Share based payments - Performance Stock Units PSUs (Details) $ in Millions |
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2026
USD ($)
shares
|
Jun. 30, 2025
USD ($)
|
|
| Disclosure of terms and conditions of share-based payment arrangement [line items] | ||
| Number of shares on conversion (in shares) | shares | 1 | |
| Total share based payment expense | $ | $ 52 | $ 55 |
| Performance stock units (PSUs) | ||
| Disclosure of terms and conditions of share-based payment arrangement [line items] | ||
| Number of shares on conversion (in shares) | shares | 1 | |
| Vesting period | 3 years | |
| Maximum upside payout percentage | 1.50 | |
| Total share based payment expense | $ | $ 6 | |