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Subsequent Events (Details) - USD ($)
Mar. 14, 2025
Feb. 24, 2025
Feb. 23, 2025
Jan. 27, 2025
Jan. 10, 2025
Jun. 10, 2020
Nov. 21, 2019
Dec. 31, 2024
Dec. 31, 2023
Series A Preferred Stock                  
Subsequent Event [Line Items]                  
Sale of stock, number of shares issued in transaction (in shares)             16,000    
Fixed cumulative preferential cash dividend             5.95%    
Preferred stock, par value (in usd per share)             $ 1.00 $ 1 $ 1
Preferred stock, liquidation preference, value             $ 25,000    
Issuance of preferred equity             $ 389,000,000    
Series B Preferred Stock                  
Subsequent Event [Line Items]                  
Sale of stock, number of shares issued in transaction (in shares)           12,000      
Fixed cumulative preferential cash dividend           6.625%      
Preferred stock, par value (in usd per share)           $ 1.00   $ 1 $ 1
Preferred stock, liquidation preference, value           $ 25,000      
Issuance of preferred equity           $ 290,000,000      
Subsequent Event | 5.550% Fixed Rate Notes Due, January 2030 | American National Global Funding                  
Subsequent Event [Line Items]                  
Interest rate     5.55%            
Net proceed from the notes     $ 497,000,000            
Subsequent Event | Series D Preferred Stock                  
Subsequent Event [Line Items]                  
Sale of stock, number of shares issued in transaction (in shares)         12,000        
Fixed cumulative preferential cash dividend         7.375%        
Preferred stock, par value (in usd per share)         $ 1.00        
Preferred stock, liquidation preference, value         $ 25,000        
Issuance of preferred equity         $ 292,000,000        
Dividends, preferred stock, cash $ 6,000,000                
Subsequent Event | Series A Preferred Stock                  
Subsequent Event [Line Items]                  
Fixed cumulative preferential cash dividend   5.95%              
Stock redeemed or called during period, shares (in shares)   16,000              
Subsequent Event | Series B Preferred Stock                  
Subsequent Event [Line Items]                  
Dividends, preferred stock, cash       $ 5,000,000