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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Line Items] |  |  |  |
Deferred income taxes |  | $ 103 | $ (14) | $ 192
Foreign net operating loss carryforwards |  | 981 |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | 4 | 3 | 0
Deferred Tax Liabilities, Undistributed Foreign Earnings |  | 811 |  |
Internal Revenue Service (IRS) |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Federal net operating loss carryforwards net of valuation allowances |  | $ 6,000 |  |
Provision adjustment due to corporate tax rate change [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred income taxes |  |  | $ (30) | (317)
Provision adjustment due to anticipated repatriation of foreign earnings [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred income taxes | $ (30) |  |  | $ (104)

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