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Redeemable noncontrolling interest - Schedule of Noncontrolling Redeemable Equity Interest (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Increase (Decrease) in Temporary Equity [Roll Forward]      
Beginning Balance $ 333 $ 308 $ 336
Net income attributable to redeemable noncontrolling interests 28 28 27
Acquisitions 12    
Adjustment to the redemption value 34 24 (40)
Dividends paid (23) (27) (15)
Ending Balance $ 384 $ 333 $ 308