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Accounting for Derivative Instruments and Hedging Activities (Details) £ in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 GBP (£)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Gain (Loss) On Financial Instruments, Net
Change in fair value of cross-currency derivative instruments	$ 13	$ 6	$ (16)	$ 54
Foreign currency remeasurement of Sterling Notes to U.S. dollars	(92)	64	(81)	(14)
Gain (loss) on financial instruments, net	$ (79)	$ 70	$ (97)	$ 40
Cross Currency Derivatives
Derivatives:
Notional amount | £					£ 1,275
Level 2 | Cross Currency Derivatives
Derivatives:
Derivative Liability						$ 456	$ 440

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