v3.26.1
Fair values of financial instruments carried at fair value - Quantitative information about significant unobservable inputs in Level 3 valuations (Details) - Level 3
Dec. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Minimum | Price | Market proxy | – bonds      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage 0   0
Minimum | Price | Market proxy | Loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage 0   0
Minimum | Price | Market proxy | – bonds      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage 0   0
Minimum | Price | Market proxy | Loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage 0   0
Maximum | Price | Market proxy | – bonds      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage 105   3,342
Maximum | Price | Market proxy | Loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage 113   112
Maximum | Price | Market proxy | – bonds      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage 105   3,342
Maximum | Price | Market proxy | Loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage 113   112
Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   $ 35,969,000,000 $ 36,445,000,000
Financial liabilities   17,218,000,000 14,242,000,000
Recurring fair value measurement | Private equity including strategic investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   20,677,000,000 20,960,000,000
Recurring fair value measurement | – equity-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   0  
Recurring fair value measurement | Structured notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   0 0
Recurring fair value measurement | – foreign exchange-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   0  
Recurring fair value measurement | – other structured notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   0  
Recurring fair value measurement | Derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   2,046,000,000 2,183,000,000
Recurring fair value measurement | – bonds      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   6,744,000,000  
Recurring fair value measurement | Loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   4,046,000,000 3,253,000,000
Recurring fair value measurement | – other      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   2,456,000,000  
Recurring fair value measurement | Private equity including strategic investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   1,000,000 1,000,000
Recurring fair value measurement | Structured notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   13,281,000,000 10,617,000,000
Recurring fair value measurement | – equity-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   9,456,000,000  
Recurring fair value measurement | – foreign exchange-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   577,000,000  
Recurring fair value measurement | – other structured notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   3,248,000,000  
Recurring fair value measurement | Other derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   3,668,000,000 3,442,000,000
Recurring fair value measurement | – bonds      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   5,000,000  
Recurring fair value measurement | Loans      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   4,000,000 $ 11,000,000
Recurring fair value measurement | – other      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   259,000,000  
Recurring fair value measurement | Interest rate | – interest rate derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   628,000,000  
Recurring fair value measurement | Interest rate | securitisation swaps      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   100,000,000  
Recurring fair value measurement | Interest rate | long-dated swaptions      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   4,000,000  
Recurring fair value measurement | Interest rate | other      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   524,000,000  
Recurring fair value measurement | Interest rate | – interest rate derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   886,000,000  
Recurring fair value measurement | Interest rate | securitisation swaps      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   263,000,000  
Recurring fair value measurement | Interest rate | long-dated swaptions      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   3,000,000  
Recurring fair value measurement | Interest rate | – other      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   620,000,000  
Recurring fair value measurement | Foreign exchange | other      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   299,000,000  
Recurring fair value measurement | Foreign exchange | – foreign exchange derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   661,000,000  
Recurring fair value measurement | Foreign exchange | foreign exchange options      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   362,000,000  
Recurring fair value measurement | Foreign exchange | – other      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   255,000,000  
Recurring fair value measurement | Foreign exchange | – foreign exchange derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   595,000,000  
Recurring fair value measurement | Foreign exchange | foreign exchange options      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   340,000,000  
Recurring fair value measurement | Equities | other      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   562,000,000  
Recurring fair value measurement | Equities | – equity derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   597,000,000  
Recurring fair value measurement | Equities | long-dated single stock options      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   35,000,000  
Recurring fair value measurement | Equities | – other      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   1,319,000,000  
Recurring fair value measurement | Equities | – equity derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   1,830,000,000  
Recurring fair value measurement | Equities | long-dated single stock options      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   511,000,000  
Recurring fair value measurement | Credit | other      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   75,000,000  
Recurring fair value measurement | Credit | – credit derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   135,000,000  
Recurring fair value measurement | Credit | total return swaps      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   60,000,000  
Recurring fair value measurement | Credit | – other      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   65,000,000  
Recurring fair value measurement | Credit | Credit Derivative Liabilities      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   349,000,000  
Recurring fair value measurement | Credit | total return swaps      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   284,000,000  
Recurring fair value measurement | Other risk | other      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets   25,000,000  
Recurring fair value measurement | Other risk | – other      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial liabilities   $ 8,000,000  
Recurring fair value measurement | Minimum | Current Value/Cost | Price – Net asset value | Private equity including strategic investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   0 0
Recurring fair value measurement | Minimum | Current Value/Cost | Price – Net asset value | Private equity including strategic investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   0 0
Recurring fair value measurement | Minimum | Equity volatility | Model – Option model | – equity-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   0.05 0.05
Recurring fair value measurement | Minimum | Equity volatility | Model – Option model | – equity-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   0.05 0.05
Recurring fair value measurement | Minimum | Equity volatility | Model – Option model | Equities | long-dated single stock options      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   0.05 0.05
Recurring fair value measurement | Minimum | Equity volatility | Model – Option model | Equities | long-dated single stock options      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   0.05 0.05
Recurring fair value measurement | Minimum | Equity correlation | Model – Option model | – equity-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   0.10 0.10
Recurring fair value measurement | Minimum | Equity correlation | Model – Option model | – equity-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   0.10 0.10
Recurring fair value measurement | Minimum | FX volatility | Model – Option model | – foreign exchange-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   0.04 0.03
Recurring fair value measurement | Minimum | FX volatility | Model – Option model | Foreign exchange | foreign exchange options      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   0 0
Recurring fair value measurement | Minimum | FX volatility | Model – Option model | Foreign exchange | foreign exchange options      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   0 0
Recurring fair value measurement | Minimum | Prepayment rate | Model – Discounted cash flow | Interest rate | securitisation swaps      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   0.05 0.05
Recurring fair value measurement | Minimum | Prepayment rate | Model – Discounted cash flow | Interest rate | securitisation swaps      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   0.05 0.05
Recurring fair value measurement | Minimum | Interest rate volatility | Model – Option model | Interest rate | long-dated swaptions      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   0.08 0.05
Recurring fair value measurement | Minimum | Interest rate volatility | Model – Option model | Interest rate | long-dated swaptions      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   0.08 0.05
Recurring fair value measurement | Minimum | Price | Market proxy | Credit | total return swaps      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   66 68
Recurring fair value measurement | Minimum | Price | Market proxy | Credit | total return swaps      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   66 68
Recurring fair value measurement | Maximum | Current Value/Cost | Price – Net asset value | Private equity including strategic investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   34 75
Recurring fair value measurement | Maximum | Current Value/Cost | Price – Net asset value | Private equity including strategic investments      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   34 75
Recurring fair value measurement | Maximum | Equity volatility | Model – Option model | – equity-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   1.74 1.32
Recurring fair value measurement | Maximum | Equity volatility | Model – Option model | – equity-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   1.74 1.32
Recurring fair value measurement | Maximum | Equity volatility | Model – Option model | Equities | long-dated single stock options      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   1.19 1
Recurring fair value measurement | Maximum | Equity volatility | Model – Option model | Equities | long-dated single stock options      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   1.19 1
Recurring fair value measurement | Maximum | Equity correlation | Model – Option model | – equity-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   1 1
Recurring fair value measurement | Maximum | Equity correlation | Model – Option model | – equity-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   1 1
Recurring fair value measurement | Maximum | FX volatility | Model – Option model | – foreign exchange-linked notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   0.51 0.56
Recurring fair value measurement | Maximum | FX volatility | Model – Option model | Foreign exchange | foreign exchange options      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   0.28 0.22
Recurring fair value measurement | Maximum | FX volatility | Model – Option model | Foreign exchange | foreign exchange options      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   0.28 0.22
Recurring fair value measurement | Maximum | Prepayment rate | Model – Discounted cash flow | Interest rate | securitisation swaps      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   0.10 0.10
Recurring fair value measurement | Maximum | Prepayment rate | Model – Discounted cash flow | Interest rate | securitisation swaps      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   0.10 0.10
Recurring fair value measurement | Maximum | Interest rate volatility | Model – Option model | Interest rate | long-dated swaptions      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   0.23 0.20
Recurring fair value measurement | Maximum | Interest rate volatility | Model – Option model | Interest rate | long-dated swaptions      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   0.23 0.20
Recurring fair value measurement | Maximum | Price | Market proxy | Credit | total return swaps      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, assets, percentage   100 102
Recurring fair value measurement | Maximum | Price | Market proxy | Credit | total return swaps      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Significant unobservable input, liabilities, percentage   100 102