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Income Taxes - Quarter information (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 28, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018
Income Taxes |  |  |  |  |  |  |  |
Effective tax rate of income (loss) before income taxes |  |  | 19.40% |  | 16.60% | 22.20% | 18.90% |
Equity in net losses of unconsolidated entities |  |  | $ 14 |  | $ 9 | $ 39 | $ 29 |
Excess tax benefits associated with equity-based compensation |  |  | 5 |  | 3 | 22 | 15 |
Increase (decrease) to accruals and related deferred taxes |  |  | 13 |  | 27 | 13 | 35 |
Net reduction in income tax expense due to Tax Cuts and Jobs Act |  | $ (12) |  |  |  |  |  |
Tax audit settlement |  |  |  |  |  |  |  | $ (33)
Investment impairment |  |  |  | $ 52 |  |  |  |
Landfill [Member] |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  | 29 |  |  |
Investments Qualifying for Federal Tax Credits [Member] |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Investment consideration | $ 160 |  |  |  |  |  |  |
Capital obligations | 140 |  |  |  |  |  |  |
Payment to acquire investment | $ 20 |  |  |  |  |  |  |
Equity in net losses of unconsolidated entities |  |  | 11 |  | 5 | 32 | 17 |
Income tax (expense) benefit, including tax credits, from equity method investment |  |  | 36 |  | $ 18 | 69 | $ 40 |
Interest expense recognized |  |  | $ 2 |  |  | $ 6 |  |

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