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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 18, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Effective income tax rate |  | 18.90% | 16.10% | 22.50% | 13.60%
Federal statutory income tax rate |  |  |  | 21.00% | 21.00%
Reduction in valuation allowance |  | $ 13 |  | $ 13 |
Discrete tax benefit related to the statute of limitations |  | $ 9 | $ 23 | $ 9 | $ 15
Additional interest related to uncertain tax positions |  |  | $ 4 |  | 4
Tax benefit due to prior period adjustments |  |  |  |  | (8)
Federal return to provision adjustments |  |  |  |  | 27
Excess tax expense, share-based payment arrangement |  |  |  |  | 8
Tax due to adoption of CARES Act |  |  |  |  | $ 5
Minimum | Internal Revenue Service | 2018 Tax Year |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized income tax expense due to change in tax regulations | $ 180 |  |  |  |
Maximum | Internal Revenue Service | 2018 Tax Year |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized income tax expense due to change in tax regulations | $ 220 |  |  |  |

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- Definition Effective Income Tax Rate Reconciliation, Coronavirus Aid, Relief, and Economic Security Act, Amount + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + 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=121826272&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120384911&loc=d3e23163-113944 + Details
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