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Commitments And Contingencies (Detail) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2017 case | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Number of cases brought by plaintiffs | case | 2 |  |  |  |
Liability net of recoverable insurance proceeds |  |  | $ 12 |  |
Range of possible loss (up to) |  | $ 35 |  |  |
Purchase obligation over the next twelve months |  | 5,900 |  |  |
Purchase commitment period decrease |  | 2,800 |  |  |
Aggregate purchase obligations |  | 149 |  |  |
Receivables due from former subsidiaries |  | 134 |  | $ 162 | $ 576
Liabilities accrued for asset retirement obligations |  | 28 |  | $ 30 |
Realogy |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Receivables due from former subsidiaries |  | 26 |  |  |
Wyndham |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Receivables due from former subsidiaries |  | $ 15 |  |  |

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