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Acquisition of Advanced Disposal (Detail) $ / shares in Units, customer in Millions, $ in Millions	Oct. 30, 2020 USD ($) customer $ / shares	Jun. 30, 2021 USD ($)	May 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Nov. 30, 2020 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 8,992		$ 8,994
364-day revolving credit facility [Member]
Business Acquisition [Line Items]
Maximum capacity	$ 3,000
Senior Notes, Aggregate [Member]
Business Acquisition [Line Items]
Debt instrument face amount			$ 950		$ 2,500
Advanced Disposal [Member]
Business Acquisition [Line Items]
Price per share | $ / shares	$ 30.30
Total consideration	$ 4,600
Debt incurred for acquisition	$ 1,800
Number of customers | customer	3
Goodwill		$ 2,475

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