Shareholders' Equity - Treasury Stock (Details) - Treasury Stock - USD ($) shares in Thousands	3 Months Ended
	Dec. 31, 2021	Oct. 31, 2021
Schedule of Common Stock and Treasury Stock [Line Items]
Authorized share repurchase program	$ 500,000,000
Stock repurchase program, remaining authorized repurchase amount	113,000,000
Share Repurchase Program
Schedule of Common Stock and Treasury Stock [Line Items]
Authorized share repurchase program	500,000,000	$ 500,000,000
Share repurchase cost	387,000,000
Share repurchase fees	$ 1,000,000
Number of shares repurchased	19,401
Previous Share Repurchase Program
Schedule of Common Stock and Treasury Stock [Line Items]
Authorized share repurchase program		1,100,000,000
Stock repurchase program, remaining authorized repurchase amount		$ 450,000