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Short Duration Contracts - Claims development - Mortgage (Details)
$ in Millions
Dec. 31, 2025
USD ($)
claims
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Claims Development [Line Items]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 23,906                  
Mortgage                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 721                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 419                  
All outstanding liabilities before 2012, net of reinsurance 9                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 311                  
Mortgage | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 136 $ 136 $ 136 $ 137 $ 142 $ 142 $ 141 $ 149 $ 171 $ 184
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 135 134 133 132 132 131 127 113 72 $ 11
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 3,564                  
Mortgage | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 97 99 99 102 109 108 107 132 179  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 95 95 93 92 90 87 79 48 $ 9  
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 2,723                  
Mortgage | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 66 69 69 72 88 89 96 132    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 64 63 60 59 56 50 31 $ 4    
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 1,990                  
Mortgage | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 48 52 51 63 110 119 108      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 44 42 39 34 29 20 $ 3      
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 1,491                  
Mortgage | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 26 31 33 78 374 420        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 21 19 13 8 4 $ 1        
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 904                  
Mortgage | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 13 17 20 77 144          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 10 8 5 2 $ 0          
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 443                  
Mortgage | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 22 30 55 173            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 14 10 3 $ 0            
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 604                  
Mortgage | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 36 71 182              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 18 7 $ 0              
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 727                  
Mortgage | 2024                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 86 180                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 16 $ 1                
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of paid claims | claims 509                  
Mortgage | 2025                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 191                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2                  
Total of IBNR liabilities plus expected development on reported claims $ 1                  
Cumulative number of paid claims | claims 87