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Employee Benefit Plans - Contributions and Benefit Payments (Details) - Dec. 31, 2021
£ in Millions, $ in Millions
USD ($)
GBP (£)
Other Postretirement    
Expected future benefit payments    
2022 $ 54  
2023 54  
2024 54  
2025 53  
2026 51  
2027-2031 229  
United States | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit payments 13  
Expected future benefit payments    
2022 210  
2023 203  
2024 195  
2025 193  
2026 193  
2027-2031 837  
United States | Other Postretirement    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit payments 5  
United Kingdom | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit payments | £   £ 12
Expected future benefit payments    
2022 73  
2023 75  
2024 77  
2025 79  
2026 81  
2027-2031 $ 436