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Investments - Unrealized Capital Losses 1 (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
securities
Dec. 31, 2019
USD ($)
securities
Available-for-sale Securities Including Securities Pledged [Line Items]    
Available For Sale Securities Change in Loss Position $ 951  
Total Unrealized Capital Losses 1,014 $ 63
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss $ 113 $ 46
More than twelve months below amortized cost, Number of Securities | securities 189 278
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 $ 7  
More than twelve months below amortized cost, Number of Securities | securities 3