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Capital structure and noncontrolling interests - Summary of Noncontrolling Interests (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
Equity, Attributable to Noncontrolling Interest [Roll Forward]            
Balance, beginning of period   $ 622     $ 622  
Contributions from noncontrolling interests       $ 5    
Distributions $ (12) (12) $ (12) (12)    
Stock-based compensation 6 5 6 5    
Other comprehensive income (loss) (25) (71) 39 (9)    
Expiration of redemption option   92        
Redemption of units issued as stock compensation       (10)    
Net income (loss) (80) (48) (8) 19 (128) $ 11
Balance, end of period 614       614  
Noncontrolling interests            
Equity, Attributable to Noncontrolling Interest [Roll Forward]            
Balance, beginning of period 630 622 651 641 622 641
Contributions from noncontrolling interests       2    
Distributions (12) (12) (12) (12)    
Stock-based compensation 2 2 2 2    
Other comprehensive income (loss) (3) (8) 4 (1)    
Expiration of redemption option   27        
Redemption of units issued as stock compensation       (1)    
Net income (loss) (12) (8) (3) 1    
Reallocation of noncontrolling interests 9 7 11 19    
Balance, end of period 614 630 653 651 614 653
Noncontrolling Interest, Operating Partnership Units            
Equity, Attributable to Noncontrolling Interest [Roll Forward]            
Balance, beginning of period 608 598 618 608 598 608
Contributions from noncontrolling interests       2    
Distributions (12) (11) (12) (12)    
Stock-based compensation 0 0 0 0    
Other comprehensive income (loss) (3) (8) 4 (1)    
Expiration of redemption option   27        
Redemption of units issued as stock compensation       0    
Net income (loss) (8) (5) 0 2    
Reallocation of noncontrolling interests 9 7 11 19    
Balance, end of period 594 608 621 618 594 621
Noncontrolling Interest, Other Consolidated Subsidiaries            
Equity, Attributable to Noncontrolling Interest [Roll Forward]            
Balance, beginning of period 15 15 21 21 15 21
Contributions from noncontrolling interests       0    
Distributions 0 (1) 0 0    
Stock-based compensation 0 0 0 0    
Other comprehensive income (loss) 0 0 0 0    
Expiration of redemption option   0        
Redemption of units issued as stock compensation       0    
Net income (loss) 0 1 (1) 0    
Reallocation of noncontrolling interests 0 0 0 0    
Balance, end of period 15 15 20 21 15 20
Noncontrolling Interest, Management Profits Interests Units            
Equity, Attributable to Noncontrolling Interest [Roll Forward]            
Balance, beginning of period 7 9 12 12 9 12
Contributions from noncontrolling interests       0    
Distributions 0 0 0 0    
Stock-based compensation 2 2 2 2    
Other comprehensive income (loss) 0 0 0 0    
Expiration of redemption option   0        
Redemption of units issued as stock compensation       (1)    
Net income (loss) (4) (4) (2) (1)    
Reallocation of noncontrolling interests 0 0 0 0    
Balance, end of period $ 5 $ 7 $ 12 $ 12 $ 5 $ 12