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Shareholders' Equity - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Dec. 31, 2023
Class of Stock [Line Items]              
Remaining authorized repurchase amount   $ 551   $ 551      
Common stock acquired - share repurchase (in shares)       4,900,000   5,400,000  
Common stock acquired - share repurchase amount, excluding excise tax       $ 346      
Payment for share repurchases   $ 176 $ 162 $ 348 $ 162    
Preferred Stock, shares authorized (in shares)   100,000,000   100,000,000     100,000,000
Preferred Stock, amount of preferred dividends in arrears       $ 0      
Subsequent Event              
Class of Stock [Line Items]              
Common stock acquired - share repurchase (in shares) 871,636            
Payment for share repurchases $ 63