v3.26.1
Accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period $ 9,236 $ 9,651
Foreign currency translation adjustments (28) 47
Balance at end of period 9,055 9,605
Accumulated other comprehensive income (loss)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (97) (273)
Foreign currency translation adjustments (25) 42
Balance at end of period (122) (231)
Foreign currency translation adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (99) (330)
Foreign currency translation adjustments (33) 64
Amounts allocated to Noncontrolling interests and Redeemable noncontrolling interests 4 (6)
Balance at end of period (128) (272)
Derivatives    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period 2 57
Unrealized gain (loss) on interest rate hedges and foreign currency hedges 7 0
Net amount reclassified from AOCI to net income (loss) (2) (19)
Tax effect 0 1
Amounts allocated to Noncontrolling interests and Redeemable noncontrolling interests (1) 2
Balance at end of period $ 6 $ 41