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Income Taxes - Additional information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes |  |  |  |  |
Investment impairment |  | $ 52 |  | $ 52 |
Income tax expense at U.S. federal statutory rate |  |  | 21.00% | 21.00% | 21.00%
Net reduction in income tax expense due to Tax Cuts and Jobs Act |  |  |  |  | $ (12)
Equity in net losses of unconsolidated entities |  |  | $ 68 | $ 55 | 41
Other federal tax credits |  |  | 7 | 11 | 10
Nondeductible acquisition transaction costs |  |  | 27 | 10 |
Reduction in provision for income taxes due to tax audit settlements |  |  | $ 10 | 2 | 40
Expected time of completion of IRS audits |  |  | 15 months |  |
Increase (decrease) to accruals and related deferred taxes |  |  | $ (3) | (22) | (52)
Reduction in provision for income taxes due to state net operating losses and credits |  |  | 12 | 14 | 22
Excess tax benefits associated with equity-based compensation |  |  | 27 | 25 | 17
Increase (decrease) in provision for income taxes due to impairments |  |  |  | 15 | 1
Investments Qualifying for Federal Tax Credits [Member] |  |  |  |  |
Income Taxes |  |  |  |  |
Equity in net losses of unconsolidated entities |  |  | 73 | 46 | 30
Income tax (expense) benefit, including tax credits, from equity method investment |  |  | 87 | 96 | 57
Interest expense |  |  | 11 | $ 9 | $ 3
Refined Coal Facility [Member] |  |  |  |  |
Income Taxes |  |  |  |  |
Equity method investments impairment charges | $ 7 |  | $ 7 |  |

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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=121548190&loc=d3e32787-111569 + Details
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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 nondeductible impairment loss. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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- 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://www.xbrl.org/2009/role/commonPracticeRef -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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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121573983&loc=d3e28511-109314 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121573983&loc=d3e28446-109314 + Details
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- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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