v3.26.1
Fair value measurement (Details)
$ in Millions
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Minimum | Measurement input, discount rate      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Redeemable noncontrolling interest, measurement input 0.0622    
Maximum | Measurement input, discount rate      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Redeemable noncontrolling interest, measurement input 0.0726    
Carrying value      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt instrument, fair value disclosure $ 17,821 $ 17,533 $ 15,706
Fair value      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt instrument, fair value disclosure $ 17,608 $ 17,502 $ 15,587