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Acquisition of Advanced Disposal - Purchase Allocation (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Oct. 30, 2020
Purchase price allocation
Goodwill	$ 8,992	$ 8,994
Carrying value of debt	13,244	$ 13,810
Advanced Disposal [Member]
Purchase price allocation
Accounts and other receivables	159
Parts and supplies	7
Other current assets	16
Assets held for sale	1,022
Property and equipment	1,285
Goodwill	2,475
Other intangible assets	601
Investments in unconsolidated entities	9
Other assets	25
Accounts payable	(106)
Accrued liabilities	(159)
Deferred revenues	(19)
Current portion of long-term debt	(12)
Liabilities held for sale	(234)
Long-term debt, less current portion	(441)
Landfill and environmental remediation liabilities	(243)
Deferred income taxes	(222)
Other liabilities	(81)
Total purchase price	$ 4,082
Advanced Disposal [Member] | Advanced Disposal 5.625% senior notes due 2024 [Member]
Purchase price allocation
Carrying value of debt			$ 425
Interest rate (as a percent)			5.625%
Fair value of debt			$ 438
Advanced Disposal [Member] | Previously Reported [Member]
Purchase price allocation
Accounts and other receivables			159
Parts and supplies			8
Other current assets			17
Assets held for sale			1,022
Property and equipment			1,278
Goodwill			2,470
Other intangible assets			604
Investments in unconsolidated entities			9
Other assets			27
Accounts payable			(107)
Accrued liabilities			(155)
Deferred revenues			(19)
Current portion of long-term debt			(12)
Liabilities held for sale			(234)
Long-term debt, less current portion			(441)
Landfill and environmental remediation liabilities			(242)
Deferred income taxes			(223)
Other liabilities			(79)
Total purchase price			4,082
Advanced Disposal [Member] | Adjustment [Member]
Purchase price allocation
Parts and supplies			(1)
Other current assets			(1)
Property and equipment			7
Goodwill			5
Other intangible assets			(3)
Other assets			(2)
Accounts payable			1
Accrued liabilities			(4)
Landfill and environmental remediation liabilities			(1)
Deferred income taxes			1
Other liabilities			$ (2)

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