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Debt - Borrowings and Repayments (Detail) $ in Millions, $ in Millions				1 Months Ended				3 Months Ended		12 Months Ended
	Nov. 30, 2020 USD ($)	Oct. 30, 2020 USD ($)	Jul. 20, 2020 USD ($)	Nov. 30, 2020 USD ($)	Oct. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	May 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 CAD ($)	Jul. 28, 2020 USD ($)	Jul. 01, 2020 USD ($)
Debt
Net commercial paper borrowings (repayments)										$ 1,808.0	$ (1,001.0)	$ 453.0
Debt repayments										7,807.0	533.0	499.0
New borrowings										5,790.0	4,683.0	$ 359.0
Premiums paid on early extinguishment of debt										30.0	84.0
Loss on early extinguishment of debt, net										(53.0)	(85.0)
Debt issuance costs, discounts and other								$ 85.0		85.0	85.0
Carrying value of debt								13,810.0		13,810.0	13,498.0
Scheduled Debt Payments
Principal payments in 2021								2,056.0		2,056.0
Principal payments in 2022								665.0		665.0
Principal payments in 2023								647.0		647.0
Principal payments in 2024								468.0		468.0
Principal payments in 2025								1,451.0		1,451.0
Principal payments thereafter								8,700.0		8,700.0
Advanced Disposal [Member]
Debt
Debt assumed		$ 441.0
Commercial Paper Program [Member]
Debt
Net commercial paper borrowings (repayments)										1,800.0
Carrying value of debt								1,814.0		1,814.0
4.75% senior notes due June 2020 [Member]
Debt
Debt repayments						$ 600.0
Interest rate (as a percent)						4.75%
Senior Notes, Aggregate [Member]
Debt
New borrowings				$ 2,480.0			$ 4,000.0
Debt instrument face amount	$ 2,500.0			$ 2,500.0
Carrying value of debt								$ 8,465.0		$ 8,465.0	9,965.0
Senior Notes, Aggregate [Member] \| Minimum [Member]
Debt
Interest rate (as a percent)								0.75%		0.75%			0.75%
Senior Notes, Aggregate [Member] \| Maximum [Member]
Debt
Interest rate (as a percent)								7.75%		7.75%			7.75%
Senior Notes, Mandatory Redemption Feature [Member]
Debt
Redemption price percentage							101.00%
Debt repayments			$ 3,000.0
New borrowings							$ 3,000.0
Premiums paid on early extinguishment of debt			30.0						$ 30.0
Interest Payable, Current			$ 8.0
Loss on early extinguishment of debt, net									(52.0)
Debt issuance costs, discounts and other															$ 22.0
4.60% senior notes due March 2021 [Member]
Debt
Interest rate (as a percent)	4.60%			4.60%
Interest Payable, Current	$ 5.0			$ 5.0
Debt instrument face amount	400.0			400.0
364-day revolving credit facility [Member]
Debt
Maximum capacity														$ 3,000.0
Proceeds from Lines of Credit					$ 3,000.0
Debt repayments		$ 870.0
Loss on early extinguishment of debt, net				(2.0)				$ (2.0)
Advanced Disposal 5.625% senior notes due 2024 [Member] \| Advanced Disposal [Member]
Debt
Debt repayments	$ 437.0
Interest rate (as a percent)		5.625%
Aggregate principal amounts of notes redeemed (as a percent)	102.813%
Interest Payable, Current	$ 13.0			$ 13.0
Loss on early extinguishment of debt, net	$ 1.0
Carrying value of debt		$ 425.0
Fair value of notes		$ 438.0
Canadian Senior Notes [Member]
Debt
Interest rate (as a percent)								2.60%		2.60%			2.60%
Carrying value of debt								$ 393.0		$ 393.0	385.0		$ 500
Tax Exempt Bonds [Member]
Debt
Debt repayments										82.0
New borrowings										131.0
Carrying value of debt								$ 2,571.0		$ 2,571.0	2,523.0
Debt refunded and reissued									$ 130.0
Tax Exempt Bonds [Member] \| Minimum [Member]
Debt
Interest rate (as a percent)								0.10%		0.10%			0.10%
Tax Exempt Bonds [Member] \| Maximum [Member]
Debt
Interest rate (as a percent)								4.30%		4.30%			4.30%
Financing leases and other [Member]
Debt
Debt repayments										$ 108.0
Carrying value of debt								$ 652.0		652.0	$ 710.0
Non cash transactions increase										$ 50.0
Senior Notes 0.750 Percent Due November 2025 [Member]
Debt
Interest rate (as a percent)	0.75%			0.75%
Debt instrument face amount	$ 500.0			$ 500.0
Senior Notes 1.150 Percent Due March 2028 [Member]
Debt
Interest rate (as a percent)	1.15%			1.15%
Debt instrument face amount	$ 500.0			$ 500.0
Senior Notes 1.500 Percent Due March 2031 [Member]
Debt
Interest rate (as a percent)	1.50%			1.50%
Debt instrument face amount	$ 1,000.0			$ 1,000.0
Senior Notes 2.500 Percent Due November 2050 [Member]
Debt
Interest rate (as a percent)	2.50%			2.50%
Debt instrument face amount	$ 500.0			$ 500.0