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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, 2021 USD ($) Claim | Dec. 31, 2020 USD ($) | [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 ($) | [1] | Dec. 31, 2012 USD ($) | [1]
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Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of reinsurance | $ 2,440 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance | 2,368 |  |  |  |  |  |  |  |  |
All outstanding liabilities before 2012, net of reinsurance | 0 |  |  |  |  |  |  |  |  |
Liabilities for claims and claims adjustment expenses, net of reinsurance | 72 |  |  |  |  |  |  |  |  |
Accident Year 2012 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of reinsurance | 162 | $ 162 | $ 162 | $ 162 | $ 161 | $ 161 | $ 161 | $ 160 | $ 159 | $ 157
Total of IBNR liabilities plus expected development on reported claims | $ 0 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 0.7 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance | $ 162 | 162 | 162 | 161 | 160 | 160 | 159 | 157 | 154 | $ 131
Accident Year 2013 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of reinsurance | 185 | 185 | 185 | 185 | 185 | 185 | 185 | 184 | 183 |
Total of IBNR liabilities plus expected development on reported claims | $ 0 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 0.8 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance | $ 185 | 185 | 185 | 185 | 184 | 184 | 183 | 180 | $ 151 |
Accident Year 2014 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of reinsurance | 191 | 191 | 191 | 191 | 191 | 191 | 191 | 191 |  |
Total of IBNR liabilities plus expected development on reported claims | $ 0 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 0.8 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance | $ 191 | 191 | 191 | 190 | 190 | 188 | 186 | $ 157 |  |
Accident Year 2015 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of reinsurance | 227 | 227 | 227 | 227 | 226 | 226 | 222 |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ 0 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 0.9 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance | $ 226 | 226 | 226 | 225 | 223 | 218 | $ 181 |  |  |
Accident Year 2016 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of reinsurance | 253 | 254 | 253 | 252 | 249 | 246 |  |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ 0 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.0 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance | $ 253 | 252 | 251 | 248 | 243 | $ 206 |  |  |  |
Accident Year 2017 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of reinsurance | 279 | 279 | 278 | 275 | 267 |  |  |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ 0 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.0 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance | $ 275 | 272 | 271 | 267 | $ 220 |  |  |  |  |
Accident Year 2018 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of reinsurance | 267 | 270 | 269 | 264 |  |  |  |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ 1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.1 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance | $ 264 | 262 | 256 | $ 223 |  |  |  |  |  |
Accident Year 2019 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of reinsurance | 266 | 268 | 251 |  |  |  |  |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ 4 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.1 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance | $ 259 | 252 | $ 207 |  |  |  |  |  |  |
Accident Year 2020 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of reinsurance | 303 | 293 |  |  |  |  |  |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ 5 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.2 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance | $ 293 | $ 243 |  |  |  |  |  |  |  |
Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of reinsurance | 307 |  |  |  |  |  |  |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ 16 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.2 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance | $ 260 |  |  |  |  |  |  |  |  |
[1] | *Amounts unaudited.

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