Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenue	$ 2,341	$ 2,244
Costs of providing services
Salaries and benefits	1,342	1,313
Other operating expenses	457	453
Depreciation	59	60
Amortization	60	71
Restructuring costs	18	3
Transaction and transformation	125	59
Total costs of providing services	2,061	1,959
Income from operations	280	285
Interest expense	(64)	(54)
Other income, net	26	25
INCOME FROM OPERATIONS BEFORE INCOME TAXES	242	256
Provision for income taxes	(48)	(50)
NET INCOME	194	206
Income attributable to non-controlling interests	(4)	(3)
NET INCOME ATTRIBUTABLE TO WTW	$ 190	$ 203
Basic earnings per share:
Basic earnings per share	$ 1.84	$ 1.89
Diluted earnings per share:
Diluted earnings per share	$ 1.83	$ 1.88
Comprehensive income before non-controlling interests	$ 145	$ 259
Comprehensive income attributable to non-controlling interests	(4)	(3)
Comprehensive income attributable to WTW	$ 141	$ 256