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Goodwill and Other Intangible Assets - Changes in the Net Carrying Amount of the Components of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	$ 5,440		$ 5,440		$ 5,059
Finite-lived intangible assets, accumulated amortization	(3,996)		(3,996)		(3,918)
Finite-lived intangible assets, net amount	1,444		1,444		1,141
Intangible assets acquired			409
Amortization	(55)	$ (49)	(103)	$ (97)
Foreign exchange			(3)
Client relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	3,487		3,487		3,239
Finite-lived intangible assets, accumulated amortization	(2,766)		(2,766)		(2,710)
Finite-lived intangible assets, net amount	721		721		529
Intangible assets acquired			271
Amortization			(77)
Foreign exchange			(2)
Software [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	849		849		750
Finite-lived intangible assets, accumulated amortization	(750)		(750)		(749)
Finite-lived intangible assets, net amount	99		99		1
Intangible assets acquired			104
Amortization			(5)
Foreign exchange			(1)
Trademark and trade name [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	1,045		1,045		1,041
Finite-lived intangible assets, accumulated amortization	(451)		(451)		(430)
Finite-lived intangible assets, net amount	594		594		611
Intangible assets acquired			4
Amortization			(21)
Foreign exchange			0
Other [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	59		59		29
Finite-lived intangible assets, accumulated amortization	(29)		(29)		(29)
Finite-lived intangible assets, net amount	$ 30		30		$ 0
Intangible assets acquired			30
Amortization			0
Foreign exchange			$ 0