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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Assumed combined federal, state, local and foreign effective income tax rate |  |  |  |  | 28.70% |  |  |  | 28.70% |
Impairment of goodwill | $ 203 |  |  |  |  |  |  | $ 197 | $ 12 |
Impairment charge to goodwill at business with ongoing operations |  |  |  |  |  |  |  | 193 |  |
Impairment charge to goodwill at business divested prior to current period |  |  |  |  |  |  |  | 4 |  |
Reversal of impairment of intangible assets |  | $ 5 |  |  |  |  |  |  |  |
Earnings |  | 27 | $ 36 | $ (194) | $ 12 | $ 53 | $ 21 | (131) | 86 |
Joint Ventures [Member] | Other Assets [Member] |  |  |  |  |  |  |  |  |  |
Investment balance |  | 10 |  |  |  |  |  | 10 |  | $ 6
Joint Ventures [Member] | Investment Income and Other, Net [Member] |  |  |  |  |  |  |  |  |  |
Earnings |  | $ 5 |  |  | $ 5 |  |  | $ 12 | $ 6 |
Asset Held For Sale [Member] |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets held for sale | $ 5 |  |  |  |  |  |  |  |  |

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