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Employee Benefit Plans - Contributions and Benefit Payments (Details) - Dec. 31, 2022
£ in Millions, $ in Millions
USD ($)
GBP (£)
Other Postretirement    
Expected future benefit payments    
2023 $ 53  
2024 53  
2025 53  
2026 52  
2027 52  
2028-2032 235  
U.S. | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit payments 13  
Expected future benefit payments    
2023 192  
2024 184  
2025 180  
2026 177  
2027 172  
2028-2032 782  
U.S. | Other Postretirement    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit payments 7  
United Kingdom | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit payments | £   £ 11
Expected future benefit payments    
2023 67  
2024 69  
2025 70  
2026 72  
2027 74  
2028-2032 $ 398