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Investments (Fair Value Below Amortized Cost of Gross Unrealized Losses for Fixed Maturity Securities) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Gross unrealized losses with number of securities [Line Items]    
Document Period End Date Sep. 30, 2021  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 326 $ 197
% of Total 100.00% 100.00%
Less than 20%    
Gross unrealized losses with number of securities [Line Items]    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 266 $ 133
% of Total 81.60% 67.50%
20% or more for less than six months    
Gross unrealized losses with number of securities [Line Items]    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 11 $ 42
% of Total 3.40% 21.30%
20% or more for six months or greater    
Gross unrealized losses with number of securities [Line Items]    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 49 $ 22
% of Total 15.00% 11.20%