Condensed financial information of the parent company - Additional information (Details) € in Millions, $ in Millions |
12 Months Ended | ||||
|---|---|---|---|---|---|
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
USD ($)
|
Dec. 31, 2023
USD ($)
|
Dec. 31, 2025
EUR (€)
|
Dec. 31, 2024
EUR (€)
|
|
| Condensed Financial Statements, Captions [Line Items] | |||||
| Issue of contingent convertible capital securities | $ 1,014 | $ 982 | $ 864 | ||
| Parent company | |||||
| Condensed Financial Statements, Captions [Line Items] | |||||
| Number of debentures held | € | € 25 | € 10 | |||
| Perpetual additional tier 1 contingent capital securities | |||||
| Condensed Financial Statements, Captions [Line Items] | |||||
| Issued capital | $ 9,000 | $ 8,750 | $ 7,750 | ||