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Equity Items - Summary of Reconciliation of Changes in Stockholders' Equity (Parenthetical) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Accelerated Share Repurchases [Line Items]        
Common shares issued 52,993 32,458 128,401 110,807
Stock based compensation employee withholding taxes $ 0 $ 1 $ 3 $ 4
Common shares repurchased 1,541,320 0 1,541,320 1,238,212
Stock repurchase during period value $ 100 $ 0 $ 100 $ 100
Excise tax on stock repurchases $ 1 $ 0 $ 1 $ 1