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Reserve for Known and Incurred but Not Reported Claims - Summary of Incurred and Paid Claims Development Net of Reinsurance (Detail) Claim in Millions, $ in Millions | Dec. 31, 2022 USD ($) Claim | Dec. 31, 2021 USD ($) | [1] | Dec. 31, 2020 USD ($) | [1] | Dec. 31, 2019 USD ($) | [1] | Dec. 31, 2018 USD ($) | [1] | Dec. 31, 2017 USD ($) | [1] | Dec. 31, 2016 USD ($) | [1] | Dec. 31, 2015 USD ($) | [1] | Dec. 31, 2014 USD ($) | [1] | Dec. 31, 2013 USD ($) | [1]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 1,712 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | 1,693 |  |  |  |  |  |  |  |  |
All outstanding liabilities before 2013 | 0 |  |  |  |  |  |  |  |  |
Liabilities for claims and claims adjustment expenses | 56 |  |  |  |  |  |  |  |  |
Home warranty |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Liabilities for claims and claims adjustment expenses | 19 |  |  |  |  |  |  |  |  |
Accident Year 2013 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 124 | $ 124 | $ 124 | $ 124 | $ 124 | $ 124 | $ 124 | $ 124 | $ 124 | $ 124
Cumulative number of reported claims | Claim | 0.7 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 124 | 124 | 124 | 124 | 124 | 124 | 124 | 124 | 124 | $ 111
Accident Year 2014 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 124 | 124 | 124 | 124 | 124 | 124 | 124 | 124 | 124 |
Cumulative number of reported claims | Claim | 0.8 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 124 | 124 | 124 | 124 | 124 | 124 | 124 | 124 | $ 111 |
Accident Year 2015 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 144 | 144 | 144 | 144 | 144 | 144 | 144 | 144 |  |
Cumulative number of reported claims | Claim | 0.9 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 144 | 144 | 144 | 144 | 144 | 144 | 144 | $ 129 |  |
Accident Year 2016 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 173 | 173 | 173 | 173 | 173 | 173 | 173 |  |  |
Cumulative number of reported claims | Claim | 1.0 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 173 | 173 | 173 | 173 | 173 | 173 | $ 155 |  |  |
Accident Year 2017 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 167 | 167 | 167 | 167 | 167 | 167 |  |  |  |
Cumulative number of reported claims | Claim | 1.0 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 167 | 167 | 167 | 167 | 167 | $ 151 |  |  |  |
Accident Year 2018 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 180 | 180 | 180 | 180 | 180 |  |  |  |  |
Cumulative number of reported claims | Claim | 1.1 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 180 | 180 | 180 | 180 | $ 163 |  |  |  |  |
Accident Year 2019 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 174 | 174 | 174 | 174 |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.1 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 174 | 174 | 174 | $ 159 |  |  |  |  |  |
Accident Year 2020 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 197 | 197 | 197 |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.2 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 197 | 197 | $ 178 |  |  |  |  |  |  |
Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 218 | 218 |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.2 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 218 | $ 199 |  |  |  |  |  |  |  |
Accident Year 2022 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 211 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.1 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 192 |  |  |  |  |  |  |  |  |
[1] | Amounts unaudited.

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