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Income Taxes - Additional Information Regarding Examinations (Detail) - USD ($) $ in Billions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Jun. 30, 2018 | Jun. 30, 2016 | Jun. 30, 2011
Earliest Tax Year | Foreign Country |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax years subject to examination |  | 1996 |  |  |
Latest Tax Year | Foreign Country |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax years subject to examination |  | 2020 |  |  |
Internal Revenue Service (IRS) |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Settlement payments including tax and interest | $ 1.7 |  |  |  |
Internal Revenue Service (IRS) | Earliest Tax Year |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax years under audit | 2004 |  | 2010 | 2007 | 2004
Tax years subject to examination |  | 2004 |  |  |
Internal Revenue Service (IRS) | Latest Tax Year |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax years under audit | 2013 |  | 2013 | 2009 | 2006
Tax years subject to examination |  | 2017 |  |  |

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