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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]
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.