 0 1 0
State, municipalities and political subdivisions        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Impairment $ 0 $ 0 $ 0 $ 0
No. of Securities | securities 5 0 5 0
Other Asset-backed Securities [Member]        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Impairment $ 1 $ 0 $ 1 $ 0
No. of Securities | securities 60 1 60 3