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Income Taxes - Additional information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 28, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes |  |  |  |  |  |
Investment impairment |  | $ 52 |  | $ 52 |  |
Income tax expense at U.S. federal statutory rate |  |  |  | 21.00% | 21.00% | 35.00%
Net reduction in income tax expense due to Tax Cuts and Jobs Act |  |  |  |  | $ (12) | $ (529)
Equity in net losses of unconsolidated entities |  |  |  | $ 55 | 41 | 68
Other federal tax credits |  |  |  | 11 | 10 | 13
Reduction in provision for income taxes due to tax audit settlements |  |  | $ 33 | $ 2 | 40 | 2
Expected time of completion of IRS audits |  |  |  | 15 months |  |
Increase (decrease) to accruals and related deferred taxes |  |  |  | $ (22) | (52) | (5)
Reduction in provision for income taxes due to state net operating losses and credits |  |  |  | 14 | 22 | 12
Excess tax benefits associated with equity-based compensation |  |  |  | 25 | 17 | 37
Increase (decrease) in provision for income taxes due to impairments |  |  |  | 15 | 1 | 15
Investments Qualifying for Federal Tax Credits [Member] |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Total consideration | $ 160 |  |  |  |  |
Payment to acquire investment | $ 20 |  |  |  |  |
Equity in net losses of unconsolidated entities |  |  |  | 46 | 30 | 30
Income tax (expense) benefit, including tax credits, from equity method investment |  |  |  | 96 | 57 | 51
Interest expense |  |  |  | $ 9 | $ 3 | $ 2

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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