v3.26.1
Stock-based compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Stock-based compensation expense (reversal of expense) $ 23 $ 29 $ 53 $ 69
Time-Based Restricted Stock Unit Awards        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards granted (in shares)     1,058,843  
Stock-based compensation expense (reversal of expense) 16 19 $ 31 35
Unrecognized noncash compensation cost 88   $ 88  
Unrecognized noncash compensation cost, weighted-average period to be recognized     1 year 4 months 24 days  
Time-Based Restricted Stock Units, Executive, Corporate, And Operations Leaders Grants        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards granted (in shares)     1,040,883  
Award vesting period (in years)     3 years  
Awards granted fair value 34   $ 34  
Time-Based Restricted Stock Units, Board Member Grants        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards granted (in shares)     17,960  
Award vesting period (in years)     1 year  
Awards granted fair value 1   $ 1  
Performance-Based Restricted Stock Unit Awards        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards granted (in shares)     320,195  
Stock-based compensation expense (reversal of expense) (2) 3 $ 0 5
Unrecognized noncash compensation cost 10   $ 10  
Unrecognized noncash compensation cost, weighted-average period to be recognized     1 year  
Performance-Based Restricted Stock Unit Awards | Scenario, Adjustment        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Stock-based compensation expense (reversal of expense) (5)      
Performance-Based Restricted Stock Units, Executive, Corporate, And Operations Leaders Grants, One Year Vesting Period        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards granted (in shares)     245,072  
Award vesting period (in years)     1 year  
Awards granted fair value 10   $ 10  
Performance-Based Restricted Stock Units, Executive, Corporate, And Operations Leaders Grants, Three Years Vesting Period        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards granted (in shares)     75,123  
Award vesting period (in years)     3 years  
Awards granted fair value 3   $ 3  
Time-Based Long-Term Incentive Plant (LTIP) Awards        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards granted (in shares)     211,109  
Stock-based compensation expense (reversal of expense) 11 9 $ 20 23
Unrecognized noncash compensation cost 39   $ 39  
Unrecognized noncash compensation cost, weighted-average period to be recognized     10 months 24 days  
Time-Based Long-Term Incentive Plan (LTIP) Awards, Annual Employee Grants, Three Years Vesting Period        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards granted (in shares)     147,472  
Award vesting period (in years)     3 years  
Awards granted fair value 5   $ 5  
Time-Based Long-Term Incentive Plan (LTIP) Awards, Executive, Corporate, And Operations Leaders Grants, One Year Vesting Period        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards granted (in shares)     63,637  
Award vesting period (in years)     1 year  
Awards granted fair value 2   $ 2  
Performance-Based Long-Term Incentive Plan (LTIP) Awards        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards granted (in shares)     463,375  
Stock-based compensation expense (reversal of expense) (2) $ (2) $ 2 $ 6
Unrecognized noncash compensation cost 11   $ 11  
Unrecognized noncash compensation cost, weighted-average period to be recognized     1 year 2 months 12 days  
Performance-Based Long-Term Incentive Plan (LTIP) Awards | Scenario, Adjustment        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Stock-based compensation expense (reversal of expense) (5)      
Performance-Based Long-Term Incentive Plan (LTIP) Awards, Executive, Corporate, And Operations Leaders Grants, Three Years Vesting Period        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards granted (in shares)     239,056  
Award vesting period (in years)     3 years  
Awards granted fair value 8   $ 8  
Performance-Based Long-Term Incentive Plan (LTIP) Awards, Executive, Corporate, And Operations Leaders Grants, One Year Vesting Period        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards granted (in shares)     224,319  
Award vesting period (in years)     1 year  
Awards granted fair value $ 7   $ 7