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Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities by Sector) (Details)
$ in Millions
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value $ 11,735 $ 8,061
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses $ 692 $ 585
Fixed maturity securities in continuous unrealized loss position, less than 12 months, number of securities 1,825 1,347
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value $ 49,262 $ 51,758
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses $ 7,086 $ 6,571
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, number of securities 6,712 7,038
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 $ 6,092 $ 4,554
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 479 409
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 22,465 22,796
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 3,294 2,987
Foreign corporate    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value 1,683 1,010
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 87 73
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 8,111 8,311
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 1,334 1,216
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 1,158 518
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 30 9
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 2,901 3,477
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 556 514
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value 709 413
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 21 20
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 5,616 5,774
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 893 792
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value 367 411
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 28 33
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 5,754 5,786
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 524 581
ABS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value 1,057 572
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 5 3
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 2,111 3,360
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 104 128
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 608 471
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 41 32
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 1,639 1,634
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses 284 272
Foreign government    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value 61 112
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses 1 6
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value 665 620
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses $ 97 $ 81