v3.26.1
Financial Risks - Summary of Economic Variable Assumptions (Detail)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
EUR (€)
Base [member] | Later than one year [member]        
Economic variable assumptions [line items]        
Interest rates 4.29% 4.29% 4.33% 4.33%
Unemployment rate 4.78% 4.78% 4.08% 4.08%
House Price Index 429.08 429.08 419.04 419.04
Domestic GDP | $ $ 24,484.94   $ 23,973.45  
Equity | €   € 6,363.3   € 5,912.89
Base [member] | Later than one year and not later than two years [member]        
Economic variable assumptions [line items]        
Interest rates 4.32% 4.32% 4.26% 4.26%
Unemployment rate 4.59% 4.59% 4.09% 4.09%
House Price Index 438.87 438.87 424.1 424.1
Domestic GDP | $ $ 24,932.78   $ 24,343.12  
Equity | €   € 6,460.73   € 5,814.62
Base [member] | Later than two years and not later than three years [member]        
Economic variable assumptions [line items]        
Interest rates 4.33% 4.33% 4.24% 4.24%
Unemployment rate 4.29% 4.29% 4.05% 4.05%
House Price Index 455.2 455.2 434.08 434.08
Domestic GDP | $ $ 25,485.1   $ 24,819.66  
Equity | €   € 6,953.76   € 6,098.72
Base [member] | Later than three years and not later than four years [member]        
Economic variable assumptions [line items]        
Interest rates 4.30% 4.30% 4.18% 4.18%
Unemployment rate 4.05% 4.05% 4.01% 4.01%
House Price Index 471.22 471.22 448.91 448.91
Domestic GDP | $ $ 26,129.71   $ 25,356.09  
Equity | €   € 7,485.28   € 6,483.85
Upside [member] | Later than one year [member]        
Economic variable assumptions [line items]        
Interest rates 4.39% 4.39% 4.43% 4.43%
Unemployment rate 3.83% 3.83% 3.13% 3.13%
House Price Index 450.23 450.23 439.72 439.72
Domestic GDP | $ $ 24,887.2   $ 24,319.86  
Equity | €   € 6,831.53   € 6,264.59
Upside [member] | Later than one year and not later than two years [member]        
Economic variable assumptions [line items]        
Interest rates 4.41% 4.41% 4.35% 4.35%
Unemployment rate 3.94% 3.94% 3.44% 3.44%
House Price Index 472.07 472.07 456.26 456.26
Domestic GDP | $ $ 25,401.41   $ 24,807.47  
Equity | €   € 6,904.3   € 6,132.21
Upside [member] | Later than two years and not later than three years [member]        
Economic variable assumptions [line items]        
Interest rates 4.33% 4.33% 4.24% 4.24%
Unemployment rate 3.66% 3.66% 3.42% 3.42%
House Price Index 494.28 494.28 471.39 471.39
Domestic GDP | $ $ 26,012.56   $ 25,341.29  
Equity | €   € 7,343.79   € 6,356.19
Upside [member] | Later than three years and not later than four years [member]        
Economic variable assumptions [line items]        
Interest rates 4.30% 4.30% 4.18% 4.18%
Unemployment rate 3.47% 3.47% 3.42% 3.42%
House Price Index 513.52 513.52 489.21 489.21
Domestic GDP | $ $ 26,724.26   $ 25,943.15  
Equity | €   € 7,756.76   € 6,630.75
Downside [member] | Later than one year [member]        
Economic variable assumptions [line items]        
Interest rates 3.05% 3.05% 3.17% 3.17%
Unemployment rate 8.34% 8.34% 8.23% 8.23%
House Price Index 362.72 362.72 354.16 354.16
Domestic GDP | $ $ 23,372.8   $ 22,959.57  
Equity | €   € 4,423.87   € 3,867.82
Downside [member] | Later than one year and not later than two years [member]        
Economic variable assumptions [line items]        
Interest rates 3.76% 3.76% 3.74% 3.74%
Unemployment rate 7.60% 7.60% 7.46% 7.46%
House Price Index 383.66 383.66 369.92 369.92
Domestic GDP | $ $ 23,689.06   $ 23,369.09  
Equity | €   € 4,764.13   € 4,095.95
Downside [member] | Later than two years and not later than three years [member]        
Economic variable assumptions [line items]        
Interest rates 4.02% 4.02% 3.94% 3.94%
Unemployment rate 6.16% 6.16% 6.18% 6.18%
House Price Index 404.1 404.1 385.26 385.26
Domestic GDP | $ $ 24,425.29   $ 24,147.35  
Equity | €   € 5,780.16   € 4,899.05
Downside [member] | Later than three years and not later than four years [member]        
Economic variable assumptions [line items]        
Interest rates 4.16% 4.16% 4.04% 4.04%
Unemployment rate 4.94% 4.94% 5.00% 5.00%
House Price Index 420.99 420.99 401.39 401.39
Domestic GDP | $ $ 25,270.54   $ 24,980.66  
Equity | €   € 6,786.08   € 5,712.91