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Accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Balance, beginning of period $ 5,608 $ 5,673 $ 5,931 $ 5,809 $ 5,673 $ 5,809
Other comprehensive income (loss) (25) (71) 39 (9)    
Balance, end of period 5,492 5,608 5,949 5,931 5,492 5,949
Accumulated other comprehensive income (loss)            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Balance, beginning of period (97) (34) (43) (37) (34) (37)
Other comprehensive income (loss) (22) (63) 35 (8)    
Balance, end of period (119) (97) (8) (43) (119) (8)
Foreign currency translation adjustments            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Balance, beginning of period (210) (149) (196) (227) (149) (227)
Other comprehensive income (loss) (12)   19   (86) 49
Amounts allocated to Noncontrolling interests and Redeemable noncontrolling interests 2   (2)   10 (5)
Reallocation due to change in Noncontrolling interest ownership percentage 1   (1)   6 3
Balance, end of period (219) (210) (180) (196) (219) (180)
Derivatives            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Balance, beginning of period 113 115 153 190 115 190
Unrealized gain (loss) on foreign currency hedges 10   50   39 34
Net amount reclassified from AOCI to net income (loss) (23)   (29)   (49) (54)
Tax effect 0   (1)   0 1
Amounts allocated to Noncontrolling interests and Redeemable noncontrolling interests 1   (2)   1 2
Reallocation due to change in Noncontrolling interest ownership percentage (1)   1   (6) (1)
Balance, end of period $ 100 $ 113 $ 172 $ 153 $ 100 $ 172