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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 |  |  |  |  |  |  |  |  |  |  |

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