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Commitments And Contingencies (Narrative) (Detail) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 case | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
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 |  | 4,100 |
Purchase commitment period decrease |  | 4,600 |
Other receivables |  | 145 | $ 357
Realogy |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Other receivables |  | 26 |
Wyndham |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Other receivables |  | $ 15 |

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