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Pension and Other Postretirement Healthcare Benefits - Narrative (Details)
£ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
GBP (£)
plan
Dec. 31, 2025
USD ($)
plan
Dec. 31, 2024
USD ($)
Dec. 31, 2026
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Number of plans | plan 1 1    
Defined benefit plan, plan assets, increase (decrease) for assets transferred to (from) plan £ 30 $ 40    
Pensions        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   $ 4    
Pensions | Forecast        
Defined Benefit Plan Disclosure [Line Items]        
Contributions expected in the next year       $ 10
Pensions | Retirement Plan Name, Other        
Defined Benefit Plan Disclosure [Line Items]        
Required employer contribution percentage 19.80% 19.80%    
Pensions | International        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   $ 3 $ 5  
Other Post Retirement Benefit Plans | International        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   $ 1 $ 1  
Other Post Retirement Benefit Plans | South Africa        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of post-retirement and death-in-service benefits for members employed before March 1, 1994 100.00% 100.00%    
Annual percentage of post-retirement and death-in-service benefits for members employed on or after March 1, 1994 but before January 1, 2002 2.00% 2.00%    
Percentage of post-retirement and death-in-service benefits for members employed on or after January 1, 2002 0.00% 0.00%    
Other Post Retirement Benefit Plans | South Africa | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of post-retirement and death-in-service benefits for members employed on or after March 1, 1994 but before January 1, 2002 50.00% 50.00%