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Statutory Requirements - Statutory Permitted Practices (Details) - Bermuda
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
ALRe  
Statutory Accounting Practices [Line Items]  
Statutory Accounting Practices, Permitted Practice, Increase (Decrease) To Capital And Surplus $ 6,029
Statutory Accounting Practices, Permitted Practice, Increase (Decrease) To Statutory Net Income 2,605
AARe  
Statutory Accounting Practices [Line Items]  
Statutory Accounting Practices, Permitted Practice, Increase (Decrease) To Capital And Surplus 19,671
Statutory Accounting Practices, Permitted Practice, Increase (Decrease) To Statutory Net Income 5,299
ACRA  
Statutory Accounting Practices [Line Items]  
Statutory Accounting Practices, Permitted Practice, Increase (Decrease) To Capital And Surplus 8,289
Statutory Accounting Practices, Permitted Practice, Increase (Decrease) To Statutory Net Income $ 5,945