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Segment and Related Information - Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Goodwill, Beginning Balance	$ 6,532	$ 6,430
Acquired goodwill	2,470	108	$ 248
Divested goodwill	(15)
Impairments		(27)
Foreign currency translation and other	7	21
Goodwill, Ending Balance	8,994	6,532	6,430
Goodwill post-closing adjustment increase (decrease)	(3)
Tier 1 [Member]
Segment Reporting Information [Line Items]
Goodwill, Beginning Balance	2,283	2,193
Acquired goodwill	1,109	90
Foreign currency translation and other	(1)
Goodwill, Ending Balance	3,391	2,283	2,193
Tier 2 [Member]
Segment Reporting Information [Line Items]
Goodwill, Beginning Balance	1,617	1,584
Acquired goodwill	374	12
Divested goodwill	(12)
Foreign currency translation and other	9	21
Goodwill, Ending Balance	1,988	1,617	1,584
Tier 3 [Member]
Segment Reporting Information [Line Items]
Goodwill, Beginning Balance	2,562	2,556
Acquired goodwill	987	6
Divested goodwill	(3)
Foreign currency translation and other	(1)
Goodwill, Ending Balance	3,545	2,562	2,556
Other [Member]
Segment Reporting Information [Line Items]
Goodwill, Beginning Balance	70	97
Impairments		(27)
Goodwill, Ending Balance	$ 70	$ 70	$ 97

X

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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