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Accounting for Derivative Instruments and Hedging Activities (Details)
£ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
GBP (£)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Gain (Loss) On Financial Instruments, Net              
Change in fair value of cross-currency derivative instruments $ (9) $ 43 $ (29) $ 48      
Foreign currency remeasurement of Sterling Notes to U.S. dollars (5) (46) 11 (78)      
Loss on financial instruments, net $ (14) $ (3) $ (18) $ (30)      
Cross Currency Derivatives              
Derivatives:              
Notional amount | £         £ 1,275    
Level 2 | Cross Currency Derivatives              
Derivatives:              
Derivative Liability           $ 469 $ 440