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Debt - Subordinated Debt (Details) - Subordinated Debt Notes - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Amount outstanding $ 2,250,000 $ 2,250,000
ECAPS Subordinated Notes    
Debt Instrument [Line Items]    
Amount outstanding $ 1,000,000 1,000,000
Weighted average interest rate 7.29%  
2045 Subordinated Notes    
Debt Instrument [Line Items]    
Amount outstanding $ 500,000 500,000
Weighted average interest rate 6.50%  
2079 Subordinated Notes    
Debt Instrument [Line Items]    
Amount outstanding $ 750,000 $ 750,000
Weighted average interest rate 5.88%