Accounting for Derivative Instruments and Hedging Activities (Details) £ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 GBP (£)	Dec. 31, 2023 USD ($)
Gain (loss) on financial instruments, net:
Change in fair value of cross-currency derivative instruments	$ 130	$ (280)	$ (106)
Foreign currency remeasurement of Sterling Notes to U.S. dollars	(85)	185	20
Gain (loss) on financial instruments, net	$ 45	(95)	$ (86)
Cross Currency Derivatives
Derivatives:
Notional amount | £				£ 1,275
Level 2 | Cross Currency Derivatives
Derivatives:
Derivative Liability		$ 570			$ 440