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Stock-Based Compensation (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 4 | $ 6 | $ 6 | $ 18
Stock-based compensation expense (net of tax) | $ 3 | $ 5 | $ 4 | $ 14
Senior Notes [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | July 2027 |
Ten and One over Two Euro-Denominated Senior Notes | Senior Notes [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | May 2025 |

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