Goodwill And Other Acquired Intangible Assets - Activity in Goodwill (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance, goodwill gross	$ 5,851	$ 6,011
Beginning balance, Accumulated impairment charge	(12)	(12)
Beginning balance, goodwill net	5,839	5,999
Additions/ adjustments	3	92
Foreign currency translation adjustments	(11)	(252)
Ending balance, goodwill gross	5,843	5,851
Ending balance, Accumulated impairment charge	(12)	(12)
Ending balance, goodwill net	5,831	5,839
MA
Goodwill [Roll Forward]
Beginning balance, goodwill gross	5,474	5,615
Beginning balance, Accumulated impairment charge	(12)	(12)
Beginning balance, goodwill net	5,462	5,603
Additions/ adjustments	90	88
Foreign currency translation adjustments	(9)	(229)
Ending balance, goodwill gross	5,555	5,474
Ending balance, Accumulated impairment charge	(12)	(12)
Ending balance, goodwill net	5,543	5,462
MIS
Goodwill [Roll Forward]
Beginning balance, goodwill gross	377	396
Beginning balance, Accumulated impairment charge	0	0
Beginning balance, goodwill net	377	396
Additions/ adjustments	(87)	4
Foreign currency translation adjustments	(2)	(23)
Ending balance, goodwill gross	288	377
Ending balance, Accumulated impairment charge	0	0
Ending balance, goodwill net	$ 288	$ 377