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v3.21.2

Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Earnings | $ 19 | $ 21 | $ (8) | $ 27 | $ 36 | $ (194) | $ 32 | $ (131) |
Joint Ventures [Member] | Other Assets [Member] |  |  |  |  |  |  |  |  |
Investment balance | 6 |  |  |  |  |  | 6 |  | $ 9
Joint Ventures [Member] | Investment Income and Other, Net [Member] |  |  |  |  |  |  |  |  |
Earnings | $ 1 |  |  | $ 5 |  |  | $ 3 | $ 12 |

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