CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Retained Earnings	Non-Controlling Interest
Beginning Balance, Value at Dec. 31, 2021	$ 4,197	$ 30	$ 849	$ (674)	$ (9)	$ 4,001
Beginning Balance, Shares at Dec. 31, 2021		282
Net Income	672					672
Net unrealized holding gain (loss) on available-for-sale securities	(2)				(2)
Foreign currency translation	(137)		1		(138)
Employee stock purchase plan	47		47
Employee stock purchase plan, Shares		1
Stock incentive plans	56		56
Stock incentive plans, Shares		2
Agency acquisition	15		15
Directors	1		1
Repurchase shares to fund tax withholdings for non-cash stock-based compensation	(49)		(49)
Repurchase shares to fund tax withholdings for non-cash stock-based compensation, shares		(1)
Purchase of treasury stock	(74)			(74)
Purchase of treasury stock, Shares		(1)
Cash dividends paid	(120)					(120)
Ending Balance, Value at Dec. 31, 2022	4,606	$ 30	920	(748)	(149)	4,553
Ending Balance, Shares at Dec. 31, 2022		283
Net Income	871					871
Net unrealized holding gain (loss) on available-for-sale securities	1				1
Foreign currency translation	129				129
Employee stock purchase plan	52		52
Employee stock purchase plan, Shares		1
Stock incentive plans	76		76
Stock incentive plans, Shares		1
Agency acquisition	18		18
Directors	1		1
Repurchase shares to fund tax withholdings for non-cash stock-based compensation	(40)		(40)
Cash dividends paid	(135)					(135)
Ending Balance, Value at Dec. 31, 2023	$ 5,579	$ 30	1,027	(748)	(19)	5,289
Ending Balance, Shares at Dec. 31, 2023	285	285
Net Income	$ 1,002					993	$ 9
Net unrealized holding gain (loss) on available-for-sale securities	1				1
Foreign currency translation	(91)				(91)
Employee stock purchase plan	58		57
Employee stock purchase plan, Shares		1
Stock incentive plans	86		86
Stock incentive plans, Shares		1
Directors	1		1
Net non-controlling interest acquired (disposed)	10		2				8
Repurchase shares to fund tax withholdings for non-cash stock-based compensation	(55)		(55)
Repurchase shares to fund tax withholdings for non-cash stock-based compensation, shares		(1)
Cash dividends paid	(154)					(154)
Ending Balance, Value at Dec. 31, 2024	$ 6,437	$ 31	$ 1,118	$ (748)	$ (109)	$ 6,128	$ 17
Ending Balance, Shares at Dec. 31, 2024	286	286