Goodwill And Other Acquired Intangible Assets - Activity in Goodwill (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance, goodwill gross		$ 5,851
Beginning balance, Accumulated impairment charge		(12)
Beginning balance, goodwill net		5,839
Additions/ adjustments	$ 16	3
Foreign currency translation adjustments	(81)	114
Ending balance, goodwill gross	5,903	5,968
Ending balance, Accumulated impairment charge	(12)	(12)
Ending balance, goodwill net	5,891	5,956
MA
Goodwill [Roll Forward]
Beginning balance, goodwill gross		5,474
Beginning balance, Accumulated impairment charge		(12)
Beginning balance, goodwill net		5,462
Additions/ adjustments	14	90
Foreign currency translation adjustments	(79)	117
Ending balance, goodwill gross	5,616	5,681
Ending balance, Accumulated impairment charge	(12)	(12)
Ending balance, goodwill net	5,604	5,669
MIS
Goodwill [Roll Forward]
Beginning balance, goodwill gross		377
Beginning balance, Accumulated impairment charge		0
Beginning balance, goodwill net		377
Additions/ adjustments	2	(87)
Foreign currency translation adjustments	(2)	(3)
Ending balance, goodwill gross	287	287
Ending balance, Accumulated impairment charge	0	0
Ending balance, goodwill net	$ 287	$ 287