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Investments - Unrealized Capital Losses 1 (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
securities
Dec. 31, 2020
USD ($)
securities
Available-for-sale Securities Including Securities Pledged [Line Items]    
Available For Sale Securities Change in Loss Position $ 5  
Total Unrealized Capital Losses 102 $ 107
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss $ 42 $ 29
More than twelve months below amortized cost, Number of Securities | securities 318 163
Fair value decline below amortized cost greater than 20%    
Available-for-sale Securities Including Securities Pledged [Line Items]    
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss $ 5  
More than twelve months below amortized cost, Number of Securities | securities 5