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Shareholders' Equity - Share Repurchases through Share Repurchase Agreements with Third Party Financial Institutions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 15, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Equity [Abstract]            
Initial Shares Delivered (in shares)       1,127,396   8,600,000
Class of Stock [Line Items]            
Payment for share repurchases   $ 100 $ 172 $ 100 $ 520  
Common stock acquired - share repurchase (in shares)       1,127,396   8,600,000
Subsequent Event            
Equity [Abstract]            
Initial Shares Delivered (in shares) 218,336          
Class of Stock [Line Items]            
Common stock acquired - share repurchase (in shares) 218,336          
Share Repurchase Program, Authorized, Number of Shares 1,345,732