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Goodwill and Other Intangible Assets - Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible assets
Goodwill	$ 8,994	$ 6,532	$ 6,430
Increase in goodwill during the period	2,462
Intangible assets	1,646	1,088
Less: Accumulated amortization	(622)	(567)
Total	1,024	521
Customer and supplier relationships [Member]
Intangible assets
Intangible assets	1,436	906
Less: Accumulated amortization	(497)	(469)
Total	939	437
Covenants not-to-compete [Member]
Intangible assets
Intangible assets	68	72
Less: Accumulated amortization	(46)	(36)
Total	22	36
Licenses Permits and Other [Member]
Intangible assets
Intangible assets	142	110
Less: Accumulated amortization	(79)	(62)
Total	$ 63	$ 48

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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