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Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities by Sector) (Details)
$ in Millions
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value $ 32,294 $ 52,375
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses $ 2,517 $ 6,644
Fixed maturity securities in continuous unrealized loss position, less than 12 months, number of securities 4,595 7,309
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value $ 30,336 $ 11,944
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses $ 5,616 $ 2,868
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, number of securities 4,746 2,049
U.S. corporate    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value $ 15,735 $ 24,509
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 1,324 3,351
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 12,122 3,979
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 2,555 1,170
Foreign corporate    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value 4,986 8,260
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 423 1,413
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 4,828 1,601
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 1,215 519
U.S. government and agency    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value 1,515 3,121
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 119 265
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 2,266 1,147
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 376 337
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value 3,017 4,731
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 209 497
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 3,942 2,246
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 602 448
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value 3,582 5,589
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 265 543
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 3,041 970
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 401 167
State and political subdivision    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value 1,223 2,041
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 100 317
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 789 247
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 201 83
ABS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value 1,828 3,347
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 50 159
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 2,980 1,733
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 198 137
Foreign Government    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value 408 777
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 27 99
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 368 21
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses $ 68 $ 7