v3.26.1
Financial Risks - Summary of Economic Variable Assumptions (Detail)
Jun. 30, 2026
USD ($)
Jun. 30, 2026
EUR (€)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
EUR (€)
Base [member] | Later than one year [member]        
Economic variable assumptions [line items]        
Interest rates 4.36% 4.36% 4.29% 4.29%
Unemployment rate 4.66% 4.66% 4.78% 4.78%
House Price Index 428.56 428.56 429.08 429.08
Domestic GDP | $ $ 25,024.3   $ 24,484.94  
Equity | €   € 6,961.56   € 6,363.3
Base [member] | Later than one year and not later than two years [member]        
Economic variable assumptions [line items]        
Interest rates 4.42% 4.42% 4.32% 4.32%
Unemployment rate 4.55% 4.55% 4.59% 4.59%
House Price Index 443.35 443.35 438.87 438.87
Domestic GDP | $ $ 25,583.91   $ 24,932.78  
Equity | €   € 7,398.77   € 6,460.73
Base [member] | Later than two years and not later than three years [member]        
Economic variable assumptions [line items]        
Interest rates 4.48% 4.48% 4.33% 4.33%
Unemployment rate 4.50% 4.50% 4.29% 4.29%
House Price Index 458.07 458.07 455.2 455.2
Domestic GDP | $ $ 26,262.97   $ 25,485.1  
Equity | €   € 8,012.41   € 6,953.76
Base [member] | Later than three years and not later than four years [member]        
Economic variable assumptions [line items]        
Interest rates 4.47% 4.47% 4.30% 4.30%
Unemployment rate 4.57% 4.57% 4.05% 4.05%
House Price Index 473.14 473.14 471.22 471.22
Domestic GDP | $ $ 26,971.68   $ 26,129.71  
Equity | €   € 8,622.3   € 7,485.28
Upside [member] | Later than one year [member]        
Economic variable assumptions [line items]        
Interest rates 4.44% 4.44% 4.39% 4.39%
Unemployment rate 3.78% 3.78% 3.83% 3.83%
House Price Index 460.16 460.16 450.23 450.23
Domestic GDP | $ $ 25,406.74   $ 24,887.2  
Equity | €   € 7,413.18   € 6,831.53
Upside [member] | Later than one year and not later than two years [member]        
Economic variable assumptions [line items]        
Interest rates 4.42% 4.42% 4.41% 4.41%
Unemployment rate 3.96% 3.96% 3.94% 3.94%
House Price Index 476.97 476.97 472.07 472.07
Domestic GDP | $ $ 26,029.13   $ 25,401.41  
Equity | €   € 7,927.83   € 6,904.3
Upside [member] | Later than two years and not later than three years [member]        
Economic variable assumptions [line items]        
Interest rates 4.47% 4.47% 4.33% 4.33%
Unemployment rate 3.86% 3.86% 3.66% 3.66%
House Price Index 498.41 498.41 494.28 494.28
Domestic GDP | $ $ 26,745.05   $ 26,012.56  
Equity | €   € 8,354.24   € 7,343.79
Upside [member] | Later than three years and not later than four years [member]        
Economic variable assumptions [line items]        
Interest rates 4.47% 4.47% 4.30% 4.30%
Unemployment rate 4.02% 4.02% 3.47% 3.47%
House Price Index 517.39 517.39 513.52 513.52
Domestic GDP | $ $ 27,453.89   $ 26,724.26  
Equity | €   € 8,935.02   € 7,756.76
Downside [member] | Later than one year [member]        
Economic variable assumptions [line items]        
Interest rates 3.50% 3.50% 3.05% 3.05%
Unemployment rate 8.40% 8.40% 8.34% 8.34%
House Price Index 366.03 366.03 362.72 362.72
Domestic GDP | $ $ 23,846.24   $ 23,372.8  
Equity | €   € 4,985.49   € 4,423.87
Downside [member] | Later than one year and not later than two years [member]        
Economic variable assumptions [line items]        
Interest rates 4.00% 4.00% 3.76% 3.76%
Unemployment rate 6.99% 6.99% 7.60% 7.60%
House Price Index 390.94 390.94 383.66 383.66
Domestic GDP | $ $ 24,371.64   $ 23,689.06  
Equity | €   € 5,672.73   € 4,764.13
Downside [member] | Later than two years and not later than three years [member]        
Economic variable assumptions [line items]        
Interest rates 4.27% 4.27% 4.02% 4.02%
Unemployment rate 5.87% 5.87% 6.16% 6.16%
House Price Index 408.61 408.61 404.1 404.1
Domestic GDP | $ $ 25,277.17   $ 24,425.29  
Equity | €   € 6,935.66   € 5,780.16
Downside [member] | Later than three years and not later than four years [member]        
Economic variable assumptions [line items]        
Interest rates 4.40% 4.40% 4.16% 4.16%
Unemployment rate 5.04% 5.04% 4.94% 4.94%
House Price Index 421.48 421.48 420.99 420.99
Domestic GDP | $ $ 26,086.79   $ 25,270.54  
Equity | €   € 7,861.56   € 6,786.08