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Income Taxes - Quarter information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Taxes |  |  |  |  |
Income tax expense | $ 115 |  | $ 110 | $ 230 | $ 226
Effective tax rate of income (loss) before income taxes | 23.30% |  | 18.10% | 24.00% | 20.20%
Tax audit settlement |  |  | $ (33) |  | $ (33)
Investment impairment |  | $ 52 |  |  |
Equity in net losses of unconsolidated entities | $ 16 |  | 13 | $ 25 | 20
Excess tax benefits associated with equity-based compensation | 5 |  | 1 | 17 | 12
Investments Qualifying for Federal Tax Credits [Member] |  |  |  |  |
Income Taxes |  |  |  |  |
Interest expense recognized | 2 |  |  | 4 |
Equity in net losses of unconsolidated entities | 12 |  | 6 | 21 | 12
Income tax (expense) benefit, including tax credits, from equity method investment | $ 18 |  | $ 12 | $ 33 | $ 22

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