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Income Taxes - Quarter information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Taxes |  |  |  |  |  |
Effective tax rate of income (loss) before income taxes | 22.20% |  | 23.30% |  | 19.50% | 24.00%
Equity in net losses of unconsolidated entities | $ 14 |  | $ 16 |  | $ 40 | $ 25
Excess tax benefits associated with equity-based compensation | 2 |  | 5 |  | 23 | 17
Investment impairment |  |  |  | $ 52 |  |
Asset impairments | 61 |  |  |  |  |
Landfill [Member] |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Asset impairments | 20 |  |  |  |  |
Investments Qualifying for Federal Tax Credits [Member] |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Equity in net losses of unconsolidated entities | 17 |  | 12 |  | 43 | 21
Income tax (expense) benefit, including tax credits, from equity method investment | 17 |  | 18 |  | 41 | 33
Interest expense | $ 3 |  | $ 2 |  | 6 | $ 4
Refined Coal Facility [Member] |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Equity method investments impairment charges |  | $ 7 |  |  | $ 7 |

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