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Short Duration Contracts - Claims development - Mortgage (Details)
$ in Millions
Dec. 31, 2023
USD ($)
claims
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Claims Development [Line Items]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 15,700                  
Mortgage                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,092                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 790                  
All outstanding liabilities before 2012, net of reinsurance 8                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 310                  
Mortgage | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 259 $ 261 $ 263 $ 263 $ 261 $ 266 $ 266 $ 279 $ 297 $ 316
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 258 257 257 256 254 247 234 202 129 $ 20
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 6,332                  
Mortgage | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 188 189 191 191 189 195 198 197 223  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 186 185 184 183 180 171 151 92 $ 16  
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 4,588                  
Mortgage | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 136 137 142 142 141 149 171 184    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 133 132 132 131 127 113 72 $ 11    
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 3,462                  
Mortgage | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 99 102 109 108 107 132 179      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 93 92 90 87 79 48 $ 9      
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 2,541                  
Mortgage | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 69 72 88 89 96 132        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 60 59 56 50 31 $ 4        
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 1,763                  
Mortgage | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 51 63 110 119 108          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 39 34 29 20 $ 3          
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 1,149                  
Mortgage | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 33 78 374 420            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 13 8 4 $ 1            
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 492                  
Mortgage | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 20 77 144              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 5 2 $ 0              
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 211                  
Mortgage | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 55 173                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3 $ 0                
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 135                  
Mortgage | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 182                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0                  
Total of IBNR liabilities plus expected development on reported claims $ 1                  
Cumulative number of paid claims | claims 9