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Accounting for Derivative Instruments and Hedging Activities (Details)
£ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
GBP (£)
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Gain (Loss) On Financial Instruments, Net              
Change in fair value of cross-currency derivative instruments $ (72) $ 13 $ 39 $ (16)      
Foreign currency remeasurement of Sterling Notes to U.S. dollars 37 (92) (119) (81)      
Loss on financial instruments, net $ (35) $ (79) $ (80) $ (97)      
Cross Currency Derivatives              
Derivatives:              
Notional amount | £         £ 1,275    
Level 2 | Cross Currency Derivatives              
Derivatives:              
Derivative Liability, Statement of Financial Position [Extensible Enumeration]         OTHER LONG-TERM LIABILITIES OTHER LONG-TERM LIABILITIES OTHER LONG-TERM LIABILITIES
Derivative Liability           $ 465 $ 504