v3.25.4
Report of Directors Financial Review Risk Report - Trading/Non-trading VaR, 99% 1 Day (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Non-trading portfolios    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk $ 546.6 $ 553.8
Non-trading portfolios | Average    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 540.1 695.8
Non-trading portfolios | Maximum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 617.5 1,097.6
Non-trading portfolios | Minimum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 458.0 408.7
Non-trading portfolios | Interest rate    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 499.6 528.4
Non-trading portfolios | Interest rate | Average    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 465.2 603.7
Non-trading portfolios | Interest rate | Maximum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 575.3 1,000.6
Non-trading portfolios | Interest rate | Minimum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 378.9 292.1
Non-trading portfolios | Credit spread    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 149.6 246.1
Non-trading portfolios | Credit spread | Average    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 190.8 315.1
Non-trading portfolios | Credit spread | Maximum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 254.6 369.1
Non-trading portfolios | Credit spread | Minimum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 93.9 242.4
Non-trading portfolios | Portfolio diversification    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk (102.5) (220.7)
Non-trading portfolios | Portfolio diversification | Average    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk (115.8) (222.9)
Trading portfolios    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 38.9 38.3
Trading portfolios | Average    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 38.5 53.1
Trading portfolios | Maximum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 57.1 83.3
Trading portfolios | Minimum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 27.3 37.0
Trading portfolios | Foreign exchange and commodity    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 13.9 14.6
Trading portfolios | Foreign exchange and commodity | Average    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 13.6 15.2
Trading portfolios | Foreign exchange and commodity | Maximum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 26.9 29.8
Trading portfolios | Foreign exchange and commodity | Minimum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 6.2 6.9
Trading portfolios | Interest rate    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 18.9 34.9
Trading portfolios | Interest rate | Average    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 27.5 48.3
Trading portfolios | Interest rate | Maximum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 54.9 78.1
Trading portfolios | Interest rate | Minimum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 17.1 24.8
Trading portfolios | Equity    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 17.1 16.3
Trading portfolios | Equity | Average    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 16.3 14.8
Trading portfolios | Equity | Maximum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 24.6 20.5
Trading portfolios | Equity | Minimum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 12.3 12.7
Trading portfolios | Credit spread    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 8.5 8.2
Trading portfolios | Credit spread | Average    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 10.1 9.9
Trading portfolios | Credit spread | Maximum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 17.9 13.1
Trading portfolios | Credit spread | Minimum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk 6.4 6.6
Trading portfolios | Portfolio diversification    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk (19.5) (35.7)
Trading portfolios | Portfolio diversification | Average    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value at risk $ (29.1) $ (35.1)