Shareholders' Equity - Shares Repurchased (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended							9 Months Ended		10 Months Ended	12 Months Ended
	Nov. 08, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Nov. 08, 2024	Dec. 31, 2023	May 02, 2024
Equity, Class of Treasury Stock [Line Items]
Repurchases of common stock									$ 412	$ 90
Common Shares
Equity, Class of Treasury Stock [Line Items]
Repurchased additional authorized amount													$ 300
Shares repurchased (in shares)		1,658,441	1,928,328	1,539,278	1,659,680	1,065,902	453,942	36,369				3,215,893
Repurchases of common stock		$ 131	$ 152	$ 129	$ 109	$ 64	$ 24	$ 2				$ 199
Average price paid per share (in dollars per share)		$ 78.87	$ 78.50	$ 84.07	$ 65.83	$ 59.67	$ 53.08	$ 62.23				$ 61.95
Common Shares | Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Repurchased additional authorized amount	$ 250										$ 250
Remaining capacity of shares repurchase program	$ 385										$ 385
Shares repurchased (in shares)	692,513										5,818,560
Repurchases of common stock	$ 58										$ 470
Average price paid per share (in dollars per share)	$ 83.61										$ 80.69